Chinese Journal of Electrical Engineering最新文献

Minimizing Power Losses in Distribution Networks: A Comprehensive Review 最大限度地减少配电网络的电力损耗：一个全面的回顾

Chinese Journal of Electrical Engineering Pub Date : 2024-12-01 DOI: 10.23919/CJEE.2024.000093

Emad Hussen Sadiq;Rakan Khalil Antar

{"title":"Minimizing Power Losses in Distribution Networks: A Comprehensive Review","authors":"Emad Hussen Sadiq;Rakan Khalil Antar","doi":"10.23919/CJEE.2024.000093","DOIUrl":"https://doi.org/10.23919/CJEE.2024.000093","url":null,"abstract":"The voltage generated by power plants is increased using step-up transformers and then transferred using high-voltage transmission lines. In a distribution system, the voltage is stepped down to certain levels and is utilized by consumers. The losses in distribution networks are very high compared with the transmission line losses because of the high value of the line resistance (R) compared with the reactance (X), high current, and low voltage. Distribution companies have an economic incentive to minimize network losses. Generally, the incentive is the difference between the actual losses and standard losses. Therefore, when the actual losses are greater than the standard losses, distribution companies are fined. If the actual losses are less than the standard losses, distribution companies earn profits. Consequently, the issue of power losses in distribution networks has attracted the attention of researchers. Numerous methods and techniques have been examined and implemented to reduce distribution system losses. These methods differ based on the selection of the loss reduction mechanism, formulation of the problem, technique utilized, and solution obtained. Many techniques are used to minimize losses, such as power factor correction, reconfiguration, distributed generation allocation, load balancing, voltage upgrades, and conductor upgrades. In this study, a literature review, general background on distribution loss minimization, and a comprehensive comparison of the main techniques are presented to examine the best methods for minimizing power losses.","PeriodicalId":36428,"journal":{"name":"Chinese Journal of Electrical Engineering","volume":"10 4","pages":"20-36"},"PeriodicalIF":0.0,"publicationDate":"2024-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://ieeexplore.ieee.org/stamp/stamp.jsp?tp=&arnumber=10820901","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142918116","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}

引用次数: 0

Performance Evaluation of a Multi-input Interleaved Boost Converter with a Tuned Proportional-integral Controller 带调谐比例积分控制器的多输入交错升压变换器的性能评价

Chinese Journal of Electrical Engineering Pub Date : 2024-12-01 DOI: 10.23919/CJEE.2024.000094

Sucharita Pal;Dola Sinha;Mou Das Mahapatra;Saibal Majumder;Sovan Bhattacharya;Chandan Bandyopadhyay

{"title":"Performance Evaluation of a Multi-input Interleaved Boost Converter with a Tuned Proportional-integral Controller","authors":"Sucharita Pal;Dola Sinha;Mou Das Mahapatra;Saibal Majumder;Sovan Bhattacharya;Chandan Bandyopadhyay","doi":"10.23919/CJEE.2024.000094","DOIUrl":"https://doi.org/10.23919/CJEE.2024.000094","url":null,"abstract":"The need for renewable energy access has led to the use of variable input converter approaches because renewable energy sources often generate electricity in an unpredictable manner. A high-performance multi-input boost converter is developed to provide the necessary output voltage and power while accommodating variations in input sources. This converter is specifically designed for the efficient usage of renewable energy. The proposed architecture integrates three separate unidirectional input power sources: photovoltaics, fuel cells, and storage system batteries. The architecture has five switches, and the implementation of each switch in the converter is achieved by applying the calculated duty ratios in various operating states. The closed-loop response of the converter with a proportional-integral (PI) controller-based switching system is examined by analyzing the Matlab-Simulink model utilizing a proportional-integral derivative (PID) tuner. The controller can deliver the desired output voltage of 400 V and an average power of 2 kW while exhibiting low switching transient effects. Therefore, the proposed multi-input interleaved boost converter demonstrates robust results for real-time applications by effectively harnessing renewable power sources.","PeriodicalId":36428,"journal":{"name":"Chinese Journal of Electrical Engineering","volume":"10 4","pages":"119-128"},"PeriodicalIF":0.0,"publicationDate":"2024-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://ieeexplore.ieee.org/stamp/stamp.jsp?tp=&arnumber=10820899","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142918235","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}

