Multiobjective Power Losses Optimization of MMC Based on Multipopulation Genetic Algorithm for HVdc Transmission System

Abstract

The modular multilevel converter (MMC), with its strengths of efficient and easy to expand, has become one of the core components in high-voltage direct current (HVdc) transmission. The gross power losses of the submodule (SM) and the semiconductor devices with the highest losses in the SM significantly influence the operational cost and service life of MMCs. The losses optimization method based on circulating current control has become an important power losses optimization technique due to its advantage of low system hardware costs and low output current harmonics. To achieve co-optimization of MMC operational cost and service life, this article introduces a multiobjective power losses optimization control based on multipopulation genetic algorithm (MOPLOC-MPGA). Simulation and experimental verification are carried out to prove the applicability of the raised MOPLOC-MPGA in MMCs.