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Analytical Calculation Method of Reliability Sensitivity Indexes for Distribution Systems Based on Fault Incidence Matrix

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Journal of Modern Power Systems and Clean Energy 2020年第2期8卷 325-333页

作者： Tianyu Zhang Chengshan Wang Fengzhang Luo Peng Li Liangzhong Yao the Key Laboratory of Smart grid of Ministry of Education Tianjin UniversityTianjin 300072China state grid tianjin Electric Power Company economic and Technological research institute Tianjin 300171China China Electric Power research institute Beijing 100192China

An analytical calculation method for the reliability sensitivity indexes of distribution systems is proposed to explicitly quantify the impact of various influence factors on system ***,the analytical calculation formulas for the reliability indexes of distribution systems are derived based on the fault incidence matrix(FIM).Secondly,the factors that affect system reliability are divided into two categories:quantifiable parameter factors and non-quantifiable network structure *** sensitivity indexes for the quantifiable parameter factors are derived using the direct partial derivation of the reliability calculation *** sensitivity indexes for the nonquantifiable network structure factors are derived using the transformation of ***,the accuracy and efficiency of the proposed sensitivity calculation method are verified by applying them to an IEEE 6-bus RBTS *** paper sums up the factors that influence system reliability in detail and gives the explicit analytical calculation method for the sensitivity of each *** calculation of the reliability index can be avoided during the sensitivity *** bottleneck that affects the reliability level of distribution systems can be identified efficiently,and valuable information and guidance can be provided to enhance the reliability of distribution systems.

关键词： Distribution system reliability fault incidence matrix reliability sensitivity analytical calculation

Effect Evaluation and Intelligent Prediction of Power Substation Project Considering New Energy

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Computer Modeling in Engineering & Sciences 2022年第9期132卷 739-761页

作者： Huiying Wu Meihua Zou Ye Ke Wenqi Ou Yonghong Li Minquan Ye state grid Fujian economic research institute Fuzhou350000China

The evaluation of the implementation effect of the power substation project can find out the problems of the project more comprehensively,which has important practical significance for the further development of the power substation *** ensure accuracy and real-time evaluation,this paper proposes a novel hybrid intelligent evaluation and prediction model based on improved TOPSIS and Long Short-Term Memory(LSTM)optimized by a Sperm Whale Algorithm(SWA).Firstly,under the background of considering the development of new energy,the influencing factors of power substation project implementation effect are analyzed from three aspects of technology,economy and ***,an evaluation model based on improved TOPSIS is ***,an intelligent prediction model based on SWA optimized LSTM is ***,the scientificity and accuracy of the proposed model are verified by empirical analysis,and the important factors affecting the implementation effect of power substation projects are pointed out.

关键词： New energy substation implementation effect evaluation and intelligent prediction improved topsis LSTM SWA

Mitigation of power system forced oscillations based on unified power flow controller

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Journal of Modern Power Systems and Clean Energy 2019年第1期7卷 99-112页

作者： Ping JIANG Zikai FAN Shuang FENG Xi WU Hui CAI Zhenjian XIE School of Electrical Engineering Southeast University state grid Jiangsu economic research institute

Forced oscillations(FOs), or low-frequency oscillations(LFOs) caused by periodic, continuous, small power disturbances, threaten the security and stability of power *** AC transmission system(FACTS)devices can effectively mitigate LFOs via stability *** propose a novel method that mitigates FOs by shifting the resonant *** on the features of the linearized swing equation of a generator, a resonant frequency shift can be achieved by controlling the synchronous torque coefficient using a unified power flow controller(UPFC).Because of the resonance mechanism, the steady-state response of an FO can be effectively mitigated when the resonant frequency changes from the original one, which was close to the disturbance *** principle is that a change in resonant frequency affects the resonance *** are conducted in a single-machine infinite-bus(SMIB) system, and the simulation results verify that the method is straightforward to implement and can significantly mitigate *** controller robustness when the resonant frequency is not accurately estimated is also analyzed in the simulations.

