Modular Multilevel DC/DC Converters with Phase Shift Control Scheme for High Voltage DC-Based Systems

ABSTRACT

In this paper, by investigating the topology derivation principle of the phase shift controlled three-level DC/DC converters, the modular multilevel DC/DC converters, by integrating the full-bridge converters and three-level flying-capacitor circuit, are planned for the high step-down and high power DC-based systems. The high switch voltage stress in the primary side is efficiently decreased by the full-bridge modules in series.

ZVS

Therefore, the low-voltage rated power devices can be employed to obtain the benefits of low conduction losses. More mostly, the voltage auto-balance ability among the cascaded modules is produce by the inherent flying capacitor, which removes the additional possible active components or control loops. In additional, zero-voltage-switching (ZVS)

CONVERTER

work for all the active switches can be supply due to the phase shift control scheme, which can reduce the switching losses. The circuit operation and converter work are consider in detail. Finally, the work of the given converter is verified by the simulation results.

 

KEYWORDS

  1. Modular multilevel DC/DC converter
  2. Phase shift control scheme
  3. Input voltage auto-balance
  4. Zero voltage switching

SOFTWARE: MATLAB/SIMULINK

CIRCUIT DIAGRAM:

Proposed modular multilevel DC/DC converter with input voltage auto-balance ability.

Fig.1. Proposed modular multilevel DC/DC converter with input voltage auto-balance ability.

SIMULATION RESULTS

image002 imulation waveforms: (a) Input voltage without flying capacitor and (b) Input voltage with flying capacitor.

Fig.2. Simulation waveforms: (a) Input voltage without flying capacitor and (b) Input voltage with flying capacitor.

Simulation result of primary voltage and current.

Fig.3. Simulation result of primary voltage and current.

Simulation result of ZVS operation: (a)ZVS operation for S11 and (b) ZVS operation for S14.

Fig.4. Simulation result of ZVS operation: (a)ZVS operation for S11 and (b) ZVS operation for S14.

image006

Fig.5. Simulation result of input voltage sharing.

Measured efficiency of proposed converter.

Fig.6. Measured efficiency of proposed converter.

CONCLUSION

In this paper, a novel phase shift controlled modular multilevel DC/DC converter is proposed and analyzed for the high input voltage DC-based systems. Due to the inherent flying capacitor, which connects the input divided capacitors alternatively, the input voltage is automatically shared and balanced without any additional power components and control loops.

DC/DC CONVERTER

Consequently, the switch voltage stress is reduced and the circuit reliability is enhanced. By adopting the phase shift control scheme, ZVS soft switching performance is ensured to reduce the switching losses. The modular multilevel DC/DC converter concept can be easily extend to N-stage converter with stacked full-bridge modules to satisfy extremely high voltage applications with low voltage rated power switches.

REFERENCES

  1. Kakigano, Y. Miura and T. Ise, “Low-Voltage Bipolar-Type DC Microgrid for Super High Quality Distribution,” IEEE Trans. Power Electron., Vol. 25, No. 12, pp. 3066-3075, Dec 2010.
  2. Anand and B. G. Fernandes, “Reduced-Order Model and Stability Analysis of Low-Voltage DC Microgrid,” IEEE Trans. Ind. Electron., vol. 60, No. 11, pp. 5040-5049, Nov 2013.
  3. Anand and B. G. Fernandes, “Optimal voltage level for DC microgrids,” IEEE Conf. Ind. Electron. (IECON), pp. 3034-3039, 2010.
  4. Salomonsson, L. Soder and A. Sannino, “An Adaptive Control System for a DC Microgrid for Data Centers,” IEEE Trans. Ind. Appl., vol. 44, No. 6, pp. 1910-1917, Nov./Dec. 2008.
  5. B. Park, G. W. Moon and M. J. Youn, “Series-Input Series-Rectifier Interleaved Forward Converter With a Common Transformer Reset Circuit for High-Input-Voltage Applications,” IEEE Trans. Power Electron., vol. 26, No. 11, pp. 3242-3253, Nov 2011.Modular Multilevel DC/DC Converters with Phase Shift Control Scheme for High Voltage DC-Based Systems

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