一种改进型ip-iq坐标变换电流谐波检测方法

针对现有的一些检测方法在三相电压不对称或畸变时存在的一些缺陷,根据通用瞬时无功功率理论,对传统的ip-iq坐标变换的谐波电流检测方法做了简单的改进。该方法从矢量分析角度出发,利用带通滤波器,根据三相电网电压和电流综合信息,获取ip-iq坐标变换矩阵来实现对谐波电流的检测,省去了三角函数计算和锁相环的使用,简化了计算。该方法既可适用于三相对称正弦电源系统,也可适用于不对称非正弦电源系统和电压畸变系统。仿真结果验证了该方法的正确性。

An Improved Detection Method for Currents Harmonics Based on ip-iq Coordinate transformation

In this paper, limitations of some existing detecting methods for harmonics currents in the case of unbalanced or distorted three-phase voltages is discussed, according with the universal instantaneous reactive power theory, an improved detection method for harmonics currents is proposed. Using the vector analyses of the power voltages and currents integrated information and band pass filter to gain ip-iq coordinate transformation matrix, the harmonics currents can be detected easily and rapidly. The method is very simple without the phase-locked-loop and sinusoidal function calculation. The proposed detection method is suitable entirely for the balanced three-phase sinusoidal and unbalanced three-phase sinusoidal power systems and voltage distortion system. The simulation verify the optimal current detection performance.