The Transactions of the Korean Institute of Power Electronics (전력전자학회논문지)

The Korean Institute of Power Electronics (전력전자학회)
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DC-Voltage Regulation for Solar-Variable Speed Hybrid System

태양광 기반의 가변속 하이브리드 시스템을 위한 직류 전압 제어

  • Niyitegeka, Gedeon (School of Electrical Eng., Chungbuk National University) ;
  • Lee, Kyungkyu (School of Electrical Eng., Chungbuk National University) ;
  • Choi, Jaeho (School of Electrical Eng., Chungbuk National University) ;
  • Song, Yujin (Energy Efficiency Research Division, Korea Institute of Energy Research)
  • Received : 2016.02.01
  • Accepted : 2016.03.29
  • Published : 2016.06.20
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Abstract

Recently, the interest in DC systems to achieve more efficient connection with renewable energy sources, energy storage systems, and DC loads has been growing extensively. DC systems are more advantageous than AC systems because of their low conversion losses. However, the DC-link voltage is variable during operation because of different random effects. This study focuses on DC voltage stabilization applied in stand-alone DC microgrids by means of voltage ranges, power management, and coordination scheme. The quality and stability of the entire system are improved by keeping the voltage within acceptable limits. In terms of optimized control, the maximum power should be tracked from renewable resources during different operating modes of the system. The ESS and VSDG cover the power shortage after all available renewable energy is consumed. Keeping the state of charge of the ESS within the allowed bands is the key role of the control system. Load shedding or power generation curtailment should automatically occur if the maximum tolerable voltage variation is exceeded. PSIM-based simulation results are presented to evaluate the performance of the proposed control measures.

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References

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