Intelligent Power Allocation with Load Disturbance Compensator in Fuel Cell/Supercapacitor System for Vehicle Applications
Paper in proceedings, 2020

A fuel cell-based hybrid power system with a supercapacitor can downsize the fuel cell power rating and shows good dynamic characteristics. However, power distribution between fuel cell and supercapacitor is challenging, and inappropriate power allocation strategy will easily cause over-charge or overdischarge of supercapacitor. Also, the DC bus voltage fluctuation is always encountered during the acceleration and deceleration of the vehicle. This paper proposes an intelligent power allocation method based on a low-pass filter. The adaptive cut-off frequency is applied to avoid over-charging and over-discharging the supercapacitor, and the cut-off frequency is calculated by cutting the load spectrum with allocation ratio changing with the state of charge (SoC) of the supercapacitor. A load disturbance compensator is also proposed to suppress the DC bus voltage fluctuation when the load variation occurs. According to the hybrid system model developed with commercially available devices, the feasibility of the strategy is verified by MATLAB/Simulink. The simulation results show that the SoC of the supercapacitor is effectively controlled and the DC bus voltage fluctuation is significantly reduced.

fuel cell

power allocation

supercapacitor

voltage fluctuation

cut-off frequency

load disturbance compensator

Author

Qian Xun

Chalmers, Electrical Engineering, Electric Power Engineering, Electrical Machines and Power Electronics

Yujing Liu

Chalmers, Electrical Engineering, Electric Power Engineering, Electrical Machines and Power Electronics

Xiaoliang Huang

Chalmers, Electrical Engineering, Electric Power Engineering, Electrical Machines and Power Electronics

ITEC 2019 - 2019 IEEE Transportation Electrification Conference and Expo

489-494 9161756

2020 IEEE Transportation Electrification Conference & Expo (ITEC)
Chicago, IL, USA,

Floating voltage fuel cell drive system

Swedish Energy Agency, 2018-01-01 -- 2018-08-31.

Cost-effective drivetrains for fuel cell powered EVs

Swedish Electric & Hybrid Vehicle Centre (SHC), 2017-01-01 -- 2019-06-30.

Driving Forces

Sustainable development

Areas of Advance

Transport

Energy

Subject Categories

Communication Systems

Vehicle Engineering

Other Electrical Engineering, Electronic Engineering, Information Engineering

DOI

10.1109/ITEC48692.2020.9161756

ISBN

9781728146294

More information

Latest update

3/30/2021