Study On Performance Of MPPT Regulator For Generating Electric Power With Differential Exhaust Temperature Of Automobile

The problem of energy has become the focus of all countries in the world.Non-renewable resources are gradually exhausted.The rapid development of the automobile industry further aggravates the energy consumption and environmental pollution.Countries in the word improve fuel automobile exhaust emission standards,China has implemented ?emissions standards.However,the consumption of fuel and environmental pollution is inevitable.As a new green energy technology,semiconductor thermal power generation technology can convert the residual heat of automobile exhaust into electric energy.However,due to the limit of the performance of thermoelectric materials,the efficiency of thermoelectric power generation technology is relatively low at present.Thermoelectric materials have not made a breakthrough.We can follow the MPPT(Maximum Power Point Tracking)technology,used in photovoltaic power generation to obtain the electric energy generated by the thermoelectric power generation device to the greatest extent,so as to make up for the low efficiency of the thermoelectric power generation technology.This paper mainly studies the low efficiency of thermoelectric power generation technology supplemented by MPPT technology.The main research contents are as follows:1.Temperature difference generator is used as power source tocharge external batteries in this paper.The effects of MPPT regulator and DDC regulator on charging efficiency are studied.It is found that the performance of MPPT voltage regulator is not as stable as that of DDC voltage regulator.The performance of the MPPT voltage regulator is similar to that of the DDC voltage regulator under low temperature difference(80?~140?).The performance of some MPPT voltage regulators is even worse than that of DDC voltage regulator.However,when the temperature difference reaches 180?,the performance of MPPT voltage regulator is better than that of DDC voltage regulator.It is concluded that the performance of MPPT voltage regulator is better than that of DDC voltage regulator under the condition of large temperature difference or enough power generated by the temperature difference generator.The validity and necessity of using temperature difference power generation technology combined with MPPT technology are verified.2.Based on the performance experiment of MPPT regulator,a series of experiments were carried out on a simulated vehicle exhaust bench.The effects of vehicle exhaust speed and temperature on the power generation performance of thermoelectric generator were mainly studied.The load characteristics,heat collection efficiency,TE efficiency and pressure drop were discussed and analyzed.The average collector efficiency is 46.5%,while the effective collector efficiency is 36.6%,theaverage TE efficiency is 2.88%,and the maximum pressure drop is only36 Pa.The experimental data before and after optimization are compared and analyzed.The experimental results show that the average heat collection efficiency increases from 46.5% to 54.6%,and the average effective heat collection efficiency increases from 36.6% to 39.4%.3.In order to further verify the performance of MPPT regulator is better than that of DDC regulator in the case of large temperature difference or enough power from thermoelectric generator,this paper compares MPPT regulator with DDC regulator on a simulated vehicle exhaust bench.The experimental results show that MPPT regulator is better than DDC regulator.The conversion efficiency of MPPT regulator is 91.2%,while that of DDC regulator is 79.2% and 77.5%,respectively.