Research on rotor stability control during low-voltage traversal of doubly fed machine variable speed phase modulation system
The doubly fed induction generator,operating in electric mode,has a certain inertia supporting capacity to the power grid,but the supporting capacity is limited,and the rotor is out of control during the low-voltage crossing of the power grid.In this paper,a kind of rotor stability control technology is proposed when voltage sags in power system.Firstly,a flywheel is attached to the rotor shaft of a doubly fed fan to increase the inertia of the system and stabilize the speed of the rotor.Secondly,voltage compensation is used to reduce the back electromotive force of the rotor side and stabilize the rotor current when the voltage of the power grid falls,the simulation model of the system is built in MATLAB/Simulink platform,and the results show that the anti-mutation ability of the rotor speed of the doubly-fed fan is improved by 20%by adopting the rotor stability control technology,the rotor current drop value is reduced by 45%,which verifies the validity and reliability of the proposed rotor stability control technique.
DFIGlow voltage ride throughrotor speedrotor current
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