Parallel type excitation device with current feedback and controllable excitation functions

Abstract

The invention provides a parallel type excitation device with current feedback and controllable excitation functions. The parallel type excitation device comprises a regulator and a current transformer. A secondary-side winding of the current transformer is connected with a rectifier bridge, a pin F1 of the regulator is connected with a cathode of a silicon controlled rectifier and a positive end of direct-current output of the rectifier bridge, a pin G of the regulator is connected with a control electrode of the silicon controlled rectifier, a pin N of the regulator is connected with a negative end of the direct-current side output of the rectifier bridge, and a pin V of the regulator is connected with an anode of the silicon controlled rectifier. The parallel type excitation device has the advantages that when the parallel excitation device is used for exciting a power generator, excitation power can be quickly compensated or increased under the condition that an output end of the power generator is in short circuit or terminal voltage of the power generator drops substantially, short-circuit current holding ability is timely provided to the synchronous power generator, a power supply system is selectively protected, the dynamic stability of the power system is guaranteed, and the parallel excitation device is a novel excitation device with high excitation capacity and capability of meeting the requirement on short-circuit current holding ability.

Description

technical field [0001] The invention belongs to the technical field of power generation equipment, and relates to an excitation device of a synchronous generator, which is used for excitation of a synchronous generator, in particular to a current feedback and controllable excitation parallel excitation device. Background technique [0002] Currently commonly used excitation methods and devices for synchronous generators mainly include: separate excitation device, permanent magnet or hybrid excitation device, auxiliary exciter excitation device, third harmonic excitation device, phase compound excitation excitation device and static controllable excitation device, etc. The synchronous generator excitation device should have the required forced excitation capability, that is, when the output terminal of the generator is short-circuited or the terminal voltage drops sharply, the excitation device can quickly compensate or increase the excitation power, realize the selective prot...

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Problems solved by technology

However, the disadvantages of the above-mentioned excitation device are: or there is no self-excitation function; or the motor structure is complicated, the cost is high and there is no automatic voltage regulation function; or the effective material utilization rate of the motor is reduced; or the circuit is complicated and the production efficiency is low; or forced Insufficient excitation capacity

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