GRID-CONNECTION CONTROL METHOD CONSIDERING SEASONAL TRANSITION FOR THE DUAL-NATURE (FOLLOWING-GRID AND FORMING-GRID) OF RENEWABLE ENERGY TRANSMISSION

Abstract

A grid-connection control method considering the duality of grid-following and grid-forming in renewable energy transmission during seasonal transitions includes: obtaining the short-circuit ratio (SCR) at the renewable energy grid connection point; when the SCR is greater than a preset SCR threshold, invoking a grid-following variable coefficient additional frequency control strategy to modulate the PWM inverter for renewable energy grid connection; and when the SCR is less than the preset SCR threshold, invoking a grid-forming variable coefficient virtual synchronous generator (VSG) control strategy to modulate the PWM inverter. The aim is to address the issue of how to combine grid-following and grid-forming control strategies to adapt to changes in grid strength due to seasonal transitions.

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