基于分布式电源主动控制的配电网合环电压波动抑制方法

Loop-closing voltage fluctuation suppression method of distribution network based on active control of distributed generators

配电网合环操作可能导致节点电压波动甚至越限,不仅影响负荷的正常运行,还威胁分布式电源(DG)的安全。为此,提出了一种通过DG主动控制,以抑制配电网合环电压波动的新思想。通过分析合环过程中电压波动的产生机理和影响因素,量化了抑制合环过程电压波动的控制需求,进而构建了抑制合环电压波动的DG可行功率集;通过刻画DG的功率可控范围,提出了基于可行功率集与功率可控范围交集判别的DG最优控制点计算方法,并提出了基于DG主动控制的配电网合环电压波动抑制方法。算例表明,该方法能够最大限度上抑制配电网故障恢复过程的合环电压波动,有效提升故障恢复过程的安全性和可靠性。

The loop-closing operation of the distribution network may lead to node voltage fluctuation or even limit crossing,which may not only affect the normal operation of the load,but also threaten the safety of distributed generator(DG).Aiming at this problem,a new idea for suppressing loop-closing voltage fluctua⁃tion based on DG active control in the distribution network is proposed.By analyzing the generation mechanism and influencing factors of voltage fluctuations in the process of loop closing,the control require⁃ments for suppressing loop-closing voltage fluctuation is quantified,and the feasible power range of DG that suppresses the loop-closing voltage fluctuations is constructed.By portraying the controllable power range of DG,the calculation method of control reference value of DG based on the intersection of feasible power range and controllable power range is proposed.The method of loop-closing voltage fluctuation suppression of distribution network based on active control of DG is proposed.The results of case study show that the proposed method can suppress the loop-closing voltage fluctuation of the fault restoration to the maximum extent,and effectively improve the safety and reliability of the fault restoration.