RU2680374C1 - Shunt reactor-compensator (options) - Google Patents

Abstract

FIELD: electrical engineering.SUBSTANCE: controlled reactor (1) is magnetized by rectifier (3) fed from reactor (1) (from taps or from the compensation winding) through capacitors (2). In this mode, the current and power of the latter are small. In the generation mode, rectifier (3) is shunted with key (6) (1variant), or triplet of thyristors (7) (2variant), or additional bridge (8) (3variant). Reactor (1) works as a transformer or autotransformer, and the rectifier – as a thyristor regulator of current capacitors 2.EFFECT: invention is used in electrical systems.4 cl, 4 dwg

Description

The proposal relates to electrical engineering and is used in electrical systems.

The widely known and used circuit / 1 /, shunt reactor contains power inputs, magnetization windings connected to a thyristor rectifier. The disadvantage of this device is its limited functionality - it is not able to work in the field of reactive power generation.

The prototype of the proposal to all options is a shunt reactor-compensator (hereinafter SRK) 121, containing a controlled reactor with a capacitor withdrawal battery connected to it, connected to the input of a bridge rectifier by the second terminals, the poles of which are connected to the control inputs of the reactor through inductors. The disadvantage of this device is the relatively large energy losses occurring due to the fact that both sources of reactive power (capacitors and reactor) operate simultaneously.

The technical problem solved by this invention is to reduce energy loss.

The problem is solved in the 1st embodiment due to the fact that a key is connected in parallel with the reactor inputs. The problem is solved in the 2nd embodiment due to the fact that the ShRK is equipped with three thyristors, which are connected with the input of the rectifier by the same electrodes, and are connected to the reactor control input by other electrodes, which is connected through the inductor to the inverse pole terminals of the rectifier.

The problem is solved in the 3rd embodiment due to the fact that the ShRK is equipped with a second rectifier bridge connected by the inputs to the first bridge, and the poles of the second bridge are invertedly connected to the control input of the reactor.

Additionally, the problem is solved due to the fact that the ShRK is equipped with a second key, the contacts of which are connected in parallel with the capacitor bank.

In FIG. 1-4 shows the scheme of ShRK, respectively, of the claims. It contains; 1 - magnetization controlled reactor, 2 - capacitor bank, 3 - controlled bridge rectifier, 4, 5 - smoothing inductors, 6 - key contact, 7 - cathode (or possible anode) group of three additional thyristors, 8 - additional (second) rectifier bridge, 9 - three key contacts (inverse with respect to pin 6 of the same key).

ShRK works as follows. In the mode of reactive power consumption, it is a continuously adjustable three-phase inductance and is connected to high-voltage power lines and networks. By changing the direct magnetization current supplied by the rectifier 3 to the windings of the reactor 1, the inductance of the reactor 1, and, consequently, the reactive power consumed by its windings from the network, is changed in a known manner. In this case, the rectifier 3 is powered from the reactor itself in a known manner, for example, from an additional (compensation) winding or from the solderings of the main winding. A capacitor bank 2 of selection is used, the power of which in this mode is negligible. In reactive power generation mode, key 6 is closed and the magnetization current is not supplied to reactor 1. The rectifier bridge 3, being closed at the poles (through the chokes 4 and 5), works as an AC regulator of the capacitor bank 2, and the reactor 1 works as a transformer or autotransformer. A similar mode is provided by the circuit in figure 2 (2nd option) - thyristors 7 are in operation (they were turned off in the consumption mode), forming the cathode group and the anode group of the bridge 3 (its cathode group is closed).

In FIG. 3, both bridges 3 and 8 operate in reactive power generation mode, and only one in consumption mode. In an additional embodiment, contacts 9, a key are used, which close the battery 2 in the consumption mode.

Thus, in both modes (only at full or variable power) only one reactive element works: reactor 1 or battery 2, while the other works in the mode of low load with reactive power: capacitor 2 or reactor 1 (transformer mode or auto). Due to this, reactive power flows inside the ShRK are excluded, and, consequently, energy losses and heating of the elements are reduced. The latter also leads to increased reliability.

Information sources:

1. Patent for utility model of the Russian Federation No. 136919, cl. H01F 29/14, Н02Р 13/00, 07.17.2013.

2. Patent for the invention of the Russian Federation No. 2451353, class. Н01Р 29/14, 27/26, 10.21.2010.

Claims (4)

1. Shunt reactor-compensator, containing a controlled reactor with a capacitor power take-off battery connected to it, with second terminals connected to the input of a bridge rectifier, the poles of which are connected through reactor chokes to the reactor control inputs, characterized in that a key is connected in parallel with the reactor inputs. 2. Shunt reactor-compensator, containing a controlled reactor with a capacitor power take-off battery connected to it, with second terminals connected to the input of the rectifier, the poles of which are connected via reactor chokes to the reactor control inputs, characterized in that it is equipped with three thyristors, which are connected with the same electrodes to the input of the rectifier, and other electrodes are connected to the control input of the reactor, which is connected through the inductor to the inverse pole output of the rectifier. 3. Shunt reactor-compensator, containing a controlled reactor with a capacitor power take-off battery connected to it, with second leads connected to the input of the rectifier, the poles of which are connected via the inductors to the control inputs of the reactor, characterized in that it is equipped with a second rectifier bridge connected by inputs to the first bridge, and the poles of the second bridge are invertedly connected to the control input of the reactor. 4. Shunt reactor-compensator according to any one of paragraphs. 1, 2, 3, characterized in that it is equipped with a second key, the contacts of which are connected in parallel with a capacitor power take-off battery.

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