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Challenges and Improvements of Wind Power dispatch in northwest China

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电力系统自动化 2012年第8期36卷 166-170页

作者： Geng, Jian Peng, Mingqiao Zhang, Kaifeng Gao, Zonghe Dai, Zemei Bai, Xingzhong state grid Electric Power Research Institute Nanjing 210003 China Electric Power Research Institute of China Beijing 100192 China northwest state grid dispatch center Xi'an 710048 China School of Automation Southeast University Nanjing 210018 China

Besides common characteristics of wind power,there are some special characteristics in China power system,including large-scale,long distance transmission and lack of flexible regulating power *** special characteristics make power dispatch more challenging in *** studies have been carried out and some improvements are presented including wind power monitoring and control as well as evaluation of wind power integration *** a demonstration project,the technologies are integrated into the energy management system and are implemented in the northwest China power *** provide effective measures for wind power dispatch in the grid.

关键词：中国西北地区风力发电发电调度能源管理系统电力系统电力调度长距离传输集成能力

Clustering Analysis of Black-start Decision-making with a Large Group of Decision-makers

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电力系统自动化 2012年第8期36卷 154-160页

作者： Liu, Weijia Lin, Zhenzhi Wen, Fushuan Xue, Yusheng Dai, Yan Sun, Weizhen Wang, Chao Zhejiang University Hangzhou 310027 China state grid Electric Power Research Institute Nanjing 210003 China Zhejiang Electric Power dispatch and Communication center Hangzhou 310007 China

The optimization of black-start decision-making plays an important role in the rapid restoration of a power system after a major failure/*** the introduction of the concept of smart grids and the development of real-time communication networks,the black-start decision-makers are no longer limited to only one or a few power system experts such as dispatchers,but rather a large group of professional people in *** overall behaviors of a large decision-making group of decision-makers/experts are more complicated and ***,the existing methods for black-start decision-making cannot handle the situations with a large group of *** this background,a clustering algorithm is presented to optimize the black-start decision-making problem with a large group of *** decision-making preferences are obtained by clustering analysis,and the final black-start decision-making results are achieved by combining the weights of black-start indexes and the preferences of the decision-making *** effectiveness of the proposed method is validated by a practical *** work extends the black-start decision-making problem to situations with a large group of decision-makers.

关键词：决策者聚类分析黑启动大集实时通信网络决策问题电力系统电源系统

Coordinated Optimization of Multi-energy Generation Systems Considering the Health Damages of Coal-fired Pollutant Dispersion

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CSEE Journal of Power and Energy Systems 2022年第6期8卷 1613-1622页

作者： Suhua Lou Yinhao Yang Yanjie Liang Yaowu Wu state Key Laboratory of Advanced Electromagnetic Engineering and Technology Huazhong University of Science and TechnologyWuhan 430074China Power dispatch and Control center of China Southern Power grid Guangzhou 510623China

Pollutants emitted from coal-fired power plants lead to the deterioration of air quality in developing countries,and contribute to both mortality and *** improve air quality from power generation,new dispatch strategies incorporated with air pollution dispersion models should be *** paper takes into account the impact of meteorological variations on spatio-temporal dispersion of *** on the coal-fired pollutant concentration estimated by the Gaussian plume dispersion model,exposure-response functions are used to quantify the resulting health ***,the corresponding economic costs of health damages are incorporated to penalize the power *** generation costs and economic costs of health damages,this paper formulates a twostage stochastic optimization model of a multi-energy generation system including coal units,gas units,and photovoltaic ***,numerical studies based on a modified IEEE 14-node system are performed for illustration and validation.

关键词： Coal-fired pollutant dispersion exposure-response functions Gaussian plume model meteorological variations multi-energy generation system

Multi-Lever EarlyWarning forWind and Photovoltaic Power Ramp Events Based on Neural Network and Fuzzy Logic

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Energy Engineering 2024年第11期121卷 3133-3160页

作者： Huan Ma Linlin Ma Zengwei Wang Zhendong Li Yuanzhen Zhu Yutian Liu Power grid Technology center State Grid Shandong Electric Power Research InstituteJinan250003China Shandong Electric Power dispatching and Control center State Grid Shandong Electric Power CompanyJinan250012China Key Laboratory of Power System Intelligent dispatch and Control of Ministry of Education Shandong UniversityJinan250061China

With the increasing penetration of renewable energy in power system,renewable energy power ramp events(REPREs),dominated by wind power and photovoltaic power,pose significant threats to the secure and stable operation of power *** paper presents an early warning method for REPREs based on long short-term memory(LSTM)network and fuzzy ***,the warning levels of REPREs are defined by assessing the control costs of various power control ***,the next 4-h power support capability of external grid is estimated by a tie line power predictionmodel,which is constructed based on the ***,considering the risk attitudes of dispatchers,fuzzy rules are employed to address the boundary value attribution of the early warning interval,improving the rationality of power ramp event early *** results demonstrate that the proposed method can generate reasonable early warning levels for REPREs,guiding decision-making for control strategy.

