扇合矢量法在谐波与无功电流检测中的应用

Application of Fan-in Vector Method in Detection of Harmonics and Reactive Current

指出有源电力滤波器的设计中所采用的p-q法、ip-iq法与d-q法,都是基于转子坐标系的方法;而扇合矢量法是基于定子坐标系的方法。该文证明基于定、转子坐标系的各种方法的内在关系,并给出所述各种方法的统一表达式。在比较各种方法的优缺点、适用范围的基础上,提出一种改进的扇合矢量法,消除因数据带宽问题引起的附加滞后。既解决用扇合矢量法从三相不对称、含畸变的系统中提取基波正序有功、无功电流的实时性问题,又达到简化系统结构和减少计算量的目的。仿真结果表明所提出方法的正确性和有效性。

It is pointed out in this paper that the p-q, ip-iq and d-q techniques used in active power filter （APF） design are the methods based on rotor coordinate and the fan-in vector theory is the method based on stator coordinate. The inherent relationship of the methods between stator and rotor coordinate is proved and the uniform expression is proposed. By comparing the superiority and applicability of algorithms with each other, an improved method of fan-in vector is presented to solve the problem of adding delay because of data band. The method solves the real time problem of how to extract the positive sequence active and reactive currents from an unsymmetrical and distorted three phase system by fan-in theory, and simplifies the system structure and reduces the computation burden. Simulation results show its validity and feasibility.