The energy retrofit of public buildings is an effective strategy to achieve carbon neutrality goals,with educational buildings representing a significant proportion of this sector.This paper presents an in-depth analy...The energy retrofit of public buildings is an effective strategy to achieve carbon neutrality goals,with educational buildings representing a significant proportion of this sector.This paper presents an in-depth analysis of energy retrofitting policies for educational buildings and examines the design case of the“Plus Energy School”demonstration project in Rostock,Germany.The study reveals innovative approaches in several key areas:overall layout optimization,creation of climate buffer zones,enhancement of building envelope performance,ventilation and heating system design,integration of diverse renewable energy sources,and formulation of energy balance schemes with corresponding calculations.The holistic theory and methodology of this energy strategy synergy offer valuable insights for the retrofitting of existing educational buildings in China.The project successfully transformed two aging school buildings into a single“plus energy”facility through coordinated architectural and technological interventions.Notable features include the compact redesign reducing the form factor from 0.38 to 0.21,the implementation of climate buffer zones maintaining 15℃without active heating,and the integration of photovoltaic panels and wind turbines.The combination of district heating with an Organic Rankine Cycle(ORC)system further optimized energy utilization.Post-retrofit calculations demonstrate a two-thirds reduction in annual unit energy consumption,with the building generating an energy surplus.This case study provides a comprehensive framework for achieving high energy performance in educational building retrofits,offering valuable lessons for similar initiatives in China and globally.The paper concludes by discussing the potential for widespread application of these strategies in China’s existing educational buildings,considering the country’s vast building stock and increasing energy efficiency requirements.展开更多
Since the founding of the People's Republic of China in 1949, China's global energy strategy has experienced three stages: "infancy", "growth" and "maturity". Chinese foreign ener...Since the founding of the People's Republic of China in 1949, China's global energy strategy has experienced three stages: "infancy", "growth" and "maturity". Chinese foreign energy cooperation has also gone through three periods chronologically, which include(1) the period when China got rid of its high dependence on oil imports from the Soviet Union, achieved self-reliance and even became a net exporter;(2) the period when China first focused on "bringing in" and then turned itself into a net importer of crude oil and refined oil; and(3) the period when China "went global" to engage in energy cooperation in diverse areas, gradually shifting into a leading role before launching the Belt and Road Initiative, which marked the full establishment of the Chinese global energy strategy. The objective of the Chinese global energy strategy has gradually changed from merely pursuing "energy strength" to transforming "energy strength" into "energy power"; the mission is mainly to "promote energy cooperation and energy revolution"; to implement this mission, China will provide international public goods to global and regional energy governance through energy diplomacy and services; and the areas covered by the strategy are countries and regions along the "Silk Road Economic Belt".展开更多
A threat of global warming should convince the public to accept a nuclear fission energy contribution to climate change mitigation, at least for the climate critical years up to 2065. The nuclear fission energy is ava...A threat of global warming should convince the public to accept a nuclear fission energy contribution to climate change mitigation, at least for the climate critical years up to 2065. The nuclear fission energy is available now, with proven reactors, such as advanced LWR （light water reactors）. Nuclear strategy in this paper outlines a proposal to replace all coal power plants （without carbon and capture storage system） with nuclear power plants in the period 2025-2065. Assuming once through advanced LWR technology, one would need nuclear capacity of 1,600 GW to replace coal power plants in that period. Corresponding reduction of emission would amount to 11.8 Gt of CO2. This energy strategy would reduce carbon emission by approximately 22% in the year 2065 and would be covered by projected uranium resources. An estimation of replacement costs showed that future carbon tax has a considerable potential to offset higher costs of nuclear replacement power.展开更多
