Simulation system design of mixed H2/H∞ control and its application in a load control system of thermal power unit

A mixed H-2/H-infinity approach provides a framework to integrate optimal performance and robustness into a single controller. It has both favorable frequency performance and time domain performance. However, it is a very hard to design and solve the mixed H-2/H-infinity controller. In this paper, we formulate the mixed H-2/H-infinity problem into three independent parts: summarize the state space description of generalized plant, design the output feedback control law and solve mixed H-2/H-infinity optimal controller. Thus, the mixed H-2/H-infinity problem is simplified greatly. Based on these parts, simulation platform of mixed H-2/H-infinity control (SPMC) is developed by Matlab/simulink. Further, We design the mixed H-2/H-infinity controller of load control system of thermal power units by SPMC. Simulation results show that the control system has good performance.