双馈式抽水蓄能机组功率调节仿真与控制

Simulated power control for doubly-fed pumped storage units

为了研究双馈式抽水蓄能机组在电网功率调节中的作用,该文建立了抽水蓄能电站水-机-电耦合的水力过渡过程计算模型,并基于定子电压定向矢量控制策略,建立了双馈感应电机(DFIM)功率控制系统,对300 MW双馈式可变速抽水蓄能机组并无穷大电网运行时功率调节过程进行了研究,与采用电励磁同步电机的常规定速机组进行了比较。仿真结果表明:可变速机组双馈感应电机可以通过调节励磁电流直接对定子有功功率进行调节,定子有功功率可以快速跟随功率指令的变化;而定速机组电机输出功率为水泵水轮机的机械功率,依靠导叶开度对流量进行调节来实现功率控制,由于引水、尾水管道较长,流量变化需要较长时间,导致定速机组输出功率调节所需时间较长。

The control system for doubly-fed pumped storage units used to regulate the grid power was modeled using a hydraulic-mechanical-electric coupled system of the pumped storage power plant for transient process.The power control system modeled a doubly-fed induction machine(DFIM)using the stator voltage oriented vector control strategy.The model was used to study the power regulation of a 300 MW doubly-fed variable speed unit connected to an infinite bus with comparisons to a conventional fixed-speed unit with an electrically excited synchronous machine.The results show that the DFIM stator active power can be controlled directly by the rotor current so that the stator active power of the variable speed unit can accurately track the power reference.The fixed-speed unit output power is the mechanical power generated by the pump turbine,which can be changed by modifying the guide vane opening and adjusting the flow.However,the penstocks are quite long,so the flow rate and the power of the fixed-speed unit change slowly.