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基于LCL滤波器的并网逆变器的控制策略

, PP. 118-124

Keywords: LCL滤波器,并网逆变器,前馈控制

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Abstract:

采用LCL滤波器的并网逆变系统是一个三阶系统,该系统在谐振频率处有较大的幅值增益尖峰,稳定裕度小,使得对并网电流误差调节器的设计复杂化。针对该问题,本文采用网侧(或逆变器侧)电流反馈和一种状态量前馈解耦相结合,提出了一种能使系统从三阶降为一阶的控制策略。采用该方法,控制系统不仅可以获得较大的稳定裕度,而且由于系统阶数降为一阶,谐振频率处的幅值增益尖峰消失了,从而电流误差调节器的设计得以大大简化。此外,为了消除电网电压畸变以及当地负载突变等扰动对逆变器并网电流的影响,本文也给出了相应的控制策略,改善了系统输出电流的质量。仿真结果验证了这种控制方法的正确性和有效性。

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