RU143588U1 - PHYSICAL MODEL OF BRUSHLESS EXCITATION SYSTEM - Google Patents

Abstract

A physical model of a brushless excitation system containing a synchronous generator-exciter connected to a synchronous generator through a matching transformer and rectifier, characterized in that the rotor of the generator-exciter, matching transformer and rectifier do not have mechanical coupling with the shaft of the synchronous generator; the alternating current winding of the exciter is located on its stator, and the excitation winding of the exciter is located on its rotor.

Description

Technical field

The utility model relates to the field of modeling electrical systems and can be used to work in a model excitation system consisting of an excitation circuit and an automatic excitation controller.

State of the art

Currently, brushless excitation systems (BSV) are widely used to excite synchronous generators. The use of BSV due to their main advantage - the absence of a sliding contact in the winding circuit of the turbogenerator rotor, allows for the excitation of heavy duty machines. In addition, the use of BSV leads to a significant decrease in the overall dimensions of the excitation equipment. Brushless drive systems are also widely used for low power generators.

The brushless exciter is a synchronous generator of reverse design, the armature of which with an alternating current winding and a diode rectifier is rigidly connected to the rotor of the excited generator. The field winding of the pathogen is located on its stator.

Known synchronous machine [1], taken as a prototype, as the causative agent of which is used brushless multiphase AC machine. The pathogen armature is rigidly connected to the shaft of the synchronous machine, and its winding is connected to the winding of the synchronous machine through solid rectifiers mounted on the shaft of the unit and rotating with it.

Due to the fact that installation of additional elements on a common shaft is not provided for in the design of model power units, it is difficult to create an exact physical model of a brushless excitation system in the case when the synchronous generator-exciter and the main synchronous generator are on the same shaft.

Utility Model Disclosure

The technical result of the utility model is the creation of a model brushless excitation system for testing field excitation regulators, which provides a physical representation of the brushless excitation system that is adequate in terms of dynamic characteristics.

The model of the brushless excitation system contains: a diode synchronous generator-exciter and a main synchronous generator connected by means of a matching transformer and a rectifier. A distinctive feature of the model brushless excitation system is that the exciter generator and the main synchronous generator do not have a common shaft, the synchronous generator is used as the exciter generator, the AC winding of which is located on the stator, and the excitation winding is on the exciter rotor.

Utility Model Implementation

The essence of the utility model is illustrated by the diagram depicted in the figure.

The figure shows a synchronous generator-exciter 1, the excitation winding 2 of the pathogen, matching transformer 3, the rectifier 4, the main synchronous generator 5, the excitation winding 6 of the synchronous generator.

The excitation of the main generator is controlled by controlling the exciter winding current.

In the circuit of the excitation winding 2 of the pathogen, the current is specified by the thyristor (or semiconductor) pathogen 7 or any other type of pathogen.

The thyristor exciter 7 is powered from the network (or generator) through a valve transformer 8.

Thyristor pathogen 7 generates the excitation voltage of the exciter generator 1 U _centuries . This voltage creates such a drive current of the exciter generator I _cc , which provides the necessary current of the field winding 6 of the main synchronous generator 5 and, therefore, the necessary voltage of the main synchronous generator.

Model synchronous generators are used as the synchronous generator-exciter 1, in the nominal mode their linear voltage is selected to be approximately 100 V, so that at high boost ratios set by the controller to increase speed, the stator voltage of the synchronous generator-exciter is limited to the saturation region at the level of 220-240 B. This provides a limitation of the excitation current of the generator at the level of two rated currents.

To obtain the rated current of the field winding 6 of the synchronous generator 5 with a stator voltage of the synchronous generator-exciter 1 equal to 100 V, a matching transformer 3 with a variable transformation coefficient is used to provide the rated excitation current of the generator 5 for generators with different parameters of the field circuit.

The reduced voltage from the matching transformer 3 is rectified by a diode bridge 4, made in the form of a three-phase bridge circuit.

In the BSV model, it is possible to establish a feedback signal for the speed of the main generator to correct the rotation of the pathogen rotor.

Information sources

1. Pat. SU 72177 IPC Classes 7: H02K 19/12 H02K 13/14. Synchronous machine. Publ. 08/03/1959.

Claims (1)

A physical model of a brushless excitation system containing a synchronous generator-exciter connected to a synchronous generator through a matching transformer and rectifier, characterized in that the rotor of the generator-exciter, matching transformer and rectifier do not have mechanical coupling with the shaft of the synchronous generator; the alternating current winding of the exciter is located on its stator, and the excitation winding of the exciter is located on its rotor.