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光伏并网逆变器有限状态模型预测电流控制

DOI: 10.13334/j.0258-8013.pcsee.2015.S.026, PP. 190-196

Keywords: 光伏并网逆变器,模型预测电流控制,α,β,静止坐标,评估函数,最优电压矢量

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Abstract:

通过坐标变换构建αβ坐标下逆变器输出电流的预测模型,利用评估函数对逆变器输出的不同电压矢量进行评估,预测所有可能的输出电流值。选择使评估函数取得最小值的一组电压矢量,将其对应的开关状态应用于下一采样周期,实现快速跟踪参考电流。该控制策略不需要使用传统的脉冲宽度调制器和电流内环控制,仅需进行一次坐标变换即可计算得到最优开关状态,计算量小,易于实现。仿真与实验结果表明,有限状态模型预测电流控制策略具有良好的动、静态性能和无功补偿功能。

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