基于电流型变换器风力发电系统PMSG的SVM-DTC控制方法  

SVM-DTC CONTROL METHOD OF PMSG FOR WIND GENERATION SYSTEM WITH CURRENT SOURCE CONVERTER

作　　者：茆美琴[1] 丁勇[1] 刘斌[1] 翁仕庭 徐斌[1] 

机构地区：[1]合肥工业大学教育部光伏系统工程研究中心,合肥230009

出　　处：《太阳能学报》2014年第10期1897-1903,共7页Acta Energiae Solaris Sinica

基　　金：科技部国际合作项目(2007DFA71340)

摘　　要：针对基于电流型变流器的直驱风电系统中的永磁同步发电机(permanent magnetic synchronous generator,PMSG)控制系统,提出一种基于定子磁链定向的空间矢量调制直接转矩控制(space vector modulation direct torque control,SVM-DTC)算法,根据该算法,通过合成的电流空间矢量可完全补偿电机的转矩和磁链与参考值之间的误差,同时能保证功率器件开关频率的恒定。其中定子磁链估计采用自适应补偿的改进积分算法,解决了纯积分存在直流偏移和低通滤波存在幅值与相位误差的缺陷,从而达到高性能的DTC效果。仿真与实验结果表明,基于定子磁链定向的SVM-DTC算法能有效提高系统的动静态性能且易于实现机侧的单位功率因数控制。Aiming at control system of permanent magnet synchronous generator （PMSG） in the direct-drive wind generation system with current source converters （CSC）, a space vector modulation-direct torque control method （SVM-DTC） in view of stator magnet flux-orientation was presented. The errors between actual output torque and flux of generator and reference commands could be fully compensated by the integrated current space vector method, meanwhile, the constant switching frequency of power devices was ensured. A modified integrator with an adaptive compensation was adopted for the stator flux estimation to solve DC drift in a pure integrator and the defect of amplitude and phase errors for low pass filter and achieve a high performance DTC system. The simulation and experiment results showed that the proposed SVM-DTC method with stator flux-orientation can effectively improve the system dynamic-state and steady-state performances, and easily achieve the unit power factor control of the PMSG.

关 键 词：电流型变流器 永磁同步发电机 定子磁链定向 SVM-DTC 单位功率因数控制 

分 类 号：TM614[电气工程—电力系统及自动化]