Fast Simulation Research on Photovoltaic Inverter based on Converter Average Value Model

To improve the power system simulation efficiency of high proportion of power electronic equipment, this paper establishes the simplified converter model based on average operation theory, which is suitable for fast simulation of the large-scale photovoltaic system. On the basis of analyzing the detailed model and control algorithm of the converter, the electrical characteristics between the AC side and the DC side of the converter are coupled according to the principle of power conservation. To reduce the simulation computation, the high frequency components and intermediate process are ignored, and the influence of the control algorithm on the converter characteristics is retained. The average value model of photovoltaic inverter is deduced respectively. At last, Taylor method is adopted to discretize the continuous mean value model and obtain the iterative form of the model. The results of PSCAD/EMTDC experiment show that the proposed converter average value model can effectively improve the electromagnetic transient simulation speed of the large-scale photovoltaic system on the premise of guaranteeing the simulation accuracy.