Study On Some Problems In Optimization Algorithm For Digital Control System

Digital Control System is the combination of computer and control technology, which is widely applied in various areas, such as electrical, electronics, control systems, and some other fields related for its characteristics of high stability, high precision and quick operation speed. Although digital control systems can conduct multitask control, system optimizations are required while the task becomes complex. Due to different configurations and characters of systems, the methods of optimization are different according to different digital control system. To enhance the effectiveness of the system optimization method, the analysis of the characteristic and structure for the systems must be performed. Deriving different optimization method according to different characteristic is the best strategy of applying optimization theory to real project.Based on the characters of digital control system and the theory of optimization control, this paper studies the optimization method of two practical digital control systems according to the system models and demands. Then a simulation system is developed, which is applied to real systems. The main detailed research works can be described as follows:1) The necessity of optimization studies in digital control system is proposed based on digital control system and optimization control problem.2) Optimization controller for linear discrete-time state space model is designed.Based on the linear programming, the optimal l_∞ output error sequence for lineardiscrete-time system is developed. Then the optimal minimum realization and closed-loop poles of the closed-loop system can be achieved. Furthermore the optimal controller can be given by pole placement and dynamic feedback. This method associates performance in the time domain with system robust stability.3) Optimization controller for single intersection is designed. Based on analysis of optimal control problem on intersection, this paper sets up a object-oriented general model, which describes the single intersection with random crossings and random phases. A new signal control method was put forward, which optimizes the phases and green time separately, transfers the traffic of intersection in real time. The new method is practical and easy to be realized.