基于SVPWM的鼠笼异步风力发电机直接转矩控制研究与实验

Control Strategy Study and Experiment Implementation of Direct Torque Control of Squirrel Cage Induction Wind Power Generator Based on SVPWM

相比于永磁同步风力发电机,鼠笼异步发电机具有结构简单牢固、体积小、维护及运行成本低、无永磁体退磁的隐患等特点,在数千千瓦功率等级的风力发电运用中,使用鼠笼异步发电机是一个值得考虑的方案。本文针对全变速鼠笼异步风力发电系统,提出一种基于SVPWM的鼠笼异步风力发电机直接转矩控制策略,相比于传统转子磁场定向控制不需要电流内环控制,直接对发电机的电磁转矩和定子磁链直接控制,加快了转矩和磁链控制的响应速度。最后,通过实验验证了所提控制策略的正确性与有效性。

Compared with permanent magnet synchronous wind power generator,squirrel cage induction generator has the advantages of simple structure,small size,low maintenance and operation cost,and no permanent magnet demagnetization,therefore the application of squirrel cage induction generator in the wind power generation of thousands of kilowatt power levels is a worthy consideration. In this paper,a novel direct torque control strategy based on SVPWM for squirrel cage asynchronous wind power generator is proposed. The proposed control method does not require the current inner loop control,which directly controls the electromagnetic torque and stator flux of the generator directly compared to traditional rotor field oriented control. Finally,the correctness and effectiveness of the proposed control strategy are verified by experiments.