Optimization of Hybrid Energy Storage Strategy for Electric Vehicle Based on Super Capacitor

doi:10.16628/j.cnki.2095-8188.2021.11.009

Abstract

Abstract:

With the development of electrical vehicle (EV),shortcomings like low charging and discharging speed,large voltage fluctuation and short lifespan of battery become particularly prominent.Aimed at these shortcomings,a hybrid energy storage scheme for EV based on super capacitor (SC) is proposed,and its control strategy is optimized.Taking advantage of fast charging discharging rate of SC,it can quidely respond and compensate the motor transient power,so as to the bus voltage fluctuation and the frequency of the transient battery charging and discharging are reduced,the service life of battery is prolonged.Besides,current feedforward strategy is introduced into the conventional PI strategy to further increase the response speed.The hybrid energy storage system and the motor control system are simulated,the results show that the DC bus voltage variation is effectively limited and the energy quality is improved by the proposed hybrid energy system based on the proposed optimized control scheme through all working modes of EV.

Key words: hybrid energy storage, bidirectional DC/DC converter, super capacitor (SC), energy feedback, current feedforward

CLC Number:

TM46

ZHANG Chao, ZHANG Xin, XIE Zhanhong. Optimization of Hybrid Energy Storage Strategy for Electric Vehicle Based on Super Capacitor[J]. LOW VOLTAGE APPARATUS, 2021, 0(11): 58-66.

Figures/Tables 17

References 19

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部件	参数	数值
蓄电池	容值C_B/mF	6
蓄电池	初始电压U_Bint/V	144
超级电容	容值C_SC/mF	6
	初始电压U_SCint/V	102
	电阻值R_SC/Ω	1
	电感值L_SC/mH	1
开关器件MOSFET	通态电阻R_on/Ω	0.1
	二极管电阻R_d/Ω	0.01
	反向电阻R_S/kΩ	10
	反向电容C_S	无穷
	内部电感L_on	0
	二极管管压降U_f	0
电机	相电阻R_S/Ω	0.18
	电枢电感/mH	0.835
	磁链/N	0.071 47
	转动惯量J/(kg·m²)	0.000 62
	粘性阻尼F/(N·m·s)	0.000 303 5
	极对数p	4
	静摩擦T_f	0

参数	数值
转速环K_p	0.1
转速环K_i	0.002
输出上限/A	60
输出下限/A	-60

数轴	参数	数值
d轴	d轴电流环K_p	0.1
	d轴电流环K_i	0.02
	输出上限/V	72
	输出下限/V	-72
	d轴电流指令	0
q轴	q轴电流环K_p	0.1
	q轴电流环K_i	0.02
	输出上限/V	72
	输出下限/V	-72
	q轴电流指令	从转速环输入

参数	数值
基准母线电压U_dc/V	144
载波频率f_c/kHz	5
载波相位P_c	0

参数	数值
电压反馈K_p	0.005
电压反馈K_i	0.000 2
占空比初始值D_int	0.7
电流前馈参数I_q_factor	-2/U_dc
占空比输出上限	1
占空比输出下限	0