Research On Cooling Device Control Strategy Of Concentrated Photovoltaic Power Generation System

In today’s world,global energy and environmental shortages cannot be underestimated.The utilization of new energy and sustainable development have gradually entered the stage of world progress,among which the utilization of solar energy is the most important.The concentrating solar energy use method can multiply the solar irradiance and use it on the surface of a small area of concentrated solar cells,which can greatly increase the power generation;at the same time,the small area of photovoltaic cells also reduces the cost,in The cost is further reduced in terms of economics.Although concentrating has the above advantages,the concentrating photovoltaic power generation system is severely restricted by the cooling problem.At present,the cooling devices widely used for heat dissipation of photovoltaic cells are air-cooled heat-dissipating devices and water-cooled heat-dissipating devices.Therefore,the main research purpose of this paper is to design a new control strategy for the cooling device of the concentrating photovoltaic cell power generation system.In order to solve the above problems,the research on the control strategy of the cooling device of the concentrating photovoltaic power generation system is completed.The research in this paper is as follows: First The concentrating photovoltaic power generation system and the cooling device control system are designed.The power generation system is divided into two parts: concentrating and power generation: the concentrating part is composed of a Fresnel lens concentrator and a control and tracking system,and the power generation part is composed of a gallium arsenide photovoltaic cell and an output control circuit;the cooling system is divided into cooling,Two parts are controlled: the cooling part consists of U-shaped water cooling fins and air-cooled fins overlapping,and the control part consists of a water pump and a temperature relay that controls the opening of the water pump.In this paper,according to the classification of the concentration ratio,four kinds of concentration ratios are selected for research.The control and tracking system adopts dual-axis control,and the automatic tracking function of the sun’s trajectory can be realized by the single-chip control.The photovoltaic cell is a three-junction gallium arsenide battery.According to the battery performance The matching MPPT and DC-DC circuits are designed,and the cooling system control part consists of a water pump and a temperature relay that controls the opening of the water pump.Second The working principle and process of the system are explained in detail.After fixing the concentrating part,power generating part and cooling part,adjusting the spot size and connecting the output control system,the photovoltaic cell starts to work.The temperature of the battery starts to change.When the temperature reaches the upper limit of the relay,the water pump is opened;If the temperature reaches the lower limit of the relay,the water pump shuts off,which reduces the energy consumption of the pump.At last,in terms of the overall operating system of the system,a power flow network and a power transmission model are established.The power model separates the system’s statistical X-ray model and the temperature of the photovoltaic cell.After the simulation analysis was carried out through the finite element analysis software of ANSYS Workbench to obtain the battery temperature under 4 concentration ratios and different solar irradiance,and the formula was used to calculate the switching threshold of the cooling device control strategy,the test results were predicted,and finally Validation tests were carried out.Through the comparison of the results,the control strategy of the cooling device of the concentrating photovoltaic power generation system designed in this paper is suitable.for the concentrating photovoltaic power generation system with a concentration ratio of 50-150 times,and the power generation performance is higher than that of the cooling device whose water pump is always on and the water pump is always off.The concentrating photovoltaic power generation system with the control strategy is better.According to the mathematical model of energy transfer and exergy efficiency and the data measured by the test,it is concluded that the maximum power generation efficiency can reach 23.23%,the maximum power generation power can reach 4.03 W,and the maximum exergy can reach 13.428 kWh Finally,The prediction results obtained from the test model are replaced by system simulation tests,and the simulation results correspond to the test results.This indicates that the system can achieve the expected performance results.