| With the continuous boosts of industrial automation and intelligentization process,energy issue has gradually become the major factor restricting the development of social economy.Solar energy as one clean and pollution-free energy source has been paid more and more attention from all over the world due to its abundant reserves.Meanwhile,Space Solar Power Stations(SSPS)being the main source of the future energy,is the key of the economy development for all countries worldwide.To analyze and verify the key technics and generating efficiency of SSPS,the ground demonstration system for space solar power generation needs to be constructed,including the optical collection,microwave energy transmission,power management,measurement and control platform and so on.In order to improve the efficiency of energy collection,conversion and transmission in the whole system,it is quite necessary to adjust the spatial pose of the OMEGA spherical concentrator as well as the pitch and azimuth angles of the microwave transmitting antenna in real time.Therefore,an overall scheme for a beam-pointing control system was proposed,and the research and development design of the hardware portion of the system was completed.During the design process,the specific research contents consist of:(1)using the motor control six-cable mechanism to realize the space position adjustment of concentrator;(2)using the motor adjustment platform to achieve the tilt and azimuth angle control of microwave transmission antenna;(3)Using a microwave power meter to measure and analyze the microwave power density distribution of the ground receiving antenna.Based on the above research contents,the following major tasks have been completed:(1)The general scheme of a beam-pointing control system consisting of a cable support control subsystem and a microwave transmission antenna control subsystem was proposed.In the system,a beam-pointing controller based on ARM+FPGA was used to adjust the space position of the concentrator and the pitch angle and azimuth of the microwave transmitting antenna.(2)According to the theory of field intensity distribution in the far field of a planar phased array antenna,the theoretical distribution formula of the microwave power density on the surface of the receiving antenna was deduced and simulated.Additionally,the distribution scheme for distribution measurement of microwave power meters were proposed.(3)According to the strategy and scheme of motion control,for the BPC,the hardware control circuits such as the core control,driver interface,and pulse conversion were designed;Implemented motor control logic design in FPGA and used S-curve acceleration and deceleration algorithm to achieve smooth motor output pulse control;Finally,ARM control program design was completed.(4)the experimental platform was constructed completely,including the host computer,BPC,motion platform,microwave power meter and TMAPI Tracker3 measurement devices.Both the functional tests and error analysis on the beam pointing controller of the SSPS demonstration system were performed,which verified the feasibility and rationality of the proposed hardware design for the beam pointing control system.And lay a solid foundation for the follow-up progress of the project. |
