改进电网谐波i_p,i_q检测算法方法的研究

Method of improving i_p,i_q algorithm to detect harmonic in power grid

目前用于检测电网中电流无功分量和谐波分量的主要方法是ip,iq算法。但此算法必须同时提取谐波分量和无功分量,计算量大,精度和延时性的缺陷也使得谐波治理效果一般。在此改进的ip,iq算法为减少计算量,利用分频检测方法略去三相至两相坐标变换还有其逆变换,提高了检测速度,且避免了原算法在三相四线制系统中会有的零序谐波泄漏误差。仿真结果表明:改进的算法具有较好的动态性能和较高的检测精度。

At present, the main method of grid detection for reactive current component and harmonic components is ip,iq al-gorithm. However, this algorithm have to extract the harmonic component and reactive component at the same time, so large cal-culation quantity and insufficiency of accuracy and time delay made the result of harmonic control undesirable. To reduce the amount of computation, this improved ip,iq algorithm improved detection rate and avoid the zero-sequence harmonic leakage error that the original algorithm would produce in three-phase four-wire system by using frequency division detection method to omit the coordinate transformation from three-phase to two-phase, as well as its inverse transform. The simulation results testified the good dynamic performance and detection accuracy of this improved, ip,iq algorithm.