This article proposes a line-current ripple minimization pulsewidth modulation strategy with reduced zero-sequence circulating current (ZSCC) for two parallel three-phase two-level converters. We split each 60° sector into six subsectors, each applies the nearest three vectors to ensure minimal line-current ripple. To reduce the ZSCC, we further investigate all vector sequences of the nearest three vectors and derive an optimal vector sequence for each of the six subsectors. We unify all carrier sequences under a carrier-based modulation scheme with the assistance of voltage injections. The injected voltage can be computed by a simple algorithm that allows easy implementation in mainstream microcontrollers. The experimental results validate that the proposed method maintains the minimal line-current ripple while significantly reducing the ZSCC compared to the existing line current ripple minimization methods.

中文翻译：

---

用于两个并联交错三相转换器的具有减小的零序循环电流的线电流纹波最小化 PWM 策略

本文针对两个并联的三相两电平转换器提出了一种降低零序循环电流 (ZSCC) 的线电流纹波最小化脉宽调制策略。我们将每个 60° 扇区分成六个子扇区，每个子扇区应用最近的三个向量以确保最小的线电流纹波。为了减少 ZSCC，我们进一步研究了最近的三个向量的所有向量序列，并为六个子扇区中的每一个导出了一个最佳向量序列。我们在电压注入的帮助下，在基于载波的调制方案下统一所有载波序列。注入电压可以通过一个简单的算法来计算，从而可以在主流微控制器中轻松实现。