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

Volume 41,Issue 24,2017 Table of Contents

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Design of Electricity Market Mode and Mechanism and Key Technologies in a New Round of Electricity Market Reform
Guest Chief Editors' Note
XIA Qing, CHEN Qixin
2017, 41(24): 1-1.DOI: 10.7500/AEPS20171116011
[Abstract](2399)[PDF 960.42 K](797)
Development of Unified European Electricity Market and Its Implications for China
LI Zhu, PANG Bo, LI Guodong, FAN Menghua, QU Haoyuan
2017, 41(24): 2-9.DOI: 10.7500/AEPS20170614004
[Abstract](1878)[PDF 2.96 M](3537)
Currently a new round of electricity market reform is being deepened in China. Based on the energy and consumption distribution in China, it is a major tendency to establish a nationwide electricity market in China. Since the last decade, Europe has been striving to build a unified electricity market across the countries. The experience of European unified electricity market can provide inspirations for the Chinese electricity market design. Firstly, the background and structure of European unified electricity market are summarized, including market structure, products and congestion management methods. Secondly, the implications of European unified electricity market are analyzed. Finally, some suggestions are proposed for the future electricity market design in China.
Optimization and Design of Construction Route for Electricity Market in China
GE Rui, CHEN Longxiang, WANG Yiyu, LIU Dunnan
2017, 41(24): 10-15.DOI: 10.7500/AEPS20170601008
[Abstract](1728)[PDF 1.32 M](1241)
The electricity market construction has the top priority in the new round of electricity market reform. In order to smoothly transfer the planned mode of power systems to a market mode, and reach a perfectly target electricity market model, a reasonable electricity market is critical. Based on the analysis on operation status of electric power system in China, the electricity market basic mode and foreign electricity market construction experiences, etc. , the evaluation indexes of construction route optimization suiting the Chinese electricity market is established. On this basis, this paper demonstrates the feasibility of the electricity market construction carrying out the medium and long-term electricity trading before the spot transactions. The specific implementation of construction route is designed and the critical technology issues in the implementation process is discussed. Furthermore, considering the contradiction of China's new energy consumption and the power network security constraints, etc. , this paper suggests that a mode of “medium and long-term electricity transaction plus balanced scheduling” should gradually transfer to “long-term contracts for difference plus centralized spot market”, and the auxiliary service market and electricity futures market should be built timely to achieve the goal of complete market system.
Discussion on Pattern and Path of Electricity Spot Market Design in Southern Region of China
LIANG Zhifei, CHEN Wei, ZHANG Zhixiang, DING Junce
2017, 41(24): 16-21.DOI: 10.7500/AEPS20170614015
[Abstract](1625)[PDF 1.34 M](1410)
Through analyzing the limit of power generation resources optimization after the electricity market in a province developing to a certain stage and the contradiction between medium and long term electricity exchange and dispatch, the necessity of developing electricity spot market in the southern China region is proposed. By drawing on the design experience of foreign regional spot market, and considering the domestic “a province as an entity” economic pattern, “West to East” national strategy, the characteristics of two-level dispatching situation, and the characteristics of the electricity market design in each province, it is pointed that the regional spot market in the southern China region should choose a regional spot market mode with balanced partition. Southern regional spot market should start from incremental spot market, and gradually increase the proportion to the regional market integration development. Finally, market rules and supporting mechanism design, the suggestions for the development of the spot market in southern region of China are proposed for trading platform construction.
Brief Analysis on the Philippine Electricity Market with Inspiration to China
WENG Weihua
2017, 41(24): 22-26.DOI: 10.7500/AEPS20170531013
[Abstract](2252)[PDF 1.40 M](1989)
The process of electricity market reform in Philippines is briefly introduced. The formation, trading mechanism, and market operation process of the Philippine electricity market are mainly introduced. Its operational experience of spot market by separating system operator(SO)and market operator(MO)are analyzed. Several features of the Philippine electricity market, such as whole energy bidding, net settlement, locational marginal price, planned co-optimization of energy market and reserve market, and two-settlement system are illustrated. Finally, some inspiration to China is given in the fields of market registration, trading organization, transaction execution, transaction settlement, information disclosure, and the construction of technical supporting system.
