Hybrid tramcar braking optimization method and system

Abstract

The invention discloses a hybrid tramcar braking optimization method and system. According to a fuel battery hybrid tramcar running line and a train positioning system, the braking is optimized; vehicle running data are recorded and analyzed by using a road condition recognition and vehicle positioning system; a braking starting point and a braking ending point are searched and determined; an SOCjudging point and an SOC adjusting section are set in front of a braking interval; according to a vehicle load state, SOC value of a super-capacitor is accurately adjusted; and therefore, maximizationof regenerative braking energy absoprtion of the super-capacitor in the braking section is guaranteed so that optimal braking is realized. According to the hybrid tramcar braking optimization methodand system, the absorption of the regenerative braking energy is enhanced on the premise of guaranteeing that the braking performance of the whole vehicle is not affected, the energy consumed on a braking resistor in the form of heat is reduced, the energy utilization rate is increased, the vehicle running hydrogen consumption is reduced, the vehicle running cost is reduced, and energy is saved.

Description

technical field [0001] The invention belongs to the technical field of hybrid electric car optimization, in particular to a hybrid electric car braking optimization method and system. Background technique [0002] The rapid development of rail transit has made important contributions to solving urban congestion, reducing air pollution, and improving travel quality. At this stage, trams generally adopt the catenary power supply mode, which has disadvantages such as high construction costs and damage to urban landscapes. Hybrid trams based on fuel cells do not need to erect catenary along the line because they carry their own active power source. It can effectively reduce the initial investment in tram line construction and shorten the line construction cycle. And it has the advantages of high energy conversion efficiency, less environmental pollution, and less stray current. In recent years, countries all over the world have invested in the research and development of fuel...

AI Technical Summary

Problems solved by technology

At present, for most trams powered by the traction network, the regenerative braking energy will be fed back to the traction network to increase the voltage of the traction network. The increase in the voltage of the traction network will cause damage to related electrical equipment, so measures need to be taken to absorb or dissipate it braking energy

At present, urban trams in my country mostly adopt resistance braking mode, and the regenerative braking energy is dissipated on the braking resistor in the form of heat energy. This method has a lot of energy waste, which is not conducive to the green and sustainable development of rail transit. idea

[0004] At this stage, the method of using supercapacitors for regenerative braking energy recovery of trams generally controls the SOC value of supercapacitors at a fixed value that can be charged and discharged, so as to ensure vehicle braking energy recovery and provide peak value for vehicle acceleration and climbing. power, but this method has not been optimized in combination with the actual operating circuit, and there are problems that regenerative braking energy cannot be completely absorbed and a large-capacity super capacitor needs to be configured

Images