基于线性模型跟随的风力发电功率解耦控制

Power-decoupling control for wind energy conversion system based on linear model following control

中文关键词  风力发电系统  无刷双馈电机  自抗扰控制  线性模型跟随控制

英文关键词  wind energy conversion system  brushless doubly-fed machine  auto-disturbance rejection controller  linear model following control

中文摘要

      本文首先对包括风力机、无刷双馈发电机的风力发电系统进行建模, 并通过同步坐标变换分解为两个解耦子系统. 在此基础上, 采用双环控制使系统跟随参考模型的特性. 由功率特性曲线可知, 某一风速对应特定的最大功率. 针对无刷双馈发电机的复杂结构, 在控制系统的内环采用自抗扰控制, 可以很好的实现功率解耦控制; 外环采用线性模型跟随控制, 使得发电机能够很好的跟随模型特性. 仿真结果表明, 双环控制器可以使系统的输出功率快速的跟踪给定的功率, 实现完全模型跟踪, 证明了控制算法的有效性.

英文摘要

      A wind energy conversion system(WECS) model is presented, including wind turbine and brushless doublyfed machine working as a generator. The WECS is decoupled into two subsystems by synchronous frame transformation. Furthermore, a double-loop controller is applied to make the system follow the characteristics of the reference model. It’s well known that a particular wind speed corresponds to an maximum powerr output. By considering the complex structure of the BDFM(brushless doubly-fed machine), a disturbance rejection controller(ADRC) is used in the inner loop of the control system in order to achieve power-decoupling control. Besides, linear model following control(LMFC) is used in the outer loop to make the generator effectively track the characteristics of the model. Simulation results indicate that doubleloop controller enables the output power of the system to track the given power and achieves perfect model following, which verifies the validity of the control algorithm.