ISSN 1000-1026
CN 32-1180/TP
  • ISSN 1000-1026
  • CN 32-1180/TP

ISSN 1000-1026

CN 32-1180/TP

Automation of Electric Power Systems

Competent Authorities:State Grid Corporation of China

Sponsored by:State Grid Electric Power Research Institute/NARI Group Corporation

Publisher:State Grid Electric Power Research Institute Press

Journal Tags:Ei,Scopus,INSPEC,CSA,CAS,AJ,JST,Google Scholar,CSAD-C,CSPD,CSCD,CCJAD,CAJCED

  • Period:Semimonthly Publication
  • Editor in Chief:XUE Yusheng
  • Language:Chinese
  • Release Date:Feb,1977

Description

Automation of Electric Power Systems (AEPS),started publication since 1977,has been one of the core periodicals of Ei since 1999 and has been indexed in 14 famous domestic and overseas searching databases. The authoritative data from Google scholar H5, SCImago Journal Rank, CiteScore metrics from Scopus, etc. show that AEPS is always among the best Chinese academic journals.

        Also, AEPS is one of the journals with the highest impact factor for years in the field of electric power in China.

Dynamic N-1 Risk Assessment Technology Considering Whole Process of Dispatching Operation
LIN Zizhao , HU Ziheng , XU Xi , HE Xiaofeng , Zou Zhiyong , LIU Xuefei
2019/3/22 10:24:03  DOI: 10.7500/AEPS20180726008
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In order to comprehensively assess the risks of alternative dispatching schemes, a novel risk assessment technical framework, called dynamic N-1 risk assessment, is proposed. It considers the whole process risk of the dis-patching operation, including the N-1 contingency of target grid and the related N-1 bus accident caused by switching operation. This paper proposes the probabilistic models for dynamic N-1 risk assessment, the unified risk indicators and corresponding quantitative methods. The failure probability of switching operation is described by the state-transition matrix, and the coupling degree of related indicators is reduced by logarithmic synthesis. The case study of Shenzhen power grid demonstrates the feasibility and effectiveness of the proposed method. Now, this dynamic N-1 risk assessment method has been adopted by Shenzhen Power Supply Bureau and provides the quantitative data support for power grid dispatching.
Coordinated Dispatching of Source-Grid-Load for Inter-regional Power Grid Considering Uncertainties of Both Source and Load Sides
LYU Kai , TANG Hao , WANG Ke , TANG Biqiang , WU Haiwei
2019/3/22 10:21:07  DOI: 10.7500/AEPS20180905007
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As the increasing inter-regional grid interconnection, penetration of new energy sources and dispatch capability of demand side cause more challenges to current power grid, a coordination dispatch problem for the inter-regional power grid under the uncertainties of both source and load sides is focused in this paper. Based on the hierarchical dispatch architecture, a coordination dispatch model of tie-line, load and sources for inter-regional power grid is established, in which the stochastic characteristic and dispatch mode of new energy sources in sending-end and flexible load in receiving-end are considered. Then, concerning the uncertain factors affect the constraints and the values of objective functions, the stochastic chance-constrained programming method is used to formulate the basic dispatch optimization model. At last, considering the difficulties in solving the basic model, an improved hierarchical optimization model which consists of an upper layer for the unit commitment and tie-line schedule, and a lower layer for the economic dispatch is established. Two improved PSO algorithms are introduced to solve the two-layer optimization model. In results part, the dispatch plan under the uncertain environment is analyzed to validate the hierarchical optimization model and the solving method.
Flexible Coordination Assessment of Distribution Network Considering Uncertainty and Initiative
XIN Hao , CAI Jiaming , WANG Chengmin , XIE Ning , YANG Haibo
2019/3/22 10:19:48  DOI: 10.7500/AEPS20180528004
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In view of the increasing number of passive uncertainties and study of initiatives in distribution networks, this paper improves the flexibility evaluation model of active power, and proposes a discrete implicit enumeration method (DIEM) to solve the “max-min-max” problem of flexible models. Through the assessment and matching of the active power flexibility index, the model evaluates the flexibility level of each node for analyzing the power supply capacity of the distribution network. Combined with the analysis of examples, it is shown that active power flexibility assessment and matching can effectively exploit the weakness of the network. Improving flexibility should be one of the goals of distribution network scheduling optimization and planning construction.#$NLKeywords: Uncertainty; initiative; flexible assessment; distribution network; weakness
