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单相并网变换器预测直接功率控制策略研究

DOI: 10.13334/j.0258-8013.pcsee.2014.30.002, PP. 5269-5276

Keywords: 单相电压型并网变换器,矢量控制,预测直接功率控制,二阶广义积分,功率解耦

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Abstract:

针对单相并网变换器,通过二阶广义积分构造与电网电压、并网电流正交的虚拟电压、电流分量来形成αβ坐标系下的两相系统。将αβ坐标系下的两相系统变换到按电网电压定向的dq旋转坐标系下。推导两相系统在αβ坐标系和dq旋转坐标系下的数学模型,在此基础上简要分析单相并网变换器的矢量控制原理。根据瞬时功率理论和预测方法推导两相系统在dq旋转坐标系下的功率预测模型,根据此模型提出一种预测直接功率控制策略。搭建1kW的样机,对矢量控制和预测直接功率控制进行研究。实验表明预测控制方案的可行性和正确性,与矢量控制相比,预测直接功率控制具有更快的功率响应。

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