Abstract
The increasing presence of wind power in power systems will likely drive the integration of large wind farms with electrical networks that are series-compensated to sustain large power flows. This may potentially lead to subsynchronous resonance (SSR) issues. In this paper, a supplementary controller on the grid-side converter (GSC) control loop is designed to mitigate SSR for wind power systems based on doubly fed induction generators (DFIGs) with back-to-back converters. Different supplementary controller feedback signals and modulated-voltage injecting points are proposed and compared based on modal analysis and verified through root locus analysis to identify the optimal feedback signal and the most effective control location for SSR damping. The validity and effectiveness of the proposed supplemental control are demonstrated on the IEEE first benchmark model for computer simulations of SSR by means of time domain simulation analysis using Matlab/Simulink.
Highlights
Wind energy has proven to be a clean, abundant and completely renewable source of energy, and the large penetration of wind energy into the power grid indicates that wind energy is considered an effective means of power generation
This paper extends the initial study presented in [10] and focuses on selecting the optimal feedback signal and the most effective modulated-voltage injecting point of supplementary controller for suppressing subsynchronous resonance (SSR)
It is found that a supplementary controller with the rotor speed as the feedback signal and modulated-voltage injection to the d-axis of the grid-side converter (GSC) outer loop and the d-axis of the GSC inner loop can damp the SSR mode effectively, while the modulated-voltage injection to the q-axis of the GSC inner loop cannot damp the SSR mode
Summary
Wind energy has proven to be a clean, abundant and completely renewable source of energy, and the large penetration of wind energy into the power grid indicates that wind energy is considered an effective means of power generation. Different supplementary controller feedback signals and modulated-voltage injection points are proposed and compared based on the modal controllability, observability and residue, and the best feedback signal and the effective controlling point are identified to achieve satisfactory performance for damping SSR in a serial-compensated DFIG-based wind farm. The paper is organized as follows: Section 2 describes the system structure of a DFIG-based wind farm with a series-compensated line; Section 3 presents the modal analysis rules and their effects; Section 4 gives the modal-based analysis and root local diagram-based verification needed to choose the optimal supplementary controller feedback signal and most effective modulated-voltage injecting point for the SSR damping; Section 5 gives the time domain simulation results to demonstrate the effectiveness of the SSR damping controller.
Sign-in/Register to view highlights & summary Sign-in/Register to access full text options 
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 callDisclaimer: 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.
