基于多阶滞环空间矢量控制的滤波器不平衡控制

Unbalanced Control of Filter Based on Multilevel Hysteresis Space Vector Control

滤波器突发故障时,及时、稳定的控制可提高逆变器并网运行能力。文章研究了在αβ坐标系上,基于多阶滞环空间矢量(以下简称多阶滞环)电流调节器的三相并网逆变器的控制策略。当滤波器突然发生故障时,电流调节器充分利用多阶滞环控制的快速性,直接对正序和负序电流进行控制,避免正负序电流的分解,从而满足滤波器不平衡时并网电流的要求。搭建一台2 kVA并网逆变器实验平台上,在平台上进行实验验证,实验结果证明了该控制方法的有效性和正确性。

The effective control of grid-connected inverter under unbalanced filter condition is able to enhance the ability of grid-connected operation.This paper studies the control scheme of a three-phase grid-connected inverter with multilevel hysteresis current regulators on theαβreference frame.In the case of filter failure,the celerity of the multilevel hysteresis is fully taken advantage of to control both positive and negative current component directly without any decomposition,and grid-connected current requirements are satisfied.The control target is achieved on the experimental platform of a grid-connected inverter,whose capacity is 2 kVA.Experimental results demonstrate the effectiveness and correctness of the method.