Stability Analysis of High Permeability Wind Power with Inertial Control Connected to AC-DC Hybrid Transmission System

To research the stability under the condition of connecting high-permeability wind power in AC-DC hybrid power transmission system, firstly, a low-frequency oscillation analysis model, in which the doubly-fed induction generator (abbr. DFIG) containing inertial control was connected in the AC-DC hybrid system with frequency limit control (abbr. FCL), was established. Secondly, the influence of the DFIG unit containing inertial control on the inter-area oscillation mode of AC-DC hybrid network under different permeabilities was analyzed. Thirdly, the influence rule of putting frequency limit controller for DC transmission system into operation on both system damping characteristic and frequency characteristic was analyzed. Research results show that adopting inertia control of DFIG and FLC of HVDC transmission system under high permeabilities could increase system damping and suppress low-frequency oscillation. Finally, above-mentioned results of stability analysis are verified by time-domain simulation by Matlab/Simulink software.