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单相电压型全桥逆变器的反步滑模控制策略

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Keywords: 单相电压型全桥逆变器,非线性控制,反步滑模控制,参数不确定,外界干扰

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Abstract:

为克服单相电压型全桥逆变器系统中不确定性和外界干扰对控制性能的影响,提出了一种新型单相电压型全桥逆变器非线性控制策略。以输出滤波电容电压及其导数为状态变量,建立了逆变器连续数学模型,并进一步得到具有严参数反馈形式的系统非精确数学模型;在此基础上,将反步法和滑模控制相结合,提出了单相电压型全桥逆变器的反步滑模控制策略,可实现系统全局意义下的渐近稳定,有效地克服了反步法对系统模型的依赖性。实验结果表明,当存在不确定参数和外界扰动时,采用所提出的控制方法,系统输出无静差、输出电压谐波含量很少,对直流电压源扰动和负载扰动具有很强的鲁棒性,且同时适用于线性和非线性负载。

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