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.

A defect identification method of transmission conductors based on radial basis probabilistic neural network
HUANG Xin Bo
2019/12/13 18:46:45  DOI: 10.7500/AEPS20190122004
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A timely identification of the defects in the transmission line is of great significance for the maintenance, by which the severe power accidents can be avoided or decreased. For the background of images captured by unmanned aerial vehicle(UAV) is very complex and difficult to be detected, a radial-based probabilistic neural network based fault location identification method for transmission lines is proposed. The weighted color difference method, maximum between-class variance method (Ostu) and morphological filtering are sequentially adopted to realize the accurate segmentation of transmission conductors for the images with complicated background. Then, the segmented conductor area is equally divided into 10 conductor sub-images, 40 texture enhancement sub-images at 8 angles and 5 dimensions of transmission lines are obtained by Gabor filter, and the roughness, contrast and orientation of each sub-image are also extracted. By the variance of the feature, 10 strong texture features are selected and adopted as the input parameters to the radial basis probabilistic neural network for the defect identification of transmission conductors. The results show that both the rapid segmentation of transmission conductors and the accurate identification of the defects based on the images with complex background can be achieved by the proposed method, whose accuracy rate is 93.33%. It proves the defect identification method of transmission conductors based on radial basis probabilistic neural network is reliable and applicable.
Structure and Operation Analysis of 100 MW Class Battery Energy Storage Station on Grid-side in Jiangsu Power Grid
LI Jianlin , NIU Meng , WANG Shangxing , ZHOU Jinghua , YUAN Xiaodong
2019/12/6 8:53:01  DOI: 10.7500/AEPS20190711001
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The battery energy storage system has the obvious advantages of short construction period, fast response speed, various application modes and the like. in recent years, it has been continuously expanded in scale and has been more and more widely used with the encouragement of national and local governments. Since its commissioning in July, 2018, Zhenjiang 100 MW class energy storage power station has participated in many auxiliary service functions such as peak shaving, frequency modulation, emergency response and so on. Based on the structure characteristics of Jiangsu 100 MW class battery energy storage power station, this paper studies and analyses the operation control strategies under different application modes of the energy storage power station, and tests and analyses the response index and current operation situation of the power station, which explored the application value of large-scale energy storage power plants on the grid side.
Design Method of Energy-gaining Power Supply for Current Transformer Based on Self-adaptive Power Output Control
ZHANG Peng , WANG Wei , XU Bingyin , JIA Mingna , LIANG Dong , ZHANG Shengpeng
2019/12/4 17:56:12  DOI: 10.7500/AEPS20190624006
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The energy-gaining power supply of current transformer has the heating problem when the bus current is high, which affects the service life of the power supply. For this reason, this paper proposes a design method of the energy-gaining power supply for the current transformer based on the self-adaptive power output control. Based on the analysis of the power acquiring principle of current transformer, the load equivalent model energy-gaining coil of the current transformer is established, and the relationship between the output power of the coil and the bus current is derived. By controlling the on-off state of the bidirectional thyristor, the purpose of controlling the power output of the energy-gaining coil is achieved, and it is ensured that the power supply does not heat up at a large current. An implementation form of the adaptive power output control circuit is given. By establishing its equivalent model, the relationship between the conduction angle and the bus current is derived. Finally, the experiment show that the power prototype made according to the proposed design method can work in a low heat consumption state in a wide current range, which verifies the feasibility of the method.
Architecture and Technology Implementation of Massive Data Based Distribution Network Operation Analysis System
ZHANG Wen , SHENG Wanxing , DU Songhua , JIA Dongli , KANG Tianyuan
2019/12/4 14:49:36  DOI: 10.7500/AEPS20190520009
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Flexible analysis and application of multi-source heterogeneous data in distribution network is of great significance for accurate fault prediction and potential risk scanning, and for efficient and accurate operation analysis and decision-making of distribution network. In this paper, the overall structure and function design of a distribution network operation analysis system based on mass data are introduced, and the functions and analysis results of each module are demonstrated by an application example. The system integrates data such as geographic information system (GIS), marketing business application and distribution automation. By using improved machine learning algorithm and weak point identification method, the functions of data correlation analysis, fault risk level prediction and weak point identification of target distribution network are extended. It is helpful for relevant departments to put forward technology and management methods to carry out operation and maintenance of distribution network, improve scientificity and practicability of the existing distribution network analysis system, and ultimately lay the foundation for informationization, intellectualization and leanness of distribution network operation analysis.
