Harmonic Modeling of a Diode-Clamped Multilevel Voltage Source Converter for Predicting Uncharacteristic Harmonics

Abstract

In response to the growing demand for medium-and high-power trends, multilevel voltage source converters (VSCs) have been attracting growing considerations. One of the widely used VSCs are the diode-clamped multilevel VSC (DCM-VSC). As these converters proliferate, their harmonic impact may become significant. Nevertheless, a harmonic model for the DCM-VSC is currently lacking in the literature. In this paper, the ABCD matrix, mapping the input harmonics to the output harmonics of DCM-VSC, is derived. As the matrix is formulated in the time-domain, the output harmonics are exact and do not suffer from harmonic truncation errors. As the paper will demonstrate, the derived ABCD matrix can be easily applied to a microgrid system and users can easily predict all the uncharacteristic harmonics when a microgrid is subjected to various conditions of imbalance. In addition to all the results being validated with those of PSCAD/EMTDC, the computation time of the proposed method is in contrast much shorter.

Application Research of Chaotic Carrier Frequency Modulation Technology in Two‐Stage Matrix Converter

“…Apart from the advantages of matrix converter, TSMC also possesses some outstanding features, for instance, zero current commutation of rectifier, simple clamping circuit, and less switches at particular condition. Therefore, TSMC has become one of the most promising areas in many fields [1][2][3][4][5][6].…”