Pub Date : 2024-07-11DOI: 10.23919/CJEE.2024.000081
Ming Li;Xing Zhang;Xinxin Fu;Hua Geng;Wei Zhao
The integration of photovoltaic (PV) systems into weak-grid environments presents unique challenges to the stability of grid-connected inverters. This review provides a comprehensive overview of the research efforts focused on investigating the stability of PV grid-connected inverters that operate under weak grid conditions. Weak grids are characterized by a low short-circuit capacity and low inertia, making it essential to explore strategies that enhance the stability and performance of inverters in such challenging environments. This review covers various aspects, including control strategies and advanced technologies implemented to address stability problems. The research findings related to the impact of weak grid conditions on PV inverters, modeling techniques, and analysis results are discussed. Additionally, this review highlights emerging trends, identifies gaps in the current research, and suggests potential avenues for future investigations aimed at improving the stability of PV grid-connected inverters in weak grid scenarios.
{"title":"Stability Studies on PV Grid-connected Inverters under Weak Grid: A Review","authors":"Ming Li;Xing Zhang;Xinxin Fu;Hua Geng;Wei Zhao","doi":"10.23919/CJEE.2024.000081","DOIUrl":"https://doi.org/10.23919/CJEE.2024.000081","url":null,"abstract":"The integration of photovoltaic (PV) systems into weak-grid environments presents unique challenges to the stability of grid-connected inverters. This review provides a comprehensive overview of the research efforts focused on investigating the stability of PV grid-connected inverters that operate under weak grid conditions. Weak grids are characterized by a low short-circuit capacity and low inertia, making it essential to explore strategies that enhance the stability and performance of inverters in such challenging environments. This review covers various aspects, including control strategies and advanced technologies implemented to address stability problems. The research findings related to the impact of weak grid conditions on PV inverters, modeling techniques, and analysis results are discussed. Additionally, this review highlights emerging trends, identifies gaps in the current research, and suggests potential avenues for future investigations aimed at improving the stability of PV grid-connected inverters in weak grid scenarios.","PeriodicalId":36428,"journal":{"name":"Chinese Journal of Electrical Engineering","volume":"10 4","pages":"1-19"},"PeriodicalIF":0.0,"publicationDate":"2024-07-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://ieeexplore.ieee.org/stamp/stamp.jsp?tp=&arnumber=10596093","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142918574","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2024-07-11DOI: 10.23919/CJEE.2024.000084
Man Chen;Hongtao Zhu;Yumin Peng;Xuan Wang;Xuefeng Zhang;Yijun Xiong;Lianfu Chen;Yikai Li;Bushi Zhao
With the establishment of “carbon peaking and carbon neutrality” goals in China, along with the development of new power systems and ongoing electricity market reforms, pumped-storage power stations (PSPSs) will increasingly play a significant role in power systems. Therefore, this study focuses on trading and bidding strategies for PSPSs in the electricity market. Firstly, a comprehensive framework for PSPSs participating in the electricity energy and frequency regulation (FR) ancillary service market is proposed. Subsequently, a two-layer trading model is developed to achieve joint clearing in the energy and frequency regulation markets. The upper-layer model aims to maximize the revenue of the power station by optimizing the bidding strategies using a Q-learning algorithm. The lower-layer model minimized the total electricity purchasing cost of the system. Finally, the proposed bi-level trading model is validated by studying an actual case in which data are obtained from a provincial power system in China. The results indicate that through this decision-making method, PSPSs can achieve higher economic revenue in the market, which will provide a reference for the planning and operation of PSPSs.
