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微电网系统中基于双二阶滤波器的主动阻尼方法

, PP. 261-268

Keywords: 双二阶滤波器,主动阻尼,LCL滤波器,微电网

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Abstract:

微电网系统中的电力电子接口变换器通常呈并联结构,且通过LCL滤波器连接到公共母线。LCL滤波器自身具有谐振问题,特别是在并联逆变器系统中,频域分析结果中存在额外的正向谐振尖峰和反向谐振尖峰。本文在分析微电网中带有LCL滤波器的并联逆变器系统谐振特性的基础上,采用基于双二阶滤波器的主动阻尼方法,在不引入额外的传感器和控制闭环的情况下,对并联系统中多对不稳定极点同时进行调整。该方法通过在控制系统中添加两对零极点,改变根轨迹的走向,使得多对不稳定极点均移动到z平面单位圆之内,因此系统稳定性得以保证。基于dSPACE1103搭建的实时仿真模型表明了理论分析结果。

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