Predictive Current Control of Three Level Neutral Point Clamped Based Indirect Matrix Converter

Abstract

This paper investigates a Finite Control Set Model Predictive Control (FCS-MPC) approach on a newly developed topology called Three Level Neutral Point Clamped Based Indirect Matrix Converter. The proposed control strategy takes advantage of the discrete nature of power converter system to predict the future behavior of the output current and subsequently selects the future state that minimizes a cost function before actuating in the next sampling time. Foremost, an extensive mathematical analysis is performed to comprehend the operating principle of Three Level Indirect Matrix Converter (TLIMC). Its ability to generate multilevel output voltage represents a tremendous advantage especially for high voltage applications. The procedure of developing this control scheme is elucidated by considering two discretization methods which are Forward and Backward Euler’s approximation. The outcomes of each discretization are compared in terms of the harmonics content (THD%) and its ability to track the reference output currents through Matlab/Simulink® simulation. Both approaches illustrate good tracking ability while using an intuitive and versatile control scheme.