A New Method of High Frequency Link Matrix Inverter in Parallel

摘要

Parallel inverter technology is the basis for distributed power generation system to achieve high reliability, high redundancy, high capacity and high scalability, at the same time, it is also the key to the stable operation of distributed generation system. Traditional inverter technology requires low frequency transformer to achieve electrical isolation and voltage matching, which results in the disadvantages of large volume and weight, low efficiency, dynamic response characteristics and big audio noise. In order to solve this problem, the parallel connection of three-phase high frequency link matrix inverter is studied in this paper. By using the high frequency transformer, the volume of the parallel system is reduced, the noise of the system is reduced, and the efficiency of the parallel system is improved. According to the filtering problem of traditional power inverter, this paper proposes an improved power filtering method. The second order generalized integrator(SOGI) is applied in this paper, after the coordinate transformation, the sampling voltage and current are filtered by the integrator, and the output power is calculated. As a result, the quality of the power is improved, and the stability of the system is improved.