Pub Date : 2025-12-01DOI: 10.23919/CJEE.2025.000113
Shuncheng Liu;Yudong Xie;Zhuohan Jiang;Rongyao Chu;Jiayan Liu;Yong Li;Chang Li
A large proportion of distributed photovoltaic (DPV) and energy storage equipment is gradually being integrated into distribution networks, which increases the complexity of distribution network planning. To achieve flexible and efficient utilization of energy storage and DPV, a distributionally robust optimization expansion planning method for distribution networks based on Kullback-Leibler (KL) divergence is proposed. First, considering the power-flow, radial network, and energy storage constraints, a stochastic optimization planning model is established to minimize the cost of distribution network planning. Subsequently, the fuzzy sets of the DPV output based on KL divergence are embedded into the stochastic optimization planning model. This transforms it into a min-max-min three-level two-stage distributionally robust optimization model that can better balance economy and stability. Finally, the model is solved using the column-and-constraint generation (C&CG) method. The effectiveness and feasibility of the proposed model and algorithm are validated using an improved IEEE 33-node system.
{"title":"Expansion Planning of Photovoltaic-Storage for Distribution Networks Based on Distributionally Robust Optimization","authors":"Shuncheng Liu;Yudong Xie;Zhuohan Jiang;Rongyao Chu;Jiayan Liu;Yong Li;Chang Li","doi":"10.23919/CJEE.2025.000113","DOIUrl":"https://doi.org/10.23919/CJEE.2025.000113","url":null,"abstract":"A large proportion of distributed photovoltaic (DPV) and energy storage equipment is gradually being integrated into distribution networks, which increases the complexity of distribution network planning. To achieve flexible and efficient utilization of energy storage and DPV, a distributionally robust optimization expansion planning method for distribution networks based on Kullback-Leibler (KL) divergence is proposed. First, considering the power-flow, radial network, and energy storage constraints, a stochastic optimization planning model is established to minimize the cost of distribution network planning. Subsequently, the fuzzy sets of the DPV output based on KL divergence are embedded into the stochastic optimization planning model. This transforms it into a min-max-min three-level two-stage distributionally robust optimization model that can better balance economy and stability. Finally, the model is solved using the column-and-constraint generation (C&CG) method. The effectiveness and feasibility of the proposed model and algorithm are validated using an improved IEEE 33-node system.","PeriodicalId":36428,"journal":{"name":"Chinese Journal of Electrical Engineering","volume":"11 4","pages":"163-175"},"PeriodicalIF":3.5,"publicationDate":"2025-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://ieeexplore.ieee.org/stamp/stamp.jsp?tp=&arnumber=11338765","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145915575","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 : 2025-12-01DOI: 10.23919/CJEE.2025.000167
Yongfeng Fang;Yong Yan;Kong Fah Tee
Although numerous research advances have been made on asynchronous motors, particularly regarding internal parameters and complex control methods, the causes of the complex dynamic characteristics observed during normal motor operation have received less attention. To avoid abnormal vibration damage to the motor under normal operating conditions, the fluctuating nonlinear dynamic characteristics of the motor by considering variable voltages, frequencies, and changing workloads from both analytical and numerical perspectives are investigated. Motor stability was evaluated using the Lienard-Chipart stability criterion and the Runge-Kutta method. The results indicate that speed fluctuations occur within a specific range of input voltage and angular frequency, and the amplitude fluctuation region expands when load variation is considered. Furthermore, the Poincare map and Lyapunov exponent are adopted to determine the oscillation distribution and dynamic characteristics in a typical region. Specifically, the chaos phenomenon mostly occurred at the edge of the unstable region with an increase in the load. In contrast, periodic conciliation is mainly concentrated within the unstable region.