Design and Application of Electricity Market Mechanism for Yunnan Based on Theory of Incentive Compatibility and Game in Depth
YANG Qiang, CAI Huaxiang, YAN Minghui, ZHANG Maolin, LIU Shuangquan, XING Yuhui
2017, 41(24): 27-34.DOI: 10.7500/AEPS20170605022
[Abstract](1541)[PDF 1.30 M](979)
According to the structure of energy, economy, power grid and market of Yunnan province in China, the new electricity market structure, trading mechanism and information disclosure mechanism are designed based on the theories of incentive compatibility, game in depth and information asymmetry. The three-step trading system of “point-to-point”, “back-to-back”, “face-to-face” is put forward to achieve a trading mode centered on long-term transactions and supplemented by short-term transactions. Monthly bilateral transactions are carried out on the basis of the annual bilateral transactions and the price adjustment mechanism is designed to make the “point-to-point” bilateral trade more flexible. Declaring multi-block and multiple prices is allowed to improve the close rate of “back-to-back” centralized trading. Transaction opportunities of “face-to-face” self-listed trading are increased by giving buyers and sellers the rights to take turns. Day-ahead transactions are introduced to help the market subject control bias and improve the contract compliance rate. Yunnan electricity market mechanism has achieved good practical results. In 2016 Yunnan market transaction power reached 59 TW·h. The overall contract compliance rate was more than 96%. The proportion of clean energy power generation reached 92. 7%. Thus the Yunnan electricity market model is becoming more and more mature.
Clearing Model of Electricity Spot Market Considering Flexible Block Orders
ZHANG Xinyu, CHEN Qixin, GE Rui, ZHAO Xingquan, LI Mingdi, ZOU Peng
2017, 41(24): 35-41.DOI: 10.7500/AEPS20170614006
[Abstract](1722)[PDF 1.21 M](1261)
In the abroad electricity spot market, a flexible block order is the new designed transaction category in the bidding mechanism. It allows the market members to select the diversified and personalized transaction mode according to the technical characteristics of the power generation and the actual demand of the electricity, which enriches the liquidity of trading market. This kind of mechanism has the reference value for China to carry out the construction of electricity spot market pilot. Therefore, the operating mechanism of the Nordic electricity spot market is briefly introduced, and the definition and characteristics of trading varieties including hour order, flexible order and block order in the spot market are described. On this basis, a clearing model for electricity spot market with the complex bidding of flexible block order is established combined with the design of the spot market transaction mechanism. Since the model belongs to the multi-period, large-scale and nonlinear mixed integer programming problem, a linear modeling method to reduce the nonlinearity of the model is proposed to improve the efficiency of the model. Finally, the example analysis is given to illustrate the correctness and validity of the proposed model and the solving method.
Simulation Experiment Analysis on Market Rules for Monthly Centralized Bidding
JING Zhaoxia, ZHU Jisong
2017, 41(24): 42-48.DOI: 10.7500/AEPS20170615022
[Abstract](1565)[PDF 1.71 M](876)
An agent-based computational economics(ACE)experiment featuring simulation is an important method for the evaluation of the market rules. JADE framework is used for simulation system implementation. In order to study the rules of centralized bidding for monthly electricity market in China, three simulation schemes are designed. The impact of different rules on market performance is studied. This paper focuses on the two market clearing price rules, i. e. the universe electricity market clearing price rule in which the clearing price is defined at the intersection of the supply demand curves and the clearing price rule under implementation in monthly centralized bidding market of Guangdong Province, China. And some analyses and discussions have been carried out. The simulation results show that the clearing price rule defined in monthly centralized bidding market will lead to an increase in market game intensity but a decrease in converge speed. The difference between the market performances of two clearing rules becomes slight as the supply demand ratio increases. At the same time, the deviation penalty rule will influence the bidding strategy of the buyer, and then the market clearing price goes higher. Finally, suggestions are put forward according to the actual construction of electricity market in China.