引用次数: 0

Sliding-Mode Observer-Based Grid Voltage-Observation Method with Frequency-Fixed Dual SOGI and Cross-Compensated Phase-Locked Loop 基于滑动模式观测器的电网电压观测方法与频率固定的双 SOGI 和交叉补偿锁相环路

Chinese Journal of Electrical Engineering Pub Date : 2024-09-01 DOI: 10.23919/CJEE.2024.000090

Leilei Guo;Qingyang Ye;Nan Jin;Zhenkun Liu;Zhenjun Wu

{"title":"Sliding-Mode Observer-Based Grid Voltage-Observation Method with Frequency-Fixed Dual SOGI and Cross-Compensated Phase-Locked Loop","authors":"Leilei Guo;Qingyang Ye;Nan Jin;Zhenkun Liu;Zhenjun Wu","doi":"10.23919/CJEE.2024.000090","DOIUrl":"https://doi.org/10.23919/CJEE.2024.000090","url":null,"abstract":"Conventional sliding-mode observer (SMO)-based grid-voltage observation methods often require a low-pass filter (LPF) to remove high-frequency sliding-mode noise. However, a complicated phase- and amplitude-compensation method, which is highly sensitive to the DC-offset, is required. A frequency-adaptive dual second-order generalized integrator (SOGI) can be used to replace the LPF, eliminating the compensation link and the effects of the DC-offset; however, strong coupling is introduced between the front-end SOGI block and back-end phase-locked loop (PLL) block, thereby reducing the dynamic performance. To solve this problem, this study proposes an SMO-based grid-voltage observation method with a frequency-fixed dual SOGI and cross-compensated PLL that can eliminate the frequency coupling between the front-end SOGI block and back-end PLL blocks, thereby increasing its dynamic performance. In this study, the phase and amplitude are compensated simultaneously using the proposed cross-compensation method, achieving an accurate observation of the grid voltage under off-nominal frequencies. An analysis of the small-signal model theoretically verified that the proposed method has good dynamic performance. Finally, the superiority of the proposed method is verified through comparative experiments.","PeriodicalId":36428,"journal":{"name":"Chinese Journal of Electrical Engineering","volume":"10 3","pages":"37-49"},"PeriodicalIF":0.0,"publicationDate":"2024-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://ieeexplore.ieee.org/stamp/stamp.jsp?tp=&arnumber=10707126","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142397472","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}

引用次数: 0

Intelligent Energy Management Strategy and Sizing Methodology for Hybrid Systems in Isolated Regions 偏远地区混合动力系统的智能能源管理策略和规模确定方法

Chinese Journal of Electrical Engineering Pub Date : 2024-09-01 DOI: 10.23919/CJEE.2024.000091

Moufida Saadi;Dib Djalel;Billel Meghni;Djamila Rekioua

{"title":"Intelligent Energy Management Strategy and Sizing Methodology for Hybrid Systems in Isolated Regions","authors":"Moufida Saadi;Dib Djalel;Billel Meghni;Djamila Rekioua","doi":"10.23919/CJEE.2024.000091","DOIUrl":"https://doi.org/10.23919/CJEE.2024.000091","url":null,"abstract":"In this study, a comprehensive approach is presented for the sizing and management of hybrid renewable energy systems (HRESs) that incorporate a variety of energy sources, while emphasizing the role of artificial neural networks (ANNs) in system management. For optimal sizing of an HRES, the monthly average method wherein historical weather data are used to calculate the monthly averages of solar irradiance and wind speed, offering a well-balanced strategy for system sizing. This ensures that the HRES is appropriately scaled to meet the actual energy requirements of the specified location, avoiding the pitfalls of over- and under-sizing, and thereby enhancing the operational efficiency. Furthermore, the study details a cutting-edge strategy that employs ANNs for managing the inherent complexities of HRESs. It elaborates on the design, modeling, and control strategies for the HRES components by utilizing Matlab/Simulink for implementation. The findings demonstrate the proficiency of the ANN -based power manager in determining the operational modes guided by a specifically designed flowchart. By integrating ANN-driven energy management strategies into an HRES, the proposed approach marks a significant advancement in system adaptability, precision control, and efficiency, thereby maximizing the effective utilization of renewable resources.","PeriodicalId":36428,"journal":{"name":"Chinese Journal of Electrical Engineering","volume":"10 3","pages":"50-62"},"PeriodicalIF":0.0,"publicationDate":"2024-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://ieeexplore.ieee.org/stamp/stamp.jsp?tp=&arnumber=10707120","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142397473","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}

