Active frequency controller and method of doubly-fed fan combined with simulated inertia and overspeed
A doubly-fed fan and active frequency technology, applied in the control system, generator control, power oscillation reduction/prevention, etc., can solve the problems of operating point deviation from the maximum power tracking point, secondary drop of grid frequency, limited kinetic energy, etc., to achieve Overcoming the effects of short frequency modulation time and easy machine cut-off, perfect frequency modulation function, and improved system frequency characteristics
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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]
[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]
[0052] In the formula: ΔE is the kinetic energy change of the rotor, ω 1 and ω 2are the rotor speeds before and after frequency modulation, respectively. By adding an additional active power reference value associated with...
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