Life-cycle Economic Evaluation of Renewable Energy Access Considering Line Electro-thermal Coupling
ZHANG Ruiqi , DONG Xiaoming , WANG Mengxia , YANG Ming , WANG Yong
2019/12/2 11:19:14  DOI: 10.7500/AEPS20190619007
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Taken the grid connected to remote large-scale wind farms as the research background, allowing for the synchronization effect of environmental factors on the current-carrying law of the transmission line and its mechanical performance degradation, the maximum allowable temperature assessment model for transmission lines is proposed with electro-thermal coordination theory and line aging failure model combined. Based on the electro-thermal coupling and full life cycle cost, it provides an evaluation basis for the renewable energy consumption capacity and operational performance of the grid. The model continuously processes the environmental variable values and simulates the changes of electrical and physical state parameters of the line based on the thermal inertia equation of the overhead conductor in the whole year. Then, the life cycle performance of line is predicted based on the statistical duration of each temperature interval according to the aging failure model of transmission line. The life cycle cost of overhead line can be obtained by the failure rate model, afterwards the annual average profit is expressed as a function of the maximum allowable temperature of transmission line under the premise that the unit wind power access income is fixed, thereby achieving the goal of maximizing the annual average profit. Finally, effectiveness of the proposed model is verified by the actual case study and its effect on improving the economic and safety of the system.
Special Report
Reflections on Frequency Stability Control Technology Based on the Blackout Event of 9 August 2019 in UK
FANG Yongjie
2019, 43(24): 1-5.DOI: 10.7500/AEPS20191011006
[Abtract](179)[PDF](47)
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On 9 August 2019, a blackout event with significant impacts occurred in the UK electric power system. According to the technical report submitted by the electricity system operator, UK, several separate and simultaneous events led to a large amount of sudden power deficiency that exceeds the requirements of the security and quality of supply standard(SQSS)in terms of the infeed loss that was required to be secured for. This caused a rapid fall in system frequency which eventually triggered the correct operation of the low frequency demand disconnection scheme, resulting in the supply disruption to a significant number of customers. This paper presents a description of the event evolution, conclusions and recommendations, based on the technical report. Several recommendations related to frequency stability control technology are then proposed, i. e. improvement of the accuracy and rapidness of load tripping as a control action, research on the control logics to block chain reactions, and enhancement of the system-level experimental verification for the dynamic behaviors of new power generation equipment.
Energy Transformation and Power Support
Challenges and Prospects of Generalized Wind-Hydrogen-Coal Energy System
PENG Shengjiang , YANG Shuxia , YUAN Tiejiang , HU Kelin
2019, 43(24): 6-12.DOI: 10.7500/AEPS20181231003
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Facing the energy transformation goals in wind-rich or coal-rich areas, the research results and existing problems of wind-hydrogen-coal energy system(WHCES)are summarized. Based on this, the basic concept and overall framework of generalized wind-hydrogen-coal energy system(G-WHCES)are proposed. The difference between G-WHCES and WHCES is compared on primary energy side, secondary energy side and load side. Facing the energy transformation strategy in wind-rich or coal-rich areas, the needs and applications of G-WHCES are summarized. In the case of high renewable energy penetration and insufficient regulating resource, the main challenges in the development of G-WHCES are proposed. The results indicate that more focus should be concentrated on the operation efficiency and system stability and the prospects of scientific and technological issues for G-WHCES are given on the system structure design, planning and control, key sub-system design and system integration.