Using electric motors instead of diesel engines as the driving system for mining excavators can reduce the energy consumption and operating costs.However,pure electric-driven mining excavators are prone to unexpected ...Using electric motors instead of diesel engines as the driving system for mining excavators can reduce the energy consumption and operating costs.However,pure electric-driven mining excavators are prone to unexpected power outages in mines because of drastic changes in load power,leading to significant fluctuations in the power demand of the grid,which in turn affects production.To solve the above problem,a pure electric-driven mining hydraulic excavator based on electric-motor-driven swing platform and hydraulic pumps was used as the research object.Moreover,supercapacitors and DC/DC converter,as the energy storage system(ESS)adjust the output power of the grid and recover the braking kinetic energy of the swing platform.Subsequently,a novel integrated energy management strategy for a DC bus voltage predictive controller based on the power feedforward of fuzzy rules is proposed to run mining excavators efficiently and reliably.Specifically,the working modes of the ESS are determined by the DC bus voltage and state of charge(SOC)of the supercapacitor.Next,the output power of the supercapacitor and the DC bus voltage were controlled by adjusting the charging and discharging currents of the DC/DC converter using a predictive controller and fuzzy rules.In addition,a digital prototype of the excavator was verified using an original machine test.The performance of the different strategies and driven systems were analyzed using digital prototypes.The results showed that,compared with traditional excavators with diesel engines,the operational cost of the developed excavators was reduced by 54.02%.Compared to pure electric-driven excavators without an ESS,the peak power of the grid for the developed excavators was reduced by 10%.This study designed an integrated energy management strategy for a pure electric mining excavator that can regulate the power output of the grid and maintain the stability of the bus voltage and SOC of the ESS.展开更多
Hydrogen fuel cell ships are one of the key solutions to achieving zero carbon emissions in shipping.Multi-fuel cell stacks(MFCS)systems are frequently employed to fulfill the power requirements of high-load power equ...Hydrogen fuel cell ships are one of the key solutions to achieving zero carbon emissions in shipping.Multi-fuel cell stacks(MFCS)systems are frequently employed to fulfill the power requirements of high-load power equipment on ships.Compared to single-stack system,MFCS may be difficult to apply traditional energy management strategies(EMS)due to their complex structure.In this paper,a two-layer power allocation strategy for MFCS of a hydrogen fuel cell ship is proposed to reduce the complexity of the allocation task by splitting it into each layer of the EMS.The first layer of the EMSis centered on the Nonlinear Model Predictive Control(NMPC).The Northern Goshawk Optimization(NGO)algorithm is used to solve the nonlinear optimization problem in NMPC,and the local fine search is performed using sequential quadratic programming(SQP).Based on the power allocation results of the first layer,the second layer is centered on a fuzzy rule-based adaptive power allocation strategy(AP-Fuzzy).The membership function bounds of the fuzzy controller are related to the aging level of the MFCS.The Particle Swarm Optimization(PSO)algorithm is used to optimize the parameters of the residual membership function to improve the performance of the proposed strategy.The effectiveness of the proposed EMS is verified by comparing it with the traditional EMS.The experimental results show that the EMS proposed in this paper can ensure reasonable hydrogen consumption,slow down the FC aging and equalize its performance,effectively extend the system life,and ensure that the ship has good endurance after completing the mission.展开更多
China＇s energy demand and energy imports have increased substantially in recent 5 years and will continue to grow in future. Increasing dependency on the world market and the tension between energy supply and demand ...China＇s energy demand and energy imports have increased substantially in recent 5 years and will continue to grow in future. Increasing dependency on the world market and the tension between energy supply and demand clearly show that energy is becoming a major constraint for China＇s future economic development. We introduce the background of China＇s energy demand and supply in this paper and discuss China＇s energy strategy in the twentyfirst century, focusing on growth, energy security and environmental sustainability.展开更多
“Those who owns the Middle East oil,will have the world.”The world’s major energy consumers-the United States and Russia holding the“energy card”meet in the Middle East.There are consensus and also contradictions...“Those who owns the Middle East oil,will have the world.”The world’s major energy consumers-the United States and Russia holding the“energy card”meet in the Middle East.There are consensus and also contradictions in their energy strategies and interests.Based on the comparison between the energy strategy and policy of the two countries,this article aims to provide their experience in the Middle East for China to think and learn.展开更多
In face of challenges to its energy security,China has been making adjustments in its energy policy and energy development strategy since mid-1990s,and implementing a strategy for overseas energy development.Compared ...In face of challenges to its energy security,China has been making adjustments in its energy policy and energy development strategy since mid-1990s,and implementing a strategy for overseas energy development.Compared with Central Asia,Latin America,Southeast Asia and West Africa,the Middle East is still the major source for China’s overseas energy cooperation and development.To avoid over-dependence on the energy resources in the Middle East,China seeks more overseas energy sources and transportation channels other than those in or connected to the Middle East.However,the primary role of the Middle East in China’s overall strategy for overseas energy development is still irreplaceable by that of any other region,at least for the near future.This situation will surely produce an increasingly important impact on China’s Middle East policy,moving China to take a more active posture in the political and economic arena of the region.It can even be expected that China to maintain its stable and friendly relations with Middle East countries,will,more likely than ever,act as a diplomatic mediator in trying to resolve certain longstanding conflicts in the region.展开更多
