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

The Korean Institute of Power Electronics (전력전자학회)
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Performance Evaluation of Islanding Detection Method by Phase Shifted Feed-Forward Voltage in Steady-State Grid Condition

전향보상 전압의 위상 변화를 통한 단독운전 검출 방법의 계통 정상 상태의 성능 평가

  • Kim, Dong-Uk (Division of Electrical Eng., Hanyang University, ERICA Campus) ;
  • Kim, Sungmin (Division of Electrical Eng., Hanyang University, ERICA Campus)
  • Received : 2018.07.13
  • Accepted : 2018.07.28
  • Published : 2018.12.20
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Abstract

This study proposes a new islanding detection method that uses the phase shift of feed-forward voltage and evaluates the performance of an existing method and the proposed method when the grid frequency changes within the allowable range under steady-state conditions. The investigated existing method, which is slip mode frequency shift (SMS), uses current phase shift to detect islanding. The SMS method supplies reactive current to the grid under this condition, but the proposed method does not generate additional reactive power because it does not depend on the current control loop. The performance in steady-state grid condition is evaluated through simulations and experiments.

Keywords

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Fig. 1. Islanding detection test circuit.

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Fig. 2. Impedance characteristics of RLC load.

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Fig. 3. Control of grid connected single phase system with SMS IDM.

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Fig. 4. Non-Detection Zone for SMS IDM.

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Fig. 5. Synchronous reference frame PI-current controller with phase shifted feed-forward voltage method.

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Fig. 7. Current characteristics of SMS IDM in grid frequency variation condition.

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Fig. 8. Current characteristics of phase shifted feed-forward voltage IDM in grid frequency variation condition.

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Fig. 9. Experimental setup for anti-islanding detection.

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Fig. 10. Islanding detection performance of phase shifted feed-forward voltage IDM at Qf = 1 and 5.

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Fig. 11. Islanding detection performance of SMS IDM at Qf=10.

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Fig. 12. Islanding detection performance of phase shifted feed-forward voltage IDM at Qf=10.

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Fig. 13. Current characteristics with SMS IDM under grid frequency variation condition in experiment.

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Fig. 14. Current characteristics with phase shifted feed-forward voltage IDM under grid frequency variation condition in experiment.

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Fig. 6. Islanding detection performance of SMS IDM and phase shifted feed-forward voltage IDM.

TABLE I SIMULATION PARAMETER OF SINGLE PHASE INVERTER FOR ISLANDING DETECTION

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