{"title":"Decision-making Method for Pumped Storage Power Stations in the Electricity Energy and Frequency Regulation Markets","authors":"Man Chen;Hongtao Zhu;Yumin Peng;Xuan Wang;Xuefeng Zhang;Yijun Xiong;Lianfu Chen;Yikai Li;Bushi Zhao","doi":"10.23919/CJEE.2024.000084","DOIUrl":"https://doi.org/10.23919/CJEE.2024.000084","url":null,"abstract":"With the establishment of “carbon peaking and carbon neutrality” goals in China, along with the development of new power systems and ongoing electricity market reforms, pumped-storage power stations (PSPSs) will increasingly play a significant role in power systems. Therefore, this study focuses on trading and bidding strategies for PSPSs in the electricity market. Firstly, a comprehensive framework for PSPSs participating in the electricity energy and frequency regulation (FR) ancillary service market is proposed. Subsequently, a two-layer trading model is developed to achieve joint clearing in the energy and frequency regulation markets. The upper-layer model aims to maximize the revenue of the power station by optimizing the bidding strategies using a Q-learning algorithm. The lower-layer model minimized the total electricity purchasing cost of the system. Finally, the proposed bi-level trading model is validated by studying an actual case in which data are obtained from a provincial power system in China. The results indicate that through this decision-making method, PSPSs can achieve higher economic revenue in the market, which will provide a reference for the planning and operation of PSPSs.","PeriodicalId":36428,"journal":{"name":"Chinese Journal of Electrical Engineering","volume":"10 4","pages":"60-72"},"PeriodicalIF":0.0,"publicationDate":"2024-07-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://ieeexplore.ieee.org/stamp/stamp.jsp?tp=&arnumber=10596095","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142918573","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2024-06-13DOI: 10.23919/CJEE.2024.000076
Jinru Huang;Zhihong Xu;Liwei Du
A reconstruction method using experimental arc fault data to improve the testing efficiency of protection devices is introduced. By establishing an arc-current database and employing collaborative control of data and circuit feedback signals, the electronic load can be precisely regulated enabling arc fault currents to be reproduced in real-world circuits. To address the frequency mismatches caused by power frequency fluctuations, an adaptive correction control strategy is proposed to eliminate waveform distortions in the reconstructed arc current. Simulations and experiments confirmed the consistency between the arc data and reconstructed current signals, and the method's feasibility was further validated by testing six arc-fault protection devices from different manufacturers.
{"title":"Method for Reconstructing Arc Fault Current Signals and an Adaptive Correction Strategy","authors":"Jinru Huang;Zhihong Xu;Liwei Du","doi":"10.23919/CJEE.2024.000076","DOIUrl":"https://doi.org/10.23919/CJEE.2024.000076","url":null,"abstract":"A reconstruction method using experimental arc fault data to improve the testing efficiency of protection devices is introduced. By establishing an arc-current database and employing collaborative control of data and circuit feedback signals, the electronic load can be precisely regulated enabling arc fault currents to be reproduced in real-world circuits. To address the frequency mismatches caused by power frequency fluctuations, an adaptive correction control strategy is proposed to eliminate waveform distortions in the reconstructed arc current. Simulations and experiments confirmed the consistency between the arc data and reconstructed current signals, and the method's feasibility was further validated by testing six arc-fault protection devices from different manufacturers.","PeriodicalId":36428,"journal":{"name":"Chinese Journal of Electrical Engineering","volume":"10 4","pages":"129-140"},"PeriodicalIF":0.0,"publicationDate":"2024-06-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://ieeexplore.ieee.org/stamp/stamp.jsp?tp=&arnumber=10557518","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142918121","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2024-06-13DOI: 10.23919/CJEE.2024.000065
Tongming Li;Fei Gao;Yigeng Huangfu
Energy shortages have hindered global economic development. By utilizing waste as a substrate for microbial fermentation, hydrogen production can transform waste into a valuable resource, significantly reducing the cost of hydrogen production and addressing a significant hurdle in achieving large-scale production of microbial hydrogen. This approach has significant potential for future hydrogen-production applications. Two-stage indirect photohydrolysis has recently emerged as a promising and efficient method for hydrogen production using cyanobacteria and green algae. However, this method cannot be directly applied to organic wastewater for hydrogen production. In contrast, dark fermentation by bacteria, particularly ethanol-type fermentation, is highly efficient for producing hydrogen. Therefore, the combination of the indirect photohydrolysis of algae and dark fermentation by bacteria is expected to significantly enhance the hydrogen-production capacity of organic wastewater, laying the groundwork for future large-scale microbial hydrogen production. This study reviews the main types and technical principles of microbial hydrogen production from waste, available waste types, research progress in the microbial hydrogen-production process, strategies to improve the hydrogen-production rate, and challenges faced during industrialization. Future research directions for microbial-waste hydrogen production are also proposed. The aim of this study is to provide a valuable reference for large-scale biological hydrogen-production research.
