变速抽水蓄能用双馈发电电动机在维持有功功率输出的同时，可充分利用其功率裕量，成为稳定无功源，灵活参与系统调压调相。为研究双馈发电电动机的无功特性，在分析双馈发电电动机电气量关系的基础上，建立基于转子电流-定子电流的双馈发电电动机V形曲线，可简单直观地反映变速抽水蓄能用双馈发电电动机无功特性。研究了不同工况下双馈发电电动机V形曲线的变化规律。最后，基于RTLAB平台进行硬件在环测试，测试结果表明双馈式变速抽水蓄能机组具备类似同步电机的无功特性，同时也证明了所提分析方法的正确性和有效性。

The doubly-fed generator motor for variable speed pumped storage can maintain the active power output and then make full use of the power margin to become a stable reactive power source, so that it can flexibly participate in system voltage and phase regulation. In order to study the reactive power characteristics of the doubly-fed generator motor, based on the analysis of the relationship among the electrical quantities of doubly-fed generator motor, the V-curve of the doubly-fed generator motor for variable speed pumped storage is established on the basis of the stator current-rotor current, which can simply reflect the reactive power characteristics of the doubly-fed generator motor. Then, the variation law of V-curve of doubly-fed generator motor under different working conditions is studied. Finally, the hardware-in-loop test based on RTLAB platform shows that the doubly-fed variable speed pumped storage unit has the reactive power characteristics similar to synchronous motors, and also proves the correctness and effectiveness of the proposed analysis method.

TM343