Distributed Generation of one kind of Networking Mode and the Power Relations Analysis between Large AC Power Grid and Distributed Generation Grid

For the problems of distributed generation new energy connecting to the grid, a networking mode with dual PWM DC / AC power supply interface is proposed, This mode can achieve a large grid and micro-grid communication partitions, The operation and management of distributed power generation system is more flexibility, Control strategy is more richer,and the AC micro-grid electricity users is more secure. Analysised from the DC bus into the large micro-mesh grid side equivalent model, three control modes is presented to Grid Interface DC / AC : Charging, discharging mode and synchronous condenser mode, And at the three modes, the power relations is analysised between large grid and DG grid .