Design and Research on Co-simulation Training System of Large-Scale Power Grid with Distribution Network Based on Intelligent Materials System

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1 Design and Research on Co-simulation Training System of Large-Scale Power Grid with Distribution Network Based on Intelligent Materials System BaiShan Mei 1, XiPing Zhang 2, Jie Xu 2, and YueHong Xing 3 1 Room 614 Electric Power and Automation Engineering, Changyang Road 2588 Shanghai, China 2 Room 708, Graduate Apartment, Changyang Road 2588 Shanghai, China 3 Room 1308, Graduate Apartment, Changyang Road 2588 Shanghai, China {meibs67,zhangxiping1xt,xujiexiwen}@163.com, xingyuehong@126.com Abstract. The power system training simulation software, exist in the market, emphasis on the network structure and flow calculation without the local details or equipment operation, or focus on one or two substations, but ignoring the power of the substation. With more and more complex structure of the domestic power grid, and increasing scale of power, the existing power system simulation software cannot meet the requirements. A large-scale power co-simulation system is presented, which including 10kv distribution network. Therefore, cosimulation covers all voltage levels, including the central station, substations, power distribution station and distribution network. It comply with international standards, interactive, distributed simulation platform, which can enable the management system to keep with intelligent, automated, network function. Keywords: Large-scale Power Grid, Interactive, Co-simulation, Distribution network, Intelligent. 1 Introduction Power system simulation software, professional skill training method, is widely adopted in modern grid enterprises, it play an important role in the enterprise s actual operation. From the current network simulation training system view, based on its size and complexity, mainly divided into three types: the isolated substation simulation training system, the simulation training system of the simplified grid, the simulation training system of the practical grid. However, based on the document [2-4], the voltage, whatever kind of grade, are concentrated in above of 35KV. These simulation system is not only the regional, isolation system, but without distribution network, so it is difficult to adapt to the rapid development of simulation environment of large-scale power grid with distribution network. Although the distribution network structure is complex, connection mode changes a lot, but it is a central part of power grid structure. Obviously,it is very important for grid enterprises to complete the distribution network simulation system. Although document [5] has introduced the S. Lin and X. Huang (Eds.): CSEE 2011, Part IV, CCIS 217, pp , Springer-Verlag Berlin Heidelberg 2011

2 94 B. Mei et al. distribution simulation system, it doesn t contain global concept because of the lack of combining with power grid. At present the scale of domestic power grid is expanding constantly, structure is more complicated, we must consider the power network scheduling, fault treatment and daily operation from the entire network angle. So we need new grid simulation training system, named the power grid simulation training system, to adapte modern grid system. This system should include Ultra high voltage(uhv), high voltage, and low voltage distribution network, which can carry out not only single type of work training for switching operation personnel, but also entire network training for dispatcher. This paper will take the original station of the simulation platform as the foundation, join the distribution network, combine Ultra high voltage(uhv), high voltage, eventually will form a unified co-simulation of large-scale power grid. 2 The Design Ideas of Power Grid Simulation The simulation system adopts integration design, which combined primary equipment with second equipment for transmission network and distribution network, in other words, the substation, power distribution equipment, power grid and dispatching automation will be integrated logically, which can accurately show the real power grid, like the reactive between substation equipment. So we can comprehensive, consistently, realize the co-simulation training. As is shown in figure 1, the simulation system construct unified power grid model, including 500KV, 220KV, 110KV, 35KV, 10KV, 400V. What we should note is that there will be different grid simulation system in different areas, take Shanghai for example, this region has more 35kv lines than 110KV lines. So we should consider this situation in the simulation system, in order to adapt the different areas. Fig. 1. The structure of simulation about Large-scale Power Grid The co-simulation of large-scale power grid is formed from the expending of original simulation system. To keep the system consistency, reduce interface system and make full use of the advantage of original grid simulation system in precision algorithm, the analysis of the distribution network will be improved and enhanced from original system simulation. Considering the topological structure of closed-loop structure, open loop running in distribution network, and the high ratio of R/X in distribution circuit, the new simulation system will be improved in the dynamic flow analysis of original system and dynamic model of kinds of equipment, so as to suit the characteristics of distribution network. This can guarantee astringency, reflect the

3 Design and Research on Co-simulation Training System 95 distribution of grid flow and dynamic process about kinds of operation, abnormal and fault cases. Meanwhile, the system satisfy requirement of real-time, especially in the situation various operation or malfunction. 3 The Option of Distribution Network For a regional network, UHV and high-voltage line are not complex, so we can put the whole circuit structure in this simulation system. However distribution network is different, it is not realistic to simulate the whole circuit structure because of huge data of large variety and quantity. So we must choose several typical station, which can be simulated for detailed simulation, some other station only need an electrical main wiring diagram in the system. According to the substation classification from "Technical principle of Shanghai grid ", and combined with the actual situation, we divide the distribution substation into three groups: K(switch)station, P(ring network) station, W(outdoor)station. Based on a main wiring way, relay protection type, whether there is a transformer, we can choose nearly 10 different substation. For example, KTA (with transformer, switch, using air insulated switchgear in 10kV station) station, KFG (no transformer, switch, using SF6 inflatable ark in 10kV station) station, PT2 (ring substation, 2 transformer) station, PF (ring station, no transformer) station, WH (outdoor station, 10kV device)station, WX (outdoor and preinstalled station)station, WL (low voltage cable branch box outside)station, these distribution substation will be simulated in detailed. Meanwhile, other distribution station, existed in the realistic grid, will be displayed with simplified form in the simulation system, which can make the network reinforced and complete. 4 Structure and Function of Simulation System 4.1 The Software and Hardware Structure of Simulation System There is no need additional hardware device in this system, because distribution network simulation will ultimately be integrated to original simulation training system. In addition, the system can also run separately, the hardware configuration is the same as original simulation training system. Hardware system is composed by the server, faculty platform (1-2 microcomputer), trainees platform (1-2 microcomputer for each student), the virtual stage for substation, big screen system for scheduling and monitoring, communication system, network equipment, printer, power systems, and various environmental simulation equipment. Hardware system configuration will follow the principle of openness, in order to achieve extensibility and maintainability, it also provides a reliable and flexible operation environment for training simulation system. Hardware equipment must comply with the international standard, has the advanced world level, and widely used in electric power industry, to ensure the operation reliability of the simulation training system and perfect after-sale service. Fig.2 shows the whole hardware platform of large-scale power grid. Software configuration includes system software and application software.

