A method trigeneration system and grid network solitary seamless switching mode

Methods trigeneration system and grid network solitary seamless handover mode of the present disclosure, the isolated network mode to grid mode synchronization device comprises a mode switching function added; trigeneration mode control isolated network receives the mode switch request command to the grid pattern and the grid is operating normally, starting synchronization device, adjusting the generator frequency and voltage; and a voltage generator frequency grid period satisfying the requirements of the grid voltage phase difference and the absolute value of the generator value less than 1, the output mode is switched to the isolated grid network mode operation command; FM regulator supplied by the mode controller to control the conversion power control; the generator voltage and frequency to meet the requirements of the grid period and the absolute phase generator from the grid value smaller than 2, the output of the generator and grid instruction; isolated network mode is switched from the grid pattern; solve the need to stop the generator output power during a power failure causes a switch and trigeneration process disturbance in the system mode is too large And other issues.