The year 2024 marks the tenth anniversary of China’s comprehensive implementation of the new energy security strategy,“Four Revolutions,One Cooperation.”Over the past decade,China has experienced a series of signif...The year 2024 marks the tenth anniversary of China’s comprehensive implementation of the new energy security strategy,“Four Revolutions,One Cooperation.”Over the past decade,China has experienced a series of significant changes in its energy sector,promoting comprehensive reforms in energy consumption patterns and consistently pursuing a cleaner,low-carbon energy structure.The country has accelerated the development of a diverse and clean energy supply system,creating a multifaceted supply network driven by coal,oil,gas,nuclear,and renewable energy sources,and continuously enhancing its energy supply capacity.By leveraging technological innovation as the primary driving force,China has thoroughly deepened energy system reforms to unleash market vitality and has strengthened international cooperation in the energy sector across all dimensions.The construction of a strong energy nation has further advanced,with significantly enhanced security assurance capabilities,effectively supporting and serving the healthy development of the economy and society.To accelerate the development of a new energy system,relevant national departments have introduced a series of industry policies and reform proposals in the energy sector.These initiatives aim to strongly support high-quality energy development by strengthening energy supply security,promoting a green and low-carbon energy transition,enhancing energy utilization efficiency,and improving energy market mechanisms and regulation.展开更多
Since the proposal of achieving dual carbon goals,countries worldwide have been actively seeking next-generation energy technologies.Ammonia energy,particularly green ammonia,has recently become a focal point of globa...Since the proposal of achieving dual carbon goals,countries worldwide have been actively seeking next-generation energy technologies.Ammonia energy,particularly green ammonia,has recently become a focal point of global attention.The global green ammonia market is expected to grow from USD 17 million in 2021 to USD 5.415 billion by 2030,with a growth rate of 90.2%during this period.As a fossil energy company primarily focused on oil and natural gas,CNPC faces significant pressure to transition to low-carbon operations and achieve dual carbon goals.Keeping track of the current status and technological advancements in ammonia energy development can support CNPC in more effectively implementing its new energy strategy.展开更多
Developing hydrogen energy is a key strategic pillar for global climate change mitigation and accelerating the energy transition.Currently,major economies globally are elevating hydrogen industry planning to national ...Developing hydrogen energy is a key strategic pillar for global climate change mitigation and accelerating the energy transition.Currently,major economies globally are elevating hydrogen industry planning to national energy strategy status,and international energy companies have begun to focus on developing hydrogen businesses.This study systematically reviews the development prospects,application fields,and strategic significance of hydrogen,summarizes the current status of the global hydrogen industry,analyzes the current development characteristics of the hydrogen industry,and reviews the hydrogen strategies of international energy companies.Finally,from a strategic,comprehensive,precise,and forward-looking perspective,it is suggested that China’s Energy enterprises promote the high-quality development of the hydrogen industry by overcoming bottlenecks across the entire hydrogen industry value chain,jointly driving industrial development from both the technology supply and demand sides,defining key development fields based on their respective strengths,and actively participating in international hydrogen energy trade.展开更多
A novel parallel hybrid electrical urban bus(PHEUB)configuration consisting of an extra one-way clutch and an automatic mechanical transmission(AMT)is taken as the study subject.An energy management strategy combining...A novel parallel hybrid electrical urban bus(PHEUB)configuration consisting of an extra one-way clutch and an automatic mechanical transmission(AMT)is taken as the study subject.An energy management strategy combining a logic threshold approach and an instantaneous optimization algorithm is proposed for the investigated PHEUB.The objective of the energy management strategy is to achieve acceptable vehicle performance and drivability requirements while simultaneously maximizing the engine fuel consumption and maintaining the battery state of charge in its operation range at all times.Under the environment of Matlab/Simulink,a computer simulation model for the PHEUB is constructed by using the model building method combining theoretical analysis and bench test data.Simulation and experiment results for China Typical Bus Driving Schedule at Urban District(CTBDS_UD)are obtained,and the results indicate that the proposed control strategy not only controls the hybrid system efficiently but also improves the fuel economy significantly.展开更多
