An integrated laser diode driver(LDD) driving an edge-emitting laser diode was designed and fabricated by 0.35 μm BiCMOS technology. This paper proposes a scheme which combines the automatic power control loop and te...An integrated laser diode driver(LDD) driving an edge-emitting laser diode was designed and fabricated by 0.35 μm BiCMOS technology. This paper proposes a scheme which combines the automatic power control loop and temperature com-pensation for modulation current in order to maintain constant extinction ratio and average optical power. To implement tem-perature compensation for modulation current,a novel circuit which generates a PTAT current by using the injecting base current of a bipolar transistor in saturation region,and alternates the amplifier feedback loop(closed or not) to control the state of the current path is presented. Simulation results showed that programmed by choice of external resistors,the IC can provide modu-lation current from 5 mA to 85 mA with temperature compensation adjustments and independent bias current from 4 mA to 100 mA. Optical test results showed that clear eye-diagrams can be obtained at 155 Mbps,with the output optical power being nearly constant,and the variation of extinction ratio being lower than 0.7 dB.展开更多
It is need to establish site project department during the construction of electric power project.The head office should design and build the main structure,continually improve structure of project department,meantime...It is need to establish site project department during the construction of electric power project.The head office should design and build the main structure,continually improve structure of project department,meantime,positively apply principle of automatic control to improve the site management of electric power construction.In this article,the application strategy of principle of automatic control is analyzed focusing on the site work of electric power construction.展开更多
In order to optimize the allocation of power resources, ensure the safe and stable operation of the power system, maintain the coordinated development of the power grid and grid-connected power plants, and minimize li...In order to optimize the allocation of power resources, ensure the safe and stable operation of the power system, maintain the coordinated development of the power grid and grid-connected power plants, and minimize line losses. The power dispatching institution shall issue the bus voltage curve to the grid-connected power plants on a quarterly basis, which shall be used as the basis for the assessment of reactive auxiliary services. In order to maintain the target voltage value issued by the power grid, the power plant adopts automatic voltage control device (AVC), and realizes the automation and intelligence of power plant voltage adjustment by adjusting and controlling the reactive power of the excitation system to respond to the target voltage value of the power grid system.展开更多
This study presents the use of an innovative population-based algorithm called the Sine Cosine Algorithm and its metaheuristic form,Quasi Oppositional Sine Cosine Algorithm,to automatic generation control of a multipl...This study presents the use of an innovative population-based algorithm called the Sine Cosine Algorithm and its metaheuristic form,Quasi Oppositional Sine Cosine Algorithm,to automatic generation control of a multiple-source-based interconnected power system that consists of thermal,gas,and hydro power plants.The Proportional-Integral-Derivative controller,which is utilized for automated generation control in an interconnected hybrid power systemwith aDClink connecting two regions,has been tuned using the proposed optimization technique.An Electric Vehicle is taken into consideration only as an electrical load.The Quasi Oppositional Sine Cosinemethod’s performance and efficacy have been compared to the Sine Cosine Algorithm and optimal output feedback controller tuning performance.Applying the QOSCA optimization technique,which has only been shown in this study in the context of an LFC research thus far,makes this paper unique.The main objective has been used to assess and compare the dynamic performances of the recommended controller along with QOSCA optimisation technic.The resilience of the controller is examined using two different system parameters:B(frequency bias parameter)and R(governor speed regulation).The sensitivity analysis results demonstrate the high reliability of the QOSCA algorithm-based controller.Once optimal controller gains are established for nominal conditions,step load perturbations up to±10%&±25%in the nominal values of the systemparameters and operational load condition do not require adjustment of the controller.Ultimately,a scenario is examined whereby EVs are used for area 1,and a single PID controller is used rather than three.展开更多
Currently, the high-speed serial fiber-optic ring net communication is a main method for performing the distributed control network topology and control mode. Because of a network transmission delay inherent in the to...Currently, the high-speed serial fiber-optic ring net communication is a main method for performing the distributed control network topology and control mode. Because of a network transmission delay inherent in the topology, synchronization between nodes has become a critical issue which needs to be studied. The existing synchronization methods largely depend on the complex communication protocol. Therefore, this paper has proposed a method of automatic measurement and compensation of synchronization delay, and analyzed its operating principle and implementation procedure in detail. The results obtained from the experiments prove the proposed method to be correct, effective and practicable.展开更多