Optimal Configuration of Generalized Spinning Reverse for Power Grid Based on Characteristics of System Frequency Response
TAO Renfeng , LI Fengting
2019/3/22 10:18:31  DOI: 10.7500/AEPS20180407003
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The existing configuration methods of spinning reserve (SR) only consider conventional units as the source of SR, and the advantage of new power facilities such as energy storage devices and flexible loads are not taken into account. This paper proposes the concept of generalized spinning reserve of power grid. And the fluctuation and prediction error models of equivalent load of power grid (difference between original load of power grid and renewable energy generation output at corresponding time) are established based on serialization modeling method and Copula function describing the dependence structure among variables. Considering characteristics of system frequency response (SFR), taken the minimum total cost of generalized spinning reserve of power grid, power outage cost and power curtailment cost of renewable energy generation as objective functions, a new optimization strategy of generalized spinning reserve for power grid with high penetration of renewable energy is proposed. Finally, according to the actual data of a regional grid with high penetration of renewable energy in Xinjiang Uygur Autonomous Region, China, the feasibility of the proposed strategy is verified through simulation.
Protection of Line Breakage Fault Based on Ratio of Sum and Difference of Single-ended Transient Current for Flexible DC Distribution Systems
JIA Ke , FENG Tao , ZHAO Qijuan , WANG Congbo , ZHU Rui , BI Tianshu
2019/3/21 15:50:11  DOI: 10.7500/AEPS20180318004
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The characteristics of line breakage fault in DC distribution system are not distinctive compared with normal operation. The existing line breakage protections which rely on the single-terminal electrical quantity is difficult to identify the faulty line accurately and reliably. This paper proposes a novel protection method for line breakage fault based on ratios of sum and difference of single-ended positive and negative currents. By analyzing the characteristics of line breakage fault in open-loop and closed-loop operation modes of a four-terminal DC distribution system, the differences of line currents between fault pole and non-fault pole can be obtained when line breakage fault occurs. The differences between fault pole and non-fault pole are amplified by the ratios of sum and difference of the line currents to identify the fault pole reliably. The proposed protection principle is simple, straightforward and can avoid the setting calculation problem. In addition, fault identification and pole selection can be achieved quickly based on local measurement information. Finally, the performance of the proposed method is verified by simulation results.
Views
Review on Case Filtering in Transient Stability Analysis
XUE Yusheng , HUANG Tiangang , CHEN Guoping , ZHENG Yuping , WEN Fushuan , XU Yan , ZHAO Junhua
2019, 43(6): 1-14.DOI: 10.7500/AEPS20181008004
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In the case filtering link, as many stable and unstable cases as possible can be identified rapidly through qualitative machine learning or quantitative approximate analysis so that the number of cases requiring detailed analysis and the total computational burden can be reduced. This paper discusses the adopted assumptions, characteristic variables, classification rules and generalization ability of case filtering in transient stability analysis. The integration of data driven and model driven is analyzed, which includes the introduction of causal elements, the deep integration of data statistic paradigm and model simulation paradigm for knowledge extraction. Based on the stability mechanism, a two-layer classifier is proposed: the lower layer contains several parallel links, and each link utilizes quantitative algorithm with different degrees of approximation. Their output data are regarded as the input of the upper layer. According to the approximate causality, it can reflect the influence of most original data on transient stability. Therefore not only the correct recognition rate and robustness of the classifier can be both enhanced, but also the error mechanism, evaluation credibility and acceptability can be revealed.
Cyber Energy Systems
Quantitative Survivability Assessment of Power Cyber-Physical System Considering Optimized Load Redistribution
QU Zhaoyang , DONG Yunchang , QU Nan , LIU Yaowei , YIN Xiang'ai , LI Guisen
