随着智能电网的发展，抽水蓄能电站也进入了建设投产的快速增长期。背靠背启动是多数抽水蓄能机组水泵方向启动的备用启动方式。首先简要分析了背靠背启动的原理，针对国内某400MW机组，介绍了背靠背启动的监控流程。然后，通过现场试验的方式，分析试验结果，给出了拖动机导叶开启规律和拖动机与被拖动机励磁电流选择的建议。最后，分析了现场试验过程中，几次背靠背启动失败案例的原因，给出了现场解决的方法。

With the development of smart grid，plenty of the pumped storage units are constructing． The back-to-back start-up is used as the standby way in pumping mode． In this paper，the principle of the back-to-back start-up is briefly analyzed． The monitor process of back-toback startup is introduced for a domestic 400 MW pumped storage unit． The guide vane opening principle and the field currents in both machines are chosen and proposed on the basis of experimental results． The reasons and solutions of two failure start-up cases are also presented．