Energy management strategy (EMS) is the core of the real-time controlalgorithm of the hybrid electric vehicle (HEV). A novel EMS using the logic threshold approach withincorporation of a stand-by optimization algorith...Energy management strategy (EMS) is the core of the real-time controlalgorithm of the hybrid electric vehicle (HEV). A novel EMS using the logic threshold approach withincorporation of a stand-by optimization algorithm is proposed. The aim of it is to minimize theengine fuel consumption and maintain the battery state of charge (SOC) in its operation range, whilesatisfying the vehicle performance and drivability requirements. The hybrid powertrain bench testis carried out to collect data of the engine, motor and battery pack, which are used in the EMS tocontrol the powertrain. Computer simulation model of the HEV is established in the MATLAB/Simulinkenvironment according to the bench test results. Simulation results are presented for behaviors ofthe engine, motor and battery. The proposed EMS is implemented for a real parallel hybrid carcontrol system and validated by vehicle field tests.展开更多
The development of intelligent connected technology has brought opportunities and challenges to the design of energy management strategies for hybrid electric vehicles.First,to achieve car-following in a connected env...The development of intelligent connected technology has brought opportunities and challenges to the design of energy management strategies for hybrid electric vehicles.First,to achieve car-following in a connected environment while reducing vehicle fuel consumption,a power split hybrid electric vehicle was used as the research object,and a mathematical model including engine,motor,generator,battery and vehicle longitudinal dynamics is established.Second,with the goal of vehicle energy saving,a layered optimization framework for hybrid electric vehicles in a networked environment is proposed.The speed planning problem is established in the upper-level controller,and the optimized speed of the vehicle is obtained and input to the lower-level controller.Furthermore,after the lower-level controller reaches the optimized speed,it distributes the torque among the energy sources of the hybrid electric vehicle based on the equivalent consumption minimum strategy.The simulation results show that the proposed layered control framework can achieve good car-following performance and obtain good fuel economy.展开更多
In this paper, a plug-in hybrid electrical vehicle(PHEV) is taken as the research object, and its dynamic performance and economic performance are taken as the research goals. Battery charge-sustaining(CS) period is d...In this paper, a plug-in hybrid electrical vehicle(PHEV) is taken as the research object, and its dynamic performance and economic performance are taken as the research goals. Battery charge-sustaining(CS) period is divided into power mode and economy mode. Energy management strategy designing methods of power mode and economy mode are proposed. Maximum velocity, acceleration performance and fuel consumption are simulated during the CS period in the AVL CRUISE simulation environment. The simulation results indicate that the maximum velocity and acceleration time of the power mode are better than those in the economy mode. Fuel consumption of the economy mode is better than that in the power mode. Fuel consumption of PHEV during the CS period is further improved by using the methods proposed in this paper, and this is meaningful for research and development of PHEV.展开更多
Aimed at the relatively lower energy density and complicated coordinating operation between two power sources,a special energy control strategy is required to maximize the fuel saving potential.Then a new type of conf...Aimed at the relatively lower energy density and complicated coordinating operation between two power sources,a special energy control strategy is required to maximize the fuel saving potential.Then a new type of configuration for hydrostatic transmission hybrid vehicles(PHHV) and the selection criterion for important components are proposed.Based on the optimization of planet gear transmission ratio and the analysis of optimal energy distribution for the proposed PHHV on a representative urban driving cycle,a fuzzy torque control strategy and a braking energy regeneration strategy are designed and developed to realize the real-time control of energy for the proposed PHHV.Simulation results demonstrate that the energy control strategy effectively improves the fuel economy of PHHV.展开更多
A novel method to calculate fuel-electric conversion factor for full hybrid electric vehicle（HEV）equipped with continuously variable transmission（CVT）is proposed.Based on consideration of the efficiency of pivotal...A novel method to calculate fuel-electric conversion factor for full hybrid electric vehicle（HEV）equipped with continuously variable transmission（CVT）is proposed.Based on consideration of the efficiency of pivotal components,electric motor,system efficiency optimization models are developed.According to the target of instantaneous optimization of system efficiency,operating ranges of each mode of power-train are determined,and the corresponding energy management strategies are established.The simulation results demonstrate that the energy management strategy proposed can substantially improve the vehicle fuel economy,and keep battery state of charge（SOC）change in a reasonable variation range.展开更多
