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Storage systems for microgrids

Storage systems for microgrids

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Change in the output of renewable energy considerably influences the quality of electric power in independent microgrids designed to realise local supply and consumption of energy. Accordingly, operating methods and costs were analysed for a microgrid incorporating two types of energy storage equipment: a sodium-sulphur (NaS) battery, and a hydrogen medium incorporating the OCHM. The installed capacity and cost were calculated, assuming an independent microgrid in Kitami City, a cold region in Japan. The OCHM-A system was designed to simulate energy storage similar to that of a battery, whereas OCHM-B was simulated to substitute power transmission or transportation of the OCHM.

Chapter Contents:

  • 4.1 Introduction: storage systems for microgrids
  • 4.2 Operation planning for a compound microgrid containing a PEFC and photovoltaics with prediction of electricity production using GA and NWI
  • 4.2.1 Introduction
  • 4.2.2 System configurations
  • 4.2.2.1 PEFC and photovoltaics compound microgrid
  • 4.2.2.2 System operation
  • 4.2.3 Analysis method
  • 4.2.3.1 Power system
  • 4.2.3.2 Heat balance
  • 4.2.3.3 Optimal analysis using GA
  • 4.2.4 Case analysis
  • 4.2.4.1 Equipment specifications
  • 4.2.4.2 GA parameters
  • 4.2.4.3 Energy-demand pattern
  • 4.2.4.4 Error of the NWI
  • 4.2.5 Results and discussion
  • 4.2.5.1 Operation planning
  • 4.2.5.2 Influence of the numerical weather information error
  • 4.2.5.3 Fuel consumption
  • 4.2.6 Conclusion
  • 4.3 Economic efficiency of a renewable energy-independent microgrid with energy storage using a sodium-sulphur battery or organic chemical hydride
  • 4.3.1 Introduction
  • 4.3.2 Proposed system
  • 4.3.2.1 Independent microgrid
  • 4.3.2.2 Independent microgrid with NaS batteries
  • 4.3.2.3 Independent microgrid with energy storage by an organic hydride
  • 4.3.3 System components
  • 4.3.3.1 Renewable energy
  • 4.3.3.2 Fuel cell
  • 4.3.3.3 NaS battery
  • 4.3.3.4 Energy storage in a hydrogen medium using an organic chemical hydride
  • 4.3.4 Control method
  • 4.3.4.1 Microgrid of the NaS battery type
  • 4.3.4.2 Microgrid of the OCHM type
  • 4.3.5 Analysis example
  • 4.3.5.1 Proposed system
  • 4.3.5.2 Performance and cost of equipment
  • 4.3.5.3 Analysis method
  • 4.3.6 Results and discussion
  • 4.3.6.1 Operational results for the NaS battery
  • 4.3.6.2 Installed capacity of the OCHM type microgrid
  • 4.3.6.3 Equipment cost
  • 4.3.6.4 Operational results for OCHM systems
  • 4.3.7 Conclusions
  • Nomenclature
  • References

Inspec keywords: sodium compounds; organic compounds; distributed power generation; secondary cells; power consumption

Other keywords: local energy supply; renewable energy; OCHM-B simulation; Kitami city; sodium-sulphur battery; energy storage equipment; Japan; OCHM-A system; electric power quality; energy consumption; NaS; storage systems; organic chemical hydride methylcyclohexane; independent microgrids; hydrogen medium

Subjects: Secondary cells; Distributed power generation

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