Control Strategy of the Variable Coefficient Wind-Storage Combined System Participating in Power System Primary Frequency Regulation Based on the Rotor Speed and the State of Charge 
LI Weiguo, LIANG Zhihao
Journal of Northeast Electric Power University . 2025, (1): 83 -94 .  DOI: 10.19718/j.issn.1005-2992.2025-01-0083-12