{"title":"Analysis of Oscillation Behavior in Asynchronous Motor under External Input Conditions","authors":"Yongfeng Fang;Yong Yan;Kong Fah Tee","doi":"10.23919/CJEE.2025.000167","DOIUrl":"https://doi.org/10.23919/CJEE.2025.000167","url":null,"abstract":"Although numerous research advances have been made on asynchronous motors, particularly regarding internal parameters and complex control methods, the causes of the complex dynamic characteristics observed during normal motor operation have received less attention. To avoid abnormal vibration damage to the motor under normal operating conditions, the fluctuating nonlinear dynamic characteristics of the motor by considering variable voltages, frequencies, and changing workloads from both analytical and numerical perspectives are investigated. Motor stability was evaluated using the Lienard-Chipart stability criterion and the Runge-Kutta method. The results indicate that speed fluctuations occur within a specific range of input voltage and angular frequency, and the amplitude fluctuation region expands when load variation is considered. Furthermore, the Poincare map and Lyapunov exponent are adopted to determine the oscillation distribution and dynamic characteristics in a typical region. Specifically, the chaos phenomenon mostly occurred at the edge of the unstable region with an increase in the load. In contrast, periodic conciliation is mainly concentrated within the unstable region.","PeriodicalId":36428,"journal":{"name":"Chinese Journal of Electrical Engineering","volume":"11 4","pages":"258-265"},"PeriodicalIF":3.5,"publicationDate":"2025-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://ieeexplore.ieee.org/stamp/stamp.jsp?tp=&arnumber=11322777","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145915567","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}
Manufacturing defects in lithium-ion batteries are a major cause of thermal runaway, with copper foreign matter being one of the most common defects on battery production lines. Such defects can induce internal short circuits (ISCs) that may trigger thermal runaway, posing significant safety risks. The occurrence of ISCs in copper defect batteries is closely associated with the charging stages during formation and cycling processes. However, the abnormal characteristics during these processes are not yet fully understood, and existing methods for detecting copper matter in batteries primarily rely on offline self-discharge measurements. In this study, a detailed analysis of abnormal current and voltage characteristics in copper defect batteries during formation and cycling is conducted, a multi-stage defect detection method is proposed. The proposed method achieves detection rates of 84.2% in the formation stage, 84.2% in the single-cycle stage, and 68.4% in the multi-cycle stage. Using this multi-stage detection method, all copper defect batteries, including those prone to sudden ISCs, are successfully identified. Furthermore, the proposed method requires no complex calculations or additional equipment and relies only on standard current and voltage data collected during formation and cycling. This provides an efficient and practical solution for detecting copper foreign matter defects in lithium-ion batteries, thereby enhancing overall battery safety.
{"title":"Detection of Copper Foreign Matter Defects in Lithium-ion Batteries through Abnormal Characteristic during Formation and Cycling Processes","authors":"Wei Chen;Xinjie Sun;Xuebing Han;Weixiang Shen;Rui Xiong","doi":"10.23919/CJEE.2025.000184","DOIUrl":"https://doi.org/10.23919/CJEE.2025.000184","url":null,"abstract":"Manufacturing defects in lithium-ion batteries are a major cause of thermal runaway, with copper foreign matter being one of the most common defects on battery production lines. Such defects can induce internal short circuits (ISCs) that may trigger thermal runaway, posing significant safety risks. The occurrence of ISCs in copper defect batteries is closely associated with the charging stages during formation and cycling processes. However, the abnormal characteristics during these processes are not yet fully understood, and existing methods for detecting copper matter in batteries primarily rely on offline self-discharge measurements. In this study, a detailed analysis of abnormal current and voltage characteristics in copper defect batteries during formation and cycling is conducted, a multi-stage defect detection method is proposed. The proposed method achieves detection rates of 84.2% in the formation stage, 84.2% in the single-cycle stage, and 68.4% in the multi-cycle stage. Using this multi-stage detection method, all copper defect batteries, including those prone to sudden ISCs, are successfully identified. Furthermore, the proposed method requires no complex calculations or additional equipment and relies only on standard current and voltage data collected during formation and cycling. This provides an efficient and practical solution for detecting copper foreign matter defects in lithium-ion batteries, thereby enhancing overall battery safety.","PeriodicalId":36428,"journal":{"name":"Chinese Journal of Electrical Engineering","volume":"11 4","pages":"138-150"},"PeriodicalIF":3.5,"publicationDate":"2025-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://ieeexplore.ieee.org/stamp/stamp.jsp?tp=&arnumber=11338769","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145915625","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}
In order to solve the problem of disturbance rejection and noise suppression of extended state observer (ESO) and high order ESO (HESO), an improved HESO (IHESO) is proposed. First, the ESO and HESO are introduced and their limitations are analyzed. Subsequently, a low-pass filter (LPF) and a new controllable parameter $k$ are introduced into the IHESO, and its internal structure is reconstructed to ensure the reliability of the structure. The introduction of the LPF enhances the ability of noise suppression of IHESO. The introduction of the parameter, $k$, improves the degree of freedom of parameter adjustment, thus helping to separately adjust the disturbance rejection and noise suppression abilities of IHESO. Lastly, the active disturbance rejection control (ADRC) system based on IHESO is verified on an experimental platform. The experimental results show that the IHESO is 5.26% and 31.58% higher than ESO and HESO, respectively, in terms of noise suppression, and 18.29% and 27.79% higher than ESO and HESO, respectively, in terms of disturbance rejection.
