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.

Integrated Operation and Maintenance Architecture and Key Technology of New Generation Dispatching and Control System
SUN Mingyang , YU Fang , ZHAO Jiaqing , ZHUANG Weijin , HU Jun , JI Huiying
2019/9/20 10:51:03  DOI: 10.7500/AEPS20190430010
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Along with the architectural evolvement of power grid dispatching control system (PGDCS), the structure of the new generation system becomes more complex and the interaction among application software are more closely. To satisfy the practical needs of system operation and maintenance, this paper analyzes the importance of the integration of operation and maintenance businesses, and proposes an integrated operation and maintenance solution that adapts to the system architectural change. Specifically, software and hardware architectures supporting integrated operation and maintenance are introduced, indexes on the evaluation of PGDCS operation status are presented, moreover, relevant key technologies including data acquisition from PGDCS, monitoring and pre-warning, as well as fault disposal to PGDCS are clarified.
An Inter-turn Protection and Dynamic Simulation Test of Pumped Windings of Energy-Extraction Reactor
LI Weiliang , YANG Hongtao , HAN Shijie , ZHAO Zhenxi , MO Pinhao , XING Wu
2019/9/20 10:37:25  DOI: 10.7500/AEPS20180905004
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Because the structure of energy extraction reactor is different from that of the reactor and the transformer, there is no consensus on how to protect the inter-turn fault of the auxiliary winding quickly,and its engineering applications are rare. According to the characteristics anlysis of triangular connection of three-phase auxiliary winding, a protection logic is proposed:the circulating overcurrent set as the action element, the zero-sequence overvoltage or the zero-sequence overcurrent set as the locking element. On the basis of the validity of the model of engineering products, a dynamic simulation testing scheme for inter-turn protection of auxiliary windings is proposed and the test results verify the rationality of the protection logic.
State Estimation for Three-phase Unbalanced AC/DC Distribution Network
MA Xin , GUO Ruipeng , LIU Jinsong , FANG Chen , ZHU Pengcheng , ZHANG Yadi
2019/9/20 10:29:37  DOI: 10.7500/AEPS20190424006
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Flexible DC technology based on Voltage Source Converter (VSC) is increasingly applied in distribution networks. Accurate static state estimation of the three-phase unbalanced AC/DC distribution network with VSC is needed. Firstly, the state estimation model of AC/DC distribution network considering the three-phase unbalance characteristics of distribution network is proposed. The weighted least absolute value method is used for state estimation. Secondly, the linear description of PMU measurement is given. In addition, the equations of PMU and SCADA hybrid measurements with various AC/DC devices are given. Finally, the effectiveness and practicality of the proposed method are verified on the three-phase unbalanced IEEE-33 bus AC/DC distribution network.
A Short Circuit Calculation Method for Unbalanced Distribution Network with Integration of Different Types of Renewable Energy
Liu Huiyuan
2019/9/19 13:36:44  DOI: 10.7500/AEPS20181003005
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Due to the complex coupling characteristics of?three-phase unbalanced?components, it is difficult to ?transform ?to positive, negative and zero-sequence components. Therefore, there is a problem of low calculation precision for the?traditional symmetric component method?when it is used in the unbalanced distribution network with?renewable energy. In addition, the fault current characteristics of the?DFIG?is based on the?low-voltage through control strategy, special structure and its own protection equipment. The fault current characteristics of the renewable energy are different from that of the traditional synchronous generator. Based on this, the equivalent calculation phase component models of new energy sources are analyzed according to the low voltage control strategies of different types of new energy sources. Then, based on the phase component analysis?method, a new fault calculation phase component models for unbalanced distribution network with different types of new energy sources is proposed according to the admittance matrix and voltage equation of the phase component.Finally, the validity and effectiveness of the proposed fault analysis methods have been verified by simulation cases.
