SU311361A1 - - Google Patents

Description

DEVICE FOR PHASE COMPOUNDING

The invention relates to the regulation of the voltage of synchronous generators, in particular shipboard synchronous shaft generators with self-excitation, supplying a resistive load directly or through a frequency converter.

Devices for phase compounding of self-excited synchronous generators are known, comprising a choke, a rectifying bridge, a compounding transformer and a battery of capacitors connected in parallel with the phases of the winding of the latter.

However, these devices provide, while changing the rotational speed of the generator, insufficient accuracy in voltage maintenance.

In order to increase the accuracy of the voltage of the generator at a variable rotational speed, the proposed device is equipped with an additional transformer. The primary winding of this transformer is connected to the stator phases of the generator, one secondary winding connected to the generator voltage is in series with the windings of each phase of the throttle, and the phases of the other secondary winding of the transformer are connected to the capacitors forming the resonant circuits with the windings of the throttle phases.

The drawing shows a schematic diagram of the proposed device.

It consists of drossel J with an air gap, a compounding transformer with windings 2, 3, 4, a rectifying bridge J. two batteries of heat sinks 6, 7 and a transformer with windings 8, 9, 10.

When the excitation system is connected from the stator of the rotating synchronous generator through the choke / currents flow (due to residual magnetisation of the generator. These currents cause the currents to pass through the windings 2 and 5 of the compounding transformer, through the rectifying bridge 5 and the field winding. The process continues until the volt-ampere the characteristic of the generator excitation circuit will not intersect the generator idling characteristic. The generator will be energized to a voltage that in the range of rotational speed 0.8-1.1 from the nominal voltage differs from the nominal voltage by no more than ± 3%. Reliable generator excitation contributes to the fact that at the lowest rotational speed of the generator (0.8 from the nominal) the equivalent resistance of the throttle / n capacitor battery 6, having an inductive nature, is equal to the capacitance of the battery capacitors 7. At the same time, the generator excitation current does not depend on the magnitude

the input resistance of the rectifying power of the generator excitation winds, i.e., the device & at a rotational speed of 0.8 from the noMjjj 4Sb. Holi acquires the properties of the Bushero circuits. yi i cKopocTb of the generator rotation decreases uiaWra and the input resistance of the self-excitation system due to the fact that the generator frequency approaches the resonant frequency of the series circuit formed by the choke / with an air gap and a capacitor bank 6. In addition, the increase in the capacitor capacitance 7 reduces the bypass of the rectifier input. As a result, as the rotational speed decreases, the generator excitation current increases, and its voltage remains approximately constant.

As the rotational speed increases, the opposite is true. The load current, the passage through the winding 4 of the compounding transformer, causes the main component of the excitation current in the summing winding 3, the passage through the transformer winding 8, the load current causes the additional component of the excitation current in the winding 9 of this transformer, and the passage through winding - in the winding 3 compounding transformer.

The main compounding component of the excitation current almost does not depend on the frequency, and the additional component decreases significantly with increasing frequency as a result of an increase in the shunt effect of capacitor batteries 6 connected to the transformer winding 10 and an increase in the resistance of throttles ./. As a result, the total compounded current component of the excitation current decreases with increasing frequency.

the law of variation of the compounding component is close to the corresponding characteristic of the generator. The magnitude of the total component of the ND1Speakable component of the excitation current is proportional to the current of the Aruzk I, and the phase, when purely act, in the “generator load”, is 90 ° ahead of the phase of the component of the excitation current.

That "they way," ak When. Course,

so; and the LABOR. with the load characteristics (the proposed device is sufficiently approached to the adjusting characteristics of the generator, ensuring the accuracy of the engine support of the generator, determined by the loop of the piston 31is (± 3%), i.e. the same Komt.au dirovayi ordinary ship generators constant speed In | rascheni.

Subject and d on e.

The device for phase compuhvrovaya of synchronous generators with self-excitation, containing one choke, 1 output generator

A bridge, a computation transformer and capacitor banks connected in parallel with the phases of the windings of the voltage of the latter, characterized in that, in order to increase the accuracy of maintaining the voltage of the generator

at a variable rotational speed, it is equipped with an additional traiformator, the primary winding of which is included in the stator reH-eipATOpa phases, one; the second winding connected to the generator voltage, -

in series with the windings of each phase of the throttles, and capacitors are connected to the phases of the other secondary winding, forming not the windings of the phases of the drossel resonant circuits ... -. . „