{"title":"Active Disturbance Rejection Control Strategy for PMSM Speed Control Based on Improved High-order Extended State Observer","authors":"Yuxin Li;Sheng Huang;Meizhou Yang;Wu Liao;Shoudao Huang","doi":"10.23919/CJEE.2025.000177","DOIUrl":"https://doi.org/10.23919/CJEE.2025.000177","url":null,"abstract":"In order to solve the problem of disturbance rejection and noise suppression of extended state observer (ESO) and high order ESO (HESO), an improved HESO (IHESO) is proposed. First, the ESO and HESO are introduced and their limitations are analyzed. Subsequently, a low-pass filter (LPF) and a new controllable parameter <tex>$k$</tex> are introduced into the IHESO, and its internal structure is reconstructed to ensure the reliability of the structure. The introduction of the LPF enhances the ability of noise suppression of IHESO. The introduction of the parameter, <tex>$k$</tex>, improves the degree of freedom of parameter adjustment, thus helping to separately adjust the disturbance rejection and noise suppression abilities of IHESO. Lastly, the active disturbance rejection control (ADRC) system based on IHESO is verified on an experimental platform. The experimental results show that the IHESO is 5.26% and 31.58% higher than ESO and HESO, respectively, in terms of noise suppression, and 18.29% and 27.79% higher than ESO and HESO, respectively, in terms of disturbance rejection.","PeriodicalId":36428,"journal":{"name":"Chinese Journal of Electrical Engineering","volume":"11 4","pages":"112-124"},"PeriodicalIF":3.5,"publicationDate":"2025-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://ieeexplore.ieee.org/stamp/stamp.jsp?tp=&arnumber=11338767","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145915573","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 : 2025-12-01DOI: 10.23919/CJEE.2025.000174
Zheng Yuan;Liang Chen;Zemin Pan;Wentai Qu
The dual active bridge (DAB) is a widely used DC-DC topology owing to its ease of control and ability to achieve various control objectives. When designing a DAB-based system under broadband perturbations, one must model the DAB, calculate its input impedance, and analyze the system stability. In this study, two continuous-time impedance models of the DAB, i.e., a reduced-order model named the power-based impedance model (PBIM) and a full-order model named the generalized state-space average impedance model (GSSAM), are proposed and used to calculate the input impedance in a single-phase modulation mode. The modeling errors are analyzed, the participation factors and residuals are calculated, and a Bode diagram is constructed to illustrate the change in the input impedance with increasing leakage inductance. Simulations are conducted using various circuit parameters to verify the results. The results show that the PBIM exhibits simplicity and accuracy in the low-frequency domain, whereas the GSSAM performs better in the high-frequency domain.
