基于前馈控制的BLDCM滑模变结构调速系统

A Sliding Mode Controller for BLDCM Based on Feedforward Control

滑模控制能够有效地提高系统的鲁棒性,但为减小滑模控制系统抖振,引入等效控制理论,在滑模控制器输出端串入一个积分器,导致系统的响应速度较慢。为了提高滑模控制器的快速性,本文将滑模控制与前馈控制相结合,构成前馈滑模控制器,不仅补偿了控制器输出端积分环节的影响、提高了系统的快速性和抗扰能力,而且保留了传统滑模控制简单、鲁棒性好等特点。Matlab仿真表明,新型滑模控制器控制下的无刷直流电机调速系统超调量小、鲁棒性好、速度响应较快。文中还利用DSP来搭建实验平台,验证了控制器的有效性。

Conventional sliding mode controller can improve system robustness. A integrator is employed to reduce system ripple in the sliding mode controller, however the system dynamic response is decreased. A new sliding mode controller composed of conventional sliding mode control and feedforward control is used in this paper. The system velocity response is increased and its disturbance can be suppressed since the integral effect of the integrator is nearly counteracted. And the new controller is as simple as the conventional one. It can be seen from simulation that the overshoot of the new sliding mode controller is much less than the PI controller. Comparing with conventional sliding mode controller, the new controller has quick velocity response and good robustness. A digital experimental test-bed is built based on TMS320LF2407 DSP. And the validity of the new controller is verified by experiment.