Key concepts [microgrids]

Key concepts [microgrids]

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Microgrids can operate connected or isolated from a larger or main power system. The microgrid interconnected to a large-scale commercial power system depends, in many aspects, on the interconnected system. The author believes that the study of an independent microgrid is a good method to develop various interconnected microgrids. The key concepts, in a microgrid, are better presented as examples, highlighting the main aspects and characteristics of this type of small grids. Therefore, this chapter describes an example of a microgrid with a fuel cell combined cycle first. Next, the case of a microgrid with interconnected coal gasification fuel cell power generation and pumped hydropower generation is described.

Chapter Contents:

  • 2.1 Introduction: key concepts
  • 2.2 Dynamic-characteristics analysis of an independent microgrid with an SOFC triple combined cycle
  • 2.2.1 Introduction
  • 2.2.2 System configuration
  • SOFC triple combined cycle (SOFC-TCC)
  • Dynamic characteristics of independent microgrid
  • 2.2.3 Modelling of equipment
  • Solid oxide fuel cell
  • Gas turbine system
  • Steam turbine
  • Heat exchange
  • Photovoltaics
  • 2.2.4 System configuration of SOFC triple combined cycle
  • System configuration and control method
  • Power controls and frequency changes
  • 2.2.5 Analysis conditions
  • Equipment specifications and time constant
  • Parameters of PID control equipment
  • 2.2.6 Dynamic-characteristics analysis of an SOFC
  • 2.2.7 Dynamic characteristics of SOFC triple combined cycle (SOFC-TCC)
  • SOFC, G/T, load distribution of S/T
  • Load response characteristics
  • Load response characteristics with photovoltaics
  • 2.2.8 Conclusions
  • 2.3 Performance evaluation of an independent microgrid comprising an integrated coal gasification fuel cell combined cycle, large-scale photovoltaics and a pumped-storage power station
  • 2.3.1 Introduction
  • 2.3.2 Materials and methods
  • Overview of the system
  • Output model for the IGFC
  • Method of analysis
  • Expression of relations
  • Flow of the analysis algorithm
  • 2.3.3 Example of the proposed microgrid analysis
  • IGFC and conventional IGCC
  • Conditions for analysis
  • Cost
  • Electric power supply pattern
  • 2.3.4 Results of analysis and discussions
  • Power generation characteristics
  • Operation of the microgrid with the IGFC, large-scale photovoltaics and PSPG
  • 2.3.5 Conclusion
  • Nomenclature
  • References

Inspec keywords: power system interconnection; distributed power generation

Other keywords: fuel cell combined cycle; large-scale commercial power system interconnection; interconnected microgrids; interconnected coal gasification fuel cell power generation; pumped hydropower generation

Subjects: Distributed power generation; Power system management, operation and economics

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