Challenges and Prospects of Generalized Wind-Hydrogen-Coal Energy System
PENG Shengjiang , YANG Shuxia , YUAN Tiejiang , HU Kelin
2019/9/17 16:27:46  DOI: 10.7500/AEPS20181231003
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This paper focuses on the energy structure transformation in wind/coal-rich areas and analyze the current research on the Wind-Hydrogen-Coal Energy System (WHCES). The features of WHCES are concluded and the research obstacles are pointed out. A Generalized Wind-Hydrogen-Coal Energy System (G-WHCES) is improved based on the current WHCES. The basic concept and overall framework of such system is introduced. The differences between the G-WHCES and WHCES are compared on primary energy side, secondary energy side and load side. The necessity of such application in the energy structure transformation is stressed. The theoretical and technological challenges of such system during high renewable power penetration and insufficient regulating resource conditions are discussed. The results indicate that more focuses should be concentrated on the operational efficiency and system stability. And the system should be improved on: system structure design, control strategies, key sub-system design and system integration.
Views
Problems of Wireless Power Transmission Technology Urgent to Be Solved and Corresponding Countermeasures
ZHANG Bo , SHU Xujian , WU Lihao , RONG Chao
2019, 43(18): 1-12.DOI: 10.7500/AEPS20181218007
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This paper first analyzes the current commercialization situation, the formulation of product standards, the publication status of academic papers and patents of wireless power transmission technology at home and abroad. Then, it discusses the existing problems of the two types of most popular wireless power transmission technologies, i. e. inductively coupled wireless power transmission and magnetically coupled resonant wireless power transmission, and then puts forward their differences in principle, structure and characteristics, which is aimed to resolve the confusion of inductively coupled and magnetically coupled resonant wireless power transmission technologies to promote the further development of wireless power transmission technology. Finally, based on the bottleneck of the development of existing wireless power transmission technology, two new types of wireless power transmission technologies are introduced based on the fractional-order circuit theory and parity-time-symmetric theory. It is pointed out that a fundamental breakthrough in mechanism is important for the wireless power transmission technology to become a general technology.
Special Topics
Statistical Analysis and Suggestions on Resistance Measures for Commutation Failures of HVDC Transmission System
RUAN Siye , XU Kai , LIU Dan , LYU Pengfei , WANG Delin , WANG Huafeng
2019, 43(18): 13-17.DOI: 10.7500/AEPS20190130006
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With the continuous operation of ultra-high voltage direct current(UHVDC)project and the increase of commutation capacity, the impact of commutation failure on the active and reactive power of power grid is more severe, which seriously threatens the safe and stable operation of large power grid. This paper makes a statistical analysis of commutation failures in 21 high-voltage direct current(HVDC)transmission systems of the State Grid Corporation of China and summarizes the main factors affecting the probability of commutation failures. Based on the conclusion of statistical analysis, from two aspects of reducing the probability of commutation failure and energy shock, some technical measures such as optimization of thyristor switching characteristics, intelligent monitoring control of commutation failure of converter valve and energy absorption after commutation failure, are put forward, which can provide reference for further research and engineering application of resistance measures for commutation failure.
Basic Research
Day-ahead Scheduling Method of Power-to-gas System Considering Operation Characteristics of Water Electrolysis and Methanation
YU Juan , SHI Quanyan , YANG Zhifang , DAI Wei , WANG Xuebin
2019, 43(18): 18-25.DOI: 10.7500/AEPS20181221003
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Power-to-gas(P2G)system mitigates the curtailment of wind and photovoltaic power by using surplus electricity of renewable energy. The scheduling results of existing methods which ignore the operation states of the water electrolysis and methanation units in the P2G system are greatly deviated from the actual situation. In order to solve the problem, a refined day-ahead scheduling method for P2G system is proposed. The proposed method considers the nonlinear relationship between flow rate of hydrogen production and power consumption in the model of water electrolysis. Besides, the time and energy consumption characteristics of multi-state transition in start-stop process are included in the methanation model. In addition, the scheduling model takes the regulation effect of hydrogen storage device between water electrolysis and methanation unit into account. The day-ahead scheduling method considering the operation characteristics of water electrolysis and methanation can effectively reflect the actual operation of P2G system and realize the efficient utilization of P2G system. Simulation results demonstrate the effectiveness of the proposed method.
