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논문 기본 정보

자료유형
학술저널
저자정보
Zhenbin Fu (University of Science and Technology of China) Zhihua Feng (University of Science and Technology of China) Xi Chen (State Grid Hefei Power Supply Company) Xinxin Zheng (Hefei University of Technology) Jing Yin (University of Science and Technology of China)
저널정보
전력전자학회 JOURNAL OF POWER ELECTRONICS JOURNAL OF POWER ELECTRONICS Vol.18 No.5
발행연도
2018.9
수록면
1,347 - 1,356 (10page)

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In a three-phase system, three-phase AC signals can be translated into two-phase DC signals through a coordinate transformation. Thus, the PI regulator can realize a zero steady-state error for the DC signals. In the control of a three-phase grid-connected inverter, the phase angle of grid is normally detected by a phase-locked loop (PLL) and takes part in a coordinate transformation. A novel control strategy for a three-phase grid-connected inverter with a frequency-locked loop (FLL) based on coordinate transformation is proposed in this paper. The inverter is controlled as a current supply. The grid angle, which takes part in the coordinate transformation, is replaced by a periodic linear changing angle from –π to π. The changing angle has the same frequency but a different phase than the grid angle. The frequency of the changing angle tracks the grid frequency by the negative feedback of the reactive power, which forms a FLL. The control strategy applies to non-ideal grids and it is a lot simpler than the control strategies with a PLL that are applied to non-ideal grids. The structure of the FLL is established. The principle and advantages of the proposed control strategy are discussed. The theoretical analysis is confirmed by experimental results.

목차

Abstract
I. INTRODUCTION
II. IMPACT OF COORDINATE TRANSFORMATIONS
III. THE PROPOSED CONTROL STRATEGY
IV. EXPERIMENTAL RESULTS
V. CONCLUSION
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