配电网柔性互联系统多模式运行及其调控策略

Multi-mode operation and its control strategy of flexible interconnected system for distribution network

针对基于柔性多状态开关的配电网柔性互联系统存在的多模式运行与切换、馈线负荷不均衡和主变重载问题,提出了基于虚拟同步机技术的负荷均衡调控策略和主变重载自动调控策略。首先,根据馈线与主变的负载状态,将系统进行运行模式划分;然后,针对系统的不同运行模式深入分析对应模式下的功率传输平衡关系和内在切换逻辑,应用调控策略得到多模式运行下的柔性多状态开关有功功率调控指令,实现了系统多模式稳定运行和自由切换、馈线负荷均衡以及主变重载自动调控,且无需进行控制策略切换。

Flexible interconnected system for distribution network based on SNOP(Soft Normally-Open Point)might have issues including multi-mode operation and switching,unbalanced feeder load and main transformer overload.To address these issues,a load balancing regulation strategy and automatic regulation strategy of main transformer overload based on virtual synchronous machine technology are proposed.Firstly,the operation mode of system is divided according to the load condition of feeder and main transformer.Subsequently,through the analysis on balance relationship of power transmission and switching logic of different operating modes,the active power regulation instructions of SNOP under multi-mode operations are obtained according to respective control strategies.As a result,the multi-mode stable operation and free switching of the system are realized.At the same time,the feeder load balancing and overload automatic regulation of main transformer are realized,in which the control strategy switching is not required.