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논문 기본 정보

자료유형
학술저널
저자정보
Yiwen Geng (China University of Mining and Technology) Yawen Qi (China University of Mining and Technology) Pengfei Zheng (China University of Mining and Technology) Fei Guo (China University of Mining and Technology) Xiang Gao (China University of Mining and Technology)
저널정보
전력전자학회 JOURNAL OF POWER ELECTRONICS JOURNAL OF POWER ELECTRONICS Vol.18 No.5
발행연도
2018.9
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1,555 - 1,566 (12page)

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초록· 키워드

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Proportional capacitor–current–feedback active damping (AD) is a common damping method for the resonance of LCL-type grid-connected inverters. Proportional capacitor–current–feedback AD behaves as a virtual resistor in parallel with the capacitor. However, the existence of delay in the actual control system causes impedance in the virtual resistor. Impedance is manifested as negative resistance when the resonance frequency exceeds one-sixth of the sampling frequency (fs/6). As a result, the damping effect disappears. To extend the system damping region, this study proposes a virtual resistor–inductor–capacitor (RLC) AD method. The method is implemented by feeding the filter capacitor current passing through a band-pass filter, which functions as a virtual RLC in parallel with the filter capacitor to achieve positive resistance in a wide resonance frequency range. A combination of Nyquist theory and system close-loop pole-zero diagrams is used for damping parameter design to obtain optimal damping parameters. An experiment is performed with a 10 kW grid-connected inverter. The effectiveness of the proposed AD method and the system’s robustness against grid impedance variation are demonstrated.

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Abstract
I. INTRODUCTION
II. MODELING OF AN LCL-TYPE THREE-PHASE GRID-CONNECTED INVERTER
III. STABILITY ANALYSIS OF CURRENT CONTROL LOOP WITH PROPORTIONAL FEEDBACK OF CAPACITANCE CURRENT
IV. VIRTUAL RLC AD
V. EXPERIMENTAL RESULTS
VI. CONCLUSION
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