Abstract
The current situation of energy shortage crisis and environmental pollution is aggravating, Renewable energy development and utilization and various green energy to achieve sustainable development has become a necessary measure. Solar energy is the cleanest, most realistic and most promising renewable energy in the world. Solar photovoltaic grid-connected generation is the main development trend of solar photovoltaic utilization. However, as the capacity of pv grid-connected system becomes larger and larger, This will have a profound impact on the power system, and a series of technical problems will change the operation of the system. This paper discusses the principle of relay protection based on traditional distribution network and the influence of photovoltaic on relay protection of distribution network. Then, the positioning method of photovoltaic power grid is expounded. The protection scheme adopted in this paper is to allow isolated island operation, which needs to consider the impact of photovoltaic power generation system on relay protection and put forward relevant protection measures.
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