Model predictive control for bidirectional DC-DC converter of hydrogen fuel vehicles

doi:10.19799/j.cnki.2095-4239.2021.0210

Abstract

Abstract:

The bidirectional interleaved parallel DC-DC (BDC) converter is an important device for hydrogen fuel cell vehicle power supply reliability and energy recovery. The BDC converter experiences slow response speed, low stability, and output current ripple when using traditional control methods. Aiming at the above problems, a constrained model predictive current control is proposed. First, mathematical models for the various working modes of the BDC converter are established, and an improved current prediction model for the various working modes of the BDC converter based on the vector working principle is constructed. The cost function is then optimized to solve the problem of frequent switch jitter in the model predictive control process, and the control variable increment is added to the constraint condition; to solve the output current ripple problem, the model predictive control strategy is improved by calculating the switch duty cycle online. Finally, calculate the vector action time and create the cost function to achieve the control objective. The traditional current control method's response time and current ripples are 0.1 s and 5 A, respectively. In contrast, the improved MPC model predictive control response time and current ripples are 0.02 s and 1.5 A. The experimental and simulation comparison results show that Model predictive current control with constraints has a better dynamic response and stable performance, which verifies the algorithm's effectiveness.

Key words: hydrogen fuel cell, electric vehicle, bidirectional DC-DC converter, model predictive control, duty cycle

CLC Number:

TM 464

Siyan LIU, Bihua HU. Model predictive control for bidirectional DC-DC converter of hydrogen fuel vehicles[J]. Energy Storage Science and Technology, 2021, 10(6): 2046-2052.

Figures/Tables 11

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控制器参数	数值
直流输入侧电压u_BU/V	550
输出侧电压u_o/V	350
直流母线电容C/F	3×10³
电感L/uH	200
采样频率f_s/kHz	50

控制方法	超调量/A	响应时间/s	电流纹波/A
约束MPC	0.1	0.01	1.5
传统MPC	0.5	0.02	2.5
PI	15	0.05	5

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