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Bipolar-type DC microgrids for high-quality power distribution

Bipolar-type DC microgrids for high-quality power distribution

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During the last decades, AC systems dominated the power transmission and distribution applications almost exclusively. However, a recent convergence of needs originated in different sectors (renewable energy conversion, information technology and transportation) have accelerated the development of DC systems. Nowadays, DC systems are present at both transmission and distribution levels, offering high-performance solutions with enhanced efficiency and reliability, besides reducing the number of power conversion stages involved and uninterrupted power delivery. For LVDC active networks, two kinds of architectures are possible: unipolar and bipolar. Despite being a more sophisticated and technically complex solution, bipolar structure provide several advantages over conventional unipolar ones. Higher availability, efficiency and flexibility are just a few advantages featured by bipolar systems. This chapter presented a brief overview covering the different aspects of bipolar LVDC networks. Distribution converter topologies, balancing stages and also their control schemes are discussed in order to highlight the efforts being made in this growing architecture.

Chapter Contents:

  • 10.1 Introduction
  • 10.2 Bipolar-type DC distribution systems
  • 10.3 Topologies and operational aspects of bipolar LVDC grids
  • 10.3.1 Distribution converter topologies
  • 10.3.1.1 Two-level voltage source converter
  • 10.3.1.2 Three-level neutral point clamped converter
  • 10.4 Balancing topologies
  • 10.4.1 Bidirectional buck-boost topologies
  • 10.4.2 Coupled inductor current redistributor
  • 10.4.3 Three-level DC–DC current redistributors
  • 10.5 Control schemes
  • 10.5.1 Cascade control
  • 10.5.2 AC–DC converter control
  • 10.5.2.1 Single-phase AC–DC converter control
  • 10.5.2.2 Voltage-oriented control
  • 10.5.2.3 Direct power control
  • 10.5.2.4 Balancing leg control
  • 10.5.2.5 Symmetrical component control-based methods
  • 10.6 Summary
  • Acknowledgement
  • References

Inspec keywords: power distribution control; power convertors; distributed power generation

Other keywords: LVDC active networks; distribution converter topologies; bipolar structure; distribution control schemes; bipolar LVDC networks; power conversion stages; uninterrupted power delivery; high-quality power distribution; unipolar architectures; bipolar-type DC microgrids

Subjects: Control of electric power systems; Power convertors and power supplies to apparatus; Distributed power generation; Power system control

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