改进型的i_d-i_q谐波检测方法研究与仿真

Improved i_d-i_q Harmonic Detection Method and Simulation

准确、快速、易于实现的谐波检测方法对有源电力滤波器的控制十分重要。在总结现有谐波检测理论的基础上提出了一种谐波检测方法,该方法不受电源电压畸变影响。通过对三相电源电压的预处理分离出电压正序分量,进而利用d-q变换实现了电流基波正序有功分量的准确检测。研究结果表明,该算法在理想电网电压和畸变电网电压条件下,均能获得正确的基波正序有功和无功电流,为在有源电力滤波系统中实现对谐波电流、无功电流和不对称分量的综合补偿提供了合理的参考指令电流。

Accurate, rapid and easy to implement method of harmonic detection for active power tilter control is very important.On the basis of existing harmonic detection theory,a harmonic detection methods is proposed,which from the influence of power supply volatage distortion.Through voltage pretreatment separation, the voltage positive sequence component is separated, and then use d,q transformation current base wave.The results show that in the condition to accurately detec positive sequence active component of of power grid voltage and distortion grid voltage, the algo- rithm can obtain right base wave positive sequence active and reactive current.The reasonable reference instruction current is provided for the active power tilting system to realize the harmonic current, reactive current and asymmetric component integrated compensation.