关键词： Early warning machine learning power system security renewable energy power ramp event smart grid

Integrated resources planning in microgrids considering interruptible loads and shiftable loads

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Journal of Modern Power Systems and Clean Energy 2018年第4期6卷 802-815页

作者： Lan ZHU Xueying ZHOU Xiao-Ping ZHANG Zheng YAN Shuxin GUO Longjun TANG Department of Electrical Engineering Shanghai Jiao Tong University School of Electrical Engineering Shanghai University of Electric Power Pudong Power Supply Company State Grid Shanghai Municipal Electric Power Company School of Electronic Electrical and Systems EngineeringUniversity of Birmingham Zibo Power Supply Company State Grid Shandong Electric Power Grid Company East Electric Power dispatch and Control Sub-center State Grid Corporation of China

Demand response has the potential to bring significant benefits to the optimal sizing of distributed generation(DG) resources for microgrids planning. This paper presents an integrated resources planning model considering the impact of interruptible loads(ILs) and shiftable loads(SLs) in microgrids, which simultaneouslydeals with supply side and demand side resources and minimizes the overall planning cost of the microgrid. The proposed model can be applied to offer a quantitative assessment how IL and SL can contribute to microgrid planning. The pure peak clipping model with IL and SL is also provided for comparisons. Moreover, sensitivity analysis of parameters in the model is *** results confirm that the proposed model is an effective method for reducing the planning cost of microgrids. It was also found that the major contributing factors of IL and SL have great impact on the economic benefits of the proposed model in low-carbon economy environments.

关键词： Interruptible load(IL) Shiftable load(SL) Integrated resources planning(IRP) Load control Microgrid

A Multiple-Port Three-Level DC/DC Converter for HESS with Power Sharing in DC Microgrids

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Chinese Journal of Electronics 2021年第3期30卷 570-583页

作者： JIAO Tong ZHANG Xi'nan WANG Benfei CUI Guangquan MA Wanzhong state grid Liaoning Marketing Service center Sun Yat-sen University

In order to reduce the volume, weight and cost of conventional hybrid energy storage system(HESS) while properly exploring the complementary features of different energy storage devices for DC microgrid applications, this paper proposes a multipleport three-level DC/DC converter. It possesses multiple ports sharing one front-end three-level DC/DC converter with an inductor and supercapacitor bank. Different types of batteries and/or multiple battery banks can be interfaced through the multiple terminals. Such a converter structure facilitates the cooperation of different energy storage devices to satisfy various power demands of DC microgrids with intermittent renewable generation plants. Moreover, the proposed structure allows power sharing among different energy storage devices, which enables more efficient cooperation of different battery banks or different types of batteries. Experimental results are presented to verify the efficacy of the proposed converter structure and its control.

关键词： conventional hybrid energy storage system different battery banks multiple-port supercapacitors DC microgrid applications DC-DC power convertors distributed power generation DC microgrids multiple ports different energy storage devices energy storage multiple battery banks converter structure power sharing multiple terminals

Application of thyristor controlled phase shifting transformer excitation impedance switching control to suppress short-circuit fault current level

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Journal of Modern Power Systems and Clean Energy 2018年第4期6卷 821-832页

作者： Jun LIU Xudong HAO Xu WANG Yefu CHEN Wanliang FANG Shuanbao NIU Shaanxi Key Laboratory of Smart grid State Key Laboratory of Electrical Insulation and Power Equipment School of Electrical Engineering Xi'an Jiaotong University northwest Subsection of state grid Corporation of China

Short-circuit fault current suppression is a very important issue in modern large-interconnected power networks. Conventional short-circuit current limiters, such as superconducting fault current limiters, have to increase additional equipment investments. Fast power electronics controlled flexible AC transmission system(FACTS)devices have opened a new way for suppressing the fault current levels, while maintaining their normal functionalities for steady-state and transient power system operation and control. Thyristor controlled phase shifting transformer(TCPST) is a beneficial FACTS device in modern power systems, which is capable of regulating regional powerflow. The mathematical model for TCPST under different operation modes is firstly investigated in this study. Intuitively, the phase shifting angle control can adjust the equivalent impedance of TCPST, but the effect has been demonstrated to be weak. Therefore, a novel transformer excitation impedance switching(EIS) control method, is proposed for fault current suppressing, according to the impedance characteristics of TCPST. Simulation results on IEEE 14-bus system have shown considerable current limiting characteristic of the EIS control under various fault types. Also, analysis of the timing requirement during fault interruption, overvoltage phenomenon, and ancillary mechanical support issues during EIS control is discussed,so as to implement the proposed EIS control properly for fast fault current suppression.

