| When the Photovoltaic power generation system is accessed to distribution networks, the distribution system is changed from the single resource radiation network distribution into middle and small distributed active network, and the voltage distribution of the distribution networks would be changed. The photovoltaic power generation systems for voltage calculation in distribution networks is studied in this paper, the power flow calculation in photovoltaic power system is adopted, and the distribution law of voltage distribution and its influencing factors are obtained. The major completed work is as follows:Firstly, the photovoltaic power generation system model of reflecting the weather's change was established based on the curve fitting method. Then this paper built the photovoltaic power generation system simulation platform, and made simulation and analysis of the model, proving the feasibility of thephotovoltaic power generation system model. Secondly, combining the characteristics of photovoltaic power generation, an improved forward and backward substitution algorithm is proposed, the modified algorithm adds active and reactive power links, and solves the problem of traditional forward and backward substitution method can not be calculated PV nodes. A 20 nodes chain distribution system and the IEEE34 distribution system have been used in this paper, and verified the feasibility of the improved algorithm.Finally, the law of distribution network voltage distribution is analysis according to the output of photovoltaic power, the type of nodes and the location position of the photovoltaic power. The results show that grid-connected solar PV type node of the photovoltaic power effects voltage supporting much more than PQ types of photovoltaic power generation, and also pointed out the range of accessing capacity of photovoltaic power and the its appropriate accessing position. |
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