引用次数: 0

Design-Oriented Transient Stability Assessment for Droop-Controlled Converter Considering Grid Voltage Phase-Angle Jump 考虑电网电压相角跳变的降压控制变流器瞬态稳定性评估--以设计为导向

Chinese Journal of Electrical Engineering Pub Date : 2024-09-01 DOI: 10.23919/CJEE.2024.000092

Pingjuan Ge;Hailiang Xu;Ruitong Mao;Chunming Tu;Fan Xiao;Qi Guo

{"title":"Design-Oriented Transient Stability Assessment for Droop-Controlled Converter Considering Grid Voltage Phase-Angle Jump","authors":"Pingjuan Ge;Hailiang Xu;Ruitong Mao;Chunming Tu;Fan Xiao;Qi Guo","doi":"10.23919/CJEE.2024.000092","DOIUrl":"https://doi.org/10.23919/CJEE.2024.000092","url":null,"abstract":"Droop-controlled voltage-source converters (VSCs) can provide frequency and voltage support to power grids. However, during a grid fault, VSCs may experience transient instability, which can be significantly affected by both the control parameters and fault conditions. This mechanism has not been fully elucidated in previous studies. In particular, grid-voltage faults are commonly accompanied by a grid voltage phase-angle jump (VPAJ), which is typically ignored in the evaluation of the transient stability of VSCs. To address this issue, this study comprehensively assesses the impact of the VPAJ and key control parameters on the transient characteristics of VSCs. Furthermore, the critical clearing angle and critical clearing time are quantitatively calculated to define the transient stability boundary. In addition, a transient stability-enhancement control method that considers the transient stability constraints is proposed. Finally, simulations and experimental tests are conducted to validate both the theoretical analysis and proposed method.","PeriodicalId":36428,"journal":{"name":"Chinese Journal of Electrical Engineering","volume":"10 3","pages":"63-76"},"PeriodicalIF":0.0,"publicationDate":"2024-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://ieeexplore.ieee.org/stamp/stamp.jsp?tp=&arnumber=10707124","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142397128","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}

引用次数: 0

Hybrid Modulation Strategy with Voltage Balancing Control for Four-Level Neutral-Point Clamped Converters 四级中性点钳位转换器的混合调制策略与电压平衡控制

Chinese Journal of Electrical Engineering Pub Date : 2024-09-01 DOI: 10.23919/CJEE.2024.000089

