永磁直驱风力发电系统无速度传感器转矩闭环矢量控制

SPEED SENSORLESS TORQUE CLOSED-LOOP VECTOR CONTROL OF PERMANENT MAGNET DIRECT-DRIVE WIND POWER SYSTEM

针对传统基于扩展反电动势(EEMF)模型的永磁同步风力发电机(PMSG)无速度传感器算法实现复杂,且参数依赖性较强的问题,提出一种简化EEMF模型的方法,设计一种简化的全阶滑模观测器(SFOSMO),并据此给出无速度传感器算法的具体实现方式。此外,基于SFOSMO提出简化的定子磁链和电磁转矩观测方法,并分析所提出的定子磁链观测方法的参数灵敏性。最后建立无速度传感器转矩闭环控制系统,并进行仿真和实验研究。结果表明,所提出的无速度传感器转矩闭环控制方法具有良好的动稳态特性,转矩控制精度较高,可用于大功率直驱风力发电系统。

Traditional speed sensorless control method, commonly based on the extended electromotive force （EEMF） model of the permanent magnet synchronous wind power generator （PMSG） , is difficult to make into use and its parameter dependence is strong. So a method to simplify the EEMF model was proposed and a simplified full order sliding mode observer （SFOSMO） was designed in this paper. Then, the practical implementation method of the proposed speed sensorless control strategy was given. In addition, a simplified stator flux and electromagnetic torque observation method was presented based on SFOSMO and the parameter sensitivity was analyzed. Finally, torque closed-loop control system without speed sensor is established. Through simulation and experiments, good dynamic and steady-state characteristics of the speed sensorless torque closed-loop control strategy and high accuracy of the torque control are demonstrated. So the proposed control strategy can be used in high power direct-drive wind power system.