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A Stable Operation Strategy in Micro-grid Systems without Diesel Generators

  • Choi, Sung-Sik (Dept. of Electrical Engineering, Korea University of Technology and Education) ;
  • Kang, Min-Kwan (Dept. of Electrical Engineering, Korea University of Technology and Education) ;
  • Lee, Hu-Dong (Dept. of Electrical Engineering, Korea University of Technology and Education) ;
  • Nam, Yang-Hyun (Dept. of Electrical Engineering, Korea University of Technology and Education) ;
  • Rho, Dae-Seok (Dept. of Electrical Engineering, Korea University of Technology and Education)
  • Received : 2017.08.09
  • Accepted : 2017.08.28
  • Published : 2018.01.01

Abstract

Recently, as one of the countermeasures to reduce carbon dioxide($CO_2$) for global warming problems, operation methods in micro-grid systems replacing diesel generator with renewable energy sources including wind power(WP) and photovoltaic(PV) system have been studied and presented in energetic manners. However, it is reported that some operation problems in micro-grid systems without diesel generator for carbon-free island are being occurred when large scaled WP systems are at start-up. To overcome these problems, this paper proposes an operation strategy in micro-grid systems by adapting control devices such as CVCF(constant voltage constant frequency) ESS(energy storage system) for constant frequency and voltage regulation, load control ESS for balancing demand and supply and SVC(static-var compensator) for reactive power compensation. From the simulation results based on the various operation scenarios, it is confirmed that the proposed operation strategy in micro-grid systems without diesel generators is a useful tool to perform a stable operation in micro-grid systems without diesel generator and also make a contribution to reduce carbon dioxide in micro-grid systems.

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Fig. 1. Concept of micro-grid system in Gapa-island

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Fig. 2. Operation case in micro-grid system without dieselgenerators

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Fig. 3. Concept of novel micro-grid system without dieselgenerator

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Fig. 4. Operation strategy for carbon-free island micro-gridsystem

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Fig. 5. DFIG WP system modelling

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Fig. 6. Modeling of wind power energy

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Fig. 7. Modeling of current control in PV system

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Fig. 8. Modeling of ESS for load control

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Fig. 9. Modeling of CVCF ESS

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Fig. 10. Exciter modeling of diesel generator

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Fig. 11. Governor modeling of diesel generator

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Fig. 12. Modeling of SVC

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Fig. 13. Modeling of total system

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Fig. 14. Characteristic of active and reactive powers duringstart-up in WP system

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Fig. 15. Frequency characteristic during startup in WPsystem

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Fig. 16. Voltage and frequency characteristics in micro-grid system with CVCF ESS

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Fig. 17. Voltage and frequency characteristics in existingmicro-grid system

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Fig. 18. Voltage and frequency characteristic in existingmicro-grid based on CVCF ESS

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Fig. 19. Voltage and frequency characteristic by proposedmethod

Table 1. Operation characteristics at start-up of WP system

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Table 2. Capacity of each component in micro-grid system

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Table 3. Operation strategies of micro-grid system

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Acknowledgement

Supported by : Korea Institute of Energy Technology Evaluation and Planning (KETEP)

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