Enhanced Security-constrained Optimal Power Flow Considering Dynamic Thermal Rating of Transmission Lines
LOU Xiansi , WANG Luyu , GUO Chuangxin , SHI Yunhui
2019, 43(18): 26-34.DOI: 10.7500/AEPS20190429012
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Faced with the complex internal and external risks, the random failures from electric transmission and transformation equipment have become a significant factor affecting the safe operation of power grids. Aiming at the lack of flexibility or security for the existing security-constrained optimal power flow models, an enhanced security-constrained optimal power flow(ESCOPF)model is proposed. The technology of dynamic thermal rating of transmission lines is applied to ensure the safe operation of power grids after the occurrence of credible contingencies and before the intervention of corrective control. In addition, an algorithm based on Benders decomposition is proposed. It can divide the original problem into the main problem of preventive control, sub-problems of dynamic thermal rating check and corrective control feasibility check. The Benders cuts are continuously returned back to the main problem to modify the generation plan of generator units until the optimal generation plan satisfying all check sub-problems can be finally obtained. The results of case studies indicate that the ESCOPF model can fully utilize the transfer capability of lines, enlarge the safe range of operation and improve the operation economy of power grids.
Three-phase Robust Dynamic Reconfiguration of Distribution Network to Improve Acceptance Ability of Distributed Generator
ZHAI Hefeng , YANG Ming , ZHAO Ligang , DAI Zhongfu , DU Pingjing , CHEN Yan
2019, 43(18): 35-42.DOI: 10.7500/AEPS20181209001
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Uncontrollable distributed generators(UDGs)introduce significant power fluctuation and uncertainty to active distribution network(ADN). To absorb more UDGs, topology of ADN should be reconfigured dynamically with respect to the operation conditions. Moreover, since distribution systems are featured by load unbalance in phases, a three-phase unbalanced reconfiguration model is also desirable in practice. An adjustable two-stage robust optimization approach is proposed for the dynamic reconfiguration of a three-phase unbalanced ADN. In the first stage, the ADN topology is optimized for the entire look-ahead periods to minimize the daily switching cost and maintain the radial structure of the network. In the second stage, a three-phase dynamic optimal power flow is executed to minimize the worst operation cost based on the given network topology and the uncertainty set of UDG outputs. The two-stage robust dynamic reconfiguration model is solved by using column-and-constraint generation algorithm, where the main problem and sub-problems are both formulated as a mixed-integer linear program by applying a linear three-phase power flow model. Test results on modified IEEE 34 bus and IEEE 123 bus system verify the effectiveness of the proposed approach.

Editors Recommend

Complexity of Influence of Generator Inertia on Transient Angle Stability
ZHU Xueqiong , XUE Yusheng , HUANG Tiangang
2019, 43(17): 72-77.DOI: 10.7500/AEPS20190615003
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With the advancement of energy transition, wide concern has been aroused for the influence of the declining inertia of the power system on the transient angle stability due to the large-scale wind power and photovoltaic power generation connected to the power grid. It does not conform to the nature of the problem when the qualitative influence of the generator inertia on the transient angle stability is analyzed from the perspective of the sending and receiving subsystems of the power grid. Instead, based on extended equal area criterion(EEAC), the paper analyzes the influence of the change in the equivalent inertia of the complementary-cluster on the transient stability margin of the dominant image system. Due to the different impacts of the fault scenarios on the transient flow of the complementary-cluster image system and the interaction of the above two effects, the complexity of the influence of the generator inertia on the transient angle stability is caused. The law is discussed through the analytical analysis and numerical simulation based on the two-machine Hamiltonian system.