关键词： Forced oscillations Flexible AC transmission systems Unified power flow controller Stability control

HPDS133-bus:A Benchmark Test System for Distribution Systems with High Penetration of Distributed Generation

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CSEE Journal of Power and Energy Systems 2023年第3期9卷 963-977页

作者： Fengzhang Luo Chongbo Sun Xin Yang Tianyu Zhang Chengshan Wang Jun Xiao Liangzhong Yao Lingzhi Zhu Minhui Qian Key Laboratory of Smart grid of Ministry of Education Tianjin UniversityTianjin 300072China state grid economic and Technology research institute Co. Ltd.Changping DistrictBeijing 102209China Ultra High Voltage Company State Grid Henan Electric Power CompanyZhengzhou 450007China economic and Technology research institute State Grid Tianjin Electric Power CompanyTianjin 300171China School of Electrical Engineering and Automation Wuhan UniversityWuhan 430072China China Electric Power research institute Xiaoying RoadBeijing 100192China

The benchmark test system for distribution systems is necessary and important for system analysis and result data *** order to meet the development demand of the distribution systems which integrate with a high penetration of distributed generation(DG),a benchmark test system for the distribution systems which adapts to current and future development trends is *** on the concentric zone theory and the typical regional settlement model in China,three typical distribution system scenarios corresponding to different system circle structures and regional development characteristics are designed in this *** order to adapt to the trend that the distribution systems will present the mixed state of AC and DC,a typical improvement scheme of distribution systems in urban scenario is *** benchmark test system of low-voltage distribution systems in a rural scenario is also designed because of the high penetration of ***,the system structure,load parameters,integrated capacity and output characteristics of varies types of DG in different scenarios are described in ***,the simulation results,such as the time series power flow,reliability evaluation and hosting capacity of DGs are *** benchmark test system proposed in this paper will lay a foundation for future research on distribution systems with a high proportion of DG and effectively support the distribution systems planning,design,operations and dispatches.

关键词： Benchmark test system distribution systems DG PV typical scenario

Security Region: An Intelligent Approach to Transportation Networks

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CSEE Journal of Power and Energy Systems 2023年第4期9卷 1532-1539页

作者： Jun Xiao Menghao Long Guoqiang Zu Qisi Lin Key Laboratory of Smart grid of Ministry of Education Tianjin UniversityTianjin 300072China state grid tianjin Chengdong Electric Power Supply Company Tianjin 300250Chin state grid tianjin Electric Power research institute Tianjin 300384China.

This paper proposes a security region of transporta-tion networks,which is defined as the set of flow states(operating points)satisfying the N-1 security in transportation *** boundary of the set is closed,inside all the operating points are N-1 secure;oppositely,outside all the operating points are ***,N-1 security of the transportation networks is defined,which means that when a road is blocked,vehicles on other roads within the networks can also reach their destination through different paths without being trapped on the ***,the security region of transportation networks is *** algorithm of a boundary calculation is studied and the boundary equations of security distances are ***,the proposed security of the transportation networks is presented in different *** paper demonstrates the following:1)the security region can be accurately predicted by the simulation of N-1;2)the boundary distance can show the necessary degree of security;3)security can be improved by a preventive control *** simulation on TransCAD is used to verify the correctness of the *** Terms-Boundary distance,evolution,security region,transportation network,TransCAD.

关键词： Boundary distance evolution security region transportation network TransCAD.

System Adaptive AC Filter for a Line Commutated Converter High Voltage DC Transmission System

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CSEE Journal of Power and Energy Systems 2020年第4期6卷 901-910页

作者： Xinyang Liu Weimin Ma Hongjie Jia Chaoyu Dong School of Electrical and Information Engineering of tianjin University Tianjin 300072China state grid economic and Technological research institute Co. LtdBeijing 102209China

This paper proposes a novel AC filter system for a line commutated converter high voltage DC(LCC-HVDC)transmission *** the coordination of the hybrid active power filters(APF)and the existing reactive compensation devices,the proposed filter system can not only enhance the suppression performance for LCC-HVDC harmonics,but also optimize the AC yard layout with reduced reactive power subbanks,reducing the cost of HVDC *** novel filter system adopts a serial passive resonance topology obtained by careful comparison of different APFs.A proper control scheme is then designed integrating the control strategy of the APF and impedance characteristics of the HVDC system,which is able to realize harmonic suppression and dynamic reactive power support *** addition,a novel self-adaption digital low-pass filter algorithm is presented,which is used in the APF harmonic detecting step,enhancing both high precision and fast dynamic *** the basis of a real HVDC project,the advantages of proposed filter system in harmonic suppression,reactive power regulation,and sub-banks reduction are simulated and demonstrated.

关键词： Active power filter(APF) control system harmonic detecting impedance characteristic line commutated converter high voltage DC(LCC-HVDC) reactive compensation

Multi-stage expansion planning of energy storage integrated soft open points considering tie-line reconstruction

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Protection and Control of Modern Power Systems 2022年第1期7卷 670-684页

作者： Peng Li Jie Ji Sirui Chen Haoran Ji Jing Xu Guanyu Song Jinli Zhao Jianzhong Wu Chengshan Wang Key Laboratory of Smart grid of Ministry of Education Tianjin UniversityTianjin 300072China state grid Kunshan Power Supply Company Kunshan 215300China state grid tianjin economic and Technological research institute Tianjin 300171China institute of Energy School of EngineeringCardiff UniversityCardiff CF243AAUK.

