Method of Stability Margin Improvement for Offshore Wind Power Integration System Based on GFM Control Technology

The renewable energy sources (RESs) dominated power grid is an envisaged infrastructure of the future power system, where the commonly used grid following (GFL) control for grid-tied converters suffers from lacking grid support capability, low stability, etc. Recently, emerging grid forming (GFM) control methods have been proposed to improve the dynamic performance and stability of grid-tied converters This paper takes two common grid-connected converters as an example, firstly introduces their control strategies and mathematical models, then analyses the influence of grid-connected control technology on the oscillation characteristics of the power system, and finally elucidates the mechanism of grid-connected control technology on the improvement of system stability margin from the perspective of impedance characteristics.