一种基于瞬时无功功率的改进p-q谐波电流检测方法研究

Research on an improved p-q harmonic current detection method based on instantaneous reactive power theory

针对传统的谐波检测算法在检测三相电压对称时效果良好而不对称时存在很大误差的问题,提出一种新型的既适用于三相电压对称系统又适合三相电压不对称系统的高精度改进p-q谐波检测方法.该谐波检测方法应用正负序解耦理论提取三相电压的基波正序电压分量,通过给定的谐波拟合精度与相对误差等指标进行相应的跟踪计算,从而实现谐波电流的准确检测.通过仿真和实验表明,提出的谐波检测方法与传统方法相比具有较大的优势,精度、有效性和抗干扰性能表现良好.

Aiming at the problem that the traditional harmonic detection algorithm has a good result in detecting the symmetry of three-phase voltage, but has a great error in detecting the asymmetry of three- phase voltage, an accuracy improved p-q harmonic detection method is proposed which is suitable for both three-phase voltage symmetry and asymmetry system. The harmonic detection method uses positive and negative sequence decoupling theory to extract the fundamental positive sequence voltage component of the three-phase voltage, and then carries out the corresponding tracking calculation through given harmonic fitting accuracy and relative error index to achieve the harmonic current detection. The simula- tion and experiment show that the proposed harmonic detection method has more advantages than the tra- ditional method, and the accuracy, effectiveness and anti-jamming performance are good.