Development of a Multi-Parallel Inverter with grid-forming capability for a power-to-gas system

To improve the stability of the power grid, this paper proposes a reliable multi-parallel inverter (MPI) system for power-to-gas (P2G) applications. The designed MPI is controlled by a novel virtual synchronous generator (VSG) control strategy to deal with the system inertia reduction and stability problems caused by the high penetration of the renewable sources uncertainties and sudden load variations. The MPI hardware and VSG control strategies have been developed and evaluated in this study. The experimental test results on a commercial MPI are presented in this paper. The performance evaluation has shown outstanding reliability improvement of micro-grid. Furthermore, the control strategy of the developed inverter can imitate the behaviors and properties of the traditional synchronous generators by regulating the voltage magnitude and frequency using active and reactive power adjustment. Finally, this paper evaluates the typical measured results with brief discussions to demonstrate the performance and feasibility of the proposed control method.