Coordinated control strategy for hybrid wind farms with DFIG-based and PMSG-based wind farms during network unbalance

Jun Yao*, Ruikuo Liu, Te Zhou, Weihao Hu, Zhe Chen

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12 Citationer (Scopus)

Abstrakt

This paper investigates the coordinated control strategy for a hybrid wind farm with doubly fed induction generator (DFIG)-based and direct-driven permanent-magnet synchronous generator (PMSG)-based wind farms during network unbalance. The negative-sequence current output capabilities of DFIG and PMSG systems under unbalanced grid voltage condition are described. Furthermore, by considering both the negative-sequence current capabilities and requirements of different control targets for each control unit, the controllable operating regions of DFIG and PMSG systems are investigated. According to the controllable operating regions, a targets selection scheme for each control unit is proposed to improve the stability of the hybrid wind farms containing both DFIG-based and PMSG-based wind farms during network unbalance, especially to avoid DFIG-based wind farm tripping from connected power grid under severe grid voltage unbalance conditions. Finally, the proposed coordinated control strategy is validated by the simulation results of a 30-MW-DFIG-based wind farm and a 30-MW-PMSG-based wind farm under different operation conditions and experimental results on a laboratory-scale experimental rig under severe grid voltage unbalance conditions.
OriginalsprogEngelsk
TidsskriftRenewable Energy
Vol/bind105
Sider (fra-til)748-763
Antal sider16
ISSN0960-1481
DOI
StatusUdgivet - maj 2017

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