变桨距风力发电机组恒功率反馈线性化控制  

Feedback linearization control of constant output power for variable pitch wind turbine

作　　者：杨俊华[1] 郑俭华[1] 杨梦丽[2] 吴捷[3] 

机构地区：[1]广东工业大学自动化学院,广东广州510006 [2]信阳供电公司,河南信阳464000 [3]华南理工大学电力学院,广东广州510640

出　　处：《控制理论与应用》2012年第10期1365-1370,共6页Control Theory & Applications

基　　金：国家自然科学基金重点资助项目(60534040);广东省教育厅专项重点实验室资助项目(IDSYS200701);广东省科技计划资助项目(2009B010900052);广东省自然科学基金资助项目(S2012040007895);广东省绿色能源技术重点实验室开放基金项目(2012003)

摘　　要：在额定风速以上时,为保证风电机组的安全稳定运行,需要降低风力机捕获风能,使风力机的转速及功率维持在额定值,基于微分几何反馈线性化方法,提出变桨距风力发电机组恒功率控制策略.建立了风力机的仿射非线性模型,采用微分几何反馈线性化变换实现全局精确线性化;根据新的线性化模型,以风力机转速为输出反馈变量,叶片桨距角为输入控制变量,设计桨距角控制器;在风速高于额定值时调节风力机维持在额定转速,从而实现额定风速以上的恒功率控制.仿真结果表明,所提控制策略能较好地解决变桨距风力发电机组额定风速以上的恒功率控制问题,控制方法具有较好的适应性和鲁棒性.When the wind speed exceeds the rated value, the wind power captured by the wind turbine must be reduced to guarantee the wind turbine to operate in the safe and stable status. A control scheme for limiting the power of the variable pitch wind turbine based on the differential geometry feedback linearized theory is proposed to keep the rotational speed and output power at the rated value. An affine nonlinear model of the wind turbine is developed and then globally exactly linearized by a differential geometry transformation. With the new linearized model, we design a novel pitch angle controller in which the output feedback variable is the rotational speed and the input control variable is the blade pitch angle. When the wind speed exceeds the rated value, the pitch angle controller changes the blade pitch angle to reduce the rotational speed back to the rated value for ensuring the constant output power. Simulation results show that, when the wind speed is above the rated value, the proposed control strategy effectively implements the constant output power control for the variable pitch wind turbine with fine flexibility and robustness.

关 键 词：风力发电机组 恒功率控制 反馈线性化 微分几何 全局精确线性化 变桨距 

分 类 号：TM315[电气工程—电机] TP273[自动化与计算机技术—检测技术与自动化装置]