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动态电压恢复器的谐波补偿数字控制技术

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Keywords: 动态电压恢复器,谐波补偿,数字控制,基波PR控制器,谐波PR控制器

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Abstract:

为了使动态电压恢复器(DVR)可以补偿低次谐波电压,克服数字控制对系统性能的影响,提高其电压补偿效果,提出了一种电压外环基波比例谐振(PR)控制和电感电流内环指定次谐波PR控制的双闭环数字控制策略。重点分析了虚拟LC法和阶跃响应不变法对PR控制器的离散化效果,采用了更为直接的数字设计方法,并对离散域下基波PR控制器和指定次谐波PR控制器进行了详细的参数设计,避免了采样、计算延时等对稳态误差和动态响应特性的影响。在理论分析的基础上开发了11kV·A的DVR样机,并进行了相应的测试,实验结果表明,DVR样机能够满足敏感负载对电压质量的要求,数字控制系统也具有良好的动态响应特性。

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