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논문 기본 정보

자료유형
학술저널
저자정보
Xin Tang (Changsha University of Science and Technology) Ruoshui Zhan (Changsha University of Science and Technology) Yanhui Xi (Changsha University of Science and Technology) Xianyong Xu (Changsha University of Science and Technology)
저널정보
전력전자학회 JOURNAL OF POWER ELECTRONICS JOURNAL OF POWER ELECTRONICS Vol.19 No.6
발행연도
2019.11
수록면
1,467 - 1,476 (10page)

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초록· 키워드

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Grid unbalanced faults can cause core saturation of power transformer and produce lower-order harmonics. These issues increase the electrical stress of power electronic devices and can cause a tripping of an entire HVDC system. In this paper, based on the positive-sequence and negative-sequence impedance model of a VSC-HVDC system as seen from the point of common connection (PCC), the resonance problem is analyzed and the factors determining the resonant frequency are obtained. Furthermore, to suppress over-voltage and over-current during resonance, a novel method using a virtual harmonic resistor is proposed. The virtual harmonic resistor emulates the role of a resistor connected in series with the commutating inductor without influencing the active and reactive power control. Simulation results in PSCAD/EMTDC show that the proposed control strategy can suppress resonant over-voltage and over-current. In addition, it can be seen that the proposed strategy improves the safety of the VSC-HVDC system under unbalanced faults.

목차

Abstract
I. INTRODUCTION
II. IMPEDANCE FREQUENCY OF A VSC-HVDC SYSTEM
III. PRINCIPLE OF VIRTUAL HARMONIC RESISTORS
IV. SIMULATION RESULTS
V. CONCLUSION
REFERENCES

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