Explicit Model Predictive Control of Bidirectional DC/DC Converter for Ultracapacitors Energy Storage Unit Applied to Light Rail Vehicle

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• 作者：Jianfeng Liu^* ; ^** ; Qing Yan^* ; ^** ; Xiaohui Qu^* ; ^** ; ^{hzw@mail.csu.edu.cn" class="auth_mail" title="E-mail the corresponding author} ; Fei Jiang^* ; ^** ; Weirong Liu^* ; ^** ; Zhiwu Huang^* ; ^**
• 关键词：ultracapacitors ; fast charging/discharging ; explicit model predictive control ; υ-resolution model ; optimal control
• 刊名：IFAC-PapersOnLine
• 出版年：2014
• 出版时间：2014
• 年：2014
• 卷：47
• 期：3
• 页码：10293-10298
• 全文大小：481 K

文摘

Ultracapacitors are popular as an energy storage device for the light rail regenerative power system. However, the control of the DC/DC converter is a challenging problem to meet the fast charging/discharging of ultracapacitors. In this paper, a precise discrete-time converter model and an explicit model predictive control scheme is proposed to address this issue. A converter model is presented by using a υ-resolution method, which can capture the hybrid nature of the ultracapacitors in the form of piecewise affine. Based on this model, an optimal control problem with the constraints of the duty cycle and the system parameters is formulated. Then the control law is calculated by using multi-parameter programming. The resulting explicit solution can be easily stored and utilized in a lookup table. The proposed scheme can reduce the amount of on-line calculation and achieve the real-time control of the system. Simulation and experiment validate the effectiveness of the proposed scheme.