Reduced Order Observer Design for Nonlinear Systems with Control Applications

This paper presents a reduced-order observer design for nonlinear dynamic systems. The proposed reduced-order observer can be applied to a larger class of nonlinear dynamic systems than the systems with linear observer dynamics. The proposed observer design has also been used for control design of a class of nonlinear dynamic systems with the nonlinearity in the unmeasured system state variables. An example is included to demonstrate that the proposed observer and control design method can be used to stabilize a nonlinear dynamic system with unstable nonlinear zero dynamics.