{"title":"Biological Hydrogen Production: A Comprehensive Review for Converting Wastes into Wealth","authors":"Tongming Li;Fei Gao;Yigeng Huangfu","doi":"10.23919/CJEE.2024.000065","DOIUrl":"https://doi.org/10.23919/CJEE.2024.000065","url":null,"abstract":"Energy shortages have hindered global economic development. By utilizing waste as a substrate for microbial fermentation, hydrogen production can transform waste into a valuable resource, significantly reducing the cost of hydrogen production and addressing a significant hurdle in achieving large-scale production of microbial hydrogen. This approach has significant potential for future hydrogen-production applications. Two-stage indirect photohydrolysis has recently emerged as a promising and efficient method for hydrogen production using cyanobacteria and green algae. However, this method cannot be directly applied to organic wastewater for hydrogen production. In contrast, dark fermentation by bacteria, particularly ethanol-type fermentation, is highly efficient for producing hydrogen. Therefore, the combination of the indirect photohydrolysis of algae and dark fermentation by bacteria is expected to significantly enhance the hydrogen-production capacity of organic wastewater, laying the groundwork for future large-scale microbial hydrogen production. This study reviews the main types and technical principles of microbial hydrogen production from waste, available waste types, research progress in the microbial hydrogen-production process, strategies to improve the hydrogen-production rate, and challenges faced during industrialization. Future research directions for microbial-waste hydrogen production are also proposed. The aim of this study is to provide a valuable reference for large-scale biological hydrogen-production research.","PeriodicalId":36428,"journal":{"name":"Chinese Journal of Electrical Engineering","volume":"10 3","pages":"110-134"},"PeriodicalIF":0.0,"publicationDate":"2024-06-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://ieeexplore.ieee.org/stamp/stamp.jsp?tp=&arnumber=10557517","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142397124","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2024-06-13DOI: 10.23919/CJEE.2024.000073
Xuefeng Yu;Xiaoyong Zhu;Li Quan;Zixuan Xiang;Deyang Fan
With the increasing complexity of electrical vehicles (EVs), the wide-speed-range high-efficiency characteristics of EV drive motors are in strict demand. In this study, the variable magnetic flux effect is introduced into a permanent magnet (PM) motor, and a variable magnetic flux permanent magnetic (VMF-PM) motor is proposed. First, the flux is adjusted flexibly to synchronously broaden the speed regulation range and high-efficiency region. Subsequently, an efficiency analytical model is developed considering the motor speed, current, and flux variations. It is indicated that by the purposeful design of the variable flux leakage topology, the efficiency under high speed can be improved based on a theoretical investigation of the high-efficiency boundary. In addition, based on finite element analysis, the performances before and after optimization of the key parameters of the VMF-PM motor are investigated, including the flux variable characteristics and efficiency characteristics. Finally, a prototype motor is built and tested. Both theoretical analysis and experimental results confirm that based on the assistance of the variable magnetic flux effect, the motor high-efficiency region is broadened effectively, providing a potential research path for designing a wide-speed-range high-efficiency motor.
{"title":"Investigation and Regulation of High-Efficiency Region Boundary of Variable Magnetic Flux Permanent Magnet Motor","authors":"Xuefeng Yu;Xiaoyong Zhu;Li Quan;Zixuan Xiang;Deyang Fan","doi":"10.23919/CJEE.2024.000073","DOIUrl":"https://doi.org/10.23919/CJEE.2024.000073","url":null,"abstract":"With the increasing complexity of electrical vehicles (EVs), the wide-speed-range high-efficiency characteristics of EV drive motors are in strict demand. In this study, the variable magnetic flux effect is introduced into a permanent magnet (PM) motor, and a variable magnetic flux permanent magnetic (VMF-PM) motor is proposed. First, the flux is adjusted flexibly to synchronously broaden the speed regulation range and high-efficiency region. Subsequently, an efficiency analytical model is developed considering the motor speed, current, and flux variations. It is indicated that by the purposeful design of the variable flux leakage topology, the efficiency under high speed can be improved based on a theoretical investigation of the high-efficiency boundary. In addition, based on finite element analysis, the performances before and after optimization of the key parameters of the VMF-PM motor are investigated, including the flux variable characteristics and efficiency characteristics. Finally, a prototype motor is built and tested. Both theoretical analysis and experimental results confirm that based on the assistance of the variable magnetic flux effect, the motor high-efficiency region is broadened effectively, providing a potential research path for designing a wide-speed-range high-efficiency motor.","PeriodicalId":36428,"journal":{"name":"Chinese Journal of Electrical Engineering","volume":"10 3","pages":"135-146"},"PeriodicalIF":0.0,"publicationDate":"2024-06-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://ieeexplore.ieee.org/stamp/stamp.jsp?tp=&arnumber=10557492","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142397475","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Dual three-phase permanent magnet synchronous generator (DTP-PMSG) offers high efficiency and power density, and is suitable for high-reliability applications. To improve the voltage response of traditional linear active disturbance rejection voltage regulators in noisy environments, a voltage control method based on cascaded linear active disturbance rejection controllers is proposed. A low-pass filter is often used to filter noise in bus voltage signals, resulting in phase and amplitude losses. Therefore, in the proposed method, the output and filtering losses of the low-pass filter are defined as new system state variables. Subsequently, a cascaded linear active disturbance rejection controller is introduced to estimate the system state variables and compensate for filtering loss. Compared to the traditional linear active disturbance rejection voltage controller, the proposed method can effectively shorten the voltage recovery time and improve the anti-interference performance. Simulation and experimental results demonstrate the feasibility and effectiveness of the proposed control strategy.
