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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. 1. Background In recent years, with the increasingly stringent requirements of environmental protection, more and more clean energy such as wind power, photovoltaic power , biomass power is used in power generation. A large number of distributed generation(DG) power generation by these energy sources are incorporated into the distribution network, has brought great changes to the traditional distribution network. When the distribution network is in trouble, but the DG is still in the power generation and connected to the local load run independently is called the islanding effect (1) . Safe island defense technology refers to the use of the island effect to ensure power supply security of the important load in the range of the DG power supply, so as to protect people's lives and property safety. The key to this technology is the division of the DG power supply range, because it will reduce the reliability of the power supply if the responsible scope is too large and will waste energy if too small. In order to solve this problem, we provide a range partitioning method with single DG and multiple DG in this paper.

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