As the plasma current power in tokamak devices increases,a significant number of stray magnetic fields are generated around the equipment.These stray magnetic fields can disrupt the operation of electronic power devic...As the plasma current power in tokamak devices increases,a significant number of stray magnetic fields are generated around the equipment.These stray magnetic fields can disrupt the operation of electronic power devices,particularly transformers in switched-mode power supplies.Testing flyback converters with transformers under strong background magnetic fields highlights electromagnetic compatibility(EMC)issues for such switched-mode power supplies.This study utilizes finite element analysis software to simulate the electromagnetic environment of switched-mode power supply transformers and investigates the impact of variations in different magnetic field parameters on the performance of switched-mode power supplies under strong stray magnetic fields.The findings indicate that EMC issues are associated with transformer core saturation and can be alleviated through appropriate configurations of the core size,air gap,fillet radius,and installation direction.This study offers novel solutions for addressing EMC issues in high magnetic field environments.展开更多
At present, due to the rapid development of Chinese science and technology economy, Chinese information technology level is also constantly improving, and the application of electronic information technology and elect...At present, due to the rapid development of Chinese science and technology economy, Chinese information technology level is also constantly improving, and the application of electronic information technology and electrical technology in Chinese power system is also possible. Electronic and electrical technology plays a very important role in the power system, which is helpful to improve the operation efficiency of the power system and make the power engineering construction in China develop better. Therefore, the technical personnel of relevant scientific departments should strengthen the research of electronic and electrical technology, so as to optimize the operation of electrical system in China and improve the application level of electronic and electrical technology in power system. On this basis, this paper discusses the application of electronic technology in power system for reference.展开更多
The forthcoming European Higher Education Area has implied an important change in the teaching/learning process:it is necessary to get students more involved as well as to promote their independence and active partici...The forthcoming European Higher Education Area has implied an important change in the teaching/learning process:it is necessary to get students more involved as well as to promote their independence and active participation.Furthermore,Information and Communication Technology is progressively including greater spaces in human beings’life,as economics,arts,engineering and education,among others fields.Therefore,a web tool,based on a content management system,has been developed to teach the Power Electronics subject.Moreover,the use of these multimedia tools makes it possible to encourage students’independence.This developed educational software is necessary as an important resource in the students’teaching/learning process.Therefore,the importance of evaluation models increases in as much as the application of these instruments allows its effective evaluation.It offers a greater guarantee of its use in these environments from the students’point of view.An evaluation process,by means of several surveys for students and lecturers,is used in order to evaluate the quality of these multimedia interactive tools.The results demonstrate that the use of this web tool increases students’motivation significantly.展开更多
Power electronics is a new technology of power transmission and control.Compared with the traditional power transmission,non-contact power transmission has the advantages of low wear rate,safety,reliability,convenienc...Power electronics is a new technology of power transmission and control.Compared with the traditional power transmission,non-contact power transmission has the advantages of low wear rate,safety,reliability,convenience and flexibility.In this way,it avoids the problems of friction,wear,aging and so on in the traditional power supply mode,saves a lot of wires,makes up for the shortcomings of the traditional power transmission mode,and has a wider application range.Therefore,it is of great practical significance to study the key technology of power electronic information transmission for promoting the intelligent development of power transmission in China.展开更多
With the advancement of energy structure transformation and the construction of new power systems,microgrids have become the core carrier for the integration of distributed renewable energy,while power electronics tec...With the advancement of energy structure transformation and the construction of new power systems,microgrids have become the core carrier for the integration of distributed renewable energy,while power electronics technology serves as the key support for the efficient operation of microgrids.Through literature research,empirical analysis,and case verification,this paper systematically summarizes the current application status of power electronics technology in microgrids,analyzes existing research gaps,constructs a device adaptation model and a dynamic control strategy,and finally forms an implementable optimization scheme.The research shows that when the proportion of new energy in microgrids is≥50%,the full-life-cycle benefit of Silicon Carbide(SiC)devices is optimal;the improved droop control can reduce frequency fluctuations by 70%,offering technical support for the large-scale application of microgrids.展开更多
