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首页> 外文期刊>IEEE Transactions on Industrial Electronics >A Switching Control Strategy Based on Switching System Model of Three-Phase VSR Under Unbalanced Grid Conditions
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A Switching Control Strategy Based on Switching System Model of Three-Phase VSR Under Unbalanced Grid Conditions

机译：基于不平衡网格条件下三相VSR交换系统模型的交换控制策略

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摘要

The power electronic converters are typical nonlinear systems. The conventional linearized modeling methods cannot accurately describe the working process of the converter. The control strategies based on the linearized model can only achieve good performance near the working point. By considering the switching nonlinear system nature of the converters, the main contributions of this article are as follows: a current error switching model is developed for the three-phase voltage source rectifiers (VSRs) under unbalanced grid for the first time; and an improved stability analysis theorem is proved for the switching control of the three-phase VSRs under unbalanced grid condition. These contributions are used to design a simple current switching controller for VSRs. The main advantages of the proposed modeling and control strategy are as follows. The switching model of the converter is built without any approximation. It accurately describes the physical working principle of the three-phase VSR under unbalanced grid condition. The proposed current switching controller has a very simple control structure. The switching states of the converter are directly produced according to the switching rule. There are no control parameters, no complicated rotation transformation, and no voltage vector modulation in the proposed switching controller. The proposed switching controller is not sensitive to the circuit parameters. The robustness of the control system is improved without any extra compensators or observers. Simulation and experiment verifies the correctness, the effectiveness, and the superiority of the proposed theory and methodology.
机译：电力电子转换器是典型的非线性系统。传统的线性化建模方法不能准确地描述转换器的工作过程。基于线性化模型的控制策略只能在工作点附近实现良好的性能。通过考虑转换器的切换非线性系统性质，本文的主要贡献如下：第一次为三相电压源整流器（VSRS）开发了当前的误差切换模型;并证明了改进的稳定性分析定理，用于在不平衡网格条件下的三相VSR的切换控制。这些贡献用于为VSRS设计一个简单的电流交换控制器。建议建模和控制策略的主要优点如下。转换器的开关模型内置而没有任何近似。它准确地描述了三相VSR在不平衡网格条件下的物理工作原理。所提出的电流开关控制器具有非常简单的控制结构。转换器的切换状态直接根据切换规则生产。没有控制参数，没有复杂的旋转变换，并且在所提出的开关控制器中没有电压矢量调制。所提出的切换控制器对电路参数不敏感。没有任何额外的补偿器或观察者，控制系统的稳健性得到改善。仿真和实验验证了提出的理论和方法的正确性，有效性和优越性。

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