抽水蓄能机组高-低-高变频起动控制策略研究

Research on Control Strategies of High-Low-High Variable-frequency Startup for Pumped Storage Units

针对抽水蓄能机组使用高-低-高静止变频器的起动问题,建立了抽水蓄能机组起动平均转矩数学模型,分析了升压变压器在负载换流阶段较低频率时的运行特性。以平均转矩数学模型和变压器低频运行特性为基础,设计了抽水蓄能机组变频起动控制策略。通过Matlab/Simulink建立仿真模型,对提出的控制策略进行仿真验证,结果表明该策略可以获得良好的起动性能。

For the startup of pumped storage units using high-low-high static frequency converter,the mathematical model of average startup torque is established,and the operating characteristics of step-up transformer at lower frequency of load commutation mode are analyzed.Based on the mathematical model and transformer operating characteristics,the control strategies of high-low-high variable-frequency startup are designed for pumped storage units.Through modeling on Matlab/Simulink,the simulation results show that the control strategies can achieve good startup performance.