| With the rapid development of economy in China,the resulting energy and environmental problems begin to gradually appear.The large capacity centralized grid-connection and long distance transmission of the renewable energy is the main connection type of the renewable energy in China for the distribution of the load and renewable sources.Thus,the disadvantages of this mode are becoming more and more obvious in recent years,especially the consumption problem.Consequently,the distribution generator gains much more attention in recent years.However,the grid with distribution generator will result in the distribution network from the one-source network to the multi-source network.And the direction of the load flow will change.Thus,this paper studied the relay protection of the Eerduosi grid with distribution generators.The influence of the distribution generator on the distribution network is studied.The improved relay protection scheme is proposed.The main contents of this paper are listed below.First this paper introduces the types of distributed power supply,access capacity,and access,summarizes the characteristics of the distributed power supply,for different types of equivalent model of distributed power supply,access is analyzed;Secondly,the influence of the distribution generator on the relay protection of the distribution network is studied.The simulation model is built.The impact of the distribution network on the short circuit current and load flow of the distribution network is calculated.The results are analyzed in detail.Finally,the improved relay protection scheme of the Eerduosi grid with distribution generators is proposed.The improved three-stage current protection scheme of the distribution network with distribution generators is proposed based.Comparison of the effect of the improved scheme and the traditional scheme is performed.The result demonstrate the rightness and the rational of the proposed scheme. |
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