Non-stop variable speed constant frequency power generation system at fault

The present invention discloses a non-stop variable speed constant frequency power generation system at a fault. The non-stop variable speed constant frequency power generation system at the fault comprises a switch switching unit, a conductor, an AC bus, a DC bus, a grid-side converter, a machine-side converter, a grid-side filtering module, a machine-side filtering module, a measurement control system, a transformer substation system and a power generation system. According to the present invention, a faulted part is resected by the switching of a switch when the grid-side or machine-side converter or a unit power and power generation part goes wrong, and other converters in the system are utilized to carry out the power exchange or to provide the current transform for other units, thereby realizing the non-stop overhaul of the faulted unit, being able to reduce the harmonic injection to a power grid, reducing the influence of the power generation equipment output electric energy to the power grid, and improving the electric energy quality of a power plant and the operation stability and economy of the power grid.