卫星控制系统离散积分滑模容错控制

Discrete-time integral sliding-mode fault-tolerant controller for satellite control system

中文关键词  卫星  滑模  容错控制  不确定性  健康因子

英文关键词  satellite  sliding-mode  fault-tolerant control  uncertainties  efficiency factor

中文摘要

      卫星控制系统是采样控制系统, 对它来讲, 不确定性离散系统容错控制方法非常重要. 本文提出了一种离散积分滑模容错控制方案, 用于调节动量轮有故障的卫星姿态, 其主要部分是设计控制器和控制分配方法. 本文对含有匹配和不匹配的不确定性的离散多输入多输出系统, 设计了一种离散积分滑模控制器, 分析了匹配的和不匹配的不确定性对闭环系统稳定性的影响, 得出了系统状态的界. 应用可达集方法确定控制分配方案时, 本文改变可达集表面的搜索顺序, 提高了求解速度. 以五动量轮卫星模型为例, 将本文方法应用于含多故障、健康因子不准确、匹配不确定性和不匹配不确定性的卫星控制系统中, 理论和仿真的结果一致.

英文摘要

      Satellite control systems are sample-data control systems, to which the method for designing the discretetime fault-tolerant controller with uncertainties is of great significance. A discrete-time integral sliding-mode fault-tolerant control approach is proposed for regulating the attitude of a satellite with reaction wheel faults. The major portion of this approach includes the controller design and the control allocation. A discrete-time integral sliding-mode controller is thus developed for discrete-time MIMO linear time-invariant (LTI) systems，in which the matched and unmatched uncertainties are considered for closed-loop stability, and the final boundaries of system states are determined. In determining the control allocation based on the attainable moment space (AMS), the facets of the AMS is rearranged for reducing the calculation. This approach is applied to the simulation of a five-wheel satellite with multi-faults, inaccurate efficiency factors, matched and unmatched uncertainties. Simulation and analysis results are almost in coincidence with each other.