Optimal control algorithm of safe Island defense model in distribution network with distributed generation

With the development of technology and people's awareness of environmental protection, more and more clean energy for power generation, such as wind power, photovoltaic power generation and so on. This type of energy is renewable and pollution-free, but it is intermittent, reliability and stability is poor. And distributed generation will form isolated island when the fault occurs in the entire power grid can make up for the shortcomings of these intermittent energy. This paper introduces the determination method of the isolated island range with only one DG, and the range of each DG island is calculated by using the continuous shortest path algorithm for multiple DG in power grid. The purpose is to ensure that the load power supply and to achieve the lowest cost at the same time.