配电网30°相角差线路不停电转供的混合顺控方法及试点验证

Hybrid Sequence Control and Pilot Project Verification for None-electricity-cut Load Transferring of Distribution Lines with 30 Degree Phase Angle Difference

在理论和仿真论证了30°相角差线路不停电转供的快速合解环方案基础上,根据断路器操作时间特性、控制器快速检测能力和通信延时等具体关键技术参数,提出了30°相角差线路实现不停电负荷转供的工程实现方法,包括为预防和化解断路器出现拒动的断路器组定义及选择方法,串联、并联、混联的顺序控制流程及关键时间计算方法等。针对自动化系统,提出必须研制新的站侧合解环控制子系统,并提出了相关的信息系统及自动化系统构建方法和功能设计。已成功开发了适合于变电站和开闭所安装的不停电转供自动化装置,并取得了35kV和10kV线路的成功试点投运,对试点试验验证进行了介绍和分析。

On the basis of previous theoretical analysis and simulation results of fast loop closing-opening scheme for load transfer without power interruption of distribution lines with 30 degree phase angle difference, a systematic engineering method is proposed for the quick load transferring according to time characteristics of circuit breakers, quick detection capability of control equipment, time delay of message communication, etc. A circuit break group should be pre-designed for sequential control to prevent and defuse the possibility of refusing operation. Method of serial, parallel and hybrid sequential control are compared. The critical time duration calculation method is proposed. In respect of automation system, it is argued that a new station level loop control unit is necessary, and the construction of corresponding information management and automation system is discussed including their main function design. A substation and switchgear applicable loop control equipment has been successfully developed and applied in both 35 kV and 10 kV lines. The experimental verifications are also presented with analysis.