Ning Xie;Wei Zhao;Wenzhi Lin;Zhenglei Wang;Yukai Chen;Chengzhi Li;Jianfei Chen

{"title":"Hybrid Modulation Strategy with Voltage Balancing Control for Four-Level Neutral-Point Clamped Converters","authors":"Ning Xie;Wei Zhao;Wenzhi Lin;Zhenglei Wang;Yukai Chen;Chengzhi Li;Jianfei Chen","doi":"10.23919/CJEE.2024.000089","DOIUrl":"https://doi.org/10.23919/CJEE.2024.000089","url":null,"abstract":"Capacitor voltage imbalance in four-level (4L) neutral-point clamped (NPC) converters is a direct factor hindering their application. In particular, when they are applied in motor drives, space vector pulse-width modulation (SVPWM) is a more popular scheme, but conventional 4L SVPWM cannot achieve the voltage balancing control of DC-link capacitors, is complex to implement, and requires costly computation. A hybrid modulation method with capacitor voltage-balancing control for 4L NPC converters is proposed. The proposed method is achieved using three-level (3L) SVPWM and two-level (2L) carrier-based pulse-width modulation (CPWM) based on the concept of “4L=3L+2L”. Thus, it can be easily implemented on a digital chip because the modulation process is nearly identical to that of 3L SVPWM without the more cumbersome 4L SVPWM algorithm. Meanwhile, any proven optimization scheme of 3L SVPWM can be directly applied to the proposed method to further improve performance. Simulation and experimental results for a 4L active NPC converter demonstrate the effectiveness of the proposed method.","PeriodicalId":36428,"journal":{"name":"Chinese Journal of Electrical Engineering","volume":"10 3","pages":"25-36"},"PeriodicalIF":0.0,"publicationDate":"2024-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://ieeexplore.ieee.org/stamp/stamp.jsp?tp=&arnumber=10707122","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142397126","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}

引用次数: 0

Dynamic Reconstruction of Total-Cross-Tied Photovoltaic Array Based on Arrays Using an Improved Dung Beetle Algorithm 使用改进的蜣螂算法动态重建基于阵列的全交叉光伏阵列

Chinese Journal of Electrical Engineering Pub Date : 2024-09-01 DOI: 10.23919/CJEE.2024.000088

Peijin Liu;Tao Huang;Yong Chen;Lei Dong;Fei Yu

{"title":"Dynamic Reconstruction of Total-Cross-Tied Photovoltaic Array Based on Arrays Using an Improved Dung Beetle Algorithm","authors":"Peijin Liu;Tao Huang;Yong Chen;Lei Dong;Fei Yu","doi":"10.23919/CJEE.2024.000088","DOIUrl":"https://doi.org/10.23919/CJEE.2024.000088","url":null,"abstract":"A dynamic reconfiguration method for photovoltaic (PV) arrays based on an improved dung beetle algorithm (IDBO) to address the issue of PV array mismatch loss caused by partial shading conditions (PSCs) is proposed. To establish the output power-current (P-I) segmentation function for the total-cross-tied (TCT) PV array and the constraint function for the electrical switches, the IDBO algorithm was used to optimize both the P-I segmentation function and the electrical switch constraint function. IDBO is compared with algorithm-free reconfiguration and five other heuristic algorithms using two evaluation criteria: mismatch loss and power enhancement percentage, across six shading scenarios for 6×6 PV arrays. The irradiation distribution of PV arrays reconfigured by IDBO is also presented. The results show that IDBO effectively increases the output power of PV arrays and reduces mismatch loss. The output PV curves tend to exhibit a single peak, and the reconstruction results are superior to those obtained with the other methods.","PeriodicalId":36428,"journal":{"name":"Chinese Journal of Electrical Engineering","volume":"10 3","pages":"77-93"},"PeriodicalIF":0.0,"publicationDate":"2024-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://ieeexplore.ieee.org/stamp/stamp.jsp?tp=&arnumber=10707123","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142397129","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}

引用次数: 0

Novel Modulation Strategy to Achieve Neutral-point Voltage Balance, Common-mode Voltage, and Switching Loss Reduction for Neutral-point Clamped Three-level Inverters 实现中性点箝位三电平逆变器中性点电压平衡、共模电压和开关损耗降低的新型调制策略

Chinese Journal of Electrical Engineering Pub Date : 2024-07-11 DOI: 10.23919/CJEE.2024.000080

Donghan Liu;Jinping Wang;Shengyu Liu;Weidong Jiang

引用次数: 0

A Multitime-Scale Deep Learning Model for Lithium-ion Battery Health Assessment Using Soft Parameter-sharing Mechanism 利用软参数共享机制评估锂离子电池健康状况的多时标深度学习模型

Chinese Journal of Electrical Engineering Pub Date : 2024-07-11 DOI: 10.23919/CJEE.2024.000085

