一种基于小惯量红外稳定平台的复合电流控制方法

Composite Current Control Method for Small Inertia Infrared Stable Platforms

小型化和高动态是红外成像稳定平台技术的发展趋势。由于转动惯量小,传统的PI型电流环控制难以克服反电动势的斜坡干扰,将降低小惯量红外稳定平台的动态响应。同时,高动态的小惯量红外稳定平台技术另一难点是平衡动态性和抗扰性能。为解决上述问题,本文提出一种基于无差拍预测控制和扩张状态观测的复合电流控制方法,有效提高了小转动惯量红外稳定平台的动态响应能力和抗干扰能力。仿真和实验结果表明,该复合电流控制方法将小惯量红外稳定平台电流环的调节时间缩短1/3,对速度响应的动态性能和抗干扰性能都有明显改善作用,而且具有很好的鲁棒性能。

Miniaturization and high dynamics are the development trends of infrared imaging stabilization platform technology.Owing to a small moment of inertia,traditional PI(Proportion Integral)-type current loop control cannot completely overcome the slope interference of the back electromotive force(back-EMF),which will reduce the dynamic response of small inertia infrared stable platforms.Concurrently,balancing dynamics and anti-disturbance performance is another difficulty with regard to high dynamic and small inertia infrared stable platform technology.To solve the a forenoted problems,a composite current control method based on dead-beat predictive control and extended state observation(ESO)is proposed in this paper,which effectively improves the dynamic response and anti-disturbance ability of small inertia infrared stable platforms.Simulation and experimental results show that the composite current control method reduces the settling time of the current loop of a small inertia infrared stable platform by 1/3.It also improves the dynamic performance and anti-disturbance performance of the speed response,and has good performance robustness.