With the rapid development of flexible interconnection technology in active distribution networks(ADNs),many power electronic devices have been employed to improve system operational *** a novel fully-con-trolled power electronic device,energy storage integrated soft open point(ESOP)is gradually replacing traditional *** can significantly enhance the controllability of *** facilitate the utilization of ESOP,device loca-tions and capacities should be configured ***,this paper proposes a multi-stage expansion planning method of ESOP with the consideration of tie-line ***,based on multi-terminal modular design characteristics,the ESOP planning model is established.A multi-stage planning framework of ESOP is then presented,in which the evolutionary relationship among different planning schemes is *** on this framework,a multi-stage planning method of ESOP with consideration of tie-line reconstruction is subsequently ***,case studies are conducted on a modified practical distribution network,and the cost-benefit analysis of device and multiple impact factors are given to prove the effectiveness of the proposed method.

关键词： Active distribution network(ADN) Energy storage integrated soft open points(ESOP) Multi-stage expansion planning Tie-line reconstruction

Impact Increment Based Hybrid Reliability Assessment Method for Transmission Systems

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CSEE Journal of Power and Energy Systems 2022年第1期8卷 317-328页

作者： Yunkai Lei Yeguang Sun Kai Hou Pei Zhang Lewei Zhu Xiaoxi Yang Xiaonan Liu state grid Sichuan economic research institute Chengdu610000 China School of Electrical and Information Engineering Tianjin UniversityTianjin 300072China state grid Customer Service Center Tianjin 300072China School of Electrical and Automation Engineering East China Jiaotong UnviersityNanchang 330052China Maritime College Tianjin University of TechnologyTianjin 300384China College of economics and Management Southwest Petroleum UniversityChengdu 610000China state grid tianjin Electric Power research institute Tianjin 300072China

This paper proposes an impact-increment-based hybrid(IIHybrid)reliability assessment approach for power transmission *** proposed approach integrates the advantages of the impact-increment-based state enumeration method(IISE)and impact-increment-based Monte Carlo simulation(IIMC)to improve computational efficiency and *** IISE can efficiently assess the impacts of low-order *** accuracy is,however,sacrificed as highorder contingencies are usually *** IIMC is more suitable for large-scale contingency spaces compared with IISE,although the calculation process is *** this paper,the proposed IIHybrid takes advantage of its strengths while avoiding its *** IISE and the IIMC are applied to lower and higher contingency spaces *** high-order contingencies elimination technique proposed in our previous studies is still applicable to the *** addition,efficiency can be controlled by modifying the preset parameters to adapt to various *** studies are performed on the IEEE 118-bus test system and PEGASE *** results show that the proposed approach is more efficient and practicable than traditional methods.

关键词： Hybrid method impact-increment reliability assessment transmission system

Flexible resource allocation optimization model considering global K-means load clustering and renewable-energy consumption

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Clean Energy 2024年第5期8卷 129-143页

作者： Jie Jiao Puyu He Yuhong Zhang Jiyuan Zhang Zhuhan Long Hanjing Liu state grid Sichuan Electric Power Company economic research institute ChengduChina

Vigorously developing flexible resources in power systems will be the key to building a new power system and realizing energy *** investment construction cost and operation cost of various flexible resources are different,and the adjustment ability is different in different ***,the optimization of complementary allocation of various resources needs to take into account the economy and adjustment ability of different *** this paper,the global K-means load clustering model is pro-posed and the 365-day net load is reduced to eight typical daily net loads by ***,a two-level optimization model of flexible resource complementary allocation considering wind power and photovoltaic consumption is *** flexible resources involved include the flexible transformation of thermal power,hydropower,pumped storage,energy storage,and demand *** upper-layer model optimizes the capacity allocation of various flexible resources with the minimum investment and construction cost as the goal and the lower layer optimizes the operating output of various units with the minimum operating cost as the *** results of the example analysis show that the flexible capacity of thermal power units has nothing to do with the abandonment rate of renewable *** the abandonment rate of renewable energy decreases,the optimal capacity of pumped storage,electrochemical energy storage,and hydropower units *** the power-abandonment rate of renewable energy is 5%,the optimal allocation capacity of thermal power flexibility transformation,pumped storage,electrochemical energy storage,hydropower unit,and adjustable load in Province A is 5313,17090,5830,72113,and 4250 MW,*** the condition that the renewable-energy abandonment rate is 0,5%,and 10%respectively,the configured capacity of pumped storage is 20000,17090,and 14847 MW,respectively.

关键词： wind power photovoltaic power K-means clustering algorithm flexible resources complementary configuration operation optimization