Information Disclosure System in American Electricity Market and Its Enlightenment for China
MA Ziming, ZHONG Haiwang, LI Zhu, WANG Yang, XIA Qing
2017, 41(24): 49-57.DOI: 10.7500/AEPS20170918005
[Abstract](1697)[PDF 1.38 M](1280)
The information disclosure system of the electricity market in America is investigated from the national and regional levels. On the national level, the general situation of electricity, the electricity production and consumption, the electricity market operation and environmental information disclosed by United States Energy Information Administration are introduced in details. The institutional consideration of the disclosure in the national level is analyzed. On the regional level, PJM electricity market is taken as an example. The information disclosure of energy market and ancillary service market in PJM is introduced in details and analyzed, which includes system operation information, market price, market supply and demand situation, bid data and market structure information. Considering China's national conditions, the policy suggestions of information disclosure system are then proposed. The information disclosure on the national level which takes the guide of resources to flow across regions as the core and that one on the provincial level which proves the credibility of the market operator and improves the provincial market efficiency should be established.
Influence of Pricing Parameters on Transmission and Distribution Price and Its Regulation Model
LIU Siqiang, YE Ze, FAN Xianguo, YAO Jun, WU Yongfei
2017, 41(24): 58-66.DOI: 10.7500/AEPS20170611009
[Abstract](1257)[PDF 1.36 M](1079)
Based on the pricing method of transmission and distribution price at the provincial power grid, the pricing model of transmission and distribution is optimized by introducing adjustable parameters. Firstly, the properties, the inner contact and the mechanism of the pricing parameters, which will affect the level of the transmission and distribution price, are analyzed. Then the parameter change conditions of triggering the balanced account and the price adjustment mechanism are pointed out. The parametric adjustment and control model for transmission and distribution price regulation is developed. Finally, the sensitivity analysis of pricing parameters is carried out by drawing on the data of Hubei Province, and the degrees of influences of the electric quantity and the main parameters on the level of the transmission and distribution price are analyzed. According to the concrete calculation of parameter regulation under the policy target of price, the regulation strategy is discussed. As the influence of the parameters on the level of the transmission and distribution price are significantly different under the price cap regulation, the authorities of price department need to choose different parameters or multiple parameter combinations to formulate the corresponding regulatory scheme to achieve the regulatory objectives.
Discussion on Architecture of New-generation Electricity Trading Platform
SHI Lianjun, SHAO Ping, ZHANG Xian, HUANG Longda, GENG Jian, YE Fei
2017, 41(24): 67-76.DOI: 10.7500/AEPS20170614003
[Abstract](1906)[PDF 1.93 M](1470)
Along with the new round of electricity market reform, the supply of electricity has been gradually transformed from traditional planning mode to market trading mode. Faced with complex market variations, the technical support system of electricity trading has made some new requirements regarded as the joint operation of “spot + medium and long term” market, the Internet-oriented high concurrent access, the standardized market model, the external system information exchange and the transaction security guarantee. In addition, a four-major-application business architecture is proposed, which is adapted to the characteristics of China's electricity market, with a two-tier-coordination platform architecture based on “hybrid cloud”. Finally, the key technical problems that need to be solved in system expansion are discussed.
Application and Suggestions of Power System Production Simulation in Deregulated Electricity Market
GU Yingzhong, LI Huijie, SHI Baozhuang
2017, 41(24): 77-82.DOI: 10.7500/AEPS20170615023
[Abstract](1862)[PDF 1.35 M](861)
During the 30 years of electricity market deregulation in North America and Europe, power system production simulation plays a critical role as a core technology to address the challenges in power grid operation and planning. This paper addresses the concept, structure, and mathematic models of power system production simulation. Many applications are analyzed, especially under deregulated market environment. This paper also reveals the value of production simulation applications in China and discusses the potential challenges to be encountered. It is proposed to adopt advanced production simulation technology in power system planning and electricity market mechanism design in order to facilitate scientific quantitative approach based analysis and contribute to this round of electricity market reform in China.