For building Global Energy Interconnection(GEI), it is necessary to implement new breakthroughs on largepower system simulation. Key routes for implementing full electromagnetic transient simulation of large-power sys...For building Global Energy Interconnection(GEI), it is necessary to implement new breakthroughs on largepower system simulation. Key routes for implementing full electromagnetic transient simulation of large-power systems are described in this paper, and a top framework is designed. A combination of the new large time step algorithm and the traditional small-time step algorithm is proposed where both parts A and B are calculated independently. The method for integrating the Norton equivalence of the power electronic system to the entire power grid is proposed. A two-level gird division structure is proposed, which executes a multi-rate parallel calculation among subsystems and element parallel calculation in each subsystem. The initialization method of combining load flow derivation and automatic trial-and-error launching is introduced. The feasibility of the method is demonstrated through a practical power grid example, which lays a foundation for further research.展开更多
A low cost of die area and power consumption CMOS image sensor readout circuit with fixed pattern noise(FPN) cancellation is proposed.By using only one coupling capacitor and switch in the double FPN cancelling correl...A low cost of die area and power consumption CMOS image sensor readout circuit with fixed pattern noise(FPN) cancellation is proposed.By using only one coupling capacitor and switch in the double FPN cancelling correlative double sampling(CDS),pixel FPN is cancelled and column FPN is stored and eliminated by the sampleand-hold operation of digitally programmable gain amplifier(DPGA).The bandwidth balance technology based on operational amplifier(op-amp) sharing is also introduced to decrease the power dissi...展开更多
To accurately predict the fatigue life of a power device, a fatigue life evaluation method that is based on the power cycle is presented in terms of an algorithm based on a combination of electrical analysis, heat ana...To accurately predict the fatigue life of a power device, a fatigue life evaluation method that is based on the power cycle is presented in terms of an algorithm based on a combination of electrical analysis, heat analysis, and stress analysis. In literature, the fatigue life of power devices has been evaluated on the basis of the thermal cycle. This cycle is alternately repeated within a range from a high temperature to a low temperature. In an actual operating environment, however, a power device works in a power cycle that consists of being switched ON and OFF. To accurately predict the fatigue life cycle of a device, then, the evaluation should take account of this important aspect of the power cycle. To verify the utility of the evaluation method presented in this study, the results for a power cycle based on the combined use of electrical analysis, heat analysis, and stress analysis are compared to the results based on the thermal cycle, as found in the literature. Our conclusion is that the fatigue life cycle as estimated by the thermal cycle test is higher than that estimated by the power cycle.展开更多
As the cut-in point of research on control and power electronics technology used in renewable energy, this paper does not aim to analyze particular theories or tech-nologies in this field, but, instead, is to go back ...As the cut-in point of research on control and power electronics technology used in renewable energy, this paper does not aim to analyze particular theories or tech-nologies in this field, but, instead, is to go back to the fountainhead of the issue to illustrate the essential concepts in this field, which are usually neglected and may become bottle-neck of the research. Research experiences have shown that con-fusion and trouble may be created if researchers do not understand these essential concepts well.展开更多
With the development of society,the power system plays an important role in the global energy structure.However,facing increasing energy demand and environmental pressure,improving power system efficiency,reducing cos...With the development of society,the power system plays an important role in the global energy structure.However,facing increasing energy demand and environmental pressure,improving power system efficiency,reducing costs,and ensuring reliability and safety have become key issues.The Internet of Things(IoT)power electronics technology,as one of the research hotspots,integrates IoT and power electronics technology to achieve intelligent and optimized control of power systems through sensors,communication,and control technologies.In order to meet current and future needs,it is necessary to optimize the operation and management of power systems using IoT power electronics technology.By analyzing the application of Internet of Things power electronics technology and the optimal dispatch of power systems,support vector machine algorithms are used to analyze and process equipment data,and perform data monitoring and anomaly detection to promote energy waste reduction and energy saving,and then start from operation and maintenance respectively.Comparative simulation experiments were conducted in five aspects:efficiency,effectiveness of power load prediction and optimization control,effectiveness of intelligent monitoring,operating costs,and data security.The experimental results show that the operation and maintenance efficiency of the power system using IoT power electronics technology has been improved to only 18 h for equipment fault handling.The accuracy of load forecasting optimization control based on IoT power electronics technology reaches 94%.The fault detection accuracy of intelligent monitoring of power equipment based on the power electronics technology of the Internet of Things has reached 96%.At the same time,the Internet of Things power electronics technology was used to improve the power operation mode,so as to promote the monthly electricity sales revenue of 2.77 million RMB.In addition,the effectiveness of IoT power electronics technology in power data security management has reached 95%.In summary,IoT power electronics technology can improve the stability,reliability,and security of power systems,reduce costs,improve efficiency and management level,and has broad application and promotion prospects.展开更多
