DA / MA: Model Predictive Control for DC-DC Converters (Datei als Download)


In the power range of some tens of kilowatts the flexible and programmable TopCon DC power supplies from the company Regatron AG are widely used as test equipment for batteries, fuel cells, solar inverters, electrical and hybrid drive trains. Benefiting from its full digitally controlled phase-shifted full bridge (PSFB) topology it can be operated in a wide operation range (POut = 0 … PRat) and be applied for simulating the characteristics of batteries, PV-arrays and generating user defined U-I characteristics.

However, due to the relative high conduction losses caused by circuiting current, the power efficiency and switching frequency of the PSFB topology are limited. Hence, a further reduction of the output filter and a further improvement of the system dynamics are difficult. Furthermore, due to the required very wide operation range it operates both in continuous conduction mode (CCM) and discontinuous conduction mode (DCM). The open-loop dynamical characteristics and the control requirements for these both operation modes are very different, which makes it harder to achieve an overall high dynamics by using standard linear control strategies.

In order to overcome these problems new converter topologies and/or advanced control strategies are investigated in this project. In frame of this work a systematic investigation of model predictive control for DC-DC converters shall be implemented.






In details:

Preparatory  work

  • State of the art review: model predictive control (MPC) for DC-DC converter
  • Implementation of MPC for a simple buck converter based on an example
  • Develop the final specification and work plan for the main work
  • Midterm oral presentation

Basic specification of the main work

  • Application of MPC for phase-shifted full bridge (PSFB) [i]
    • Design and simulative implementation of a linear controller for PSFB
    • Design and simulative implementation of a MPC for PSFB
    • Comparison: Linear controller vs. MPC
  • Application of MPC for LCC resonant converter with LC output-filter (LCC-LC) [ii]
    • Design and simulative implementation of a linear controller for LCC-LC
    • Design and simulative implementation of a MPC for LCC-LC
    • Comparison: Linear controller vs. MPC
  • Real-time implementation
    • Real-time implementation of MPC in a digital signal processor (DSP)
    • Measurement and validation
  • Documentation and oral presentation


[i] Analytical and simulation models of PSFB are available.

[ii] Analytical and simulation models of LCC-LC are available.


Contakt and Tutor

Dipl.-Ing. Zhiyu Cao, IW 1.625, Tel.: 05251 60-3413, E-Mail: cao[at]lea.upb.de     

AOR Dr.-Ing. Norbert Fröhleke, IW 0.619, Tel.: 05251 60-3881, E-Mail: frohleke[at]lea.upb.de

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