考虑合环延时的含分布式电源配电网合环电流协同控制方法

Closed loop current cooperative control method for distributed power distribution network with closed loop delay considered

合环操作常用于配电网故障恢复中,但在合环过程中产生的冲击电流可能导致线路电流越限,不仅可能损坏设备,还会危害人身安全。针对合环电流的抑制大多关注于整体优化,未重视合环暂态过程产生的冲击电流问题,本文提出了一种考虑合环延时与分布式电源(DG)控制协同抑制合环冲击电流的方法。通过分析配电网合环冲击电流的产生过程及原理,刻画了DG出力以及合环延时对于合环冲击电流的影响,建立了DG主动控制与合环协同的控制优化模型,从而提出了考虑合环延时影响以及DG出力的配电网合环冲击电流协同控制方法。算例表明,该方法通过DG出力与预期合环时刻的优化,能够最大程度上控制配电网合环过程中的冲击电流,提升了配电系统的安全性。

Distribution network fault recovery depends on the looping operation,but the impulse current generated during the looping process may cause the line current to exceed the limit,which may not only damage the equipment,but also endanger personal safety.Currently,the suppression of closing current is mostly focused on the overall optimization,but not on the impact current generated by the closing transient process.In particular,there is a delay between the issuance of the closing command and the actual closing of the loop in the distribution center,which will directly affect the size of the closing ring impulse current.The existing methods assume that the closing operation is completed immediately,ignoring the delay of the closing ring,and that may further cause the suppression of the closing ring impulse current to fail to achieve the expected goal.For this reason,a method considering the synergistic suppression of the closing loop impulse current by the closing loop delay and DG control is presented.By analyzing the generation process and principle of closed-loop impulse current in distribution network,the influence of DG output and closing delay on closed-loop impulse current is depicted,and a control optimization model of DG active control and closing-loop cooperation is established.A collaborative control method for closed-loop impulse current in distribution network with distributed power supply considering closing delay is presented.The example shows that this method can minimize the closing impulse current during the recovery process of distribution network and improve the safety of distribution system by optimizing DG output and the expected closing time.