链式网络中区域备用电源自动投入的风险控制及策略优化

Risk Control and Strategy Optimization for Regional Automatic Input Device of Backup Power Supply in Chain Power Network

摘要:

链式供电网络结构大量存在于电力系统中，区域备自投装置凭借在链式网络中电源点故障时能快速恢复供电的优势在现场应用逐渐广泛。文中通过深入分析区域备自投与常规备自投装置在动作逻辑方面的差异，提出区域备自投装置在安装调试、整定计算、运行维护中的风险及相应的控制措施。针对目前区域备自投逻辑控制策略中仅采用母线失压和主供电源线路无电流作为判据的问题，提出新增“本侧开关位置”“联络线对侧有压”两个逻辑判据，有效规避变电站轻负荷且母线PT断线情况下的误动作。最后，结合110 kV草池—十里坝链式网络搭建RTDS仿真系统，对电源点、联络线故障以及断路器偷跳、母线PT断线进行了仿真测试，结果表明，优化后的控制策略能准确定位故障区，快速合上备用电源，减少误动作发生，有效地提高链式网络的供电可靠性。

Abstract:

There are a large number of chain power supply networks existing in power system, where the regional automatic input device of backup power supply is widely used due to its advantage of quickly restoring power when the power supply fails. The principle and operation logic differences of regionalautomatic input device of backup power supply are analyzed, and the major risks and the corresponding control measures are pointed out for installation and commissioning, setting calculation and maintenance. Two extra logic criteria are also introduced, that is, the switch position of this side and the voltage of the other side of tie line, which can effectively avoid the possible malfunction behavior in the case of lightload and busbar PT breaking in substation. Finally, combined with the 110 kV Caochi-Shiliba chain power network, the RTDS simulation system is built. The simulation tests are carried out under different cases such as power supply point, tie line failure, switch trip without fault and busbar PT breaking. The results show that the regional automatic input device of backup power supply can locate the fault point accurately, switch to the backup power supply and restore power quickly, and optimize the busbar voltage loss criterion to avoid the malfunction behavior, which will improve the power supply reliability of chain power network.