| :Currently, research and practice on the smart grid have brought new attention by the Government and have gained the concern of the whole society. A large number of DG are accessed in the distributed network is the fundamental characteristic that distinguishes smart grid from the traditional power grid. Distributed generation technology is an ideal way to make full use and development of renewable energy. It has a small investment, clean environment, supply reliability and power advantages of flexible, you can not add the bulk power system to provide effective and efficient support. DG has changed the trend of one-way mode of distribution system and makes the trend can not be predicted, but also produces a range of power quality problems and affected the system's reliability, so that the distributed power issues related to access to distribution network has become an urgent research topic.The voltage variation and regulation of distribution network including distributed generation is analysed and a triangle load distribution model is presented in this paper. First, the article introduces the basic concepts of distributed generation and the classification of distributed power, and specifically describes the photovoltaic technology, wind power technology, fuel cell technology, biomass power generation technology which more popular are these four distributed generation technologies.Second, power flow calculation with DG is analyzed, DG interface model and the node type approach in the flow power calculation is researched. The power flow program is appropriate to distributed network based on the Newton nethod is writed, and the convergence is checked. The above results show that the DG program in the current approach is effective. The effect on the voltage of different types DG is researched. It shows that DG is treated as an asynchronous generator interface model will reduce the voltage level, while the synchronous generator model interface and the power electronic converter interface model of the DG on the system voltage level in a supportive role and DG is accessed to the grid through the inverter has a strong supporting role.Third, in order to analyze the voltage distribution of distribution network with DG, a triangle load distribution model is presented in this paper and the voltage profile is calculated based on the circuit superposition principle. Through example it is shown that the triangle load distribution model with DG is much better than the uniform load distribution model. According to this method voltage changes when DG is penetrated into radial feeders from DG output and interconnecting location is researched.Finally, the voltage regulation criterion in distribution system with DG is analyzed, specific ways of reactive power compensation are identified, when DG is out of operation use a single point of compensation and two points of compensation, the compensation scheme which DG is in operation based on voltage criteria by detailed analysis. So, voltage regulation methods which are appropriat to the DG out of operation and specific operational are offered. Through examples, comparing the advantages and disadvantages of these methods, the effectiveness of the algorithm is verified. It provides a theoretical basis and technical support for voltage regulation. |
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