Controller and method for simulating active power frequency of double-fed induction generator (DFIG) in combination with inertia and over speed
A technology of active frequency, doubly-fed fans, applied in control system, generator control, reducing/preventing power oscillation, etc., can solve the problems of operating point deviation from the maximum power tracking point, rare, limited kinetic energy, etc.
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[0045] The present invention will be further described below in conjunction with the accompanying drawings and embodiments.
[0046] 1. Analysis of inertial frequency regulation and primary frequency regulation of DF IG unit
[0047] 1.1 Rotor kinetic energy control method
[0048] The kinetic energy stored in the rotor of the wind turbine is:
[0049] E = 1 2 Jω 2
[0050] In the formula: J is the moment of inertia of the machine, ω is the speed. The speed adjustment range of the DFIG unit is generally synchronous speed ±0.2pu. By controlling the change of the rotor speed to release or absorb the kinetic energy of the rotor to participate in system frequency modulation, the kinetic energy increment of the rotor before and after the speed change is:
[0051] Δ E = 1 2 J ( ...
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