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Brayton-Moser passivity based controller for constant power load with interleaved boost converter.

P V Nithara1, R Anand1, J Ramprabhakar1

  • 1Department of Electrical and Electronics Engineering, Amrita School of Engineering, Amrita Vishwa Vidyapeetham, Bengaluru, India.

Scientific Reports
|November 16, 2024
PubMed
Summary
This summary is machine-generated.

A new Brayton-Moser passivity-based controller (BM-PBC) enhances DC microgrid stability with constant power loads. This advanced control improves efficiency and reduces current ripple compared to traditional methods.

Keywords:
Brayton–Moser passivity-based controllerConstant power loadDC microgridNon-linear controllerTwo-level IBC

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Area of Science:

  • Electrical Engineering
  • Power Electronics
  • Control Systems

Background:

  • DC microgrids with renewable energy sources utilize interleaved boost converters (IBCs) for improved performance.
  • Constant power loads (CPLs) introduce stability challenges in DC microgrids due to their nonlinear characteristics.
  • Conventional controllers struggle to maintain stability under CPLs and system uncertainties.

Purpose of the Study:

  • To introduce and analyze the Brayton-Moser (BM) passivity-based controller (PBC) for a 2-level IBC interfaced DC microgrid with CPL.
  • To enhance the stability of the DC microgrid system under nonlinear CPL conditions.
  • To evaluate the performance improvements offered by the BM-PBC.

Main Methods:

  • Development of a nonlinear BM-PBC for a 2-level IBC system.
  • Inclusion of a series-connected virtual impedance for improved signal stability.
  • Stability analysis using the Lyapunov stability approach.
  • System modeling and simulation in MATLAB/Simulink under various operating conditions.

Main Results:

  • The BM-PBC ensures high signal stability in the DC microgrid with CPL.
  • The proposed controller achieves a significant improvement in system efficiency.
  • A notable reduction in current ripple is observed with the BM-PBC.
  • Comparative analysis demonstrates superior performance over traditional PI controllers.

Conclusions:

  • The BM-PBC is a robust and effective control strategy for stabilizing DC microgrids with CPLs.
  • The controller offers substantial improvements in efficiency and current ripple reduction.
  • This approach provides a reliable solution for enhancing the stability and performance of renewable energy-based DC microgrids.