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提出了一种基于空间电压矢量的四桥臂有源电力滤波器(APF)电流控制方法。方法将三维电压空间矢量统一划分成四个对等的平行六面体,每个平行六面体空间代表一组相间电流控制对象,通过控制该组电流可简单实现电流解耦控制。通过一组外滞环比较器,快速判定参考电压所在六面体区域;通过一组三角波和内滞环比较器组成的混合控制器控制相应平行六面体区域内相应相间误差电流,实现准定频控制。最后运用PSCAD/EMTDC电力暂态仿真软件验证,结果表明了方法的有效性。
A four-leg active power filter (APF) current control method based on space voltage vector is proposed. Methods The three-dimensional voltage space vector is uniformly divided into four equal parallelepipeds. Each parallelepiped space represents a group of phase-to-phase current control objects. Current decoupling control can be simply realized by controlling the current in the group. A set of external hysteresis loop comparator is used to quickly determine the hexahedron region where the reference voltage is located. By means of a hybrid controller consisting of a triangular wave and an internal hysteresis loop comparator, the corresponding phase error current in the corresponding parallelepiped region is controlled to achieve quasi-constant frequency control. Finally, PSCAD / EMTDC power transient simulation software verification, the results show the effectiveness of the method.