Patent ID: 8853875
Filing Date: 2014-10-07
Classification: F03D,H02J,H02P,Y02E

Abstract:
1. A method for controlling an excitation synchronous generator of a wind power generation system, comprising the following steps: transforming an input wind power of a windmill into an electrical power and outputting to a load, wherein an input of the windmill, the excitation synchronous generator and a motor are integrated on a driving shaft; when the wind power generation system is in a stable state, utilizing a power flow management unit to detect an input power of the motor, and utilizing a power converter with rectification to process the electrical power, so as to store the electrical power in at least one battery set; and when the input wind power varies, performing a motor servo control to stabilize a rotation speed and an output power frequency of the excitation synchronous generator, wherein, during a process of the motor servo control, the electrical power stored in the battery set is provided for a driver through the power converter, and the driver is configured to drive the motor; wherein, when the power of the inputted wind power is sufficient, an output voltage of the excitation synchronous generator is converted into a charge current through converters of the power flow management unit, so as to charge the battery set, and the input power of the motor for controlling the charge of the battery set is obtained according to input voltages and currents of the motor; wherein, the input power is compared with a motor power command, and a compared result is processed by a proportional-integral controller to obtain a signal, and a battery charge power obtained by multiplying a voltage and a charge current of the battery set is fed back and compared with the signal, and another compared result is then processed by the proportional-integral controller to obtain a control signal, and the control signal is processed by a buck gain of the buck converter for controlling the charge of the battery set.