Design Ideas of Electricity Market Mechanism to Improve the Accommodation of Clean Energy in China
SHI Lianjun, ZHOU Lin, PANG Bo, YAN Yu, ZHANG Fan, LIU Jun
2017, 41(24): 83-89.DOI: 10.7500/AEPS20170614002
[Abstract](2410)[PDF 1.37 M](1510)
In recent years, the contradictions in clean energy accommodation have become increasingly prominent in China. A new round of electricity market reform has provided the good opportunity to solve this problem. Based on the analysis of the requirements for the new round electricity market reform and considering the current situation of the construction of electric power market and advancing procedure in China, the market mechanism is designed step by step to promote the clean energy accommodation. Recently, the renewable energy directly has participated in the market mechanism such as the inter provincial power generation right transaction model, the direct electricity transactions model to promote the transmission of renewable energy between provinces, the long-term contracts including differential contract mechanism and premium mechanism. Finally, the suggestions of promoting China's new energy absorption policy and market mechanism in the environment of electricity market construction are proposed.
Incenting Demand and Supply of Renewable Energy with Renewable Portfolio Standard: Mechanism Design of National Renewable Energy Market
MA Ziming, ZHONG Haiwang, TAN Zhenfei, XIA Qing, WANG Yang
2017, 41(24): 90-96.DOI: 10.7500/AEPS20170409004
[Abstract](1847)[PDF 1.53 M](825)
In response to the challenge of renewable energy accommodation in China, the mechanism design of national renewable energy market(NREM)is proposed. The coordinating mechanism between the NREM and provincial day-ahead market is designed. The national green certificate market is proposed. A settlement mechanism for electricity quantity deviation is proposed to incent renewable energy farms to improve their forecast accuracy. On the national level, the NREM clearing model is constructed. The objective is to maximize the total surplus and to incorporate the transmission cost. On the provincial level, a multi-objective day-ahead market clearing model is established. The NREM clearing results are taken as relaxed boundaries. The case study verifies the effectiveness of the proposed mechanism. The proposed mechanism can incent the demand and supply of renewable energy with renewable portfolio standard, help discover the true cost of renewable energy and the positive externalities of the renewable energy, guide renewable energy and power grid planning, and encourage market participants to improve their forecast accuracy.
System Dynamics Based Analysis on Incentive Mechanism of Distributed Renewable Energy Resources
ZHAO Shengnan, WANG Beibei, LI Yang, SUN Min, ZENG Wei
2017, 41(24): 97-104.DOI: 10.7500/AEPS20170517013
[Abstract](2513)[PDF 3.54 M](921)
National and local clean energy development policies facilitate a spurt growth in installed capacity of clean energy. Although both carbon emission trading(ET)and tradable green certificates(TGC)trading can promote clean energy development, there are some differences between the effects on distributed and centralized renewable energies. Based on the conduction process analysis of the certificate cost, system dynamics method is used to build models in both wholesale market of centralized renewable energies and retail market of distributed renewable energies, respectively. The interaction model among TGC market, ET market and electricity market are built and the distribution system model containing distributed renewable energies is established as well. The developmental trajectories of centralized and distributed renewable energy are simulated and the influence on distributed renewable energy of TGC and ET price setting is also analyzed. On this basis, the facilitation on distributed renewable energy by the proposed incoming sharing mechanisms is verified.
Settlement Compensation Mechanism of Power Trading Deviation with Promotion of Renewable Energy Consumption
LIU Dunnan, TANG Honghai, YANG Mo, LI Quanmao, XU Liang, ZHANG Shengnan
2017, 41(24): 105-111.DOI: 10.7500/AEPS20170615020
[Abstract](1959)[PDF 1.41 M](942)
The proportion that renewable energy participates in the market transactions continues to increase. However, renewable energy has many characteristics such as strong volatility, poor prediction accuracy and so on, causing uneven distribution of cardinal electricity quantity among renewable energy power plants, low consumption ratio of renewable energy and other issues. As a result, design of renewable energy power plants to participate in the electricity market trading bias settlement model is particularly critical. The method of substitute compensation for renewable energy is put up according to the present situation of the renewable energy. Firstly, the actual generation of the renewable energy plant should minus the beforehand contract generation and make sure the base power generation according to installed capacity of units. Then, the comprehensive unit price of the renewable energy power plant settlement is determined based on electricity quantity and electricity prices in market transaction, and the economic compensation for less power plants from excess power plants is calculated. Finally, a specific example is given to show that the method can make the power plant with a high market share to obtain high profits, while the monthly power transaction execution is guaranteed.
