| H2/H? control theory has unique advantages in solving the difficult problems of error of object modeling and uncertain disturbance.The controller designed by H2/H? control theory can ensure the system has certain robustness and obtain better dynamic performance.However,since the H2 performance and H?performance of the system often conflict with each other,the H2/H? control problem usually only has the Pareto optimal solution.The LMI method is the main method for solving the H2/H? control problem in recent years.However,additional conditions need to be added to obtain a feasible solution when solving the matrix inequality system.This method will give the results a certain degree of conservation.At the same time,when applying the LMI method to solve the H2/H? control problem,only one feasible solution can be obtained in one calculation,and the calculation efficiency is low.Therefore,the traditional LMI method is difficult to estimate the Pareto optimal front of the H2/H? control problem.In this paper,the H2/H? control method is applied to the diesel generator set speed control system of the mining electric wheel dump truck,which solves the uncertainty caused by the severe conditions.Focusing on the above,the main work of this article is as follows:?1?This paper establishes a mathematical model of a diesel generator set for mining electric wheel dump trucks.Mathematical methods are used to express the relationship between the output shaft stroke of the diesel engine,the rotational speed and the power angle of the generator.Accurately describe the movement law of the diesel generator set of the mining electric wheel dump truck.The nonlinear relationship between the output torque and the speed of the diesel engine is solved by the piecewise linear method.?2?This paper analyzes the uncertainty disturbance caused by the working environment of mining electric wheel dump truck,and proposes that H2/H? control theory is applied to the diesel generator set speed control system of mining electric wheel dump truck.A mathematical model of the diesel generator set speed control system for mining electric wheel dump trucks using H2/H? control is established.?3?Conservative and low efficiency of solving the H2/H? control problem for the LMI method.An improved multi-objective adaptive differential evolution algorithm is proposed to solve the H2/H? controller,and the external elite archive retention strategy based on congestion entropy is adopted.In this paper,the mathematical model of large-scale mining electric wheel dump truck diesel generator set is used,and the improved multi-objective parameter adaptive differential evolution algorithm and LMI method are used to obtain the H2/H? state feedback controller respectively,and the comparative simulation is carried out.The simulation results show that the improved multi-objective parameter adaptive differential evolution algorithm can obtain better control effect of the state feedback controller.Based on the mathematical model of large-scale mining electric wheel dump truck diesel generator set,the improved multi-objective parameter adaptive differential evolution algorithm and LMI method are used to obtain the H2/H? state feedback controller,and the simulation is carried out.The simulation results show that the improved multi-objective parameter adaptive differential evolution algorithm can obtain better control effect of the state feedback controller. |
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