In this article, two aspects of a synchronous optimal pulsewidth modulation (SOPWM) strategy for inverter control are considered. First, a fundamental current estimation method is proposed, which eliminates the undesired harmonics in the measured currents and allows us to integrate the SOPWM strategy into a field-oriented control scheme without the need of an observer. The main features of this method are its implementation simplicity and its independence of the load parameters. Second, a smooth transition between asynchronous space vector modulation (SVM) and SOPWM is introduced to avoid performance degradation and overcurrent in the current control loops. The proposed transition strategy transforms the asynchronous SVM into a frequency- and phase-synchronous SVM before the transition to SOPWM takes place. Experimental results for a two-level inverter-fed three-phase inductive load confirm the accurate steady-state and transient performance of the proposed estimation and transition strategies.

中文翻译：

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简单的基波电流估计和同步最优 PWM 和异步 SVM 之间的平滑过渡

在本文中，考虑了用于逆变器控制的同步最优脉宽调制 (SOPWM) 策略的两个方面。首先，提出了一种基本电流估计方法，它消除了测量电流中不需要的谐波，并允许我们将 SOPWM 策略集成到磁场定向控制方案中，而无需观察器。这种方法的主要特点是它的实现简单和负载参数的独立性。其次，引入了异步空间矢量调制 (SVM) 和 SOPWM 之间的平滑过渡，以避免电流控制环路中的性能下降和过流。提议的转换策略在转换到 SOPWM 之前将异步 SVM 转换为频率和相位同步 SVM。