Path-optimized Modeling and Algorithm for Trans-regional and Trans-provincial Electricity Trading Considering Clean Energy
ZHENG Yaxian, CHENG Haihua, YANG Zhenglin, GENG Jian
2017, 41(24): 112-119.DOI: 10.7500/AEPS20170615010
[Abstract](1590)[PDF 1.29 M](821)
Owing to the reverse distribution of energy supply and demand, and the different economic development levels in different areas in China, it's important to optimize trans-regional and trans-provincial transmission power to realize the global optimization of the generation sources in the wider areas of the whole country. The point-arc-model based path-optimization model for trans-regional and trans-provincial electricity trade taking into account multi-component clean energy is developed based on the different optimization targets, including maximum social benefits, minimum loss costs, and maximum volume, and realizing the electricity-trading-path optimization with constraints such as the period coupling, volatility and the transmission channel capacity, etc. The trans-regional and trans-provincial arc-path optimization model is also proposed to solve the difficult power-ring-routing optimization problem in the point-arc model. The simplified network model based on the backbone ultra-high-voltage power grid of China is adopted to implement the calculation that proves the validity of the proposed model and algorithm.
Two-stage Decision-making Method of Retailers Considering Power Transfer Strategy
YANG Yangfang, LIU Jichun
2017, 41(24): 120-128.DOI: 10.7500/AEPS20170612008
[Abstract](1446)[PDF 3.17 M](670)
Retailers in the sale side market may face strict power deviation assessment for low electricity consumption or load forecasting errors, which may lead to greater losses. For this problem, before the day-ahead trade, based on the scenario analysis method, a day-ahead optimization model is built by using the cost expectation of the retailers as an objective, which includes the cost of interruptible load and power transfer strategy. Then after the market clearing, according to the market clearing price, the interruptible load and power transfer strategy are optimized and updated to further reduce the power deviation. When settling the power costs, Shapley value and minimum costs remaining savings(MCRS)method are adopted to allocate the cost of the retailers individually. The influence of the interruptible load and power transfer price on the costs of the retailers with power deviation in different scenarios is analyzed by case studies. In addition, the results verify the applicability of two cost allocation methods.
Game Among Multiple Entities in Electricity Market with Liberalization of Power Demand Side Market
ZENG Jiazhi, ZHAO Xiongfei, LI Jing, LI Gang, LI Kangjing, WEI Zhenbo
2017, 41(24): 129-136.DOI: 10.7500/AEPS20170616005
[Abstract](1506)[PDF 1.50 M](1060)
To ensure the successful execution of the new electricity market reform, it is significant to conduct the research on the interest conflict under the new structure market among different entities especially the exactly conflicting interest between the electricity sales company and some other entities. Based on the proposed relationship establishment of electricity market structure under the new environment, a multi-agent technology is adopted to develop the game framework of multiple market entities including the power generation companies, electricity sales companies, and market end-users(compared with non-market users). Then considering on each entity's characteristic and transaction rules and the interaction relationship among multiple entities, a market game model with the aim of entity revenue function is designed. Finally, the electricity trading price and electricity quantity of power generation companies and electricity sales companies under the bilateral contract market and the centralized trading market are optimally solved by the reinforcement learning method. Simulation results show that the market profits and share of the power generation companies and the electricity sales companies mainly depend on the rational distribution of the selling and purchasing power in the bilateral contract market and the centralized trading market. With the advance of the game process and the increasing transparency of the market information, the power price and the profit will gradually tend to be stable.
Design and Exploration of Renewable Portfolio Standard in Power Demand Side in China
FENG Yi, LIU Qiuhua, LIU Ying, WANG Shuai
2017, 41(24): 137-141.DOI: 10.7500/AEPS20170615014
[Abstract](1758)[PDF 1.37 M](889)
The initiative of renewable power accommodation can be improved effectively by implementing the renewable portfolio standard(RPS)in power demand side. With the opening-up of power demand side, it is necessary to carry out the research on RPS applied in the China's power demand side. For summarizing and comparing the existing RPS implemented in the power demand side in five countries or regions, six key indices are selected, i. e. the obligation subject, the operating mode, the cost digestion mode, the renewable power target form, the index decomposition principle and the incentive degree. Considering the actual situation in China, the feasibility of the RPS in demand side and its potential risks are analyzed and the development frame and suggestions for the RPS implemented in the power demand side are offered.
