An Overview of Modelling Techniques and Control Strategies for Modular Multilevel Matrix Converters

Abstract

The Modular Multilevel Matrix Converter is a relatively new power converter topology appropriate for high-power Alternating Current (AC) to AC purposes. Several publications in the literature have highlighted the converter capabilities such as modularity, control flexibility, the possibility to include redundancy, and power quality. Nevertheless, the topology and control of this converter are relatively complex to design and implement, considering that the converter has a large number of cells and floating capacitors. Therefore multilayer nested control systems are required to maintain the capacitor voltage of each cell regulated within an acceptable range. There are no other review papers where the modelling, control systems and applications of the Modular Multilevel Matrix Converter are discussed. Hence, this paper aims to facilitate further research by presenting the technology related to the Modular Multilevel Matrix Converter, focusing on a comprehensive revision of the modelling and control strategies.

Circulating Current Control for the Modular Multilevel Matrix Converter Based on Model Predictive Control

“…The Modular Multilevel Matrix Converter (M3C) is an important power electronic topology that belongs to the Modular Multilevel Converter (MMCs) family [1], [2], [3], [4], [5]. The M3C topology is composed of several full-bridge power cells (shown at the right-side of Fig.…”

“…In the LFM, the addition of common mode voltage is usually required as well as the utilisation of mitigation currents. A similar separation of control algorithms is utilised for the M3C, where the control system is usually divided into the Different Frequency Mode (DFM) and Equal Frequency Mode (EFM) (see [5], [15], [17]). Again in the EFM, common mode voltages and mitigation currents are required.…”

“…Nevertheless, is should emphasised that in a drive applications, e.g. when the M3C drives a high power induction machine, the DFM represents most of the machine operating range (see [5], [15], [13]).…”

Modeling Control and Robustness Assessment of Multilevel Flying-Capacitor Converters

“…When dealing with the modeling and control of multilevel converters, the choice of the employed modeling approach represents the first step. In [15], the modeling of the Modular Multilevel Matrix Converter (M 3 C) is addressed in a matrix form defining voltage-current model and a power-capacitor voltage model, whereas, in [16], the modeling of a Modular Multilevel Converter is performed using a state-space model, which is next discretized using a forward Euler approximation. In this paper, we address the dynamic modeling of multilevel flying-capacitor converters using the Power-Oriented Graphs (POG) modeling technique [17], extending the modeling approach that was proposed in [12].…”

Enhanced Efficient EMT-Type Model of the MMCs Based on Arm Equivalence

“…In order to research the dynamic behaviors of MMCs, significant research efforts have been devoted to develop MMC models for different application purposes on electromagnetic transient (EMT) simulation programs [8,9]. Most EMT simulation programs use Dommel's algorithm [8].…”