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应用于三相并网逆变器的比例双谐振控制器

DOI: 10.13334/j.0258-8013.pcsee.2015.08.024, PP. 2026-2032

Keywords: 并网逆变器,比例双谐振,比例谐振,电流控制

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Abstract:

电流环是并网逆变器控制系统中的核心部分,对其性能改进具有重要意义。提出一种用于三相并网逆变器的电流控制算法,称为比例双谐振(proportionaldual-resonant,PDR)控制器。作为普通比例谐振控制器的一种改进,该控制器也在两相静止坐标系下实现。它的2个谐振项,即正序谐振项和负序谐振项,分别通过以逆时针和顺时针旋转矩阵为系数矩阵的离散二阶状态方程实现。该离散实现方法避免了双线性变换等其它离散化方法带来的实际谐振频率和相移偏离期望值的现象。因而,所提出的PDR控制器具有稳态误差小、总谐波畸变率低以及电网适应性强等优点。对比实验说明了所提算法具有很高的性能。

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