Analysis and Conception of Power Generation Mode and Operation Control of Large-scale Compressed Air Energy Storage System
WANG Dan , ZHANG Tiantian , WU Jiahe , LI Cheng , TIAN Jie , MAO Chengxiong
2019, 43(24): 13-22.DOI: 10.7500/AEPS20181206004
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Compressed air energy storage(CAES)is a clean and environmentally friendly physical energy storage technology with many charging and discharging cycles, long service life, and large-scale storage of electrical energy, which is suitable for large-scale application in power systems. The characteristics of the conventional fixed-speed power generation of large-scale CAES system are analyzed. The control strategy based on full-control device excitation system is proposed for the fixed-speed constant-frequency synchronous energy storage unit, which provides stronger excitation and suppression system oscillation ability to improve the auxiliary service capacity of the energy storage unit. Furthermore, to improve the comprehensive energy efficiency, the variable-speed power generation scheme is designed conceptually based on variable-speed constant-frequency doubly-fed generator, variable-speed variable-frequency direct drive generator, and their typical operation control strategies are analyzed. The variable-speed power generation scheme has the potential to improve the control function and auxiliary service capacity of energy storage units. Finally, the challenges faced by the operation and control of power generation for large-scale CAES are analyzed.
Basic Research
Day-ahead Electricity Purchasing Strategy of Charging Station Based on Decentralized Trading Mode
ZHAN Xiangpeng , YANG Jun , WU Fuzhang , HAN Sining , XU Jian , HU Wenping
2019, 43(24): 23-31.DOI: 10.7500/AEPS20190510002
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It is very important to coordinate charging power of charging station(CS)for safe and economic operation of distribution network with large-scale construction of CSs. Restricted by the conflict of interests between different CSs and the bottleneck of real-time control technology, it is difficult for power grid companies to centralize the management of CSs. In this paper, a strategy for CSs to participate in the electricity market is proposed based on the decentralized trading mode. Firstly, according to the storage technology of blockchain, an intelligent contract is designed for pre-purchase protocol of CS. Then, the AC optimal power flow model is solved by second-order cone programming to obtain the marginal cost of power consumption at each bus of distribution network at different time. Based on the solution, a linearized congestion management model is established to calculate the distribution locational marginal price(DLMP). Finally, considering the parking characteristics of electric vehicles, in order to minimize the cost of electricity purchasing, a decentralized optimal dispatching model of CS is proposed and dispersedly solved according to the price signal. The simulation of power purchase strategy for CS on IEEE 33-bus distribution network system shows that the proposed strategy can achieve decentralized dispatching and optimize the power flow of the distribution network. Meanwhile, as a fair price signal, DLMP can guide CSs to charge orderly, which is able to reduce the cost of CSs and improve the utilization rate of chargers under conditions of safe and economic operation.
Real-time Optimal Dispatch for Large-scale Electric Vehicles Based on Dynamic Non-cooperative Game Theory
CHEN Lüpeng , PAN Zhenning , YU Tao , WANG Keying
2019, 43(24): 32-40.DOI: 10.7500/AEPS20181116007
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In order to solve the problem of optimal dispatch caused by conflicts of independent optimized dispatch targets between electric vehicle aggregators(EVAs)after the large-scale electric vehicle(EV)connected to the grid, a large-scale EV real-time dispatch model based on dynamic non-cooperative game considering the interests of EVA is proposed. Firstly, the cluster equivalent model of large-scale EV is constructed and the interest relationship of each EVA with dynamic electricity price mechanism is analyzed. Then the complete potential game theory is used to prove the existence of the unique Nash equilibrium solution of the game model and the solution is derived. Finally, a real-time distributed algorithm based on the alternating direction method of multipliers is proposed to solve the real-time decision problem of each EVA. The simulation results show that the model can effectively perform peak load shifting and reduce the charging cost of EVAs. Meanwhile, it is proved that the proposed model is more suitable for real-time optimal dispatch for the charging of large-scale EVs in terms of optimization results, computing time and protection of user privacy.

Editors Recommend

Key Technologies and Prospect for Coordinated Control and Protection in DC Distribution System
WANG Shouxiang , LIU Qi , XUE Shimin , YUAN Dong , WANG Chenqing , YANG Jinggang
2019, 43(23): 23-30.DOI: 10.7500/AEPS20190506005
[Abtract](557)[PDF](229)
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In DC distribution system, large number of power electronic devices increases the difficulty of DC protection for their vulnerability. However, based on the flexible and controllable power electronic devices, realizing quick recovery of fault by coordinated control and protection becomes an important idea in the research of DC distribution system. Firstly, the overall thought of coordinated control and protection in DC distribution system is summarized. Secondly, the influence of the structure and control strategy of sub-modules of converters on the fault characteristics in DC distribution system is analyzed. The protection principle of DC distribution system based on the idea of control and protection coordination is summarized, and the coordination process of control and protection in DC distribution system is analyzed. Finally, the research on the coordination of control and protection of the DC distribution system is summarized and prospected.
