Research On Reliability Evaluation And Fault Isolation Devices Allocation Of DC Supply And Distribution System

With the development of electronic technology,plenty of power electronic devices were installed in DC supply and distribution system.Therefore,the system topology and device fault mode are different with AC system.So,a reliability evaluation method considering the above difference is in need.In addition,the DC supply and distribution system has a wide application prospect,but the goals of the configuration of power electronic devices are diverse in different problem.So,the allocation of fault isolation devices of two types of typical DC supply and distribution systems are studied in this paper.Based on minimum-cut set,a DC load area division method is proposed,and then a DC supply and distribution system reliability evaluation model is established,considering the effects of function failure,small current grounding and distributed generate.In the aspect of DC/DC module allocation,two typical DC/DC module configurations are proposed and compared,based on module's function.Finally,the effects of configurations and failure rates of DC/DC module on DC system reliability are evaluated and analyzed.In the aspect of DC circuit breaker allocation,as the DC circuit breaker will be cheaper,a DC circuit breaker optimization dynamic programming considering the changing price of the breaker is proposed,in which the sum of switch investment,operating cost and outage cost is designed as optimization objective.Taking a loop distribution network for example,the effect of distributed generate on DC circuit breaker allocation is studied.