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

The Korean Institute of Power Electronics (전력전자학회)
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Control and Operating Modes of Battery Energy Storage System for a Stand-Alone Microgrid with Diesel Generator

디젤발전기가 포함된 독립형 마이크로그리드에서의 BESS 제어기법 및 운전모드 연구

  • Jo, Jongmin (Dept. of Electrical Eng., Chungnam National University) ;
  • An, Hyunsung (Dept. of Electrical Eng., Chungnam National University) ;
  • Kim, Jichan (Dept. of Electrical Eng., Chungnam National University) ;
  • Cha, Hanju (Dept. of Electrical Engineering, Chungnam National University)
  • Received : 2018.01.13
  • Accepted : 2018.01.29
  • Published : 2018.04.20
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Abstract

In this work, control methods and operating modes are proposed to manage standalone microgrid. A standalone microgrid generally consists of two sources, namely, battery energy storage system (BESS) and diesel generator (DG). BESS is the main source that supplies active and reactive power regardless of load conditions, whereas DG functions as an auxiliary power source. BESS operates in a constant voltage constant frequency (CVCF) control, which includes proportional-integral + resonant controller in a parallel structure. In CVCF control, the concept of fundamental positive and negative transformation is utilized to generate a three-phase sinusoidal voltage under imbalanced load condition. Operation modes of a standalone microgrid are divided into three modes, namely, normal, charge, and manual modes. To verify the standalone microgrid along with the proposed control methods, a demonstration site is constructed, which contains 115 kWh lead-acid battery bank, 50 kVA three-phase DC - AC inverter, and 50 kVA DG and controllable loads. In the CVCF control, the total harmonic distortion of output voltage is improved to 1.1% under imbalanced load. This work verifies that the standalone microgrid provides high-quality voltage, and three operation modes are performed from the experimental results.

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References

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