The flux-modulated compound-structure permanent magnet synchronous machine (CS-PMSM), composed of a brushless double rotor machine (DRM) and a conventional permanent magnet synchronous machine (PMSM), is a power split...The flux-modulated compound-structure permanent magnet synchronous machine (CS-PMSM), composed of a brushless double rotor machine (DRM) and a conventional permanent magnet synchronous machine (PMSM), is a power split device for plug-in hybrid electric vehicles. In this paper, its operating principle and mathematical model are introduced. A modified current controller with decoupled state feedback is proposed and verified. The system control strategy is simulated in Matlab, and the feasibility of the control system is proven. To improve fuel economy, an energy management strategy based on fuzzy logic controller is proposed and evaluated by the Urban Dynamometer Driving Schedule (UDDS) drive cycle. The results show that the total energy consumption is similar to that of Prius 2012.展开更多
文摘The energy retrofit of public buildings is an effective strategy to achieve carbon neutrality goals,with educational buildings representing a significant proportion of this sector.This paper presents an in-depth analysis of energy retrofitting policies for educational buildings and examines the design case of the“Plus Energy School”demonstration project in Rostock,Germany.The study reveals innovative approaches in several key areas:overall layout optimization,creation of climate buffer zones,enhancement of building envelope performance,ventilation and heating system design,integration of diverse renewable energy sources,and formulation of energy balance schemes with corresponding calculations.The holistic theory and methodology of this energy strategy synergy offer valuable insights for the retrofitting of existing educational buildings in China.The project successfully transformed two aging school buildings into a single“plus energy”facility through coordinated architectural and technological interventions.Notable features include the compact redesign reducing the form factor from 0.38 to 0.21,the implementation of climate buffer zones maintaining 15℃without active heating,and the integration of photovoltaic panels and wind turbines.The combination of district heating with an Organic Rankine Cycle(ORC)system further optimized energy utilization.Post-retrofit calculations demonstrate a two-thirds reduction in annual unit energy consumption,with the building generating an energy surplus.This case study provides a comprehensive framework for achieving high energy performance in educational building retrofits,offering valuable lessons for similar initiatives in China and globally.The paper concludes by discussing the potential for widespread application of these strategies in China’s existing educational buildings,considering the country’s vast building stock and increasing energy efficiency requirements.
文摘Since the founding of the People's Republic of China in 1949, China's global energy strategy has experienced three stages: "infancy", "growth" and "maturity". Chinese foreign energy cooperation has also gone through three periods chronologically, which include(1) the period when China got rid of its high dependence on oil imports from the Soviet Union, achieved self-reliance and even became a net exporter;(2) the period when China first focused on "bringing in" and then turned itself into a net importer of crude oil and refined oil; and(3) the period when China "went global" to engage in energy cooperation in diverse areas, gradually shifting into a leading role before launching the Belt and Road Initiative, which marked the full establishment of the Chinese global energy strategy. The objective of the Chinese global energy strategy has gradually changed from merely pursuing "energy strength" to transforming "energy strength" into "energy power"; the mission is mainly to "promote energy cooperation and energy revolution"; to implement this mission, China will provide international public goods to global and regional energy governance through energy diplomacy and services; and the areas covered by the strategy are countries and regions along the "Silk Road Economic Belt".
文摘A threat of global warming should convince the public to accept a nuclear fission energy contribution to climate change mitigation, at least for the climate critical years up to 2065. The nuclear fission energy is available now, with proven reactors, such as advanced LWR （light water reactors）. Nuclear strategy in this paper outlines a proposal to replace all coal power plants （without carbon and capture storage system） with nuclear power plants in the period 2025-2065. Assuming once through advanced LWR technology, one would need nuclear capacity of 1,600 GW to replace coal power plants in that period. Corresponding reduction of emission would amount to 11.8 Gt of CO2. This energy strategy would reduce carbon emission by approximately 22% in the year 2065 and would be covered by projected uranium resources. An estimation of replacement costs showed that future carbon tax has a considerable potential to offset higher costs of nuclear replacement power.
