变结构控制策略在直驱永磁同步风力发电机中的应用  

Application of Variable Structure Control Strategy in Direct-Drive Permanent Magnet Synchronous Wind Turbine Generator

作　　者：刘向向[1] 李新宇[2] 王奔[1] 邓大磊[1] 

机构地区：[1]西南交通大学电气工程学院,四川省成都市610031 [2]廊坊职业技术学院电气工程系,河北省廊坊市065000

出　　处：《电网技术》2013年第2期520-525,共6页Power System Technology

摘　　要：根据直驱永磁同步风力发电机的结构特点,采用双脉宽调制变流器作为其并网主电路。考虑到永磁同步发电机的数学模型在dq坐标系下是一个非线性耦合系统,不利于控制器的设计。提出了采用逆系统方法将原系统进行线性化解耦,构造出其伪线性系统模型,再运用变结构控制理论设计伪线性系统的闭环控制器。建立了基于此控制策略的仿真模型并与PI控制进行比较。仿真结果表明,该控制策略可实现发电机输出有功功率的准确控制、并网有功功率和无功功率独立调节以及变速恒频运行。变结构控制与PI控制相比,动态响应速度快、鲁棒性好。According to the structural feature of direct-drive permanent magnet synchronous wind turbine generator,the dual pulse width modulation converter is used as the main grid-connection circuit for it.Considering the fact that in synchronously rotating d-q coordinate system the mathematical model of permanent magnet synchronous generator（PMSG） is a nonlinear coupling system and is not favorable to the design of the controller,it is proposed that the original system is linearly decoupled by inverse system approach and a pseudo-linear system equation of PMSG is constructed,and then based on variable-structure control a closed-loop controller for the pseudo-linear system is designed.A simulation model based on this control strategy is built and compared with PI controller.Simulation results show that using the proposed control strategy the accurate control of active power output of PMSG,independent regulation of grid-connected active power and reactive power and variable speed constant frequency（VSCF） operation of PMSG can be implemented.Results of comparing variable structure control with PI control show that the former possesses better robustness and its dynamic response is faster.

关 键 词：风力发电 直驱永磁同步发电机 逆系统方法 变结构控制 比例-积分控制 功率控制 

分 类 号：TM315[电气工程—电机]