摘要
双馈感应电机(Doubly Fed Induction Machine, DFIM)具有出色的转速调节性能,应用到抽水蓄能中,可满足电网调频调压的需求,解决由水头变化、出力波动导致的水泵水轮机效率降低的问题。为了减少水泵工况启动时所需的压水环节,本文提出了一种带负载软启动的控制方法,该方法以定子磁链和转子转速为控制目标,可使机组在尾水管充满水的情况下,转速从零平滑上升至并网所需转速。在并网阶段设计了转子d轴电流和转子位置角补偿器,以实现无冲击软并网;在调速阶段根据功率需求、工作水头确定水轮机的最优转速,以实现负荷优化调节。上述算法共同构成了双馈式可变速抽水蓄能机组运行控制策略。同时对所提出的控制策略进行了仿真和试验验证,结果表明该策略能够使机组在带轻负载的情况下完成软启动和软并网,并最终实现满载调速。
Doubly fed induction machine(DFIM) has excellent speed regulation performance, which can meet the demand of frequency and voltage regulation of power grid and solve the problem of reducing the efficiency of pump turbines caused by changes in hydraulic head and output fluctuations. To omit the drainage process of runner chamber before DFIM start-up in pumping mode, a control method of soft-starting with slight load is proposed which ensures that the speed of DFIM increases smoothly from zero to the required for grid-connection. The excitation current compensator and rotor position angle compensator are designed to improve the control accuracy for grid-connection. In the speed regulation stage, the optimal rotational speed of the turbine is determined according to the power demand and the hydraulic head, so as to realize the optimal regulation of the load. With the methods mentioned above, an overall control strategy of doubly fed variable speed pumped storage unit is proposed. The control strategy is simulated in Matlab and implemented on a towing unit platform. Results of simulation and test verified the effectiveness of the proposed strategy, including soft-start with light-load, grid-connecting with no inrush current and speed regulation.
作者
龚国仙
李定林
吕静亮
姜新建
贺儒飞
GONG Guoxian;LI Dinglin;LV Jingliang;JIANG Xinjian;HE Rufei(Department of Electrical Engineering,Tsinghua University,Beijing 100084,China;China Southern Power Grid Company Limited,Guangzhou 510630,China)
出处
《大电机技术》
2022年第3期1-7,20,共8页
Large Electric Machine and Hydraulic Turbine
基金
国家重点研发计划项目(2017YFB0903700)。
关键词
可变速抽水蓄能机组
双馈感应电机
软启动
调速
variable speed pumped storage unit
doubly fed induction machine
soft-starting
speed regulation