基金Supported by National Natural Science Foundation of ChinaShanxi Coalbased Low-Carbon Joint Fund(Grant No.U1910211)。
文摘Using electric motors instead of diesel engines as the driving system for mining excavators can reduce the energy consumption and operating costs.However,pure electric-driven mining excavators are prone to unexpected power outages in mines because of drastic changes in load power,leading to significant fluctuations in the power demand of the grid,which in turn affects production.To solve the above problem,a pure electric-driven mining hydraulic excavator based on electric-motor-driven swing platform and hydraulic pumps was used as the research object.Moreover,supercapacitors and DC/DC converter,as the energy storage system(ESS)adjust the output power of the grid and recover the braking kinetic energy of the swing platform.Subsequently,a novel integrated energy management strategy for a DC bus voltage predictive controller based on the power feedforward of fuzzy rules is proposed to run mining excavators efficiently and reliably.Specifically,the working modes of the ESS are determined by the DC bus voltage and state of charge(SOC)of the supercapacitor.Next,the output power of the supercapacitor and the DC bus voltage were controlled by adjusting the charging and discharging currents of the DC/DC converter using a predictive controller and fuzzy rules.In addition,a digital prototype of the excavator was verified using an original machine test.The performance of the different strategies and driven systems were analyzed using digital prototypes.The results showed that,compared with traditional excavators with diesel engines,the operational cost of the developed excavators was reduced by 54.02%.Compared to pure electric-driven excavators without an ESS,the peak power of the grid for the developed excavators was reduced by 10%.This study designed an integrated energy management strategy for a pure electric mining excavator that can regulate the power output of the grid and maintain the stability of the bus voltage and SOC of the ESS.
基金supported by the National Key R&D Program of China(2022YFB4301403).
文摘Hydrogen fuel cell ships are one of the key solutions to achieving zero carbon emissions in shipping.Multi-fuel cell stacks(MFCS)systems are frequently employed to fulfill the power requirements of high-load power equipment on ships.Compared to single-stack system,MFCS may be difficult to apply traditional energy management strategies(EMS)due to their complex structure.In this paper,a two-layer power allocation strategy for MFCS of a hydrogen fuel cell ship is proposed to reduce the complexity of the allocation task by splitting it into each layer of the EMS.The first layer of the EMSis centered on the Nonlinear Model Predictive Control(NMPC).The Northern Goshawk Optimization(NGO)algorithm is used to solve the nonlinear optimization problem in NMPC,and the local fine search is performed using sequential quadratic programming(SQP).Based on the power allocation results of the first layer,the second layer is centered on a fuzzy rule-based adaptive power allocation strategy(AP-Fuzzy).The membership function bounds of the fuzzy controller are related to the aging level of the MFCS.The Particle Swarm Optimization(PSO)algorithm is used to optimize the parameters of the residual membership function to improve the performance of the proposed strategy.The effectiveness of the proposed EMS is verified by comparing it with the traditional EMS.The experimental results show that the EMS proposed in this paper can ensure reasonable hydrogen consumption,slow down the FC aging and equalize its performance,effectively extend the system life,and ensure that the ship has good endurance after completing the mission.
文摘China＇s energy demand and energy imports have increased substantially in recent 5 years and will continue to grow in future. Increasing dependency on the world market and the tension between energy supply and demand clearly show that energy is becoming a major constraint for China＇s future economic development. We introduce the background of China＇s energy demand and supply in this paper and discuss China＇s energy strategy in the twentyfirst century, focusing on growth, energy security and environmental sustainability.
文摘“Those who owns the Middle East oil,will have the world.”The world’s major energy consumers-the United States and Russia holding the“energy card”meet in the Middle East.There are consensus and also contradictions in their energy strategies and interests.Based on the comparison between the energy strategy and policy of the two countries,this article aims to provide their experience in the Middle East for China to think and learn.
文摘In face of challenges to its energy security,China has been making adjustments in its energy policy and energy development strategy since mid-1990s,and implementing a strategy for overseas energy development.Compared with Central Asia,Latin America,Southeast Asia and West Africa,the Middle East is still the major source for China’s overseas energy cooperation and development.To avoid over-dependence on the energy resources in the Middle East,China seeks more overseas energy sources and transportation channels other than those in or connected to the Middle East.However,the primary role of the Middle East in China’s overall strategy for overseas energy development is still irreplaceable by that of any other region,at least for the near future.This situation will surely produce an increasingly important impact on China’s Middle East policy,moving China to take a more active posture in the political and economic arena of the region.It can even be expected that China to maintain its stable and friendly relations with Middle East countries,will,more likely than ever,act as a diplomatic mediator in trying to resolve certain longstanding conflicts in the region.
