Fast Energy Equivalent Modeling of MMC Based on Controlled Source

Abstract

The electromagnetic transient simulation of large-scale MMC has the problems of large memory requirements and long simulation time, which restricts the development of simulation research [1-3]. To solve the problem of low efficiency of MMC electromagnetic transient simulation, this paper proposes a fast energy equivalent model for the equivalent of MMC. Thus, the fast simulation of MMC under normal working conditions and efficiency of simulation model can be realized. First of all, the rationality of achieving the Norton equivalent of MMC bridge arms is derived from the node voltage analysis method. Then the equivalent modeling method of MMC controlled source can be obtained. On this basis, a fast energy equivalent model that can simulate the capacitance characteristics of each sub-module of MMC is proposed by analyzing the switching function form of MMC. Finally, the proposed simulation modeling method was verified on the PSCAD/EMTDC simulation platform.