基于瞬时无功功率理论的谐波检测算法研究

Research for Harmonics Detecting Based on the Theory of Instantaneous Reactive Power

有源电力滤波器中谐波电流检测电路是决定补偿性能好坏的关键。分析了基于瞬时无功功率理论的三相电路谐波电流检测的两种算法,并根据算法原理在不同电压条件下进行了对比研究。理论分析和实验结果表明,ip-iq算法适用于电网电压不对称情况,而p-q算法在电网电压不对称情况下检测结果有明显误差。

Harmonic current detecting circuit is an important part of active power filter that determines its compensating characters. In this paper, two harmonic current detecting methods based on the theory of instantaneous reactive power of three-phase circuits are analyzed and compared with different voltage condition.The result of theoretical analysis and experiment make it clear that, when source voltages are unbalance, ip-iq calculating mode can precisely detect harmonic currents, but there is apparent errors at the p-q calculating mode.