Research On Mixed H₂/H_∞ Speed Governor For Diesel-generator Set

Mixed H₂/H_∞control theory is a kind of powerful tool of analyzing and designinguncertain system,which can solve mainly control problems of control qualityworsening due to the error of object modeling and model perturbation within a certain range.This paper makes researches on the application of mixed H₂/H_∞control theory in ship power station,emphatically works out the special control problems in the diesel-generator set control system of ship power station. The mixed H₂/H_∞control theory is used in designing diesel-generator set control system of ship power station with the method of mixed sensitivity optimization on the base of analyzing and researching into the mathematical model of diesel-generator set in detail in this paper.The control scheme of applying mixed H₂/H_∞control theory to control diesel-generator set of ship power station is proposed in this paper and a satisfied result is obtained.The mathematical model of diesel-generator set in the mechano-electronic transient process is proposed in this paper,the pulsation and delay of diesel torque are analyzed,the relation between diesel torque and diesel rotational speed together with injection pump rack bar displacement is described exactly.The motion law of diesel-generator set is revealed all-sidedly and nonlinear problem of diesel-generator set is settled by piecewise linearization method.The mathematical model of diesel engine speed regulation system of ship power station using mixed H₂/H_∞controller is advanced in this paper and use the mixed H₂/H_∞control theory into the governing system of diesel engines of ship power station.The essence of mixed H₂/H_∞optimization design method is analyzed in this paper.The main problems that appear in every step of system design are studied in depth.The control scheme of applying mixed H₂/H_∞control theory to control diesel-generator set of ship power station synthetically and mathematical model of diesel-generator set synthetic control system using H₂/H_∞control theory in this paper is advanced.The mathematical model of diesel-generator set is first given in connection with mixed H₂/H_∞synthetic controller.Mixed H₂/H_∞synthetic controller which is designed in this paper works out the synthetic control problem as a result of the coupling between speed and voltage under the circumstances of considering the uncertainty of system model fully.The mathematical model of governing system of two parallel connection diesel engines of ship power station using mixed H₂/H_∞controller is advanced in this paper.The mixed H₂/H_∞control theory into the governing system of two parallel connection diesel engines of ship power station is advanced in this paper.The mixed H₂/H_∞controller improve the frequency stability of two parallel connection diesel-generator set of ship power system and the load distribution control can be applied to realizing.The controller which is designed by mixed H₂/H_∞control theory improves the precision of speed regulation system and voltage regulation system together with the ability of restraining the disturbance under the circumstances of considering the uncertainty of diesel-generator set model amply.The synthetic control problem of speed and voltage is settled.The computer simulation result showed that the mixed H₂/H_∞speed governor designed by the linear matrix inequality approach would improve the dynamic precision of system and the ability to restrain the load disturbance in case of considering system model uncertainty,which improve the frequency stability of ship power system.