{"title":"Voltage Stabilization Control for Dual Three-phase Permanent Magnet Synchronous Generator Based on Cascaded Linear Active Disturbance Rejection Control","authors":"Chao Cheng;Yang He;Tao Tao;Huanan Wang;Wenxiang Zhao","doi":"10.23919/CJEE.2024.000066","DOIUrl":"https://doi.org/10.23919/CJEE.2024.000066","url":null,"abstract":"Dual three-phase permanent magnet synchronous generator (DTP-PMSG) offers high efficiency and power density, and is suitable for high-reliability applications. To improve the voltage response of traditional linear active disturbance rejection voltage regulators in noisy environments, a voltage control method based on cascaded linear active disturbance rejection controllers is proposed. A low-pass filter is often used to filter noise in bus voltage signals, resulting in phase and amplitude losses. Therefore, in the proposed method, the output and filtering losses of the low-pass filter are defined as new system state variables. Subsequently, a cascaded linear active disturbance rejection controller is introduced to estimate the system state variables and compensate for filtering loss. Compared to the traditional linear active disturbance rejection voltage controller, the proposed method can effectively shorten the voltage recovery time and improve the anti-interference performance. Simulation and experimental results demonstrate the feasibility and effectiveness of the proposed control strategy.","PeriodicalId":36428,"journal":{"name":"Chinese Journal of Electrical Engineering","volume":"10 4","pages":"37-46"},"PeriodicalIF":0.0,"publicationDate":"2024-06-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://ieeexplore.ieee.org/stamp/stamp.jsp?tp=&arnumber=10557516","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142918120","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2024-06-13DOI: 10.23919/CJEE.2024.000078
Wentao Zhang;Haiyang Gao;Yongxiang Xu;Jibin Zou
Permanent magnet synchronous motors (PMSMs) driven by voltage source inverters (VSIs) with pulse width modulation (PWM) are widely used. Given the impact of acoustic noise on the environment and human ears, the comfort level of the high-frequency vibration noise emitted by PMSMs has become an important factor. This study introduces the current mainstream high-frequency vibration noise suppression strategies for PMSMs by reducing the high-frequency current harmonics of stator windings, including spread spectrum technology, vector position exchange technology, and interleaved parallel technology. Furthermore, this study analyzed and compared the advantages and disadvantages of various suppression strategies.
