Model Predictive Power Control for Bidirectional Series-Resonant Isolated DC–DC Converters With Fast Dynamic Response in Locomotive Traction System

Song, Wensheng; Zhong, Ming; Luo, Shucong; Yang, Shunfeng

doi:10.1109/tte.2020.3006135

Cited by 26 publications

(3 citation statements)

References 28 publications

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“…For the conventional EPS control, to minimize the backflow power of the DAB DC-DC converter, the internal shift ratio is calculated by the voltage conversion ratio and the rated power, then under this fixed internal shift ratio, the external shift ratio is adjusted by a closed-loop PID controller according to the output voltage error. In practical applications, the electrical parameters are uncertain [13,14], meanwhile, the load of the converter varies frequently [15,16]. However, the existing EPS control in the DAB converter calculates the internal shift ratio depending on the accurate parameters (capacitance, inductance, and rated power), thus it is difficult to get the required internal shift ratio in the practical application.…”

Section: Introductionmentioning

confidence: 99%

Model predictive control for DAB under extended‐phase‐shift considering components uncertainty

Jing

Ren

2023

IET Power Electronics

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For the dual active bridge (DAB) DC‐DC converters, parameter uncertainty (circuit parameters, input and/or load perturbations) affect their performance, such as the dynamic performance and backflow power. Here, to deal with the uncertainties, a robust model predictive control (RMPC) for the DAB DC‐DC converter under extended‐phase‐shift (EPS) control is proposed to improve dynamic performance and reduce the backflow power of the DAB for the first time. First, a cost function consisting of backflow power and the output voltage is established. Second, considering the uncertainty of the circuit parameters, a robust term is added to the prediction model to increase the robustness. Finally, the effectiveness and superiority of the proposed method are verified by experiments and comparisons with existing methods. The proposed RMPC method shows superior performance in the sense of improved dynamic performance and reduced backflow power.

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Section: Introductionmentioning

confidence: 99%

Model predictive control for DAB under extended‐phase‐shift considering components uncertainty

Jing

Ren

2023

IET Power Electronics

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“…A small-signal model of DBSRC is further introduced in [17] and model-predictive control has been investigated in [18]. All these feedback control strategies ignore the transient state in the analysis as the converter adapts to different transfer power demands.…”

Section: Introductionmentioning

confidence: 99%

Transient Modulation for the Step-Load-Change Process in a Dual-Bridge Series Resonant Converter

Zhou

et al. 2022

Electronics

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A phase-shifted dual-bridge series resonant DC-DC converter (DBSRC) is a competitive candidate for applications of an energy storage system. At the request of a step-load-change command such as the start-up and power-level change, the converter may suffer from large-amplitude transient oscillations due to improper transient modulation. Furthermore, the DC bias current and overshoot current/voltage in the resonant tank and transformer caused by oscillations may result in transformer saturation and poor dynamic performance. To solve these problems, two fast transient modulation (FTM) methods are proposed in this paper. First, based on the steady-state analysis of the converter with phase-shift control, the current and voltage trajectory of the resonant capacitor can be obtained. Then, the detailed principles of two FTM methods are explained for achieving a smooth transition. Through the adjustment of the durations of the adjacent switching intervals temporarily, the transient trajectory can be predicted and is expected to match the destination trajectory within one switching period. Consequently, the proposed FTM methods enable the converter to move from one steady state to another instantly and the step-load-change transition can be an overshoot-free procedure. Finally, both simulation and experimental tests prove that the two modulation methods can effectively eliminate DC bias current and overshoot current/voltage in the DBSRC transient process and obtain a fast transient response.

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“…In recent years, with the development of power electronics technology, the application of isolated DC-DC converter in vehicle auxiliary power supply [1], microgrid [2], offshore wind power [3][4][5], electric locomotive traction [6][7][8][9][10], DC power grid [11] and other important fields is gradually increasing. Medium frequency transformer (MFT) is a key equipment of an isolated DC-DC converter [12].…”

Section: Introductionmentioning

confidence: 99%

Analysis of temperature field of medium frequency transformer based on improved thermal network method

Huang

Liu

et al. 2022

IET Generation Trans & Dist

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Medium frequency transformer (MFT) plays a key role in future power systems and new energy systems. It is very important for the safe operation of MFT to correctly calculate the temperature rise and hot spot position. According to the heat dissipation of transformer, the equivalent thermal network model of the core-type transformer is established in this paper. The traditional thermal network model ignores the heat dissipation of the magnetic core column and the inner surface of the yoke to the air. In this paper, the magnetic core column is divided into the air surrounding part and winding surrounding part. The heat dissipation on the inner surface of the yoke is further considered. The improved thermal network model is verified by finite element simulation. The results show that compared with the traditional thermal network model, the improved thermal network model proposed in this paper can more comprehensively analyse the temperature field distribution and calculate the node temperature more accurately.

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Model Predictive Power Control for Bidirectional Series-Resonant Isolated DC–DC Converters With Fast Dynamic Response in Locomotive Traction System

Cited by 26 publications

References 28 publications

Model predictive control for DAB under extended‐phase‐shift considering components uncertainty

Model predictive control for DAB under extended‐phase‐shift considering components uncertainty

Transient Modulation for the Step-Load-Change Process in a Dual-Bridge Series Resonant Converter

Analysis of temperature field of medium frequency transformer based on improved thermal network method

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