The application frequency of electric power automation technology is higher and higher. When electric power enterprises carry out automation construction, according to the actual development status, they carry out the...The application frequency of electric power automation technology is higher and higher. When electric power enterprises carry out automation construction, according to the actual development status, they carry out the distribution of new energy, which can improve the development level of China's electric power industry. Vigorously carry out the power supply and distribution automation control work;provide more development strategies for the power supply and distribution industry, aiming to provide technical basis for the future development of the power industry;improve the service level of the industry, but also provide technical power for social development.展开更多
Given the actual working of a fully mechanized plough at a mining face, we have proposed a formula for running constraints between powered supports and a coal plough under assumed geological conditions of the coal fac...Given the actual working of a fully mechanized plough at a mining face, we have proposed a formula for running constraints between powered supports and a coal plough under assumed geological conditions of the coal face and, on this basis, established an automatic control model of powered supports for the coal plough face. We introduced the working principle of the powered support control system of the plough at the mining face. We established three advanced characteristics of this control system： response speed, reliability and easy maintenance of the system. As well, we briefly introduced, the principal function of primary and subordinate controllers and the realization of the communication system by a Single Bus. Ten controllers were constructed and tested in our laboratorium. The results show that the control model is practical and meets actual conditions. It provides a theoretical basis for designing a comouter control system for a oowered support system of a plough at a mining face.展开更多
Since wind power has the features of being intermittent and unpredictable, and usually needs transmission over long distances, grid integration of large-scale wind power will exert signif icant influence on power grid...Since wind power has the features of being intermittent and unpredictable, and usually needs transmission over long distances, grid integration of large-scale wind power will exert signif icant influence on power grid planning and construction, and will make a heavy impact on the safe and reliable operation of power systems. To deal with the diff iculties of large scale wind power dispatch, this paper presents a new automatic generation control (AGC) scheme that involves the participation of wind farms. The scheme is based on ultra-short-term wind power forecast. The author establishes a generation output distribution optimization mode for the power system with wind farms and verif ies the feasibility of the scheme by an example.展开更多
Vehicle hydraulic pump station, often work environment is poor, the environment temperature difference is very big, the natureof the hydraulic oil is affected by temperature is very big, a lot of damage, PLC automatic...Vehicle hydraulic pump station, often work environment is poor, the environment temperature difference is very big, the natureof the hydraulic oil is affected by temperature is very big, a lot of damage, PLC automatic control scheme and design of pumping station, the oiltemperature automatic control system realized the automation of the oil temperature control, greatly improving the pump station of the outdoorenvironment to adapt to the performance.展开更多
为了解决电网薄弱地区大型铜矿的能源保障与稳定供电问题,该文提出一种基于矿电双向互动机制的纯离网型新能源电力系统协同优化调度方法。首先,通过分析源荷电力电量平衡关系与系统调控资源特性,构建了矿电协同调度体系架构;在此基础上...为了解决电网薄弱地区大型铜矿的能源保障与稳定供电问题,该文提出一种基于矿电双向互动机制的纯离网型新能源电力系统协同优化调度方法。首先,通过分析源荷电力电量平衡关系与系统调控资源特性,构建了矿电协同调度体系架构;在此基础上,综合考虑新能源出力波动性、应急电源与构网型储能运行约束、原矿堆场可调度能力以及负荷分轮分级调控要求,建立了覆盖全年8760 h连续运行并包含多种极端工况的多时间尺度协同调度模型。最后,基于实时数字模拟(real-time digital simulation,RTDS)仿真平台的测试结果表明,所提方法可有效优化应急电源配置容量,降低系统初始投资与运营成本,同时提升源荷互动能力与供电可靠性。该研究为纯离网矿用新能源电力系统的稳定、高效运行提供了关键技术支撑与实验依据,对推动偏远矿区绿色低碳转型具有参考价值。展开更多
基金Project (No. 2006AA01Z226) supported by the Hi-Tech Researchand Development Program (863) of China
文摘An integrated laser diode driver(LDD) driving an edge-emitting laser diode was designed and fabricated by 0.35 μm BiCMOS technology. This paper proposes a scheme which combines the automatic power control loop and temperature com-pensation for modulation current in order to maintain constant extinction ratio and average optical power. To implement tem-perature compensation for modulation current,a novel circuit which generates a PTAT current by using the injecting base current of a bipolar transistor in saturation region,and alternates the amplifier feedback loop(closed or not) to control the state of the current path is presented. Simulation results showed that programmed by choice of external resistors,the IC can provide modu-lation current from 5 mA to 85 mA with temperature compensation adjustments and independent bias current from 4 mA to 100 mA. Optical test results showed that clear eye-diagrams can be obtained at 155 Mbps,with the output optical power being nearly constant,and the variation of extinction ratio being lower than 0.7 dB.
文摘It is need to establish site project department during the construction of electric power project.The head office should design and build the main structure,continually improve structure of project department,meantime,positively apply principle of automatic control to improve the site management of electric power construction.In this article,the application strategy of principle of automatic control is analyzed focusing on the site work of electric power construction.
文摘In order to optimize the allocation of power resources, ensure the safe and stable operation of the power system, maintain the coordinated development of the power grid and grid-connected power plants, and minimize line losses. The power dispatching institution shall issue the bus voltage curve to the grid-connected power plants on a quarterly basis, which shall be used as the basis for the assessment of reactive auxiliary services. In order to maintain the target voltage value issued by the power grid, the power plant adopts automatic voltage control device (AVC), and realizes the automation and intelligence of power plant voltage adjustment by adjusting and controlling the reactive power of the excitation system to respond to the target voltage value of the power grid system.
