1 College of Electrical and Information Engineering, Hunan University of Technology, Zhuzhou 412007, China
2 Changsha NM Drive Technology Co., Ltd., Changsha 410205, China
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文章历史+
Received
Published
Revised
2025-06-04
2026-03-18
2025-12-25
Online Date
2026-06-26
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摘要
在三相两电平逆变器中,虚拟空间矢量调制(virtual space vector modulation, VSVM)因其能降低共模电压的幅值和三次谐波而受到广泛关注,但还存在共模电压的谐波成分丰富,且幅值变化和方向变化的发生率较高的问题,为此提出一种改进型VSVM方法。该方法通过分析经典VSVM的矢量合成和共模电压特点,对虚拟矢量和虚拟零矢量所对应的基本矢量进行优化排序,使每个开关周期的共模电压波形相同,均为单个矩形波。进一步分析了所提方法的共模谐波、死区补偿和开关损耗。在逆变器-永磁同步电机系统中进行仿真和实验。结果表明:与经典VSVM相比,所提方法在保持共模电压低幅值的同时,使幅值变化和方向变化的发生率都降低3倍,完全消除基带谐波和边带谐波分量,并使共模电压的高频段峰值平均减小 6 dB,且线电流、线电压、转矩和转速等性能依然良好。该方法在不增加系统体积和成本的情况下,能更有效抑制共模干扰,有利于共模滤波器的设计,并为其他共模抑制脉冲宽度调制(pulse width modulation, PWM)方法的研究提供了借鉴。
Abstract
In three-phase two-level inverters, the virtual space vector modulation (VSVM) has attracted widespread attention due to its ability to reduce the amplitude of common-mode voltage and third harmonics. However, there are still problems such as rich harmonic components of common-mode voltage, and high rate of occurrence of amplitude and direction changes. To address these issues, an improved VSVM method was proposed. By analyzing the vector synthesis and common-mode voltage characteristics of the classic VSVM, the basic vectors corresponding to the virtual vector and the virtual zero vector were optimally sorted, so that the common-mode voltage waveform of each switching cycle was the same, which were all single rectangular waves. The common-mode harmonic, dead-time compensation, and switching losses of the proposed method were further analyzed. Simulations and experiments were conducted in an inverter-permanent magnet synchronous motor system. The results show that, compared with the classic VSVM, the proposed method reduces the rate of occurrence of amplitude and direction changes by three times while maintaining the low amplitude of the common-mode voltage. It completely eliminates the baseband harmonics and sideband harmonic components and reduces the peak value of the high-frequency segment of the common-mode voltage by an average of 6 dB. Meanwhile, the performance of line current, torque, and speed remains excellent. This method can more effectively suppress common-mode interference without increasing the system volume and cost, which is beneficial for the design of common-mode filters and provides a reference for the research of other common-mode suppression pulse width modulation (PWM) methods.
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Science Technology and Engineering, 2026, 26(8): 3338-3348 DOI:10.12404/j.issn.1671-1815.2504118
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