{"title":"Input Impedance Modeling Method for Dual Active Bridge Converters under Broadband Perturbation","authors":"Zheng Yuan;Liang Chen;Zemin Pan;Wentai Qu","doi":"10.23919/CJEE.2025.000174","DOIUrl":"https://doi.org/10.23919/CJEE.2025.000174","url":null,"abstract":"The dual active bridge (DAB) is a widely used DC-DC topology owing to its ease of control and ability to achieve various control objectives. When designing a DAB-based system under broadband perturbations, one must model the DAB, calculate its input impedance, and analyze the system stability. In this study, two continuous-time impedance models of the DAB, i.e., a reduced-order model named the power-based impedance model (PBIM) and a full-order model named the generalized state-space average impedance model (GSSAM), are proposed and used to calculate the input impedance in a single-phase modulation mode. The modeling errors are analyzed, the participation factors and residuals are calculated, and a Bode diagram is constructed to illustrate the change in the input impedance with increasing leakage inductance. Simulations are conducted using various circuit parameters to verify the results. The results show that the PBIM exhibits simplicity and accuracy in the low-frequency domain, whereas the GSSAM performs better in the high-frequency domain.","PeriodicalId":36428,"journal":{"name":"Chinese Journal of Electrical Engineering","volume":"11 4","pages":"125-137"},"PeriodicalIF":3.5,"publicationDate":"2025-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://ieeexplore.ieee.org/stamp/stamp.jsp?tp=&arnumber=11338774","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145915564","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}
Multiport magnetic network energy routers (MNERs) are a key technology in the energy internet that can improve the consumption level of renewable energy, realize the integration of source-grid-load-storage, and ensure the stable operation of power systems. However, the power grid may break down, causing the grid currents to exceed the safe threshold and the DC bus voltages to fluctuate, thereby threatening the stability of the power system. A coordinated low-voltage ride-through (LVRT) control strategy for an MNER-based grid connection system is proposed. The proposed control strategy can provide significant LVRT capability for an MNER-based grid-connection system and maintain the DC bus voltage of each port at the rated value. A simulation is conducted using the PLECS platform, and the results validate the effectiveness of the proposed coordinated LVRT control strategy.
{"title":"Coordinated Low-voltage Ride-through Control Strategy for Multiport Magnetic Network Energy Routers-based Grid-connection System","authors":"Sayed Abulanwar;Yunqing Hu;Fujin Deng;Yongqing Lv;Liqi Zhong;Abdelhady Ghanem","doi":"10.23919/CJEE.2025.000104","DOIUrl":"https://doi.org/10.23919/CJEE.2025.000104","url":null,"abstract":"Multiport magnetic network energy routers (MNERs) are a key technology in the energy internet that can improve the consumption level of renewable energy, realize the integration of source-grid-load-storage, and ensure the stable operation of power systems. However, the power grid may break down, causing the grid currents to exceed the safe threshold and the DC bus voltages to fluctuate, thereby threatening the stability of the power system. A coordinated low-voltage ride-through (LVRT) control strategy for an MNER-based grid connection system is proposed. The proposed control strategy can provide significant LVRT capability for an MNER-based grid-connection system and maintain the DC bus voltage of each port at the rated value. A simulation is conducted using the PLECS platform, and the results validate the effectiveness of the proposed coordinated LVRT control strategy.","PeriodicalId":36428,"journal":{"name":"Chinese Journal of Electrical Engineering","volume":"11 4","pages":"176-185"},"PeriodicalIF":3.5,"publicationDate":"2025-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://ieeexplore.ieee.org/stamp/stamp.jsp?tp=&arnumber=11338764","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145915599","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 : 2025-12-01DOI: 10.23919/CJEE.2025.000102
Yunyun Chen;Mingjie Lu;Yushan Xu;Xiaoyong Zhu
A serial-parallel asymmetric hybrid permanent magnet (AHPM) motor is proposed to enhance the electromagnetic performance of electric vehicles (EVs). To satisfy the diverse requirements of electromagnetic performance under various operating conditions, variable operating condition weighting optimization based on multifield analysis is implemented. Subsequently, using a field-circuit coupling simulation, the torque performance, loss, efficiency distribution, and anti-demagnetization capability under the corresponding typical operating conditions are analyzed and compared. Finally, the proposed prototype is manufactured and tested. The theoretical analysis and experimental results verified the rationality of the AHPM motor and the effectiveness of the proposed optimization method.
