Control method of grid connected wind turbine

The invention relates to a control method of a grid connected wind turbine. An impeller of the grid connected wind turbine captures wind energy, converts the wind energy into mechanical energy, and transmits the mechanical energy to a power generator, and the power generator outputs power to a power...

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Bibliographische Detailangaben
Hauptverfasser:	TU LE, DING JINZHONG, SHI MAOSHUN, LI WEI, LIN YONGGANG, LIU HONGWEI
Format:	Patent
Sprache:	eng
Schlagworte:	BLASTING HEATING LIGHTING MACHINES OR ENGINES FOR LIQUIDS MECHANICAL ENGINEERING OR A REACTIVE PROPULSIVE THRUST, NOT OTHERWISE PROVIDED FOR PRODUCING MECHANICAL POWER WEAPONS WIND MOTORS WIND, SPRING WEIGHT AND MISCELLANEOUS MOTORS
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Beschreibung
Zusammenfassung:	The invention relates to a control method of a grid connected wind turbine. An impeller of the grid connected wind turbine captures wind energy, converts the wind energy into mechanical energy, and transmits the mechanical energy to a power generator, and the power generator outputs power to a power grid. Before grid connection of the power generator, a controller adjusts the discharge volume of a volume-adjustable hydraulic pump to the maximum value a, adjusts the discharge volume of a volume-adjustable hydraulic motor, and controls the rotation speed of the power generator to reach a grid-connection rotation speed. After grid connection of the power generator, when the controller detects that the wind speed rises, the controller adjusts the discharge volume of the volume-adjustable hydraulic pump to zero, and adjusts the discharge volume of the volume-adjustable hydraulic motor, so that the rotation speed of the impeller reaches the best rotation speed, and the maximum power tracking control is controlled. When the controller detects that the wind speed decreases, the controller adjusts the discharge volume of the volume-adjustable hydraulic motor to zero, and adjusts the discharge volume of the volume-adjustable hydraulic pump, so that the rotation speed of the impeller reaches the best rotation speed, and the maximum power tracking control is achieved. The control method of the grid connected wind turbine can not only efficiently transmit energy, but also relieve the torque ripple of a transmission system, improves the energy utilization rate, and meanwhile lowers the fault rate of the transmission system.