Multi-agent Adaptive Virtual Inertia Cooperative Control of AC/DC Micro-grid Based on Virtual Synchronous Generators

Driven by new energy technology, the scale of AC/DC micro-grid connected to the power grid is growing. In order to make distributed power source have similar inertia support and damping characteristics as synchronous generator (SG), virtual synchronous generator (VSG) technology is introduced into inverter control. To solve the problems of frequency consistency and oscillation in the parallel operation of multiple VSGs, a multi-agent adaptive virtual inertia cooperative control strategy based on VSGs is proposed. Firstly, an advanced control method based on phase-locked loop is introduced to suppress the impact of frequency and power caused by grid connection. Then, a multi-agent adaptive virtual inertia cooperative control strategy is proposed to shorten the adjustment time required for the system to reach stability and improve the transient performance of the system. Finally, the simulation experiment verifies that the proposed control strategy can make the frequency of the parallel VSGs reach the same quickly, weaken the oscillation phenomenon in the frequency regulation process, and improve the transient performance of the system.