In order to mitigate the periodic disturbances in voltage-source converter (VSC)-based applications, different techniques have been comprehensively investigated to mitigate these periodic disturbances, either using additional disturbance-mitigation controller or by means of modifying the modulation stage. As well as providing an in-depth analysis of various periodic disturbances in VSC-based applications, this article presents an overview of the controller-based periodic disturbance mitigation techniques. And these techniques, different in concept, can be categorized into two types, i.e., the internal-model-based methods and the feedforward-based methods. The controller prototypes and their variants are comprehensively introduced with motivations and distinct features. The characteristics of different strategies and the corresponding implementation methods are compared and summarized. And the practical issues such as computational burden and frequency adaptability are simultaneously included as well to present a comprehensive illustration. In addition, the characteristics of different strategies are compared and summarized with the aim of providing a clear illustration.

中文翻译：

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用于三相两电平电压源转换器的基于控制器的周期性干扰减轻技术

为了减轻基于电压源转换器 (VSC) 的应用中的周期性干扰，已经全面研究了不同的技术来减轻这些周期性干扰，要么使用额外的干扰缓解控制器，要么通过修改调制级。除了对基于 VSC 的应用中的各种周期性干扰进行深入分析之外，本文还概述了基于控制器的周期性干扰缓解技术。这些技术在概念上不同，可以分为两种类型，即基于内部模型的方法和基于前馈的方法。控制器原型及其变体全面介绍了动机和独特的功能。比较和总结了不同策略的特点和相应的实现方法。并且同时包括计算负担和频率适应性等实际问题，以提供全面的说明。此外，还比较和总结了不同策略的特点，以提供清晰的说明。