Lulu Wang;Kun Zheng;Yijing Li;Zhipeng Yang;Feifan Zhou;Jia Guo;Jinhao Meng

{"title":"A Multitime-Scale Deep Learning Model for Lithium-ion Battery Health Assessment Using Soft Parameter-sharing Mechanism","authors":"Lulu Wang;Kun Zheng;Yijing Li;Zhipeng Yang;Feifan Zhou;Jia Guo;Jinhao Meng","doi":"10.23919/CJEE.2024.000085","DOIUrl":"https://doi.org/10.23919/CJEE.2024.000085","url":null,"abstract":"Efficient assessment of battery degradation is important to effectively utilize and maintain battery management systems. This study introduces an innovative residual convolutional network (RCN)-gated recurrent unit (GRU) model to accurately assess health of lithium-ion batteries on multiple time scales. The model employs a soft parameter-sharing mechanism to identify both short-and long-term degradation patterns. The continuously looped \u0000<tex>$Q(V), T(V), frac{mathrm{d}Q}{mathrm{d}V}$</tex>\u0000, and \u0000<tex>$frac{mathrm{d}T}{mathrm{d}V}$</tex>\u0000 are extracted to form a four-channel image, from which the RCN can automatically extract the features and the GRU can capture the temporal features. By designing a soft parameter-sharing mechanism, the model can seamlessly predict the capacity and remaining useful life (RUL) on a dual time scale. The proposed method is validated on a large MIT-Stanford dataset comprising 124 cells, showing a high accuracy in terms of mean absolute errors of 0.004 77 for capacity and 83 for RUL. Furthermore, studying the partial voltage fragment reveals the promising performance of the proposed method across various voltage ranges. Specifically, in the partial voltage segment of 2.8-3.2 V, root mean square errors of 0.010 7 for capacity and 140 for RUL are achieved.","PeriodicalId":36428,"journal":{"name":"Chinese Journal of Electrical Engineering","volume":"10 3","pages":"1-11"},"PeriodicalIF":0.0,"publicationDate":"2024-07-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://ieeexplore.ieee.org/stamp/stamp.jsp?tp=&arnumber=10596096","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142397130","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}

引用次数: 0

Sliding Mode Fault-Tolerant Control Based on Fast Convergence Law for Faults of PMSM 基于快速收敛法则的滑模容错控制，用于 PMSM 故障控制

Chinese Journal of Electrical Engineering Pub Date : 2024-07-11 DOI: 10.23919/CJEE.2024.000082

Wan Feng;Mengdi Li;Wenjuan Zhang;Shoudao Huang;Haixia Zhang

{"title":"Sliding Mode Fault-Tolerant Control Based on Fast Convergence Law for Faults of PMSM","authors":"Wan Feng;Mengdi Li;Wenjuan Zhang;Shoudao Huang;Haixia Zhang","doi":"10.23919/CJEE.2024.000082","DOIUrl":"https://doi.org/10.23919/CJEE.2024.000082","url":null,"abstract":"It is difficult for the traditional PI controller to meet high-performance control requirements under the demagnetization fault of a permanent magnet synchronous motor (PMSM). To address this problem, this study proposes a novel sliding mode fault-tolerant control method for PMSM demagnetization faults. First, the mathematical model of PMSM under demagnetization fault state is established, and the reasons for poor fault tolerance of the conventional PI controller are analyzed. A new convergence law is used to design the speed loop sliding mode feedback controller, and its stability is demonstrated. Meanwhile, an adaptive forgetting factor recursive least squares (AFRLS) flux linkage observer is designed to keep the controller parameter values in line with the actual motor parameter values, to reduce the impact of demagnetization faults on motor control performance and achieve fault-tolerant control of demagnetization faults. Finally, simulation and experimental comparison with conventional PI control demonstrate that the proposed method is more robust and resistant to interference.","PeriodicalId":36428,"journal":{"name":"Chinese Journal of Electrical Engineering","volume":"10 3","pages":"147-157"},"PeriodicalIF":0.0,"publicationDate":"2024-07-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://ieeexplore.ieee.org/stamp/stamp.jsp?tp=&arnumber=10596094","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142397474","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}

引用次数: 0