Device and method for low voltage ride through of double-fed inductive wind power generator system
A technology of wind power generator and low voltage ride through, which is applied in the direction of wind power generation, generator control, control system, etc., to achieve the effect of suppressing impact, reducing transient impact, and assisting safety, stability and recovery
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[0089] In the following, the control effect analysis of the present invention is carried out with the research of a 1.5MW commercial doubly-fed induction wind generator. The rated voltage of the motor stator is 690V, and the rated DC bus voltage is 1050V. Before the grid failure, DFIG was running at rated power at a speed of 1800 rpm (1.2 pu), the active power from the stator was 0.84 pu (the total active power from the system is 1 pu), and the reactive power is 0. When it runs to 0.3s, the grid voltage drops to 15% for 300ms.
[0090] by Figure 4-Figure 10 It can be seen that the use of the low voltage ride-through method of the present invention can control the peak value of the stator and rotor current within the range of twice the rated peak current, and the electromagnetic torque ripple is small, the DC bus voltage fluctuation is small, and it is within the safe range. And it can quickly restore the given value, it can be seen that the electromagnetic shock...
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