Power System Matching And Energy Management Strategy Research Of Dual-power Pure Electric Bus

Pure electric drive as the main melody of the development of China's automobile industry,from our"10^th-5"plan began to be included in the national development strategy,the importance of continuous increase in recent years,the relevant state ministries issued from the tax,purchase,operation,Facilities and other aspects of support policies.Trolleybus is a type of pure electric drive vehicle,currently in Beijing,Shanghai,Hangzhou and many have operations,is the use of urban trolley bus infrastructure,but there are trolley trolley,such as a high degree of dependence on the overhead line network,overhead line Construction of urban image and other issues,in recent years to promote the city gradually reduced.But the recent emergence of a new dual-source trolley bus to solve some of the traditional trolley bus there are overhead line construction and vehicle mobility flexibility problem,the use of dual-source advantage,such a new trolley bus about half of the mileage provided by overhead lines,The remaining mileage by the car energy storage system to power,power battery charging can also be achieved using wire mesh,overhead line network utilization higher.But between the vehicle and the overhead line through the insulator insulation,security is not high.Based on the above conditions,this paper makes full use of the existing aerial line foundation,combines the advanced electric drive system and the power battery system of the modern pure electric bus to match the system,and uses the isolated DC/DC to realize the electrical isolation of the overhead line and the vehicle.Vehicle safety.The main research contents include the following:Dual-source pure electric bus bus power system configuration,including the collector device,isolated DC/DC,energy-based power battery,the main drive motor;for dual-source pure electric bus operating line characteristics To analyze.To the actual trolley bus overhead line construction,mainly including the cable network and wireless network mileage ratio,combined with the characteristics of urban buses operating the design of the typical operation of the model,and analysis of vehicle driving Of the power demand characteristics.According to the vehicle's power,economic needs,and at the same time consider the wireless network construction line mileage requirements,to achieve vehicle power battery power and power,drive motor power matching and optimization.According to the results of the matching of the vehicle power system,the influence of the DC/DC on the isolated DC/DC is analyzed and the control and avoidance methods are put forward.The DC/DC is tested and verified according to the power requirements of the vehicle.Vehicle integrated braking energy management and in this case the braking energy recovery strategy,in the overhead line and power battery multi-energy coupling conditions,the motor,power battery,isolated DC/DC in the construction conditions of the vehicle Energy management strategy,as well as in the overhead line network voltage characteristics,the same line segment under the same time running under the line voltage,vehicle charging power,power battery SOC,vehicle power demand and other multi-car dynamic energy management strategy.And through the economic testing of the test-vehicle,under the conditions of the dynamic test,the vehicle matching and simulation results to verify.