Modeling of a Quasi-Resonant DC Link Inverter Dedicated to Common-Mode Voltage and Ground Current Reduction

Abstract

In this paper, the modeling methodology of the AC drive system with a Parallel Quasi-Resonant DC Link Inverter (PQRDCLI) is described. A presented modeling approach is an attractive tool used for the effective evaluation of a common-mode (CM) voltage and grounds current reduction methods. Designed models of inverter, induction machine (IM), and cable are simple, thus the methods for parameter extraction are not complicated. Verification of the proposed modeling approach was realized with the use of the the Synopsys (Mountain View, CA, USA) SABER simulator, while simulation results were experimentally verified. Operation principles of the proposed PQRDCLI converter topology are also described. Based on simulation and experimental results, it was confirmed that the proposed PQRDCLI solution represents required performance within the reduction of common-mode voltage and ground current in electric drives. Moreover, comparisons from a simulation complexity point of view have been performed to the existing methods. The evaluation is being shown at the end of the paper. It is confirmed that the presented method is simple, fast, accurate, and robust as well.

A Review of Reduction Methods of Impact of Common-Mode Voltage on Electric Drives

“…It should also be noted that the ground leakage current i PE and shaft-grounding current at PQRDCLI operation are also limited (by about five times in comparison with a hard-switched inverter). As it is reported in [20,44], in comparison with a hard-switched inverter, a reduction in the du/dt gradient during switching processes in PQRDCLI results in a decrease in the generated conducted disturbances, especially in the range of frequencies from 0.6 to 15 MHz. However, the higher PQRDCLI topology complexity, which results in more complicated control algorithms and an increase in costs, is the main disadvantage of soft-switched inverters.…”