直流闭锁故障对2015年云广交直流混联输电系统影响的研究

摘要

Power shifting caused by DC block fault will be an important problem in 2015 China southern power grid, which may influence the power grid safely and stability operation. The types of HVDC faults and the causes of DC block fault are introduced, and analyzed the effects of system dynamic characteristic caused by DC block fault.The simulation performed the two kinds of DC block faults which possibly occur to the DC channel. The dynamic characteristic on the DC lines and the Yunnan AC lines was explored, and then contrastive analyzed the effects of 2015 Yunnan-Guangdong AC/DC hybrid power system under the DC block fault. The method that tripped generator on the Rectification side is proposed to enhance the transient stability of the power grid, and the most superior generator tripping strategy is provided. Study results are available for reference in the programming and the drafting for the operation of actual AC/DC hybrid power grid.%直流闭锁故障所引起的潮流转移是2015年南方电网安全稳定运行面临的重要问题.介绍了直流故障的类型和闭锁原因,分析了直流闭锁对系统动态特性的影响.对直流通道可能发生的两种直流闭锁故障进行仿真实验,考察故障后直流线路和送端交流线路的动态特性.对比分析两种故障对2015年云广交直流混联系统的影响.采用对整流侧近端发电机组切机的方法,提高系统的暂态稳定性,并给出最优切机方案.研究结果对实际电网的运行有一定的参考价值.