Research On Auxiliary Power Supply System Of Electric Locomotive Based On Temperature Difference Power Generation

Electric locomotives generate a large amount of waste heat during driving,which not only results in the waste of energy but also creates a greenhouse effect.It is of great significance to study how to recover these waste heat for energy recovery.In this paper,semiconductor thermoelectric power generation technology is used to convert the residual heat generated by electric locomotives into electrical energy.After a series of circuit topology designs such as voltage regulation and charging,the converted power is optimized to be the available energy,which in turn provides a reliable electric energy for electric locomotives.By analyzing the basic principle of the thermoelectric power generation effect of semiconductors and the theory of heat energy transfer,and calculating the power of the electric locomotive waste heat recovery,a dynamic model of a semiconductor thermoelectric power generation device was set up,the equivalent circuit of the thermoelectric power generation was designed,and its electrical characteristics curve were obtained and analyzed.Aiming at the instability of the output voltage of the semiconductor thermoelectric generator,the main circuit of the thermoelectric power generation system is designed,including a voltage regulator circuit and a charging circuit,so that the energy is converted into energy that can be utilized,and the realization of the two-stage charging method enables charging to achieve better results.Combining the electrical characteristic curve of the thermoelectric generator and the main circuit of the energy storage system,the fuzzy control algorithm is proposed to track the maximum power point（MPP）.The results show that this control algorithm can better track the maximum power point than the disturbance observation method.Make the output have a good stability,so as to make better use of energy.The semiconductor thermoelectric power generation system is applied to different operating conditions of the CRH₂ electric locomotive auxiliary power supply system to analyze whether the output voltage and other parameters can meet the requirements.The establishment of simulation model and analysis shows that the system can convert the energy recovered from the heat radiation of the locomotive cooling fins into effective electric energy,so that the auxiliary power supply system of the electric locomotive has better safety and stability characteristics,increases the energy utilization rate,and effectively reduces energy waste.