基金supported by the Natural Science Foundation of Anhui Province(No.228085ME142)the Comprehensive Research Facility for the Fusion Technology Program of China(No.20180000527301001228)the Open Fund of the Magnetic Confinement Fusion Laboratory of Anhui Province(No.2024AMF04003)。
文摘As the plasma current power in tokamak devices increases,a significant number of stray magnetic fields are generated around the equipment.These stray magnetic fields can disrupt the operation of electronic power devices,particularly transformers in switched-mode power supplies.Testing flyback converters with transformers under strong background magnetic fields highlights electromagnetic compatibility(EMC)issues for such switched-mode power supplies.This study utilizes finite element analysis software to simulate the electromagnetic environment of switched-mode power supply transformers and investigates the impact of variations in different magnetic field parameters on the performance of switched-mode power supplies under strong stray magnetic fields.The findings indicate that EMC issues are associated with transformer core saturation and can be alleviated through appropriate configurations of the core size,air gap,fillet radius,and installation direction.This study offers novel solutions for addressing EMC issues in high magnetic field environments.
文摘At present, due to the rapid development of Chinese science and technology economy, Chinese information technology level is also constantly improving, and the application of electronic information technology and electrical technology in Chinese power system is also possible. Electronic and electrical technology plays a very important role in the power system, which is helpful to improve the operation efficiency of the power system and make the power engineering construction in China develop better. Therefore, the technical personnel of relevant scientific departments should strengthen the research of electronic and electrical technology, so as to optimize the operation of electrical system in China and improve the application level of electronic and electrical technology in power system. On this basis, this paper discusses the application of electronic technology in power system for reference.
文摘The forthcoming European Higher Education Area has implied an important change in the teaching/learning process:it is necessary to get students more involved as well as to promote their independence and active participation.Furthermore,Information and Communication Technology is progressively including greater spaces in human beings’life,as economics,arts,engineering and education,among others fields.Therefore,a web tool,based on a content management system,has been developed to teach the Power Electronics subject.Moreover,the use of these multimedia tools makes it possible to encourage students’independence.This developed educational software is necessary as an important resource in the students’teaching/learning process.Therefore,the importance of evaluation models increases in as much as the application of these instruments allows its effective evaluation.It offers a greater guarantee of its use in these environments from the students’point of view.An evaluation process,by means of several surveys for students and lecturers,is used in order to evaluate the quality of these multimedia interactive tools.The results demonstrate that the use of this web tool increases students’motivation significantly.
文摘Power electronics is a new technology of power transmission and control.Compared with the traditional power transmission,non-contact power transmission has the advantages of low wear rate,safety,reliability,convenience and flexibility.In this way,it avoids the problems of friction,wear,aging and so on in the traditional power supply mode,saves a lot of wires,makes up for the shortcomings of the traditional power transmission mode,and has a wider application range.Therefore,it is of great practical significance to study the key technology of power electronic information transmission for promoting the intelligent development of power transmission in China.
文摘With the advancement of energy structure transformation and the construction of new power systems,microgrids have become the core carrier for the integration of distributed renewable energy,while power electronics technology serves as the key support for the efficient operation of microgrids.Through literature research,empirical analysis,and case verification,this paper systematically summarizes the current application status of power electronics technology in microgrids,analyzes existing research gaps,constructs a device adaptation model and a dynamic control strategy,and finally forms an implementable optimization scheme.The research shows that when the proportion of new energy in microgrids is≥50%,the full-life-cycle benefit of Silicon Carbide(SiC)devices is optimal;the improved droop control can reduce frequency fluctuations by 70%,offering technical support for the large-scale application of microgrids.
