适用于变电站母线多分段接线的备自投控制方法

Control method of automatic bus changeover for transformer substations with multi-sectionalized bus wiring

针对传统固定模式备自投在母线多分段复杂接线方式下适应能力差、易导致失负荷等问题,从通用性角度,提出了一种综合利用多间隔信息的备自投控制方法。该方法根据单段母线失电、多段母线失电以及多重备自投等不同情况的特点,通过在线计算各备用电源的负荷裕度、失电母线的负载功率以及备用电源所带母线段数量,自动优选备用电源,可有效防止备用电源过载失负荷,提高备自投后电网供电可靠性。结合工程实例,通过PSCAD仿真验证了所提方法的有效性。

Aiming at the problem that the conventional automatic bus changeover has poor adaptability in transformer substations with multi-sectionalized bus wiring and easily leads to load loss,and other problems,a control method of automatic bus changeover using multi-bay information is proposed from the aspect of universality.According to the characteristics of various fault conditions including single-bus losing power,multiple-bus losing power and multiple automatic bus changeover,by online calculating the load margin of standby power sources,load power of the buses that lose power and the number of buses supplied by standby power source,the proper standby power source is automatically selected,which can effectively avoid power losing caused by overload and improve power supply reliability of the network after automatic bus changeover.The correctness of the proposed method is verified by digital simulation in PSCAD combining with the engineering example.