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논문 기본 정보

자료유형
학술대회자료
저자정보
Dianlang Wang (CSG EHV Power Transmission Company) Peng Zhang (CSG EHV Power Transmission Company) Xiaoguai Cao (CSG EHV Power Transmission Company) Jing Chen (CSG EHV Power Transmission Company) Rui Zhang (CSG EHV Power Transmission Company) Hong Cao (CSG EHV Power Transmission Company) Hui Lai (Sichuan University) Hong Miao (Sichuan University) Chengbi Zeng (Sichuan University) Xiao Yang (Sichuan University)
저널정보
전력전자학회 ICPE(ISPE)논문집 ICPE 2023-ECCE Asia
발행연도
2023.5
수록면
2,398 - 2,403 (6page)

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To address the problems of inverter overcurrent and DC bus voltage fluctuation during voltage dips in two-stage grid-connected PV systems, this paper proposes a new power adaptive LVRT control strategy based on the front-to-back power relationship and U-I curve of PV arrays. Without adding additional hardware circuitry and the need of fitting the PV power curve, the control of PV output voltage is only based on the desired output power as well as the actual PV output current during voltage sag. And then, the output power of the PV array can be flexibly adjusted. Moreover, a fault decoupling step is added in the classical disturbance observation algorithm, which greatly saves the transient recovery time after low voltage ride-through and the PV system can transit to normal operating conditions more quickly after the voltage sag ends. Finally, the effectiveness of the proposed control strategy under different environmental conditions is verified by simulation. Compared with the LVRT control strategy based on the power curve of the PV arrays, the proposed strategy is more suitable to variable environmental conditions and has shorter transient recovery time, which improves the operational efficiency of the PV system.

목차

Abstract
I. INTRODUCTION
II. LOW VOLTAGE RIDE-THROUGH CONTROL STRATEGY
III. SIMULATION VERIFICATION AND ANALYSIS
IV. CONCLUSION
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