基金supported by key project of smart grid technology and equipment of national key research and development plan of China (2016YFB0900601)
文摘For building Global Energy Interconnection(GEI), it is necessary to implement new breakthroughs on largepower system simulation. Key routes for implementing full electromagnetic transient simulation of large-power systems are described in this paper, and a top framework is designed. A combination of the new large time step algorithm and the traditional small-time step algorithm is proposed where both parts A and B are calculated independently. The method for integrating the Norton equivalence of the power electronic system to the entire power grid is proposed. A two-level gird division structure is proposed, which executes a multi-rate parallel calculation among subsystems and element parallel calculation in each subsystem. The initialization method of combining load flow derivation and automatic trial-and-error launching is introduced. The feasibility of the method is demonstrated through a practical power grid example, which lays a foundation for further research.
基金Supported by National Natural Science Foundation of China (No.60806010,No.60976030)Tianjin Innovation Special Funds for Science and Technology (No.05FZZDGX00200)
文摘A low cost of die area and power consumption CMOS image sensor readout circuit with fixed pattern noise(FPN) cancellation is proposed.By using only one coupling capacitor and switch in the double FPN cancelling correlative double sampling(CDS),pixel FPN is cancelled and column FPN is stored and eliminated by the sampleand-hold operation of digitally programmable gain amplifier(DPGA).The bandwidth balance technology based on operational amplifier(op-amp) sharing is also introduced to decrease the power dissi...
文摘To accurately predict the fatigue life of a power device, a fatigue life evaluation method that is based on the power cycle is presented in terms of an algorithm based on a combination of electrical analysis, heat analysis, and stress analysis. In literature, the fatigue life of power devices has been evaluated on the basis of the thermal cycle. This cycle is alternately repeated within a range from a high temperature to a low temperature. In an actual operating environment, however, a power device works in a power cycle that consists of being switched ON and OFF. To accurately predict the fatigue life cycle of a device, then, the evaluation should take account of this important aspect of the power cycle. To verify the utility of the evaluation method presented in this study, the results for a power cycle based on the combined use of electrical analysis, heat analysis, and stress analysis are compared to the results based on the thermal cycle, as found in the literature. Our conclusion is that the fatigue life cycle as estimated by the thermal cycle test is higher than that estimated by the power cycle.
基金Supported by the National Natural Science Foundation of China (Grant No. 60534040)
文摘As the cut-in point of research on control and power electronics technology used in renewable energy, this paper does not aim to analyze particular theories or tech-nologies in this field, but, instead, is to go back to the fountainhead of the issue to illustrate the essential concepts in this field, which are usually neglected and may become bottle-neck of the research. Research experiences have shown that con-fusion and trouble may be created if researchers do not understand these essential concepts well.
基金supported by the State Grid Hebei Electric Power Spot Market Technical Support System Construction Project(No.1R04BB18002V).
文摘With the development of society,the power system plays an important role in the global energy structure.However,facing increasing energy demand and environmental pressure,improving power system efficiency,reducing costs,and ensuring reliability and safety have become key issues.The Internet of Things(IoT)power electronics technology,as one of the research hotspots,integrates IoT and power electronics technology to achieve intelligent and optimized control of power systems through sensors,communication,and control technologies.In order to meet current and future needs,it is necessary to optimize the operation and management of power systems using IoT power electronics technology.By analyzing the application of Internet of Things power electronics technology and the optimal dispatch of power systems,support vector machine algorithms are used to analyze and process equipment data,and perform data monitoring and anomaly detection to promote energy waste reduction and energy saving,and then start from operation and maintenance respectively.Comparative simulation experiments were conducted in five aspects:efficiency,effectiveness of power load prediction and optimization control,effectiveness of intelligent monitoring,operating costs,and data security.The experimental results show that the operation and maintenance efficiency of the power system using IoT power electronics technology has been improved to only 18 h for equipment fault handling.The accuracy of load forecasting optimization control based on IoT power electronics technology reaches 94%.The fault detection accuracy of intelligent monitoring of power equipment based on the power electronics technology of the Internet of Things has reached 96%.At the same time,the Internet of Things power electronics technology was used to improve the power operation mode,so as to promote the monthly electricity sales revenue of 2.77 million RMB.In addition,the effectiveness of IoT power electronics technology in power data security management has reached 95%.In summary,IoT power electronics technology can improve the stability,reliability,and security of power systems,reduce costs,improve efficiency and management level,and has broad application and promotion prospects.
