Multi-Disturbance Factors Analysis and Suppression Strategy of Sub-Synchronous Oscillation on DFIG Grid-Side Converter

This paper focuses on the power grid oscillation of grid-side converter (GSC) in doubly-fed induction generator (DFIG) caused by sub-synchronous (SSO), and designs a measure to improve output quality GSC. Firstly, influence mechanism multipath disturbance GSC under SSO is sorted out, factors action modes are clarified. Secondly, estimation phase-locked loop (PLL) control strategy calculation process analyzed. Furthermore, mathematical model considering PLL established. At same time, key for suppression determined analyzing effect quasi-resonant controller when amplitude, frequency phase change. Based above theoretical analysis research, resonant used eliminate error PLL; at an adaptive algorithm designed according characteristic changes fixed controller, DFIG-GSC based proposed, thus eliminating improving its output. Finally, effectiveness proposed verified simulation experimental results.