Application Research
Protection Scheme and Device Development for Half-wavelength AC Transmission Lines
WU Tonghua, HONG Feng, ZHENG Yuping, LIU Huanzhang, LIN Xiangning, WANG Xingguo
2017, 41(24): 142-149.DOI: 10.7500/AEPS20170824006
[Abstract](1418)[PDF 1.40 M](918)
The fault characteristics of half-wavelength transmission line with long transmission distance are significantly different from those of conventional ones. To meet the challenge, a practical protection scheme of half-wavelength transmission line is designed based on the principle of half-wavelength protection such as free wave energy protection, synchronous differential impedance protection, false synchronous differential impedance protection, etc. The proposed scheme forms a system that the single terminal protection clears the near-terminal fault with high speed operation and the remote two-terminal protection achieve rapid fault clearing for whole lines. Since the half-wavelength transmission line protection algorithm has the disadvantages of complex, large amount of calculation, high sampling rate and long channel delay, several key technologies are proposed such as hardware architecture based on CPU and double-DSP, split core processing and split dispatching cycle processing of protection logic and rollback mechanism of false synchronous differential impedance protection sampled data. The complete protection implementation scheme of half-wavelength transmission line protection is formed. At last, the real time digital simulation(RTDS)test and dynamic simulations prove that the protective action and performance index meet all the safety operation requirements of half-wavelength transmission line.
Touching Fault Analysis and Clearing Action Strategy for AC/DC Crossed Transmission Lines
XUE Haiping, WANG Junsheng, ZHANG Shaofan, WANG Yulong, BAI Chuanjun, CAO Jie
2017, 41(24): 150-158.DOI: 10.7500/AEPS20170301001
[Abstract](1098)[PDF 1.58 M](845)
AC transmission lines often cross DC transmission lines in the AC/DC hybrid power system, which will easily cause a touching fault between the AC transmission line and the DC transmission line. In regard to two different clearing actions for AC/DC transmission lines touching fault used in HVDC transmission projects of State Grid Corporation of China(SGCC)and China Southern Grid(CSG), this paper analyzes the hidden problems of two different clearing actions. Under a forever touching fault, a DC overvoltage appears after blocking the converter by using clearing actions of the CSG project. The initial restart logic is in fact disabled by using the clearing actions in SGCC projects. According to the analysis of the characteristics of AC/DC transmission lines touching fault, this paper proposes a suggestion on the clearing action: AC protections trip and isolate the fault while DC protections only set an alarm for a touching fault. The EMTDC simulation experiments show that it is a proper clearing action suggestion. Simulation experiments using differential blocking methods or setting multi-line touching fault are also included.
Optimization and Improvement Strategy for Direct Current 50 Hz Protection Using Waveform Recognition
LI Xiaohua, WU Jiaqi, DING Xiaobing, WU Lizhu, ZHANG Dongyi, CAI Zexiang
2017, 41(24): 159-163.DOI: 10.7500/AEPS20170218003
[Abstract](1084)[PDF 1.40 M](1728)
Combined with direct current(DC)50 Hz protection action events caused by transformer inrush current occurred in China southern power grid in recent years, the waveform characteristics difference of inrush current, sympathetic inrush current and fault current are simulated and studied. Under the principle of without reducing sensitivity of the protection, an optimization and improvement strategy for DC 50 Hz protection based on waveform recognition is proposed. A DC 50 Hz protection lockout model is designed and developed in the PSCAD/EMTDC control and protection simulation model based on the optimization and improvement strategy. The proposed strategy is verified by means of simulation from the change of the alternating current system strength, no-load closing angle of converter transformer and core remanence of converter transformer. The results show that the proposed strategy can realize the blocking and unlocking of DC 50 Hz protection correctly, which solves the misoperation problem of DC 50 Hz protection caused by inrush current of the transformer without affecting the safety and stability of the DC system, and it has some reference significance to the research work and protection design.
