基于综合矢量的功率定义及在无功电流和谐波电流检测中的应用

在三相电路综合矢量的基础上定义了三相电路的有功功率和无功功率，并定义基波电压综合矢量与基波电流综合矢量的点积的直流分量为有功功率，电压综合矢量与基波电流综合矢量的叉积和它们点积的脉动分量构成了无功功率．基于无畸变的电压参考矢量。直接对三相电压、电流的瞬时值运算，可以获得三相瞬时无功及谐波电流．该方法省去了复杂的坐标变换，并具有一定的工程实用价值．仿真结果表明该方法用于动态无功补偿装置可以获得满意的结果．

Definition of Power Based on Resultant Vector and Its Application in Detecting Reactive and Harmonic Current

The active and reactive power is defined based on the resultant vector in 3-phase circuit. The definition of active power is DC component of the dot metrix of fundamental voltage resultant vector and the fundamental current resultant vector, and the reactive power is the vector product of the voltage resultant vector and the fundamental current resultant vector ,as well as the pulsating components of their scalar product. By calculating the instantaneous voltage and current on the reference of the voltage vector, we have obtained the three-phase instantaneous reactive and harmonic current. The algorithm was simplified and the simulation result shows that the method leads to satisfactory detecting performance. The definition of power in this paper can be applied in the detection of reactive and harmonic current.