Finite Control Set Model Predictive Control for Asymmetric Cross-Switched Multilevel Inverter Based STATCOM

Abstract

This paper introduces a STATCOM based on the asymmetric cross switch (A-CS) multilevel inverter for the first time. Owing to its asymmetric topology, A-CS generates higher number of voltage levels using the same number of power components and total standing voltage (TSV) compared to symmetric topologies such as the cascaded H-bridge (CHB). Also, it features a high scalability to achieve higher voltage levels. The main goal in the A-CS based STATCOM is to control the voltages of several capacitors in different values in addition to the reactive current control. This paper presents a finite control set model predictive control (FCS-MPC) to achieve this goal. Taking the advantage of three multi-objective cost functions, the control goals are met while the computation burden of the controller is reduced. To confirm the proper operation of A-CS based STATCOM, several simulation results are provided in MATLAB/SIMULINK on a 13-level three-phase 3.3 KV, 400 kVAr A-CS based STATCOM.