Application Scenarios and System Design of Medium-voltage DC Distribution Network
HAN Minxiao , XIE Wenqiang , CAO Wenyuan , ZHANG Wei , YANG Jinggang
2019, 43(23): 2-11.DOI: 10.7500/AEPS20190320004
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The application scenarios, basic characteristics and system design of medium-voltage DC distribution network are lack of systematic discussion. Firstly, the system characteristics of power supply capacity, interconnection, mutual support and short-circuit current suppression are discussed to show the application scenarios, characteristics and advantages of medium-voltage DC distribution network. Then, key technologies of design for medium-voltage DC distribution network are also given in the view of engineering realization, including the determination of voltage level, grid design, wire model and grounding mode selection. Finally, the problems that should be considered in the development and application of medium-voltage DC distribution system are presented.
Key Technologies and Development Prospect of New Generation Low-voltage DC Power Supply and Utilization System
MA Zhao , ZHAO Zhigang , SUN Yuanyuan , LI Yahui , LI Kejun
2019, 43(23): 12-22.DOI: 10.7500/AEPS20190905007
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Aiming at the current situation of energy revolution of the society and the development trend of power system, the characteristics, typical application scenarios, key technologies and development trend of new generation low-voltage direct-current(LVDC)power supply and utilization system are explored. Firstly, the characteristics of energy revolution and the development trend of power system in modern society are analyzed, the development demands of new generation LVDC power supply and utilization system containing power generation, energy storage and consumers are pointed out. The main characteristics and typical application scenarios of new generation LVDC power supply and utilization system are analyzed. Voltage levels, international standards and status of demonstration projects domestic and abroad of LVDC power supply and utilization system are introduced. The key technologies of future LVDC power supply and utilization system are arranged, and the development trend of LVDC power supply and utilization system is expected. Finally, the summary and suggestion of specific research proposals in the field of new generation LVDC power supply and utilization technology are given.
Protection Scheme and Device Development of Flexible DC Distribution Network
WU Tonghua , DAI Wei , LI Xindong , ZHENG Yuping , CUI Yu , YAO Gang
2019, 43(23): 123-130.DOI: 10.7500/AEPS20190428004
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The protection partition and protection configuration are studied based on the typical flexible DC distribution network. According to the fault characteristics of DC lines, the protection scheme of DC pole-to-pole short-circuit fault, single-pole grounding fault and broken line fault are analyzed, and a comprehensive fault location method based on differential protection and multi-point direction information is proposed. Based on the proposed protection and fault location scheme, the protection device of DC distribution network which has high sample rate and multiple kinds of analog input interfaces is developed. The test and dynamic simulation on real-time digital simulation(RTDS)system prove the feasibility of the protection scheme and correctness of the fault location method, and the action behavior and performance index of the developed protection device meet all the safety operation requirements of DC distribution network.
Reflections on Frequency Stability Control Technology Based on the Blackout Event of 9 August 2019 in UK
FANG Yongjie
2019, 43(24): 1-5.DOI: 10.7500/AEPS20191011006
[Abtract](179)[PDF](47)
Abtract:
On 9 August 2019, a blackout event with significant impacts occurred in the UK electric power system. According to the technical report submitted by the electricity system operator, UK, several separate and simultaneous events led to a large amount of sudden power deficiency that exceeds the requirements of the security and quality of supply standard(SQSS)in terms of the infeed loss that was required to be secured for. This caused a rapid fall in system frequency which eventually triggered the correct operation of the low frequency demand disconnection scheme, resulting in the supply disruption to a significant number of customers. This paper presents a description of the event evolution, conclusions and recommendations, based on the technical report. Several recommendations related to frequency stability control technology are then proposed, i. e. improvement of the accuracy and rapidness of load tripping as a control action, research on the control logics to block chain reactions, and enhancement of the system-level experimental verification for the dynamic behaviors of new power generation equipment.

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