A virtual synchronous generator control strategy for distributed generation

As an approach to making distributed energy resources with virtual inertia, the virtual synchronous generator control strategy plays a significant role in the micro-grid stability. On the basis of theoretical derivation and analysis of virtual synchronous generator control and micro-grid, an overall virtual synchronous generator control strategy of distributed energy resources inverter was proposed to improve the stability of micro-grid. The outside control of distributed inverter was constructed by using synchronous generator´s rotor motion equation, primary frequency regulation feature and the delay characteristic of reactive power regulation. And the bottom control was adopted by the vector relationship of synchronous generator grid-connected to grid. Finally, a simple micro-grid digital simulation system based on Matlab/ Simulink was built, and the results show that the proposed control method has an important effect to support the frequency stability of micro-grid.