DEVICE FOR EXCITATION CONTROL OF A SYNCHRONOUS GENERATOR IN AN ALTERNATING CURRENT DISTRIBUTING MAINS Russian patent published in 2023 - IPC H02P9/14 H02K19/36 

FIELD: electrical engineering.

SUBSTANCE: excitation systems for synchronous generators in an alternating current distribution network. The device is equipped with the first controlled key, a threshold element, an additional channel for controlling the excitation current of the synchronous generator, which contains a block for calculating the load angle of the synchronous generator, a fourth subtractor, a damping regulator for oscillations of the rotor of the synchronous generator and a second controlled key. The first controlled key provides a change (expansion) of the excitation current limits of the excitation current controller of the synchronous generator. This makes it possible to increase the stability of its operation in the electric power system, with large disturbances in the system, including the most severe short-term short circuits. The threshold element makes it possible to detect a decrease (“dip”) in the output voltage of a synchronous generator by more than 15% of its nominal value. This changes the excitation control structure of the synchronous generator by connecting an additional channel for regulating the excitation current of the synchronous generator. After the output voltage of the synchronous generator is restored to acceptable values, the additional channel for regulating the excitation current of the synchronous generator is switched off, i.e. the original management structure is restored. These changes in the excitation control structure of the synchronous generator increase the stability of the generator. In the additional channel for controlling the excitation current of the synchronous generator, the load angle of the synchronous generator and its derivative are calculated. The block for calculating the load angle allows to calculate the angle δ both in static and dynamic modes of operation of a synchronous generator, due to which it is possible to ensure timely forcing of excitation, which prevents the generator from falling out of synchronism.

EFFECT: providing damping of electromechanical transient oscillatory processes in a synchronous generator due to disturbing and control actions, as well as mutual oscillations of the rotors of synchronous generators included in the electric power system after large disturbances in the system, including the most severe short circuits.

1 cl, 4 dwg