Design Of The Supply System For A New Type Tramcar With On-Board Supercapacitor Energy Storage

With the continuous development of urban transportation, new environmentally friendly trolley car, which is an important part of the strategy framework of comprehensive transportation development in urban areas, plays an important role in limiting car use number and realizing optimal allocation of urban road resources. Stored energy type 100% low-floor trolley car without Overhead Equipment feeding is especially favored in areas that require lots of headroom. However, how to safely and quickly charge the trolley car, ensure the departure interval time accurate and develop a new power supply system based on super capacitor is significantly important. Therefore, a set of charging device with 12-pulse rectifier and multiple DC-DC converter is studied and designed based on the Guangzhou trolley car project, and it is verified to be feasible through simulation and experiment. As to the study and design of the charging device, major research work completed is as below:Firstly, the line conditions and vehicle operating conditions in the trolley car project are analyzed and capacity of the on-board super capacitor is estimated through simulation. Furthermore, super capacitor bank module is formed through series connection of super capacitor unit and mathematical model of super capacitor energy storage system is built.Secondly, through analyzing the parameters of super capacitor and operating conditions of trolley car, the technical parameters of the charging device are set and charging device with 12-pulse rectifier and eightfold DC/DC converter based on carrier phase shift is designed. Meanwhile, model of the whole set of charging device is built on MATLAB/simulink, and waveforms of charging voltage and current during leaving and arriving of the trolley car under different conditions are gained through simulation of both up and down trolley car, at the same time, voltage and current waveforms of AC network side are also gained, which verifies the device in compliance with design requirements. That is, reliable and quick charging within 30 seconds is achieved and the output power energy has excellent quality, which can meet the needs of the trolley car. The design is further confirmed to be appropriate through experiments in laboratory.Finally, the monitoring software for the entire charging device is designed based on the communication between PLC and LabVIEW using OPC server and monitoring the whole system is realized. Main functions of the device include showing the electrical status, storing real-time data, playing waveform, checking fault records and setting some critical parameters.