Application Research Of Tower Solar Energy Intelligent Control System

Solar energy because of its huge reserves and convenient cleaning, are becoming more andmore popular. Tower Solar energy thermal power generation system, also called tower solarenergy system, its structure relative to the conventional boiler power generation system is morecomplex, in addition to conventional boiler power generation system the necessary links, andthe heliostat field, heat collection drum, heat energy storage system. And the main energysource is solar energy. rather than produced by the combustion of the fuel chemical energy,solar energy has great instability, if it often appears cloudy, rain or other abnormal weather,solar power tower system thermal inertia and lag characteristics can overcome the energyperturbation bringing by short time cloud phenomenon, but solar radiation energy disappears atnight, in order to ensure the system power uninterrupted, the energy storage system andauxiliary boiler system need to be run to supplement the energy. This makes the mode of wholesystem in such a changing work environment get in continuous switching, so the whole systembetween each link must have good coordination and cooperation, in order to ensure that thepower system can work in normal and stable states.The structural complexity and solar instability of tower solar energy thermal powergeneration system determine the diversity of the whole system working modes, and thediversity of system working modes determine variability of decision and control strategies, andalso the complexity of design. Because the tower solar energy thermal power generation systemis still in the experimental stage in China, almost no one have proposed various modecoordinate control specific control strategy currently. And the main task of this design is todesign a intelligent controller that can switch system working mode automatically according tothe system working environment, and in each mode can well coordinate the working state ofvarious sub systems, which can make the system run stably, flexibly and efficiently in eachmode.The paper has analyzed the similarities and differences of tower solar energy thermalpower generation system and cement pure low-temperature waste heat power generationsystem, and also analyzed the work characteristics in common of heat collecting drum andwaste heat boiler drum. Because heat collecting drum operation data are difficult to obtain, the simulation model could not be established, this paper uses waste heat boiler drum simulationmodel instead of the heat collecting drum simulation model. According to the similarities ofcontrol requirements and control strategies and field operation data and historical data ofcement pure low-temperature waste heat power generation system, usingMATLABsimulationtool system identification toolbox, identifying waste heat drum for approximate simulationmodel. According to the direct energy balance (DEB) principle, based on traditionalboiler-turbine coordination control strategies, in input disturbance, this paper coordinatelycontrol several key links of the solar power tower system to guarantee slight fluctuation of thepressure before turbine, in order to ensure the stable operation of the system.Because the working modes of tower solar energy thermal power generation system arecomplex, and the precise mathematical model is hard to establish, and the strong couplingrelation exists between each link, it is difficult to use the traditional control methods based onprecise mathematical model to achieve satisfactory control effect. In this case the subject usedmulti-mode fuzzy control strategies according to several important parameters which canreflect the working states and stability of system. This paper used the similar object modelidentifying byMATLABsoftware to do simulation tests verifying that if the controller structureand parameters are selected rationality. The simulation results show that the selection ofparameters, can basically meet the needs of the stability of the system, but if it want to meet thehigher requirements, some control parameters still needs further improvement and adjustment.