CIM/G Based Multi-version Management and Display of Graphics
XU Hua, NING Jian, HUANG Kun, ZHANG Yong, JIANG Changming, ZHANG Zhe
2017, 41(24): 164-169.DOI: 10.7500/AEPS20170316004
[Abstract](1166)[PDF 1.35 M](762)
In view of the inadequacy of graphic management and display based on time dimensions in the smart grid dispatching and control system, this paper proposes a multi-version management and display technology of graphics based on CIM/G. The method takes the use of CIM/G files as the lasting storage medium of multi-version graphics, and divides the corresponding graphic version marks according to model version number to realize incremental storage of variable graphics and the security isolation among multiple versions. And then the technical scheme of constructing and managing multi-version graphics are realized. Also proposed is the way to browse an arbitrary graphic version, and realize centralized display between different graphic versions. This technology has become a pilot application in North China Electric Power Control Sub Center, which meets the demands of multiple business applications towards multi-temporal version graphics, and enhances the control ability of system control to create, demonstrate, store the future graphic version, etc.
A Path Searching Algorithm for Distribution Network Based on Network Simplification and Depth First Traversal
XU Chengsi, DONG Shufeng, SUN Zhou, LI Chunxiao, SUN Ming
2017, 41(24): 170-176.DOI: 10.7500/AEPS20170605015
[Abstract](1289)[PDF 1.36 M](910)
The power supply paths play an important role in the distribution network analysis. However, the distribution network is often complex in practice and it is necessary to simplify the distribution network model before searching the power supply paths. A simplified method of distribution network model based on common information model(CIM)and a path searching algorithm for distribution network based on the depth first traversal in the network simplification results are proposed. Firstly, the distribution network model is stored in a graph data structure and the network is simplified by using the graph theory algorithms. Subsequently, all the power supply paths of load nodes are searched in the distribution network by the path searching algorithm and classified into three categories of path sets respectively in terms of electric source, the load at the end of paths and the branch which the paths pass through. The path searching algorithm can be applied to the distribution network analysis such as describing the topological structure of the distribution network and the state of the branch switches. Finally, a typical distribution network framework in a provincial capital and IEEE network with 123 nodes are taken as examples to validate the effectiveness and practicability of the proposed network simplification method and path searching algorithm.
Shultz-Gibson Method Based DC-link Voltage Suppression of DFIG-based Wind Turbines
MA Xiaoyang, YANG Honggeng, XU Fangwei, ZHAO Haishan
2017, 41(24): 177-183.DOI: 10.7500/AEPS20170112005
[Abstract](1049)[PDF 1.31 M](640)
In view of the DC-link overvoltage of doubly-fed induction generator(DFIG)based wind turbines during the short-circuit fault, a DC-link voltage suppression method based on the Shultz-Gibson method is proposed. The grid-side converter model of DFIG is developed and the mechanism of the DC-link voltage instability is explored by small signal modeling. Based on the developed state-space model of grid-side converter, the Lyapunov function is formed by using the Shultz-Gibson method. Then the nonlinear state feedback controller of grid-side converter based on Lyapunov stability criterion is obtained. Finally, the simulation result shows the proposed method is able to suppress the DC-link voltage oscillation during a grid voltage fault, so as to improve the low voltage ride-through capability of DFIG-based wind turbines.
Key Issues of Fault Analysis on Distribution System with High-density Distributed Generations
PENG Ke, ZHANG Cong, XU Bingyin, CHEN Yu, CHEN Jiajia, ZHAO Xueshen
2017, 41(24): 184-192.DOI: 10.7500/AEPS20170609003
[Abstract](2050)[PDF 1.51 M](1126)
The future distribution system will have the significant characteristics such as high density integration of distributed generations, interconnection of AC/DC hybrid system. Therefore, the fault analysis for distribution system will face new challenges. As the integration of high density distributed generation and power electronic equipments, the fault response presents the property of nonlinear temporal-spatial correlation, and the fault response interaction influences between AC/DC system further increase the difficulty of fault analysis. In this paper, the current research status of the distribution system fault analysis is summarized, and the key issues to be studied in the future are proposed including the analysis and decoupling modeling of distributed generations for the temporal-spatial correlation characteristics, the equivalent modeling of AC/DC hybrid distribution system, and the effective convergence algorithm.

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