The Improved Control Strategy of Inverters Output Power Equipartition in Micro Grid

The output power of inverters should be precise equipartition in micro grid, because that is the basic conditions that the micro grid system works stably for a long time. This paper proposes a improved control strategy of inverters output power equipartition in micro grid based on virtual impedance method. Firstly, the output power equipartition conditions of inverters based on the droop control method are analyzed, and a measurement method of micro grid line impedance based on clock synchronization and Micro Grid Central Controller(MGCC) coordinated control is presented. Secondly the output power ability of inverters, the active and reactive power decoupling ability, the system dynamic property and stability are served as the conditions of virtual impedance designed, therefore the optimal design method of virtual impedance values is proposed. The system simulation model was set up in MATLAB, and the simulation experiment results show that the proposed method has the effectiveness and practicability.