{"title":"Review of High-Frequency PWM Acoustic Noise Suppression Methods for PMSMs","authors":"Wentao Zhang;Haiyang Gao;Yongxiang Xu;Jibin Zou","doi":"10.23919/CJEE.2024.000078","DOIUrl":"https://doi.org/10.23919/CJEE.2024.000078","url":null,"abstract":"Permanent magnet synchronous motors (PMSMs) driven by voltage source inverters (VSIs) with pulse width modulation (PWM) are widely used. Given the impact of acoustic noise on the environment and human ears, the comfort level of the high-frequency vibration noise emitted by PMSMs has become an important factor. This study introduces the current mainstream high-frequency vibration noise suppression strategies for PMSMs by reducing the high-frequency current harmonics of stator windings, including spread spectrum technology, vector position exchange technology, and interleaved parallel technology. Furthermore, this study analyzed and compared the advantages and disadvantages of various suppression strategies.","PeriodicalId":36428,"journal":{"name":"Chinese Journal of Electrical Engineering","volume":"10 3","pages":"94-109"},"PeriodicalIF":0.0,"publicationDate":"2024-06-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://ieeexplore.ieee.org/stamp/stamp.jsp?tp=&arnumber=10557519","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142397476","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2024-06-13DOI: 10.23919/CJEE.2024.000077
Yuanxi Chen;Weinong Fu;Shuangxia Niu;Hongjian Lin
Isolation-dependent applications require a transformer with high efficiency, low magnetizing current, and anti-DC bias capability. The kilohertz planar negative magnetic reluctance structure is used to achieve this target with its magnetic-frequency variation property, which reduces the magnetic reluctance of the fundamental component. However, this design cannot be applied to low-frequency transformers owing to the high loss caused by its limited self-inductance and quality factor. To solve this problem, a pole-wrapped negative equivalent magnetic reluctance (PNEMR) structure is presented. The proposed design employed a copper-based PNEMR structure wrapped around the magnetic poles to enhance the fundamental flux and suppress the DC component of flux. Accordingly, the magnetizing current is reduced, and the isolation transformer is less susceptible to the DC bias. The proposed design can simultaneously improve the anti-DC magnetic bias capability, efficiency, and power factor of the transformers. To verify the effectiveness of the proposed design, a 10 kW C-core PNEMR structure-based transformer for isolation-dependent applications was constructed and compared to the generalized structures and transformers with planar negative magnetic reluctance structures. Results indicate that the PNEMR-based transformer can enhance the efficiency and power factor from 96.1% and 0.87 to 96.6% and 0.93, respectively, under full load conditions.
{"title":"Pole-Wrapped Negative Equivalent Magnetic Reluctance Structure-Based Transformer for Line-Frequency Isolation-Dependent Applications","authors":"Yuanxi Chen;Weinong Fu;Shuangxia Niu;Hongjian Lin","doi":"10.23919/CJEE.2024.000077","DOIUrl":"https://doi.org/10.23919/CJEE.2024.000077","url":null,"abstract":"Isolation-dependent applications require a transformer with high efficiency, low magnetizing current, and anti-DC bias capability. The kilohertz planar negative magnetic reluctance structure is used to achieve this target with its magnetic-frequency variation property, which reduces the magnetic reluctance of the fundamental component. However, this design cannot be applied to low-frequency transformers owing to the high loss caused by its limited self-inductance and quality factor. To solve this problem, a pole-wrapped negative equivalent magnetic reluctance (PNEMR) structure is presented. The proposed design employed a copper-based PNEMR structure wrapped around the magnetic poles to enhance the fundamental flux and suppress the DC component of flux. Accordingly, the magnetizing current is reduced, and the isolation transformer is less susceptible to the DC bias. The proposed design can simultaneously improve the anti-DC magnetic bias capability, efficiency, and power factor of the transformers. To verify the effectiveness of the proposed design, a 10 kW C-core PNEMR structure-based transformer for isolation-dependent applications was constructed and compared to the generalized structures and transformers with planar negative magnetic reluctance structures. Results indicate that the PNEMR-based transformer can enhance the efficiency and power factor from 96.1% and 0.87 to 96.6% and 0.93, respectively, under full load conditions.","PeriodicalId":36428,"journal":{"name":"Chinese Journal of Electrical Engineering","volume":"10 3","pages":"12-24"},"PeriodicalIF":0.0,"publicationDate":"2024-06-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://ieeexplore.ieee.org/stamp/stamp.jsp?tp=&arnumber=10557491","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142397125","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2024-06-13DOI: 10.23919/CJEE.2024.000074
Wenqi Ge;Xiaotong Wang
With the further deepening of power market reform, flexible loads have become the focus of attention for power supply and demand. In the context of new power systems, it is necessary to consider the potential of flexible load dispatch on the side of the customer for power demand response research. Based on this, a typical flexible load is selected in the community, and an economic model with minimum cost is established as the objective function. This model is used to regulate the power load curve and achieve valley filling and peak shaving. Additionally, considering different weather conditions, the calculation example analyzes the effect of flexible load participation in regulation under various environments and combines the time-of-use tariff for dispatch. The results can flexibly and effectively guide users to participate in demand response, reduce economic input on the user side, and meet the higher requirements of flexible demand-side regulation resources to support the safe operation of the power system, which has certain application potential and economic value.
