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电网技术  2009 

基于滑模控制的PWM整流器建模与仿真

, PP. 18-23

Keywords: PWM整流器,PI控制,滑模变结构,非线性控制,仿真模型

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Abstract:

为克服三相电压型脉宽调制(pulsewidthmodulation,PWM)整流器启动性能差、负载扰动时直流电压波动大的缺点,针对采用常规PI控制的整流器对系统参数变化较为敏感的弊端,提出一种基于滑模变结构的电压环非线性控制方案。采用一种新颖的a-b坐标系下的开关表设计方法,不仅可以取得良好的滑模算法动态响应特性,而且有效降低了开关频率。在Matlab/Simulink环境下建立仿真模型,对滑模控制和PI控制方案进行仿真比较,结果表明,应用滑模变结构控制三相PWM整流器,不仅设计和实现简单,而且具有较好的鲁棒性和动态性能。

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