文摘The year 2024 marks the tenth anniversary of China’s comprehensive implementation of the new energy security strategy,“Four Revolutions,One Cooperation.”Over the past decade,China has experienced a series of significant changes in its energy sector,promoting comprehensive reforms in energy consumption patterns and consistently pursuing a cleaner,low-carbon energy structure.The country has accelerated the development of a diverse and clean energy supply system,creating a multifaceted supply network driven by coal,oil,gas,nuclear,and renewable energy sources,and continuously enhancing its energy supply capacity.By leveraging technological innovation as the primary driving force,China has thoroughly deepened energy system reforms to unleash market vitality and has strengthened international cooperation in the energy sector across all dimensions.The construction of a strong energy nation has further advanced,with significantly enhanced security assurance capabilities,effectively supporting and serving the healthy development of the economy and society.To accelerate the development of a new energy system,relevant national departments have introduced a series of industry policies and reform proposals in the energy sector.These initiatives aim to strongly support high-quality energy development by strengthening energy supply security,promoting a green and low-carbon energy transition,enhancing energy utilization efficiency,and improving energy market mechanisms and regulation.
基金Integrating method of absorption and reaeration for CO_(2) capture(2023ZZ0101).
文摘Since the proposal of achieving dual carbon goals,countries worldwide have been actively seeking next-generation energy technologies.Ammonia energy,particularly green ammonia,has recently become a focal point of global attention.The global green ammonia market is expected to grow from USD 17 million in 2021 to USD 5.415 billion by 2030,with a growth rate of 90.2%during this period.As a fossil energy company primarily focused on oil and natural gas,CNPC faces significant pressure to transition to low-carbon operations and achieve dual carbon goals.Keeping track of the current status and technological advancements in ammonia energy development can support CNPC in more effectively implementing its new energy strategy.
文摘Developing hydrogen energy is a key strategic pillar for global climate change mitigation and accelerating the energy transition.Currently,major economies globally are elevating hydrogen industry planning to national energy strategy status,and international energy companies have begun to focus on developing hydrogen businesses.This study systematically reviews the development prospects,application fields,and strategic significance of hydrogen,summarizes the current status of the global hydrogen industry,analyzes the current development characteristics of the hydrogen industry,and reviews the hydrogen strategies of international energy companies.Finally,from a strategic,comprehensive,precise,and forward-looking perspective,it is suggested that China’s Energy enterprises promote the high-quality development of the hydrogen industry by overcoming bottlenecks across the entire hydrogen industry value chain,jointly driving industrial development from both the technology supply and demand sides,defining key development fields based on their respective strengths,and actively participating in international hydrogen energy trade.
基金Shanghai Municipal Science and Technology Commission,China(No.033012017).
文摘A novel parallel hybrid electrical urban bus(PHEUB)configuration consisting of an extra one-way clutch and an automatic mechanical transmission(AMT)is taken as the study subject.An energy management strategy combining a logic threshold approach and an instantaneous optimization algorithm is proposed for the investigated PHEUB.The objective of the energy management strategy is to achieve acceptable vehicle performance and drivability requirements while simultaneously maximizing the engine fuel consumption and maintaining the battery state of charge in its operation range at all times.Under the environment of Matlab/Simulink,a computer simulation model for the PHEUB is constructed by using the model building method combining theoretical analysis and bench test data.Simulation and experiment results for China Typical Bus Driving Schedule at Urban District(CTBDS_UD)are obtained,and the results indicate that the proposed control strategy not only controls the hybrid system efficiently but also improves the fuel economy significantly.
基金This project is supported by Electric Vehicle Key Project of National 863 Program of China (No.2001AA501200, 2001AA501211).