4 96 B. Mei et al. System software: operating system Windows xp; database system 8i Oracle workgroup (Windows version); development tool Visual Studio 6.0 Enterprise. Applications software: interactive, distributed simulation software support platform; power grid simulation software; power grid SCADA system simulation, set control station monitoring system simulation and integrated automation system simulation system; substation simulation software; faculty and students system software; operation ticket and working ticket system; The simulation training system research software. Fig. 2. The hardware structure of simulation about Large-scale Power Grid 4.2 The Simulation System Function After integration, the system adopt uniform platform, it can carry much content,including the original station of the simulation, such as power supply and load parts, electric network and center station simulation, distribution station and circuit simulation, dispatching automation system simulation, etc. Power source and load is an important part in the whole power system. This system will fully simulate all important power supply in Shanghai, and realize the simulation about main wiring in power plants substation and generator running characteristics. For net load, the system will be simulated with the form of equivalent load. Power grid simulation is mainly used for simulation on dispatcher training simulation, referred to as DTS. DTS software have very strong simulation function, including three parts and 20 modules, such as power system model, the control center model and faculty platform system. Dispatching automation simulation system can realize grid flow simulation, operation simulation, fault simulation, protection simulation, safety automatic device simulation, and other functions.

5 Design and Research on Co-simulation Training System 97 Center station, set control station monitoring system simulation and integrated substation automation backend simulation system, can realize simulation of many different types grid SCADA system, human-machine interface of the set control station monitoring system and integrated substation automation backend system, so as to ensure the whole training system has the variety of adaptability. It simulates the variety of different types of monitoring system provides students a virtual function of the monitor system. Distribution station and the distribution circuit device simulation is the main simulation in this system, it is also the key to patrol and operate for distribution operation personnel. The equipment inside and outside the distribution station which voltage rating is from 10KV to 380V, is established 3D virtual scene system. The system can comprehensively reflect static and dynamic process of equipment, it can enable training students to learn various patrol, operation, inspection, analysis, etc. it also can realize flow simulation, operation simulation, fault simulation, protection simulation, safety automatic device simulation, and other functions. The system operation is simple, which can realize the different personnel training function in one software platform. Here to take switching operation for example, briefly explain the simulation system operating methods, training students can find three parts on computer, including main electrical grid diagram, substation operation panel plate, 3D equipment inside station, the same as realistic. Switching operation only need to be carry out in substation operation panel plate. Here are steps on separating breaker: As is shown in figure 3, (1) control mode from remote control to on-site; (2) using key to open the switch operation lock; (3) separating circuit breaker (" preparation separating"---" separating "---" after separating "). After the operation, changes of three-dimensional diagram is shown in figure 4. Fig. 3. The diagram of switching operatio (substation screen plate) Fig. 4. Three-dimensional of the station equipment 5 Conclusion Co-simulation of large-scale power grid with distribution network can give full play to the role of the simulation training, shorten the learning period of dispatchers and operators, broaden the training field and scope, improve operational control ability and the level of accident management for dispatchers, strengthen global idea for staff.

6 98 B. Mei et al. This paper mainly discusses the design idea of the co-simulation system, including some detail problem, especially for choice of the typical station in large distribution network. Besides, the system can automatically produce operation ticket, connect with different software configuration management platform in different manufacturers. What s more, the system can realize the whole process of management for training. With the development technology of computer, as well as the increasing demand of grid enterprises, power system simulation software is also improvement constantly, large-scale power grid comprehensive simulation system, based on 3D virtual technology, is under study. Acknowledgements. The authors acknowledge Supported by Leading Academic Discipline Project of Shanghai Municipal Education Commission, Project Number: J51301,and very helpful comments from Wang li-fang, director at Technology and Development Center of Shanghai Municipal Electric Power Company. The analysis, views, and any remaining errors in this paper are the sole responsibility of the authors. References 1. Cao, Q., He, Z., Yu, L.: Research on evaluation scheme for computer simulation system. Computer Engineering and Applications 47(2), (2011) 2. Wang, B., Lin, C., Pu, T., et al.: Design and implementation of a training simulator for substation control centre. Power System Technology 28(15), (2004) 3. Yang, Y.s., Hao, X.: Application of high level architecture/run time infrastructure (HLA/RTI) to substation simulation. Power System Technology 24(9), (2000) 4. Gao, X., Shao, K., Zhao, R.: Application of united simulation training system based on DTS and OTS. East China Electric Power 34(6), (2006) 5. Liang, W., Qiao, H., Gong, Q.: Design of an expandable simulation system for virtual distribution network. Power System Technology 34(8), (2010) 6. Zhang, X.: Construction experience on remote monitoring system about substation. Automation of Electric Power Systems 29(16), (2005) 7. Zhang, B., Cheng, S.: Analysis on higher power network. Tsinghua university press, Beijing (1996) 8. Wu, X., Yang, H., Wang, X.: The simulation technology on computer. Chemical industry press, Beijing (2008)