2019, 43(6): 15-24.DOI: 10.7500/AEPS20180720006
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Because the scale of power cyber-physical system(CPS)is growing, and the existing cascade failure model ignores the information flow and the power flow transfer characteristics, it is difficult to quickly and effectively assess the survivability. Aiming at this problem, this paper proposes a quantitative survivability assessment method of power CPS considering load optimized redistribution. Firstly, according to the system topology and association, the degree-media weighted correlation matrix of power CPS is established by defining the degree function and the electrical interface, and the formal representation of coupled CPS is realized. Then, based on the structural connectivity change and risk propagation range of CPS cascade failure, the survivability assessment model is designed based on the constraints such as node load capacity limitation, optimal allocation strategy of information flow, power flow optimization equation and system safety operation. Finally, the chaotic Lévy search firefly algorithm is proposed to efficiently solve the assessment model. The case study shows that the assessment method can effectively quantify the survivability of power CPS and improve the assessment efficiency of large-scale coupled systems.
Second-order Cone Programming Based Probabilistic Optimal Energy Flow of Day-ahead Dispatch for Integrated Energy System
ZHANG Bowen , SUN Yonghui , ZHANG Shida
2019, 43(6): 25-33.DOI: 10.7500/AEPS20180510004
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With the aggravation of energy crisis, re-electrification has become an inevitable choice to solve the problem of energy development. Taking gas-electric integrated energy system(IES)as a new way of re-electrification, second-order cone programming(SOCP)is proposed to solve the probabilistic optimal energy flow of the day-ahead dispatch of IES. Firstly, the day-ahead dispatch of IES model consists of the electric power system(EPS), the natural gas system(NGS)and the energy hub(EH). Then, the day-ahead dispatch of IES model is changed into a convex model and the point estimation method is used to solve the probabilistic optimal energy flow of the day-ahead dispatch. Finally, a typical case study indicates that the algorithm is correct and effective on the YALMIP platform in MATLAB.
Basic Research
Analysis on Pattern of Power System Cascading Failure Based on Sequential Pattern Mining
LIU Yuhang , HUANG Shaowei , MEI Shengwei , ZHANG Xuemin
2019, 43(6): 34-40.DOI: 10.7500/AEPS20180528009
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Studying the propagation mechanism of cascading failures is of great significance for identifying the vulnerable lines in power grid and formulating prevention and blocking strategies for cascading failures. Based on analyzing the development progress of cascading failures, the concept of cascading failure pattern is defined. A cascading failure pattern mining algorithm(CFPMA)based on sequential pattern mining technology is proposed to analyze massive simulation data and identify critical cascading failure pattern of power system. Finally, taking the IEEE 39-bus system and a real provincial power system for example, CFPMA is used to mine the main cascading failure patterns, and the cascading failure propagation law is analyzed by combining the power grid topology and power flow. The test results show that the proposed method has a good effect on identifying the main cascading failure patterns and the vulnerable lines.
Impedance Modeling and Sub-synchronous Resonance Mitigation Strategy of Doubly-fed Induction Generator Based Wind Turbine in Static Reference Frame
ZHANG Xueguang , QIU Wangming , FANG Ran , ZHU Lin , XU Dianguo
2019, 43(6): 41-48.DOI: 10.7500/AEPS20180824002
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To explain the mechanism of sub-synchronous resonance(SSR)in doubly-fed induction generator(DFIG)based wind turbine system under series compensation, a static reference frame impedance model of DFIG based wind turbine is established. Firstly, the dq impedance model of DFIG based wind turbine is transformed into complex vector form and its frequency-domain impedance model is derived by frequency transformation. Based on the physical interpretation represented by the impedance model, the influence of controller and network parameters on equivalent impedance and SSR frequency of grid-connected system is analyzed using equivalent RLC series circuit. Damping control and virtual inductance control are proposed to mitigate SSR, which can increase the damping of SSR region and reduce the SSR frequency of the system, respectively. Finally, the accuracy of the model and theoretical analysis is verified by simulation.

