| Due to the shortage of energy and the deterioration of the living environment,renewable energy has been paid more and more attention.Among them,solar energy is especially favored by researchers.While photovoltaic power generation technology is maturing day by day,temperature always restricts the improvement of photoelectric conversion efficiency.In order to solve the problem of inefficiency of photovoltaic conversion caused by temperature rise when photovoltaic cell panel generates the electricity after receiving solar radiation,the present paper discussed about a method that the thermoelectric power generation technology could cool down the photovoltaic cell panel,this method is a kind of active cooling mode.However,when the temperature difference between the hot side and cold side of thermoelectric generator is close to each other,the thermoelectric conversion efficiency is too low,which had a negative effect on the device.To solve the above problem,the thermal switch was adopted to control the equipment.The specific contents of the study are as follows.Firstly,the principle of photovoltaic power generation technology and thermoelectric power generation technology are analyzed,and the relationship between photoelectric conversion efficiency and thermoelectric conversion efficiency and temperature is obtained by simulation.The concept of the combined power generation of the PV/TE(photovoltaic/thermoelectricity)is proposed,and the problem that the output is not stable due to the environmental temperature fluctuation of the thermocells is introduced,and the thermal switch is introduced to control the device,when the temperature of photovoltaic panel reaches the preset temperature,photovoltaic cells and thermocells generate electricity together,but only photovoltaic cells generate electricity when the preset value is not reached.Then,the experimental device is designed according to the concept,including the power generation part,the thermal switch part and the cooling part.The power generation part is composed of photovoltaic panels and thermoelectric cells,controlled by a dual-input DC-DC converter.The thermal switch is realized by motor and control circuit.In the cooling part,the flat heat pipe is used as the heat transfer body for heat dissipation.After completing the design of the combined generation device based on the thermal switch,a set of data monitoring system is developed to realize the real-time monitoring of the data.The system is divided into a data acquisition part,a data transmission part and an upper computer display part.The acquisition of each parameter in the test device and the working environment is realized through a sensor;the acquired data is uploaded by adopting a Zig Bee technology in a wireless transmission mode;and the data is displayed on the upper computer interface by the Lab VIEW programming.At last,the hybrid power generation system had been examined so as to test the property of hybrid power generation equipment which was based on PV/TE of thermal switch,combined with the algorithm of the hybrid power generation system,the test platform was built to test the device.The result revealed that the efficiency of hybrid power generation equipment was higher than a single electricity generating method included the photovoltaic power generation mode and the thermoelectric power generation mode.At the same time,the gradient utilization of energy could be realized by the equipment,improved the utilization rate of solar energy.The performance of the PV/TE hybrid power generation device based on thermal switch was investigated in two different ways,including the instant property and full-day performance test.During the instant property testing of the PV/TE hybrid power generation device based on thermal switch,the efficiency of power generation could reach the peak point of 19.45% and the output of power generation could reach the peak point of 32.15 W.The six-day full-day performance of the PV/TE hybrid power generation device based on thermal switch was tested,The results showed that the average power generating efficiency of the PV/TE hybrid power generation device based on thermal switch could reach 17.72% and its highest point could reach 18.37%. |
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