定速与变速抽水蓄能机组联合运行一、二次调频仿真及特性研究

Simulation and Characteristics of Combined Operation of Fixed and Variable Speed Pumped Storage Units Under Primary and Secondary Frequency Control

变速抽水蓄能机组在电网频率—功率快速调节及主动支撑等方面相较于定速机组具有独特优势,为此开展定速与变速抽水蓄能机组联合运行一、二次调频仿真及特性研究。即首先建立定速与变速机组联合运行一、二次调频数值仿真模型,然后实现一、二次调频协调仿真,最后揭示定速与变速机组联合运行一、二次调频动态特性。结果表明,频率阶跃的幅值越大,定速与变速机组出力和有功功率一次调频90%目标值响应时间、二次调频目标值响应时间越长。机组的调功指令配比越高,其出力和有功功率的二次调频目标值响应时间越短,变速机组出力和有功功率二次调频目标值响应时间对调功指令配比的变化更为敏感。定速与变速机组的调功指令配比相同时,联合运行的二次调频目标值总体响应时间更短。

Compared to the fixed speed pumped storage unit(FSPSU),the variable speed pumped storage unit(VSPSU)has the unique advantages of quick adjustment and active support for the frequency-power of grid.This paper aims to study the simulation and characteristics of the combined operation of FSPSU and VSPSU under primary and secondary frequency control.Firstly,the numerical simulation model for the combined operation of FSPSU and VSPSU under primary and secondary frequency control is established.Then,the coordinated simulation of primary and secondary frequency control is realized.Finally,the dynamic characteristics of the combined operation of FSPSU and VSPSU under primary and secondary frequency control are revealed.The results indicate that the amplitude of step disturbance of frequency becomes greater,the response time of 90%target value of primary frequency control and response time of target value of secondary frequency control for the output and active power of FSPSU and VSPSU become longer.The ratio of power regulation command of pumped storage unit becomes greater,the response time of target value of secondary frequency control for the output and active power becomes shorter.The response time of target value of secondary frequency control for the output and active power of VSPSU is more sensitive to the change of the ratio of power regulation command.Under the same ratios of power regulation command for the FSPSU and VSPSU,the overall response time of target value of secondary frequency control for the combined operation is shorter.