参与一次调频的双馈式可变速抽水蓄能机组运行控制  

Operation control of doubly fed adjustable speed pumped storage unit for primary frequency modulation

作　　者：龚国仙 吕静亮 姜新建[1] 孙旭东[1] GONG Guoxian;LV Jingliang;JIANG Xinjian;SUN Xudong(Department of Electrical Engineering,Tsinghua University,Beijing 100084,China)

机构地区：[1]清华大学电机工程与应用电子技术系,北京100084

出　　处：《储能科学与技术》2020年第6期1878-1884,共7页Energy Storage Science and Technology

基　　金：国家重点研发计划项目(2017YFB0903700)。

摘　　要：针对以转速为控制目标的双馈式可变速抽水蓄能机组参与电网一次调频问题,提出一种双馈式可变速抽水蓄能机组与水泵水轮机协联控制的一次调频控制策略。建立水泵水轮机与双馈感应电机的数学模型,分析双馈感应电机根据水泵水轮机效率特性曲线进行转速寻优的过程。分别在双馈感应电机的转速控制和水泵水轮机的导叶开度控制中加入频率控制器,将电网频率的偏差整定为转速和导叶开度的附加指令,并分析了频率控制器参数对双馈式可变速抽水蓄能机组调频效果的影响。仿真结果表明,在频率变化初期,通过双馈式可变速抽水蓄能机组调节转速,短时吸收或释放能量,可减小频率波动的幅值;在频率变化后期,通过水泵水轮机调节导叶开度改变机械力矩,调整输出功率,可减小频率的稳态偏差。To solve the problem that the doubly fed adjustable speed pumped storage unit with speed as control target cannot participate in the primary frequency modulation of power grid,this paper proposed a kind of coordinated control of doubly fed adjustable speed pumped storage unit and pump turbine for primary frequency modulation.The mathematical models of pump turbine and doubly fed induction machine are established,and the process of speed optimization of doubly fed induction machine is analyzed according to the efficiency characteristic curve of pump turbine.By adding frequency controller to the speed control of doubly fed induction machine and guide vane opening control of pump turbine separately,the grid frequency deviation is tuned as additional command for speed control and guide vane opening control.Moreover,the influence of frequency controller parameters on the frequency modulation performance of doubly fed adjustable speed pumped storage unit are analyzed.The simulation results show that the doubly fed adjustable speed pumped storage unit can absorb or release energy in short term by adjusting the speed to reduce the amplitude of frequency fluctuation at the beginning of frequency fluctuation.And the mechanical torque of pump turbine is changed by controling the opening of guide vane,and then the output power is adjusted to reduce the steady-state deviation of gird frequency in later period.

关 键 词：双馈式可变速抽水蓄能机组 转速寻优 一次调频 协联控制 

分 类 号：TM343[电气工程—电机]