基于空间矢量的基波正序、负序分量及谐波分量的实时检测方法

提出了一种新的0实时检测基波正序分量，基波负序分量和谐波分量的方法，该方法首先将三相瞬时值合成一个空间矢量，然后对所得矢量的实部和虚部分别进行滤波以滤去谐波分量。如果忽略滤波后残余的谐波分量，则滤波后的矢量可认为是由对应正序分量的逆时针方向旋转的矢量和对应负序分量的顺时针方向旋转的矢量合成，实时分解这两个矢量的方法为：将分解后的两个矢量根据所用滤波器的特性旋转一个适当的角度，可以完全补偿滤波所引起的相移，从而可以实时准确地分解出基波正序分量和基波负序分量，进而分解出谐波分量，仿真结果证明了所提方法的正确性和有效性。

STUDY AND SIMULATION OF REAL-TIME DETECTING METHOD FOR FUNDAMENTAL POSITIVE SEQUENCE,NEGATIVE SEQUENCE COMPONENTS AND HARMONIC COMPONENTS BASED ON SPACE VECTOR

A new method for detecting the fundamental negative and positive sequence components as well as the harmonic components is developed in this paper. In the method, the three-phase quantity is firstly converted into a space vector, then its real part and imaginary part are filtered by two filters respectively. After filleting the remaining harmonics are neglectable, so the filtered space-vector is mainly composed of two vectors actually. The counter clockwise rotating one corresponds to the fundamental positive sequence component, and the clockwise rotating one corresponds to the fundamental negative sequence component. A method is developed in the paper to real time decompose the two vectors. After decomposing, rotate the two vectors a proper angle according to the phase shift caused by the filters at the fundamental frequency respectively, the phase shift can be compensated. So the fundamental negative and positive sequence components can be detected real time with high precision. In the same time, the harmonics can also be detected by the method. Simulation results have shown the validity of the proposed method.