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.

Robust Optimal Dispatch of Micro-energy Grid with Multi-energy Complementation of Cooling Heating Power and Natural Gas
ZOU Yunyang , YANG Li , LI Jiayong , XIAO Lei , YE Hao , LIN Zhenzhi
2019/3/26 15:46:50  DOI: 10.7500/AEPS20181028004
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With the adjustment of energy structure, micro energy grid integrated with renewable energy source (RES) input such as wind/photovoltaic (PV) and multi-energy complementation output of cooling heating power and natural gas, has been gradually developed. How to coordinate and dispatch the various kinds of energy resources above within micro energy grid becomes a research hotspot. In this paper, the coordinated dispatching models under islanded/grid-connected modes of micro energy grid with multi-energy complementation of cooling heating power and natural gas are established. Meanwhile the thermal inertia of the heating/cooling system and the flexibility of the heating and cooling are considered to develop energy storage function of the heating/cooling system. The power to gas (P2G) device is introduced to achieve the two-way flow of energy between the power and natural gas networks. Based on Kang’s robust optimization, the stochastic optimization models are transformed into the deterministic optimization models to achieve a compromise between economics and robustness. The simulation results demonstrate optimization effect of energy storage characteristics of temperature loads on flexible dispatch of micro energy grid and coordination function of robust index on optimization results.
A Fast Charging Guidance Strategy for Multiple Demands of Electric Vehicle -Fast Charging Station-Distribution Network
SHAO Yinchi , MU Yunfei , LIN Jiaying , WANG Kairang , GONG Yu
2019/3/26 11:35:46  DOI: 10.7500/AEPS20181127010
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A fast charging guiding strategy for the demand of the electric vehicles (EVs), fast charging stations (FCSs) and the distribution network is proposed. Firstly, a charging guiding architecture in multi-information interaction scenarios is introduced. Secondly, based on the result of charging demand by Origin-Destination (OD) analysis, a double queue model is proposed to simulate the dynamic queue of FCSs. According to the dynamic queue and charging load threshold under the constrain of node voltage of distribution network, a price stimulus method is adopted to guide the user to choose the FCSs with the goal of minimizing the charging cost. Finally, a case with 1000 EVs in an urban area is demonstrated to prove that users, FCSs and distribution network can benefit from the strategy in different aspects.
Design and Simulation of Renewable Portfolio Standard and Tradable Green Certification Mechanism
DONG Fugui , SHI Lei
2019/3/26 10:52:56  DOI: 10.7500/AEPS20180610004
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Recently, the issue of renewable energy consumption has become the main bottleneck of energy low-carbon transformation. To solve this problem, this paper puts forward a renewable portfolio standard system as well as its supporting green certificates trading mechanism on the power generation side that considers as far as possible to ensure the balance between supply and demand of green certificates In the green certificates trading market, which takes the renewable energy generation of the previous period as one of the basis for the quantity of green certificates obtained for the current period production of renewable energy units, and takes the level of completion of the previous fossil energy quota as one of the basis for setting the quota of fossil energy generator in the current period. According to the characteristics of the oligopoly competition in the wholesale electricity market and the green certificates trading market, a multi-oligopoly non-cooperative game model is established to simulate the mechanism, The results show that the designed mechanism has a significant effect on promoting the consumption of renewable energy.
Model Predictive Control Strategy for Combined Wind-Storage System to Participate in Frequency Response
YU Linbo , KOU Peng , FENG Yutao
2019/3/26 10:51:47  DOI: 10.7500/AEPS20180923001
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The flexible control characteristic of battery energy storage system (BESS) makes it an advantage in participating in grid frequency regulation. The combination of wind power and BESS has the effect of synergistic enhancement. Thus, based on model predictive control, a coordinated strategy of wind-BESS hybrid system for frequency response is proposed. By solving moving horizon optimization problem, this control strategy can optimally coordinate the active power support of wind farm and BESS while satisfying a set of constraints of the hybrid system. Moreover, moving horizon estimation (MHE) is used to estimate grid power variation in real time, which ensures that the optimization process is based on more accurate system information. The simulation results show that the proposed strategy can effectively improve the system frequency control performance.
Harmonic Oscillation Analysis and Control Measure of Power System Integrated with DC through Series Compensation
MEI Yong , ZHAO Xiaobing , LIU Hongtao , XIE Huifan , YANG Jian
2019/3/26 10:49:30  DOI: 10.7500/AEPS20180525010
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On May 29, 2017, a commutation failure caused by AC system short circuit fault outside the region occurred in Yongfu DC. During the commutation failure, a large number of harmonics were excited and sustained for a long time ,thus multiple groups of filter tripped and the DC power was limited. In this paper, the harmonic wave features and recovery characteristics in the event were analyzed based on the on-site record curve and the sequences. It is proposed that the harmonic oscillation of the AC system integrated with DC through series compensation lines is the direct reason to exciting a large number of harmonics. Besides, the relationship between the harmonic attenuation characteristics and the number of filter banks is analyzed qualitatively. Based on EMTDC simulation analysis, the relationship between harmonic characteristics between series compensation, DC power and parallel high re-sistance is verified. On this basis, the DC operation control scheme is proposed and the automatic bypass compensation control measures are implemented. Finally, the effectiveness of DC control measures is verified in the field test.
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](442)[PDF](255)
Abtract:
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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