基于UPFC的风力发电功率控制研究

Research on Wind Power Control Using UPFC

在推导风力机的机械部分数学模型及风力发电机的等效数学模型的基础上,根据同步发电机的等面积定则和电力系统稳定控制器的原理,设计了统一潮流控制器(UPFC)的串联侧控制系统,该系统除常规的统一潮流控制器串联侧控制系统输入量为输电线路有功功率和无功功率外,采用风力发电机的转速增量为输入量,经过隔直和补偿环节,其输出作为统一潮流控制器有功功率控制环节的调节量,经过调制的有功功率一方面作为常规统一潮流控制器的功率控制输入量,一方面作为桨距角控制器的输入量。斜坡风作用的仿真结果表明:基于所设计控制系统的UPFC不仅能很好地平滑风力发电机的输出有功功率和转速,而且能有效维持风力发电机的机端电压。

After deducing the wind turbine mathematical model and the wind generator equivalent mathematical model,this paper designs the series side control system for the unified power flow controller based on the area equivalent criterion and the principle of the power stability systems.The increment of the rotor speed is isolated and compensated and then be connected into the inputs of the general control system of the unified power flow controller for the regulating of the real power,the regulated real power is used to control the pitch angle and the power of the wind farm.The simulations results based on the ramp wind show,the control system proposal in this paper can make the unified power flow controller not only damp the real power variation and the rotor speed of the wind generator but also maintain the voltage of the terminal of the wind generator.