[논문]Positive Feedback을 이용한 무효전력 P&O 단독운전 검출기법

이종원; 박성열; 이재연; 최세완

doi:10.6113/tkpe.2022.27.5.410

Positive Feedback을 이용한 무효전력 P&O 단독운전 검출기법
Reactive Power P&O Islanding Detection Method using Positive Feedback 원문보기

전력전자학회 논문지 = The Transactions of the Korean Institute of Power Electronics, v.27 no.5, 2022년, pp.410 - 416

이종원 (Dept. of Electrical & Information Eng., Seoul Nat'l Univ. of Science and Technology) , 박성열 (Dept. of Electrical & Information Eng., Seoul Nat'l Univ. of Science and Technology) , 이재연 (Dept. of Electrical & Information Eng., Seoul Nat'l Univ. of Science and Technology) , 최세완 (Dept. of Electrical & Information Eng., Seoul Nat'l Univ. of Science and Technology)

Abstract ▼ AI-Helper

A grid-connected inverter with critical loads uses mode transfer control to supply stable voltage to the load. An islanding detection method should also be used to quickly detect the grid fault and disconnect the inverter from the grid. However using the existing islanding detection method to detect islanding is difficult due to the small fluctuation of the voltage and frequency of the point of common coupling. This study proposes a reactive power P&O islanding detection method by using the positive feedback technique. The proposed method always injects a small variation of reactive power. When a grid fault occurs, the injected reactive power accelerates the reactive power injection reference. As a result, the reactive power reference value and the sensed reactive power become mismatched, and islanding is detected. Reducing the amount of real-time injected reactive power results in high efficiency and power factor. The simulation and experimental results of a 3 kW single-phase inverter are provided to verify the proposed islanding detection method.

주제어

표/그림 (11)

그림 Fig. 1. Islanding detection methods.
그림 Fig. 2. Non-detection zone of passive detection method.
그림 Fig. 3. Conventional reactive power variation islanding detection method.
그림 Fig. 4. The scheme of islanding test circuit.
그림 Fig. 5. Proposed reactive P&O anti-islanding method using positive feedback.
그림 Fig. 6. Operating principle of the proposed anti-islanding method.
그림 Fig. 7. Simulation waveforms under resistive load. (a) P_inv = 1.5kW, P_load = 3kW, (b) P_inv = 3kW, P_load = 1.5kW
표 TABLE I THE SYSTEM SPECIFICATION
그림 Fig. 8. Simulation waveforms under RLC load. (quality factor = 1.0, Pinv = 3kW), (a) Qinv = 30var, (b) Qinv = -30var
그림 Fig. 9. Experiment result under resistive load condition. (a) Pinv = 1.5kW, Pload = 3kW, (b) Pinv = 3kW, Pload = 1.5kW
그림 Fig. 10. Experiment result under R load condition. (Pinv = Pload)

참고문헌 (13)

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