关键词： Excitation impedance switching(EIS) control Interruption time sequence Phase shifting angle(PSA) control Short-circuit fault current suppression Thyristorcontrolled phase shifting transformer(TCPST)

Evaluation of Multi-Temporal-Spatial Scale Adjustment Capability and Cluster Optimization Operation Method for Distribution Networks with Distributed Photovoltaics

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Energy Engineering 2024年第9期121卷 2655-2680页

作者： Jiaxin Qiao Yuchen Hao Yingqi Liao Fang Liang Jing Bian Northeast Electric Power University Key Laboratory of Modern Power System Simulation and Control&Renewable Energy TechnologyMinistry of EducationJilin132011China state grid Jiangsu Electric Power Co. Ltd.Power Dispatch Control CenterNanjing210017China state grid Jiangsu Electric Power Co. Ltd.Nanjing Power Supply BranchPower Dispatch Control CenterNanjing210019China

Themassive integration of high-proportioned distributed photovoltaics into distribution networks poses significant challenges to the flexible regulation capabilities of distribution *** accurately assess the flexible regulation capabilities of distribution stations,amulti-temporal and spatial scale regulation capability assessment technique is proposed for distribution station areas with distributed photovoltaics,considering different geographical locations,coverage areas,and response ***,the multi-temporal scale regulation characteristics and response capabilities of different regulation resources in distribution station areas are analyzed,and a resource regulation capability model is established to quantify the adjustable range of different regulation *** this basis,considering the limitations of line transmission capacity,a regulation capability assessment index for distribution stations is proposed to evaluate their regulation ***,considering different geographical locations and coverage areas,a comprehensive performance index based on electrical distance modularity and active power balance is established,and a cluster division method based on genetic algorithms is proposed to fully leverage the coordination and complementarity among nodes and improve the active power matching degree within ***,an economic optimization model with the objective of minimizing the economic cost of the distribution station is established,comprehensively considering the safety constraints of the distribution network and the regulation constraints of *** model can provide scientific guidance for the economic dispatch of the distribution station ***,case studies demonstrate that the proposed assessment and optimization methods effectively evaluate the regulation capabilities of distribution stations,facilitate the consumption of distributed photovoltaics,and enhance the economic efficiency of th

关键词： Distributed photovoltaic distribution station area assessment of adjustment capacity line transmission capacity economic optimization

Partitioning Calculation Method of Short-Circuit Current for High Proportion DG Access to Distribution Network

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Energy Engineering 2024年第9期121卷 2569-2584页

作者： Wei Wang Qingzhu Shao Shaoliang Wang Yiwei Zhao Yuanbo Ye Duanchao Li Mengyu Wu Anhui Electric Power dispatch and Control center State Grid Anhui Electric Power Co.Ltd.Hefei230000China School of Electrical Engineering Beijing Jiaotong UniversityBeijing100000China

Aiming at the problemthat the traditional short-circuit current calculationmethod is not applicable to Distributed Generation(DG)accessing the distribution network,the paper proposes a short-circuit current partitioning calculation method considering the degree of voltage drop at the grid-connected point of ***,the output characteristics of DG in the process of low voltage ride through are analyzed,and the equivalent output model of DG in the fault state is ***,by studying the network voltage distribution law after fault in distribution networks under different DG penetration rates,the degree of voltage drop at the grid-connected point of DG is used as a partition index to partition the distribution ***,iterative computation is performed within each partition,and data are transferred between partitions through split nodes to realize the fast partition calculation of short-circuit current for high proportion DG access to distribution network,which solves the problems of long iteration time and large calculation error of traditional short-circuit ***,a 62-node real distribution network model containing a high proportion of DG access is constructed onMATLAB/Simulink,and the simulation verifies the effectiveness of the short-circuit current partitioning calculation method proposed in the paper,and its calculation speed is improved by 48.35%compared with the global iteration method.

关键词： High proportion DG short-circuit calculation low voltage ride through partition iteration