有源滤波器同步坐标系下的空间矢量滞环电流控制新方法

A New Space Vector Hysteresis Current Control Scheme Based on Synchronous Reference Frame for APF

提出一种应用于并联有源电力滤波器的同步坐标系下空间矢量滞环电流控制新方法。该方法提出在同步坐标系下将输出电压空间矢量分布图由传统的6区域等分为12个区域,并从负载电流中分离出基波量作为参考值,以网侧电流为控制对象,对直流量进行滞环跟踪控制;采用两个三电平滞环比较器和一个两电平滞环比较器组成的新型两级滞环比较器,确保选择最合适的输出电压矢量。与传统静止坐标系滞环控制相比,本文提出方法可避免输出电压矢量选择冗余且复杂的问题,电流控制精度高、补偿效果好。同时还分析了在输出电流完全可控情况下本文提出方法所需的最低直流侧电压,并据此选择合适的直流电压,得到最优的补偿效果。最后通过全面的仿真和实验,分析和验证本文所提方法的正确性和可行性。

This paper proposes a new space vector-based hysteresis control scheme based on synchronous reference frame for APF which separates the fundamental wave from the load current as a reference value, considering the grid current as direct control object. The direct-current is chased under synchronous reference frame by hysteresis technology. This method reduces the switching frequency flection effectively, compared with the static reference frame. The controller consists of two three-level hysteresis comparators and a two-level hysteresis comparator, which makes sure to select the most suitable output voltage vector, and improve filtering system performance. Meanwhile, the lowest DC voltage is analyzed for the optimum choice of DC voltage. Simulation and experimental results prove the correctness and feasibility of the method.