Abstract
This paper proposes a space vector modulation (SVM)-based common-mode (CM) currents reduction method of an H8 inverter for permanent magnet synchronous motor (PMSM) drives. There are power quality issues in the PMSM drive systems, such as current distortions and CM electromagnetic interference (EMI) due to the fast-switching operation of the inverter. These issues are related to CM voltage (CMV) and CM current (CMC). Although several studies have been conducted to reduce the CMV and CMC, some CMV variations and CMCs are still generated in the real implementation. Unlike conventional methods, the proposed method selects the voltage vectors with similar CMV levels and arranges them considering the series-connected switch operation of the H8 inverter in a voltage vector modulation sequence. At a low modulation index (MI), the proposed method completely restricts the CMV variations into six times. At high MI, the proposed method synthesizes the reference voltage vector differently, depending on the position of the reference vector, to reduce both current distortions and CMCs. The validity of the proposed method is verified through simulations and experimental results.
Highlights
With advancements in power switching devices, pulse-width modulated inverters are able to operate with high switching frequencies
Comparisons of the simulation results of three-phase current, common-mode voltage (CMV), and CM current (CMC) between the standard SVPWM, modified RSPWM (MRSPWM), and proposed method are shown in Figure 13 at a rated load current and rotor speed of 500 rpm (MI = 0.4)
The current total harmonic distortions (THDs) of ia increases to 4.81% due to the absence of zero vector, and several CMV variations between +Vdc/6 and −Vdc/6 are generated whenever load current passes through its zero-crossing point
Summary
With advancements in power switching devices, pulse-width modulated inverters are able to operate with high switching frequencies. Operation at a high switching frequency makes the inverter more compact, efficient, and attractive. As the switching frequency increases, common-mode voltage (CMV) issues become significant [1]. In permanent magnet synchronous motor (PMSM) drive systems, CMVs cause common-mode currents (CMCs) flowing through the parasitic capacitors. These CMCs lead to problems in the PMSM drive system, such as the breakdown of winding insulation, electromagnetic interference (EMI) emission, and communication errors [2,3,4]. CMV issues are major concerns, which should be resolved before realizing the high-frequency switching operation of an inverter in real-world applications
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