变速抽水蓄能机组的快速调频能力与动态特性分析

Analysis on Fast Frequency Regulation Capability and Dynamic Characteristics of Variable-speed Pumped Storage Units

摘要:

与定速抽水蓄能机组相比，变速抽水蓄能机组可以通过调节机组转速实现灵活功率调节，并在不同工况下运行时均具备调频能力。为充分对比分析定速与变速抽水蓄能机组的快速调频能力与动态特性，首先，建立了包含调频功能模块的全阶双馈变速抽水蓄能装置模型；其次，分析了变速抽水蓄能机组在不同工况下的控制与运行特性；最后，通过基于三机九线系统的动态仿真实验对比分析了定速与变速抽水蓄能机组的调频能力与动态特性。仿真结果表明，通过有功功率下垂控制，抽水蓄能机组可以在发电和抽水工况下为系统提供快速频率调节，且变速抽水蓄能的调频能力优于定速抽水蓄能性能。

Abstract:

Compared with fixed-speed pumped storage units, variable-speed pumped storage units can achieve flexible power adjustment by regulating the speed of units and have frequency regulation capability under different operating conditions. To fully compare and analyze the fast frequency regulation capability and dynamic characteristics of fixed-speed and variable-speed pumped storage units, firstly, a model of full-order doubly-fed variable-speed pumped storage model including frequency regulation function module is established. Secondly, the control and operation characteristics of variable-speed pumped storage units under different operating conditions are analyzed. Finally, through the dynamic simulation experiment based on three-machine nine-wire system, the frequency regulation capability and dynamic characteristics of fixed-speed and variable-speed pumped storage units are compared and analyzed. The simulation results show that the pumped storage unit can provide fast frequency regulation for the system under power generation and pumping conditions through active droop control, and the frequency regulation capability of variable-speed pumped storage units is better than that of fixed-speed pumped storage units.