干扰解耦降维观测器设计的新方法

Novel Design of Disturbance Decoupled Reduced-order Observer

针对系统状态易受外界干扰的情况,设计一种干扰解耦降维观测器。在设计上为了切合实际,考虑测量机构中含有未知输入的情况,提出在不丢失任何信息的情况下将测量机构中的未知输入通过一个简单的代数变换消除,对测量机构中不含有未知输入的观测器进行了降维设计。给出观测器存在的充分必要条件。观测器的存在条件仅依赖于自身,这种设计比较合理。这种观测器由于才用了降维设计所以结构简单、直接、便于应用。仿真试验表明了所提方法的有效性。

A novel disturbance decoupled reduced-order observer （DDRO） design scheme is presented for the reason that the states can be disturbed by environment easily. In order to suit to the fact, the unknown inputs appearing in measurement is considered. Under the condition that no information is loosed the unknown inputs appearing in measurement can be eliminated by a simple algebraic transformation. Then, a reduced-order design scheme is proposed through a transformation when the unknown inputs don＇t appear in measurement. The necessary and sufficient conditions for the existence of the DDRO are presented. The existent condition of the DDRO depends on the system itself. The design procedure proposed is simple and straightforward enough to be applied. An example is given to show its efficiency.