文摘Energy management strategy (EMS) is the core of the real-time controlalgorithm of the hybrid electric vehicle (HEV). A novel EMS using the logic threshold approach withincorporation of a stand-by optimization algorithm is proposed. The aim of it is to minimize theengine fuel consumption and maintain the battery state of charge (SOC) in its operation range, whilesatisfying the vehicle performance and drivability requirements. The hybrid powertrain bench testis carried out to collect data of the engine, motor and battery pack, which are used in the EMS tocontrol the powertrain. Computer simulation model of the HEV is established in the MATLAB/Simulinkenvironment according to the bench test results. Simulation results are presented for behaviors ofthe engine, motor and battery. The proposed EMS is implemented for a real parallel hybrid carcontrol system and validated by vehicle field tests.
基金supported by the National Natural Science Foundation of China(Grant No.62111530196)and the Technology Development Program of Jilin Province(Grant No.20200501010G X).
文摘The development of intelligent connected technology has brought opportunities and challenges to the design of energy management strategies for hybrid electric vehicles.First,to achieve car-following in a connected environment while reducing vehicle fuel consumption,a power split hybrid electric vehicle was used as the research object,and a mathematical model including engine,motor,generator,battery and vehicle longitudinal dynamics is established.Second,with the goal of vehicle energy saving,a layered optimization framework for hybrid electric vehicles in a networked environment is proposed.The speed planning problem is established in the upper-level controller,and the optimized speed of the vehicle is obtained and input to the lower-level controller.Furthermore,after the lower-level controller reaches the optimized speed,it distributes the torque among the energy sources of the hybrid electric vehicle based on the equivalent consumption minimum strategy.The simulation results show that the proposed layered control framework can achieve good car-following performance and obtain good fuel economy.
文摘In this paper, a plug-in hybrid electrical vehicle(PHEV) is taken as the research object, and its dynamic performance and economic performance are taken as the research goals. Battery charge-sustaining(CS) period is divided into power mode and economy mode. Energy management strategy designing methods of power mode and economy mode are proposed. Maximum velocity, acceleration performance and fuel consumption are simulated during the CS period in the AVL CRUISE simulation environment. The simulation results indicate that the maximum velocity and acceleration time of the power mode are better than those in the economy mode. Fuel consumption of the economy mode is better than that in the power mode. Fuel consumption of PHEV during the CS period is further improved by using the methods proposed in this paper, and this is meaningful for research and development of PHEV.
基金Sponsored by the National Natural Science Foundation of China(Grant No.50375033)the National Key Laboratory of Vehicular Transmission(Grant No.51457050105HT0112)
文摘Aimed at the relatively lower energy density and complicated coordinating operation between two power sources,a special energy control strategy is required to maximize the fuel saving potential.Then a new type of configuration for hydrostatic transmission hybrid vehicles(PHHV) and the selection criterion for important components are proposed.Based on the optimization of planet gear transmission ratio and the analysis of optimal energy distribution for the proposed PHHV on a representative urban driving cycle,a fuzzy torque control strategy and a braking energy regeneration strategy are designed and developed to realize the real-time control of energy for the proposed PHHV.Simulation results demonstrate that the energy control strategy effectively improves the fuel economy of PHHV.
基金Supported by the National Science and Technology Support Program(2013BAG12B01)Foundational and Advanced Research Program General Project of Chongqing City(cstc2013jcyjjq60002)
文摘A novel method to calculate fuel-electric conversion factor for full hybrid electric vehicle（HEV）equipped with continuously variable transmission（CVT）is proposed.Based on consideration of the efficiency of pivotal components,electric motor,system efficiency optimization models are developed.According to the target of instantaneous optimization of system efficiency,operating ranges of each mode of power-train are determined,and the corresponding energy management strategies are established.The simulation results demonstrate that the energy management strategy proposed can substantially improve the vehicle fuel economy,and keep battery state of charge（SOC）change in a reasonable variation range.
基金This work was supported by National Natural Science Foundation of China under Project 51325701,51377030,and 51407042.
文摘The flux-modulated compound-structure permanent magnet synchronous machine (CS-PMSM), composed of a brushless double rotor machine (DRM) and a conventional permanent magnet synchronous machine (PMSM), is a power split device for plug-in hybrid electric vehicles. In this paper, its operating principle and mathematical model are introduced. A modified current controller with decoupled state feedback is proposed and verified. The system control strategy is simulated in Matlab, and the feasibility of the control system is proven. To improve fuel economy, an energy management strategy based on fuzzy logic controller is proposed and evaluated by the Urban Dynamometer Driving Schedule (UDDS) drive cycle. The results show that the total energy consumption is similar to that of Prius 2012.