{"title":"Study of Source-load Interaction in Demand Response Considering the Potential of Flexible Load Dispatch","authors":"Wenqi Ge;Xiaotong Wang","doi":"10.23919/CJEE.2024.000074","DOIUrl":"https://doi.org/10.23919/CJEE.2024.000074","url":null,"abstract":"With the further deepening of power market reform, flexible loads have become the focus of attention for power supply and demand. In the context of new power systems, it is necessary to consider the potential of flexible load dispatch on the side of the customer for power demand response research. Based on this, a typical flexible load is selected in the community, and an economic model with minimum cost is established as the objective function. This model is used to regulate the power load curve and achieve valley filling and peak shaving. Additionally, considering different weather conditions, the calculation example analyzes the effect of flexible load participation in regulation under various environments and combines the time-of-use tariff for dispatch. The results can flexibly and effectively guide users to participate in demand response, reduce economic input on the user side, and meet the higher requirements of flexible demand-side regulation resources to support the safe operation of the power system, which has certain application potential and economic value.","PeriodicalId":36428,"journal":{"name":"Chinese Journal of Electrical Engineering","volume":"10 4","pages":"141-151"},"PeriodicalIF":0.0,"publicationDate":"2024-06-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://ieeexplore.ieee.org/stamp/stamp.jsp?tp=&arnumber=10557515","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142918117","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
A thermoelectric generator (TEG) is a one of thermo electric conversion device that operates based on the heat difference between the two surfaces of a device. In a TEG, the power generation varies owing to various ambiences, sources, and loads. These variables make it difficult to draw available power from the device, leading to poor utilization of the TEG. To overcome these drawbacks, maximum power tracking technique (MPPT) can be employed in TEG. A modified PEMPPT scheme is developed to track the maximum power point (MPP) when there is a change in the operating conditions, and is based on a parabolic curve of the power current characteristics of the TEG. The proposed algorithm is developed by considering two features. First, the reduction in tracking time by a sample compared with the PEMPPT algorithm by considering a new shifted point as the first duty. Second, the sign of the voltage is checked to limit the voltage, current, and power by applying the next duties close to the MPP. The proposed system is simulated and experimentally verified using a laboratory prototype. The simulation and experimental results show that the tracking time of the proposed algorithm is almost 3/4th of PEMPPT.
{"title":"Modified Parabolic Extrapolation Based Maximum Power Point Tracking of Thermoelectric Generator for Dynamic Conditions","authors":"Adithya Chepuru;Saravanakumar Rajendran;Prabhakaran Koothu Kesavan","doi":"10.23919/CJEE.2024.000079","DOIUrl":"https://doi.org/10.23919/CJEE.2024.000079","url":null,"abstract":"A thermoelectric generator (TEG) is a one of thermo electric conversion device that operates based on the heat difference between the two surfaces of a device. In a TEG, the power generation varies owing to various ambiences, sources, and loads. These variables make it difficult to draw available power from the device, leading to poor utilization of the TEG. To overcome these drawbacks, maximum power tracking technique (MPPT) can be employed in TEG. A modified PEMPPT scheme is developed to track the maximum power point (MPP) when there is a change in the operating conditions, and is based on a parabolic curve of the power current characteristics of the TEG. The proposed algorithm is developed by considering two features. First, the reduction in tracking time by a sample compared with the PEMPPT algorithm by considering a new shifted point as the first duty. Second, the sign of the voltage is checked to limit the voltage, current, and power by applying the next duties close to the MPP. The proposed system is simulated and experimentally verified using a laboratory prototype. The simulation and experimental results show that the tracking time of the proposed algorithm is almost 3/4th of PEMPPT.","PeriodicalId":36428,"journal":{"name":"Chinese Journal of Electrical Engineering","volume":"10 4","pages":"97-105"},"PeriodicalIF":0.0,"publicationDate":"2024-06-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://ieeexplore.ieee.org/stamp/stamp.jsp?tp=&arnumber=10557514","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142918119","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
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