文摘This study presents the use of an innovative population-based algorithm called the Sine Cosine Algorithm and its metaheuristic form,Quasi Oppositional Sine Cosine Algorithm,to automatic generation control of a multiple-source-based interconnected power system that consists of thermal,gas,and hydro power plants.The Proportional-Integral-Derivative controller,which is utilized for automated generation control in an interconnected hybrid power systemwith aDClink connecting two regions,has been tuned using the proposed optimization technique.An Electric Vehicle is taken into consideration only as an electrical load.The Quasi Oppositional Sine Cosinemethod’s performance and efficacy have been compared to the Sine Cosine Algorithm and optimal output feedback controller tuning performance.Applying the QOSCA optimization technique,which has only been shown in this study in the context of an LFC research thus far,makes this paper unique.The main objective has been used to assess and compare the dynamic performances of the recommended controller along with QOSCA optimisation technic.The resilience of the controller is examined using two different system parameters:B(frequency bias parameter)and R(governor speed regulation).The sensitivity analysis results demonstrate the high reliability of the QOSCA algorithm-based controller.Once optimal controller gains are established for nominal conditions,step load perturbations up to±10%&±25%in the nominal values of the systemparameters and operational load condition do not require adjustment of the controller.Ultimately,a scenario is examined whereby EVs are used for area 1,and a single PID controller is used rather than three.
文摘Currently, the high-speed serial fiber-optic ring net communication is a main method for performing the distributed control network topology and control mode. Because of a network transmission delay inherent in the topology, synchronization between nodes has become a critical issue which needs to be studied. The existing synchronization methods largely depend on the complex communication protocol. Therefore, this paper has proposed a method of automatic measurement and compensation of synchronization delay, and analyzed its operating principle and implementation procedure in detail. The results obtained from the experiments prove the proposed method to be correct, effective and practicable.
文摘The application frequency of electric power automation technology is higher and higher. When electric power enterprises carry out automation construction, according to the actual development status, they carry out the distribution of new energy, which can improve the development level of China's electric power industry. Vigorously carry out the power supply and distribution automation control work;provide more development strategies for the power supply and distribution industry, aiming to provide technical basis for the future development of the power industry;improve the service level of the industry, but also provide technical power for social development.
基金Project 104030 supported by the Ministry of Education of the People’s Republic of China
文摘Given the actual working of a fully mechanized plough at a mining face, we have proposed a formula for running constraints between powered supports and a coal plough under assumed geological conditions of the coal face and, on this basis, established an automatic control model of powered supports for the coal plough face. We introduced the working principle of the powered support control system of the plough at the mining face. We established three advanced characteristics of this control system： response speed, reliability and easy maintenance of the system. As well, we briefly introduced, the principal function of primary and subordinate controllers and the realization of the communication system by a Single Bus. Ten controllers were constructed and tested in our laboratorium. The results show that the control model is practical and meets actual conditions. It provides a theoretical basis for designing a comouter control system for a oowered support system of a plough at a mining face.
文摘Since wind power has the features of being intermittent and unpredictable, and usually needs transmission over long distances, grid integration of large-scale wind power will exert signif icant influence on power grid planning and construction, and will make a heavy impact on the safe and reliable operation of power systems. To deal with the diff iculties of large scale wind power dispatch, this paper presents a new automatic generation control (AGC) scheme that involves the participation of wind farms. The scheme is based on ultra-short-term wind power forecast. The author establishes a generation output distribution optimization mode for the power system with wind farms and verif ies the feasibility of the scheme by an example.
文摘Vehicle hydraulic pump station, often work environment is poor, the environment temperature difference is very big, the natureof the hydraulic oil is affected by temperature is very big, a lot of damage, PLC automatic control scheme and design of pumping station, the oiltemperature automatic control system realized the automation of the oil temperature control, greatly improving the pump station of the outdoorenvironment to adapt to the performance.
文摘为了解决电网薄弱地区大型铜矿的能源保障与稳定供电问题,该文提出一种基于矿电双向互动机制的纯离网型新能源电力系统协同优化调度方法。首先,通过分析源荷电力电量平衡关系与系统调控资源特性,构建了矿电协同调度体系架构;在此基础上,综合考虑新能源出力波动性、应急电源与构网型储能运行约束、原矿堆场可调度能力以及负荷分轮分级调控要求,建立了覆盖全年8760 h连续运行并包含多种极端工况的多时间尺度协同调度模型。最后,基于实时数字模拟(real-time digital simulation,RTDS)仿真平台的测试结果表明,所提方法可有效优化应急电源配置容量,降低系统初始投资与运营成本,同时提升源荷互动能力与供电可靠性。该研究为纯离网矿用新能源电力系统的稳定、高效运行提供了关键技术支撑与实验依据,对推动偏远矿区绿色低碳转型具有参考价值。