{"title":"Electromagnetic Performance Improvement of Asymmetric Hybrid PM Motor Considering Various Operating Conditions","authors":"Yunyun Chen;Mingjie Lu;Yushan Xu;Xiaoyong Zhu","doi":"10.23919/CJEE.2025.000102","DOIUrl":"https://doi.org/10.23919/CJEE.2025.000102","url":null,"abstract":"A serial-parallel asymmetric hybrid permanent magnet (AHPM) motor is proposed to enhance the electromagnetic performance of electric vehicles (EVs). To satisfy the diverse requirements of electromagnetic performance under various operating conditions, variable operating condition weighting optimization based on multifield analysis is implemented. Subsequently, using a field-circuit coupling simulation, the torque performance, loss, efficiency distribution, and anti-demagnetization capability under the corresponding typical operating conditions are analyzed and compared. Finally, the proposed prototype is manufactured and tested. The theoretical analysis and experimental results verified the rationality of the AHPM motor and the effectiveness of the proposed optimization method.","PeriodicalId":36428,"journal":{"name":"Chinese Journal of Electrical Engineering","volume":"11 4","pages":"186-194"},"PeriodicalIF":3.5,"publicationDate":"2025-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://ieeexplore.ieee.org/stamp/stamp.jsp?tp=&arnumber=11338773","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145915621","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 : 2025-12-01DOI: 10.23919/CJEE.2025.000163
Jie Wu;Shiyun Heng;Jing Yin;Lizhong Bie;Yafei Chen;Jitao Zhang;Zhenjun Wu;Wei Deng
In wireless charging devices, using single inverter to output multiple frequencies can effectively reduce device size and address the frequency incompatibility problem caused by different wireless charging standards. In addition, in the field of consumer electronics, the demand for simultaneous wireless power supply to multiple receivers is becoming increasingly urgent. Receivers that follow different standards require different transmission frequencies, and the generation of multi-frequency signals from single inverter is becoming an indispensable technology. Two methods for generating multi-frequency signals using single inverter, including multi-frequency programmed harmonic modulation (MF-PHM) and multi-frequency multi-amplitude (MFMA) superposition modulation, are investigated. The two methods are compared from the perspectives of system DC voltage utilization rate and inverter output harmonic components. The advantages and disadvantages of each method, together with the underlying mechanisms, are analyzed. Taking the simultaneous generation of 129.5 kHz, 203.5 kHz, and 351.5 kHz by single inverter as an example, a simulation and experimental platform is established to verify the analysis and conclusions. References and guidance for selecting multi-frequency-generation methods using single inverter are provided.
{"title":"Comparative Study on Schemes for Generating Multiple Frequencies with Single Inverter","authors":"Jie Wu;Shiyun Heng;Jing Yin;Lizhong Bie;Yafei Chen;Jitao Zhang;Zhenjun Wu;Wei Deng","doi":"10.23919/CJEE.2025.000163","DOIUrl":"https://doi.org/10.23919/CJEE.2025.000163","url":null,"abstract":"In wireless charging devices, using single inverter to output multiple frequencies can effectively reduce device size and address the frequency incompatibility problem caused by different wireless charging standards. In addition, in the field of consumer electronics, the demand for simultaneous wireless power supply to multiple receivers is becoming increasingly urgent. Receivers that follow different standards require different transmission frequencies, and the generation of multi-frequency signals from single inverter is becoming an indispensable technology. Two methods for generating multi-frequency signals using single inverter, including multi-frequency programmed harmonic modulation (MF-PHM) and multi-frequency multi-amplitude (MFMA) superposition modulation, are investigated. The two methods are compared from the perspectives of system DC voltage utilization rate and inverter output harmonic components. The advantages and disadvantages of each method, together with the underlying mechanisms, are analyzed. Taking the simultaneous generation of 129.5 kHz, 203.5 kHz, and 351.5 kHz by single inverter as an example, a simulation and experimental platform is established to verify the analysis and conclusions. References and guidance for selecting multi-frequency-generation methods using single inverter are provided.","PeriodicalId":36428,"journal":{"name":"Chinese Journal of Electrical Engineering","volume":"11 4","pages":"207-218"},"PeriodicalIF":3.5,"publicationDate":"2025-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://ieeexplore.ieee.org/stamp/stamp.jsp?tp=&arnumber=11338766","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145915601","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}
Power systems operate close to their voltage stability margin owing to the high load demand. To prevent voltage collapse, the system operator must be aware of the system functionality and be prepared to implement preventive and corrective control measures. Hence, an appropriate algorithm to determine the time required by the operator is crucial, making it necessary to adopt appropriate models for effective implementation. Based on the load prediction curve for each bus, a new method is proposed to estimate the remaining time before voltage instability. Furthermore, an algorithm is developed to select the most suitable control action (preventive or corrective) based on the remaining time until the power system voltage instability occurs. In this study, two models based on voltage stability-constrained optimal power flow (VSC-OPF) are proposed, incorporating voltage stability index constraints for both control types. The effectiveness of the proposed algorithm and models is assessed using the IEEE 14- and 57-bus power systems, thereby demonstrating promising results.
