Digital Implementation of Discontinuous PWMs: Mitigating Parasitic Active Vectors for Improved Load Current Quality in Inverter Systems

IF 6.5 1区工程技术 Q1 ENGINEERING, ELECTRICAL & ELECTRONIC

IEEE Transactions on Power Electronics Pub Date : 2025-01-22 DOI:10.1109/TPEL.2025.3532744

Filip Baum;Ondrej Lipcak;Jakub Kucera;Jan Bauer

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引用次数: 0

Abstract

Discontinuous PWM (DPWM) strategies are widely used in voltage-source inverters (VSIs) due to reduced switching losses and improved harmonic performance at higher modulation indexes. However, DPWMs with discontinuous zero-sequence signals (ZSS) can cause current spikes at clamping instants, which depend on the modulation index and load parameters. In the literature, this behavior is often attributed to the rapid changes in ZSS. This article demonstrates that the current spikes are primarily caused by improper modulator implementation on digital signal processors (DSPs), which introduces an unintended active vector instead of a zero vector at the end of a positive bus clamp for a given phase. The issue arises because PWM modules operate as set-reset units based on a timer and compare values, unlike analog comparators, which react instantaneously. We propose a simple solution using an auxiliary compare register, which is effective for most DSPs. The solution's effectiveness is demonstrated on a VSI-fed 12-kW induction machine controlled by a C2000 Texas Instruments DSP.

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不连续pwm的数字化实现：减少寄生有源矢量以改善逆变器系统的负载电流质量

不连续PWM （DPWM）策略在电压源逆变器（vsi）中得到了广泛的应用，因为它可以在更高的调制指标下降低开关损耗并改善谐波性能。然而，具有不连续零序列信号（ZSS）的DPWMs可能在箝位时刻引起电流峰值，这取决于调制指数和负载参数。在文献中，这种行为通常归因于ZSS的快速变化。本文表明，电流尖峰主要是由数字信号处理器（dsp）上的调制器实现不当引起的，该调制器在给定相位的正总线钳位末端引入了一个意外的活动矢量，而不是零矢量。这个问题的出现是因为PWM模块作为基于定时器和比较值的设置复位单元运行，不像模拟比较器，它是即时反应的。我们提出了一个简单的解决方案，使用辅助比较寄存器，这是有效的大多数dsp。在一台由德州仪器C2000 DSP控制的vsi馈电12kw感应电机上验证了该方案的有效性。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

IEEE Transactions on Power Electronics 工程技术-工程：电子与电气

CiteScore

15.20

自引率

20.90%

发文量

1099

审稿时长

3 months

期刊介绍： The IEEE Transactions on Power Electronics journal covers all issues of widespread or generic interest to engineers who work in the field of power electronics. The Journal editors will enforce standards and a review policy equivalent to the IEEE Transactions, and only papers of high technical quality will be accepted. Papers which treat new and novel device, circuit or system issues which are of generic interest to power electronics engineers are published. Papers which are not within the scope of this Journal will be forwarded to the appropriate IEEE Journal or Transactions editors. Examples of papers which would be more appropriately published in other Journals or Transactions include: 1) Papers describing semiconductor or electron device physics. These papers would be more appropriate for the IEEE Transactions on Electron Devices. 2) Papers describing applications in specific areas: e.g., industry, instrumentation, utility power systems, aerospace, industrial electronics, etc. These papers would be more appropriate for the Transactions of the Society which is concerned with these applications. 3) Papers describing magnetic materials and magnetic device physics. These papers would be more appropriate for the IEEE Transactions on Magnetics. 4) Papers on machine theory. These papers would be more appropriate for the IEEE Transactions on Power Systems. While original papers of significant technical content will comprise the major portion of the Journal, tutorial papers and papers of historical value are also reviewed for publication.