| With the development of Internet of Things technology and the improvement of users’ requirements for distribution network automation,cyber technology is increasingly applied in the power industry,forming a high integration of cyber system and power physical network.Power physical network is gradually integrated into the characteristics of cyber system.That is,distribution network CPS came into being.Because of its safety and stability,distribution network CPS technology is in the ascendant.However,the reliability of distribution network CPS needs to be re-examined because the traditional distribution network has joined the control role of cyber system.At the same time,due to the vigorous development of renewable energy,the access of distributed power generation to the distribution network will cause the fluctuation of the distribution network and bring unstable factors to the CPS of the distribution network.The second chapter of this paper discusses the factors affecting the reliability of distribution network CPS,and studies the main factors affecting the reliability of distribution network CPS.Traditional distribution network reliability evaluation considering the influence of the distribution network structure itself,the cyber system for power distribution lines CPS influence on power physical network,in this paper,the Monte Carlo method was applied to distribution network reliability evaluation simulation verification.In the third chapter,the reliability evaluation of distribution network CPS without considering the influence of cyber system is firstly carried out,and on this basis,the bus cyber communication system is added,and the reliability evaluation of distribution network CPS considering the influence of cyber system is compared with that without considering the influence of cyber system.Then,by changing the structure of the cyber system,the CPS reliability of distribution network under star,ring and bus structures is discussed.Finally,increase host,controllers,switches and MTTF communication lines,as the main line of cyber system evaluation,the reliability of the power distribution lines CPS from different structure,different cyber system components MTTF multiple angle to calculate the reliability index of the CPS distribution network,the simulation results show that,when the communication system uses the star structure,the reliability of the power distribution lines CPS increased significantly;and some of the host,exchange and communication lines of communication components such as failure rate is not obvious effect on the reliability of the power distribution lines CPS,by contrast,the host and controller failure rate changes will cause CPS large variation of the reliability of distribution network,and the controller influence is most obvious,therefore,in the design of communication system,to focus on the failure rate of the controller.After the distributed power grid,due to the uncertainty of wind power output,thus the operation of the power distribution network scheduling to all want to change,and the grid will have volatility,in consideration of wind power output probability model,on the basis of the RBTS F4 fan,add two sets of power distribution system of distribution network considering the influences of cyber system is only the CPS reliability evaluation indicators,and the cyber system is completely reliable,and only the CPS reliability evaluation index of the distribution network which is influenced by the access of Distributed generation(DG)is considered for calculation.Fan access capacity at the same time,considering different will also affect the CPS the distribution network reliability,therefore,the calculation of different fan access capacity of CPS distribution network reliability index,the simulation results show that,within limits,increase the fan capacity can obviously improve the reliability of distribution network CPS,but when the fan capacity increasing,to improve the reliability of the system is tend to be more saturated. |
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