Editors Recommend

Analysis on Virtual Torque and Oscillation Instability Mechanism of Virtual Synchronous Generator with Reactive Power-Voltage Controller
LIU Ni , ZHANG Changhua , LIAO LI , CHEN Xin , CHEN Shuheng , LIU Qunying
2019, 43(6): 107-115.DOI: 10.7500/AEPS20180608005
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Virtual synchronous generator(VSG)has become an attractive scheme for connecting inverters with grids by simulating electromechanical transient process of synchronous generators. However, there also exists power oscillation problems in the VSG, and the related research on oscillation mechanism is needed. Based on the theory of torque analysis in the traditional power system, this paper establishes a small-signal model of VSG with reactive power-voltage controller. Combined with the oscillation mode, the virtual torque coefficient is redefined. Then the relationship between the virtual torque coefficient and VSG stability is analyzed. It is mathematically proved that the lack of virtual damping torque will lead to power oscillation instability of VSG. Taking the VSG with robust droop control as an example, the calculation method of virtual torque coefficient is given, and the conclusion is verified through PSCAD/EMTDC simulation and physical experiment. Finally, this paper discusses the effect of VSG with reactive power-voltage controller on the virtual torque coefficient and system small-signal stability from different perspectives, such as the initial state of the system, line parameters and controller parameters. The research is beneficial to the VSG controller design and the system small-signal stability analysis.
Power Market Transaction Analysis of Index of Beijing Electric Power Exchange Center Under New Electricity Reform
SHI Lianjun , PANG Bo , LIU Dunnan , QIN Guangyu , LI Guodong , ZHANG Qian
2019, 43(6): 163-170.DOI: 10.7500/AEPS20180720012
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It is an important problem to effectively process and analyze power data with the increasingly active power trading markets across the country and the increasingly abundant types and quantities of power trading. Firstly, this paper analyzes all kinds of index preparation methods and their application in domestic and foreign markets, and presents the index of Beijing Electric Power Exchange Center(referred to as electric power index)which reflects the change of the electric power market transaction structure and quantity of electricity market participants to provide the reference and guidance to the market. Then, by referring to the guidance and instruction effect of Dow Jones theory and other market composite index theories in the securities market, the calculation and analysis method of the power market composite index is presented. It also explains how to analyze the characteristics of total electricity trading volume, seasonal fluctuation, regional difference and transaction type difference with the electric power index. The five factors influencing the electric power market composite index are investigated, including the total electricity consumption, market liberalization ratio, market trading price, trading varieties and market access area. Finally, the calculation formula of the electric power index is used to analyze the power market data from 2016 to 2017, and the results prove that the electric power index can accurately reflect the trade in the power exchange market.
Review on Case Filtering in Transient Stability Analysis
XUE Yusheng , HUANG Tiangang , CHEN Guoping , ZHENG Yuping , WEN Fushuan , XU Yan , ZHAO Junhua
2019, 43(6): 1-14.DOI: 10.7500/AEPS20181008004
[Abtract](386)[PDF](231)
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In the case filtering link, as many stable and unstable cases as possible can be identified rapidly through qualitative machine learning or quantitative approximate analysis so that the number of cases requiring detailed analysis and the total computational burden can be reduced. This paper discusses the adopted assumptions, characteristic variables, classification rules and generalization ability of case filtering in transient stability analysis. The integration of data driven and model driven is analyzed, which includes the introduction of causal elements, the deep integration of data statistic paradigm and model simulation paradigm for knowledge extraction. Based on the stability mechanism, a two-layer classifier is proposed: the lower layer contains several parallel links, and each link utilizes quantitative algorithm with different degrees of approximation. Their output data are regarded as the input of the upper layer. According to the approximate causality, it can reflect the influence of most original data on transient stability. Therefore not only the correct recognition rate and robustness of the classifier can be both enhanced, but also the error mechanism, evaluation credibility and acceptability can be revealed.
Analysis and Recommendations of Typical Market-based Distributed Generation Trading Mechanisms
LIN Li , XU Bingqian , WANG Haohuai
2019, 43(4): 1-8.DOI: 10.7500/AEPS20180829001
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In November 2017, China issued Notice on the Pilot Market-based Trading of Distributed Generation(hereinafter referred to as ‘Notice'), which opened the curtain of market-based distributed generation trading. Considering distributed generation trading is still in the pilot stage in China, some problems such as the trading mode and trading mechanism need further exploration. Firstly, the basic concepts and characteristics of distributed generation trading are expounded, and three main foreign distributed generation trading mechanisms and their application and development status are summarized. This paper makes a comparative analysis of the pilot trading model given by the Notice, and then focuses on the analysis of three representative peer-to-peer(P2P)energy trading platforms located in the United Kingdom, Germany and the United States. Finally, the future development of distributed generation trading in China is discussed, hoping to provide some reference for the development of China's power trading.
Design of Peak Regulation Auxiliary Service Market for East China Power Grid to Promote Inter-provincial Sharing of Negative Reserve
HU Zhaoyang , BI Xiaoliang , WANG Ke , HU Hong , LIU Yongjun , GUO Xiaorui
2019, 43(5): 175-182.DOI: 10.7500/AEPS20180711007
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Due to the constant increase of incoming clean electricity from the outside region, the rapid development of new energy inside East China region, the slow growth of valley load, and the year-by-year increase of peak and valley differences in electricity consumption, the peak regulation difficulty during the valley period has been becoming an intractable problem and the market mechanism for sharing the peak regulation resources among different provinces is urgently needed to promote the construction of peak regulation resources. In this paper, the market positioning, basic principles and market operation rules of joint peak regulation auxiliary service market design for East China power grid are mainly introduced. Some key issues are discussed such as the reasons for giving priority to the use of peak sharing resources in the province, unified marginal price clearing mechanism, the allocation mode of “who cause, who share”, profits of all participants, and the interactive ways to other provincial markets. Based on the typical-day example of peak-regulation difficulty, the organization process, the settlement method and sharing principle of peak regulation auxiliary service market of East China power grid are analyzed. Based on the simulation of real market operation, the operation efficiency and the correlation between the clearing price and quantity are analyzed. Through the simulation of a real power system and practical operation, it is shown that the proposed inter-provincial sharing mechanism is effective and can help to promote the optimal allocation of peak regulation resources among provinces.

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