| Solar energy has been widely used because it，s advantages of easy access and widely distributed. Compare with the tower solar thermal power system and trough solar thermal power system dish solar thermal power generation is the most efficient way of solar energy application， especially suite for small-scale distributed generation, and it has the higher research value to optimize the energy structure.Based on the analysis of dish solar thermal power system, the tracking control method of solar thermal power generation and double fed electric machinery to meet the need of grid conditions are studied. In the part of two axis tracking dish solar thermal power tracking control system has been analyzed and find a coordinate systems that can provide correct and effective data for the double axis tracking control system in order to track the sun light. Use MATLAB simulation to provide the horizontal coordinate data are validated of the coordinate system. Then through analysis and comparison, the obit tracking movement with sun sensor closed-loop tracking method is proposed which can improve the control precision and reduce the tracking cost. Last the article recommends in detail the programming technique of the control method. Use virtual instrument control system as the control section of selected system. Set up the experimental model to validate the correctness of the scheme. LabVIEW is chosen as the control software which combine simple graphical development environment with the “G” programming language, to simplify the programming of hard work. Using photosensitive resistance is responsible for the transmission of sensor signals, NI PCI/PXI-6221data acquisition card is responsible for Data collection， NI SCC-68data terminal is responsible for achieving the control of the motor. The correctness of the design method is verified by experiments.In this paper another important part of the double-fed generator grid is deeply analyzed. Then double fed motor synchronization conditions are analyzed with scalar analysis method and vector analysis method. And the control algorithm is improved to amend the controllable of the grid process and the accuracy of the closing point selection and solve the problem that enormous current impact problems from grid side and machine side phase can not completely synchronous. Also added in the detection circuit to real-time monitoring the running state of motor. Grid connected experiment model is build. Siemens MICROMASTER440general inverter is used to control prime motor and double fed electric machinery to meet the need of grid conditions. |
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