Patent ID: 8432055
Filing Date: 2013-04-30
Classification: F03D,H02J,H02P,Y02E

Abstract:
1. A wind turbine connected to a power grid, the wind turbine selectively activated to operate at a high-voltage ride through (HVRT) mode, the wind turbine comprising: a grid voltage circuit for monitoring a fundamental voltage of the power grid and activating the HVRT mode if the fundamental voltage is at least about equal to a threshold voltage value; a DC bus having a DC bus voltage; a voltage source providing a DC bus rated voltage; a dynamic brake having a brake chopper and a resistive element, the dynamic brake connected to the DC bus, and the dynamic brake connected to the voltage source if the HVRT mode is activated, the brake chopper regulating the DC bus voltage by connecting the resistive element to the DC bus if the DC bus voltage is at least about equal to the DC bus rated voltage; a grid side converter and a generator side converter, the DC bus coupling the grid side converter with the generator side converter; and a mode switching element in communication with the grid voltage circuit and selectively connected to a six-step modulator, the mode switching element connecting the grid side converter to the six-step modulator if the HVRT mode is activated.