Statistical Analysis and Suggestions on Resistance Measures for Commutation Failures of HVDC Transmission System
RUAN Siye , XU Kai , LIU Dan , LYU Pengfei , WANG Delin , WANG Huafeng
2019, 43(18): 13-17.DOI: 10.7500/AEPS20190130006
[Abtract](349)[PDF](156)
Abtract:
With the continuous operation of ultra-high voltage direct current(UHVDC)project and the increase of commutation capacity, the impact of commutation failure on the active and reactive power of power grid is more severe, which seriously threatens the safe and stable operation of large power grid. This paper makes a statistical analysis of commutation failures in 21 high-voltage direct current(HVDC)transmission systems of the State Grid Corporation of China and summarizes the main factors affecting the probability of commutation failures. Based on the conclusion of statistical analysis, from two aspects of reducing the probability of commutation failure and energy shock, some technical measures such as optimization of thyristor switching characteristics, intelligent monitoring control of commutation failure of converter valve and energy absorption after commutation failure, are put forward, which can provide reference for further research and engineering application of resistance measures for commutation failure.
Mechanism and Suppression Strategy of Capacitor Voltage Fluctuation Difference in Hybrid Multilevel Modular Converter
LU Feng , LI Yu , FAN Qiang , ZHAO Chengyong , XU Jianzhong , QU Haitao
2019, 43(17): 92-101.DOI: 10.7500/AEPS20190325003
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Reducing the amplitude of the capacitor voltage ripple of the sub-module in the multilevel modular converter(MMC)is expected to reduce the capacitance, volume and cost of the sub-module capacitor, and has important research value. This paper analyzes the characteristic of the capacitor voltage fluctuation and the fluctuation difference between half-bridge and full-bridge sub-modules with over-modulation in hybrid MMC, which determines the corresponding energy accumulation interval. Then, the extreme point distribution and zero crossing point distribution of the arm voltage reference with the third harmonic voltage injection are discussed. The relationship among the injection coefficient of third harmonic voltage, the modulation index and the fluctuation difference suppression capability is established. Aiming at reducing the difference of capacitance energy accumulation between half-bridge and full-bridge sub-modules, the third harmonic voltage injection quantity is optimized, and the suppression strategy of capacitor voltage fluctuation difference based on the third harmonic injection optimization is proposed. Then an example of calculation for reducing the capacitance is presented. Finally, the correctness and validity of the proposed strategy are verified by the simulation of double-end hybrid MMC in PSCAD/EMTDC.
Key Technology and Application of Energy Internet Oriented to New-type Towns
ZHENG Yuping , WANG Dan , WAN Can , YANG Zhihong , CHEN Jingcheng , LI Jingru , WU Lin
2019, 43(14): 2-15.DOI: 10.7500/AEPS20181130012
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Energy Internet oriented to new-type towns possesses the characteristics of multi-energy coordination and open transaction. Energy Internet technology could change the way of energy utilization for urban users, and it would become one of the effective ways of solving future urban energy issues in the urbanization process of China. This paper analyses some key scientific problems of Energy Internet oriented to new-type towns from two aspects: planning and optimized operation of multi-energy coupled integrated energy system, uncertainty prediction of distributed multi-energy “source-load” and market transaction. On this basis, the key technology and application research framework of Energy Internet oriented to new-type towns are presented. Furthermore, this paper proposes details and research routes for key technologies of Energy Internet oriented to new-type towns, including interconnection and interactive planning of multi-energy networks, optimized scheduling towards multiple agents, distributed energy transaction and multi-energy market mechanism, comprehensive evaluation of all energy links, interactive energy equipment with multi-energy access and coordinated operation, and construction methods of typical demonstration project.
Architecture of Online Analysis System for Power Grid Oriented to Rapid Response
ZHAO Lin , ZHOU Mike , FAN Zelong , FENG Donghao , YUAN Qihai
2019, 43(18): 95-101.DOI: 10.7500/AEPS20180612003
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Aiming at the high time-efficient demand for online analysis in the operation of the current regulatory system for power grid, the technologies of streaming data processing, distributed real-time database and in-memory data grid are comprehensively studied. System architecture for optimizing the online analysis rate is proposed and a set of online analysis system for power grid oriented to rapid response based on the above architecture is established. The system can effectively shorten the overall time of online analysis from data acquisition to completion analysis, so that it could quickly track the changes of grid operation mode.

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