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

The Korean Institute of Power Electronics (전력전자학회)
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Performance Verification of Anti-Islanding of Reactive Power Variation Method using Positive Feedback

정궤환을 이용한 무효전력 변동기반의 단독운전 방지 성능 검증

  • Jo, Jongmin (Dept. of Electrical Engineering, Chungnam National University) ;
  • Shin, Chang-Hoon (Dept. of Electrical Engineering, Chungnam National University) ;
  • Cha, Hanju (Dept. of Electrical Engineering, Chungnam National University)
  • Received : 2018.09.28
  • Accepted : 2018.11.12
  • Published : 2019.04.20
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Abstract

This study proposed a reactive power variation (RPV) method equipped with positive feedback (PF) for detecting the islanding operation of distributed generation systems. The proposed RPV consists of the constant reactive power component and a certain reactive power term and uses the frequency deviation between the rated and the measured frequencies. The constant reactive power is injected from distributed generation system and power factor is to 0.9975 in grid-connected operation. PF is activated from generation of the frequency deviation and the injected reactive power is continuously increased due to PF when islanding occurs. Consequently, the increasing reactive power causes the point of common coupling frequency to deviate from the maximum/minimum threshold level. Performance of the proposed RPV is verified in a 1.7 kW T-type inverter, and the detection times are 53 and 150 ms.

Keywords

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Fig. 1. Test circuits of islanding detection.

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Fig. 2. Configuration of systems for islanding detection.

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Fig. 3. The proposed reactive power variation method based on positive feedback.

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Fig. 4. The proposed control algorithm of power conditioning system.

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Fig. 5. Simulation result of the conventional method.

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Fig. 6. Simulation result of the proposed method for detecting islanding in fmin.

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Fig. 7. Simulation result of the proposed method for detecting islanding in fmax.

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Fig. 8. The experimental configuration for verification of islanding detection.

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Fig. 9. Experimental results of the proposed method for performance verification.

TABLE I THE SYSTEM PARAMETERS

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References

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