基于无差拍控制的微电网谐波抑制方法研究

Study on Microgrid Harmonic Suppression Based on Deadbeat Control

针对微电网运行过程中大量非线性负载产生的谐波问题,提出一种基于无差拍控制策略的谐波抑制方法。方法在三相静止坐标系中并联有源电力滤波器(SAPF)模型的基础上,利用ip-iq检测方法获得负载中的谐波电流值,将其与SAPF发出的谐波电流补偿值进行比较,根据比较结果进行无差拍电流跟踪控制来实现谐波补偿功能,达到电网谐波抑制的目的。为验证方法的有效性,对上述控制方法下谐波电流的补偿效果进行仿真分析,结果表明,上述方法能够将电流总谐波畸变率(THD)减小至1.61%,是一种有效的谐波抑制方法。

Aiming at the harmonic problem generated by a large number of nonlinear loads during the operation of microgrid,this paper proposes a harmonic suppression method based on the deadbeat control strategy.Based on the shunt active power filter(SAPF)model in the three-phase stationary coordinate system,the ip-iq detection method was used to obtain the harmonic current value in the loads,which was compared with the harmonic current compensa⁃tion value from SAPF.According to the comparison result,the deadbeat current tracking control was implemented to realize the harmonic compensation,and the purpose of power grid harmonic suppression was achieved.In order to ver⁃ify the effectiveness of the method,the simulation effect of the harmonic current compensation was simulated based on the control method.The results show that the method can reduce the total harmonic distortion(THD)of the harmonic current to 1.61%,which is an effective method.