The relationship between robust control and LQG control And its application in the medium frequency inverter

摘要

In this paper, a robust controller is proposed to overcome these disadvantages in the application of the LQG control method in the inverter, which has the disadvantage of poor anti-interference ability and robustness. This paper reveals the inner link between LQG control and robust control, and then the load and filter parameter variations acting as uncertain factors, selecting the appropriate weighting functions, a robust controller was designed by mixed sensitivity method. the whole system of simulation and experiments are verificated through the Matlab software and the production of the 10kW prototype respectively, the simulation and experimental results show that the designed robust controller using only a voltage loop can make the system has a good dynamic and static performance and robust performance, steady state voltage stability is between the 114.5V-115.5V, dynamic recovery time is in 10ms.