配电网过电压有源抑制的注入电流控制方法

摘要

To suppress the three-phase unbalanced overvoltage caused by unbalanced three-phase parameters in distri?bution network,an unbalanced overvoltage suppression method is proposed.By injecting a current of specific amplitude and phase to the neutral point of distribution network through an active inverter,the zero-sequence voltage is controlled to realize the suppression of three-phase unbalanced overvoltage.Afterwards,a proportional resonant(PR)closed-loop control method is designed:by setting appropriate proportional and integral coefficients in sequence,the controllability of injecting current is improved,thus achieving astatic control.Simulation and experimental results verified that the pro?posed control method had high precision and low steady-state error,which can suppress the three-phase unbalanced overvoltage quickly and accurately.%为了对配电网三相参数不平衡导致的三相不平衡过电压进行抑制,提出一种基于比例谐振控制的配电网三相不平衡过电压有源抑制方法.通过有源逆变器向配电网中性点注入特定幅值与相位的电流,调控零序电压,从而实现三相不平衡过电压的抑制.然后设计了比例谐振闭环控制方法,先确定控制器的比例系数再确定积分系数,提高了注入电流的可控性,实现了无静差调控.仿真及实验结果表明,该方法控制精度高、稳态误差低,能达到快速、精确地抑制三相不平衡过电压的目的.