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자료유형
학술저널
저자정보
Gum Tae Son (LS IS) Jung-Wook Park (Yonsei University)
저널정보
대한전기학회 Journal of Electrical Engineering & Technology Journal of Electrical Engineering & Technology Vol.13 No.2
발행연도
2018.3
수록면
550 - 558 (9page)

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This paper presents the current limit strategy of voltage controller of delta-connected Hbridge static synchronous compensator (STATCOM) under an unbalanced voltage fault event. When phase to ground fault happens, the feasibility to heighten the magnitude of sagging phase voltage is considered by using symmetric transformation method in delta-structure STATCOM. And the efficiency to cover the maximum physical current limit of switching device is considered by using vector analysis method that calculate the zero sequence current for balancing the cluster energy in delta connected H-bridge STATCOM. The result is simple and obvious. Only positive sequence current has to be used to support the unbalanced voltage sag. Although the relationship between combination of the negative sequence voltage with current and zero sequence current is nonlinear, the more negative sequence current is supplying, the larger zero sequence current is required. From the full-model STATCOM system simulation, zero sequence current demand is identified according to a ratio of positive and negative sequence compensating current. When only positive sequence current support voltage sag, the least zero sequence current is needed.

목차

Abstract
1. Introduction
2. Theoretical Analysis of Delta-connection H-bridge STATCOM
3. Control Method of Delta-connected H-bridge STATCOM
4. Voltage Compensation by STATCOM
5. Simulation Results
6. Conclusions
References

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