Abstract

The sub-synchronous oscillation(SSO) triggered by the large-scale access of wind power and power electronics have brought new challenges to the safe and stable operation of power system. When the doubly-fed induction generator(DFIG) is connected to weak grid by series compensation or connected to the multi-infeed DC system, there is a risk of SSO of wind turbines. Therefore, it is urgent to reveal the internal mechanism and propose mitigation strategies. Firstly, this paper introduces the equivalence modeling methods of the DFIG-based wind farm, including controlled source aggregation equivalence method, equivalent parameter equivalence method, single impedance equivalence method considering the collector system, and multi-machine equivalence method. Then, the main research methods of SSO in DFIG-based wind farm connected to complex system are discussed, including eigenvalue analysis method, impedance analysis method, frequency scan method, complex torque coefficient method, and time-domain simulation method. On this basis, the mitigation measures of SSO are summarized, which are divided into power-side mitigation method and grid-side mitigation method. Finally, the future research direction of SSO in DFIG-based wind farm connected to complex system is prospected to provide useful references for the long-distance safe and stable transmission of large-scale DFIG-based wind farms.

Talk to us

Join us for a 30 min session where you can share your feedback and ask us any queries you have

Schedule a call

Disclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.