基于SNOP的配电网合环倒负荷控制策略研究

Research on control strategy of closed loop switching operation in distribution network based on SNOP

针对传统交流配电网合环电流不可控,且某些地区电网存在“停电倒负荷”的情形,提出一种基于SNOP的变电站合环倒闸操作方式及相关控制策略,以解决传统交流电网合环电流不可控的问题。首先,介绍了SNOP的基本原理及在变电站中的接入方式。然后,分析了各种运行方式下的SNOP控制策略,详细说明了基于SNOP的变电站合环倒闸控制方式。在正常运行时,通过对SNOP进行潮流调节控制,以实现经济性运行等功能;在进线因计划或故障停电时,通过对SNOP进行孤岛模式控制,以保证对用户供电的可靠性和连续性;在进线复电时,通过对SNOP进行并网控制,以实现对供电方式的平滑恢复。最后,建立了基于SNOP的电力系统及控制系统仿真模型,并与常规电网合环倒闸操作进行了仿真对比分析,仿真结果验证了所提方案的可行性和有效性。

In view of the loop closing current of traditional AC distribution network is uncontrollable,and there is a situation of power failure switching operation in some areas of power grid.In order to solve the problem of uncontrollable loop closing current in traditional AC power grid,a loop closing switching operation and related control strategy of substation based on SNOP is proposed.Firstly,the basic principle and access mode of SNOP are introduced.Then,this paper analyzes the control strategy of SNOP under various operation modes,and describes the control mode of loop closing switching operation based on SNOP in detail.In normal operation,SNOP is controlled by power flow regulation to achieve economic operation.When the line is cut off due to plan or fault,SNOP is controlled in island mode to ensure the reliability and continuity of power supply to users.When the line is returned to power,through SNOP grid-connected control,in order to achieve the smooth restoration of power supply.Finally,the simulation model of power system and control system based on SNOP is established,and the simulation results are compared with those of conventional power grid.The simulation results verify the feasibility and effectiveness of the proposed scheme.