Research Of High-precision Dish Solar Concentrator Tracking Control

Accurate tracking control can greatly improve the thermal receive rate of solarconcentrator, thereby improve the efficiency of the solar power system. The researchof concentrator tracking control system has a significant effect on the reliable,steadily, high-efficiency operation of dish solar thermal power generation system.This thesis attempts to investigate the tracking control system of25KW dish solarconcentrator for in-depth analysis and design research.In order to guarantee the tracking accuracy of the25KW dish solar concentratortracking control system, the thesis adopts the systematically study methods and ahybrid tracking control method which mainly with open loop solar motion trajectorytracking, moreover, combines with closed loop sensor tracking for error compensationand confirms a tracking precision within0.0003degree of the SPA solar positionalgorithm, which is used to the solar motion trajectory tracking by comparing avariety of solar position algorithm. Based on the existing hardware system structure,software design is applied to the system, through which system main program design,initialization module, astronomy algorithm calculation module, manual and automaticgiven the sun location value module, move execution module and upper machinecontrol interface design is included. At the same time, the thesis implements thelaboratory testing and debugging based on the hardware and software design. Thesystem debugging and the field test data manifests that, the dish solar thermal powerplant mechanical device can basically realize the sun position location and trackingunder the control of tracking system, however, the tracking accuracy，speed andstability performance need further improvement for the design requirements.In view of the lower accuracy of concentrator tracking control system, somedefects may existing through the working process, such as slow response, poorstability of performance, poor anti-interference ability and so on. The thesis appliesthe self-adaptive fuzzy PID control algorithm to track and deviation correctfine-tuning, and presentes a simulation analysis of the dynamic responsecharacteristic of the concentrator tracking control system self-adaptive fuzzy PID controller. The results show that tracking precision, response speed, stability,anti-interference ability and other aspects of the system improves effectively afteradjusting, which provides a theoretical foundation for the further improvement of itsprecision, speed and stability in practical applications, and highlights the advantagesand value in use of intelligent control method in dish solar concentrator trackingcontrol system.