摘要
为提高风电机组的响应速度,获得最大功率,现有大型风电机组普遍采用变速变桨距控制机构。但由于风速的随机性、风电机组参数的时变性和系统的非线性,造成风电机组输出功率的不稳定。根据传统PID控制系统的局限性和风电机组的特性,提出了三维模糊控制器,但多维模糊控制复杂的规则会严重影响系统的实时性。为了达到多维控制系统的控制品质,控制规则以表达式的形式给出,同时结合三元函数的Lagrange插值法,使系统输出的离散变量转变成连续精确的控制变量以提高控制精度。运用SIMULINK的仿真结果表明,三维模糊控制器显著地提高了系统的控制品质,其鲁棒性也明显优于PID控制系统。
To improve response speed of wind turbines and get maximum energy, an increasing number of larger wind turbines are developed with a variable-speed variable pitch control mechanism. Due to the stochastic nature of wind speed, time-variable characteristics of parameters and system nonlinearities, the power generated by wind turbines changes rapidly. In view of the limitation of the PID control system and characteristics of wind turbines, the three-dimensional fuzzy controller was proposed. In order to achieve good control quality, rules are given in the expression formula as rules of the multi-dimensional fuzzy controller can seriously affect the real-time quality of the system. Lagrange interpolation of the three-dimensional function was introduced to improve control accuracy through transforming the discrete variable into the continuous variable. Simulation results show that the threedimensional fuzzy controller can dramatically improve control quality and is superior in robustness to the PID control system.
出处
《中国电机工程学报》
EI
CSCD
北大核心
2009年第26期112-117,共6页
Proceedings of the CSEE
关键词
风电机组
变桨距
PID
三维模糊控制器
拉格朗日插值法
wind turbine
variable pitch
PID
threedimensional fuzzy controller
Lagrange interpolation
