(1. Department of Electrical Engineering, Tsinghua University, Beijing 100084, China; 2. China Electric Power Research Institute, Beijing 100192, China)

With the rapid development of renewable power, the number of converters is greatly increased. To improve the simulation efficiency, this paper proposes a novel state-space averaged pulse-width modulation(PWM)converter model. In the model, the averaged variables of switching functions are calculated based on amplitude distribution functions. Meanwhile, the Dommel equivalents of the proposed model are derived for the nodal analysis method. Besides, a predictor-correction iterative algorithm is dedicatedly designed to solve the parameters to be determined in this model. Based on the predictor-correction iterative algorithm, the proposed model can further extend the averaging period to boost simulating speed. With an AC system containing multiple photovoltaic stations as an example, by comparing the detailed model, the dynamic averaged model, and the averaged model based on the amplitude distribution model, the accuracy and rapidity of the proposed model is verified. This work is supported by State Grid Corporation of China(No. NYB17201300057).