{"title":"Coordination of Preventive and Corrective Control for Voltage Stability of Power System","authors":"Hassan Ebrahimi;Mehdi Gholipour;Amin Khodabakhshian","doi":"10.23919/CJEE.2025.000165","DOIUrl":"https://doi.org/10.23919/CJEE.2025.000165","url":null,"abstract":"Power systems operate close to their voltage stability margin owing to the high load demand. To prevent voltage collapse, the system operator must be aware of the system functionality and be prepared to implement preventive and corrective control measures. Hence, an appropriate algorithm to determine the time required by the operator is crucial, making it necessary to adopt appropriate models for effective implementation. Based on the load prediction curve for each bus, a new method is proposed to estimate the remaining time before voltage instability. Furthermore, an algorithm is developed to select the most suitable control action (preventive or corrective) based on the remaining time until the power system voltage instability occurs. In this study, two models based on voltage stability-constrained optimal power flow (VSC-OPF) are proposed, incorporating voltage stability index constraints for both control types. The effectiveness of the proposed algorithm and models is assessed using the IEEE 14- and 57-bus power systems, thereby demonstrating promising results.","PeriodicalId":36428,"journal":{"name":"Chinese Journal of Electrical Engineering","volume":"11 4","pages":"195-206"},"PeriodicalIF":3.5,"publicationDate":"2025-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://ieeexplore.ieee.org/stamp/stamp.jsp?tp=&arnumber=11338772","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145915623","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 : 2025-12-01DOI: 10.23919/CJEE.2025.000153
Yifan Zhang;Guangning Wu;Kai Liu;Hao Yu;Hao Tang;Xining Li
In the actual working process, the contact resistance of transformer bushing electrical connection parts increases due to temperature changes, vibration excitation, and other factors, thereby causing the failure of the connection parts. Therefore, ensuring the normal operation of the casing electrical connection parts to realize the stability and reliability of the DC transmission system. In this review, we summarize the previous studies conducted in this field in recent years and expound on the current status of the research conducted on the contact resistance of bushing electrical connection components, considering the mechanism of the electrical contact degradation of transformer bushing electrical connection components, main factors influencing the connection failure, experimental and simulation methods, and future outlook. Additionally, we discussed the typical issues faced in this field to provide new research directions, along with useful design insights for engineers.
{"title":"Review on Failure of Electrical Connection Components of Transformer Bushing","authors":"Yifan Zhang;Guangning Wu;Kai Liu;Hao Yu;Hao Tang;Xining Li","doi":"10.23919/CJEE.2025.000153","DOIUrl":"https://doi.org/10.23919/CJEE.2025.000153","url":null,"abstract":"In the actual working process, the contact resistance of transformer bushing electrical connection parts increases due to temperature changes, vibration excitation, and other factors, thereby causing the failure of the connection parts. Therefore, ensuring the normal operation of the casing electrical connection parts to realize the stability and reliability of the DC transmission system. In this review, we summarize the previous studies conducted in this field in recent years and expound on the current status of the research conducted on the contact resistance of bushing electrical connection components, considering the mechanism of the electrical contact degradation of transformer bushing electrical connection components, main factors influencing the connection failure, experimental and simulation methods, and future outlook. Additionally, we discussed the typical issues faced in this field to provide new research directions, along with useful design insights for engineers.","PeriodicalId":36428,"journal":{"name":"Chinese Journal of Electrical Engineering","volume":"11 4","pages":"1-18"},"PeriodicalIF":3.5,"publicationDate":"2025-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://ieeexplore.ieee.org/stamp/stamp.jsp?tp=&arnumber=11338770","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145915613","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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