SU1099313A1 - Power regulator - Google Patents

Abstract

A POWER CONTROLLER containing three chains, each of which consists of series-connected load sections and a thyristor switch, and the chains are connected in a triangle, the vertices of which are connected to the leads for connecting a three-phase mains supply, characterized in that in order to increase the power factor with increasing adjustment range, three additional loading sections are introduced, connected in delta, each of whose two vertices is connected through one of the additionally introduced key elements common point compound sekidii basic load and the thyristor switch one of the two chains, and a third vertex is connected to the common point of the compound main load section and r third thyristor key chain itself. o; o: o: o

Description

The invention relates to industrial electric power engineering and can be used to regulate power on a multi-compartment load, for example, active and induction heaters.

Known power controllers are made on thyristor switches and operate on the principle of switching the load coupling circuit L.

However, such controllers contain a large number of thyristor switches and do not provide a high power factor in a wide range of control.

Closest to the present invention is a power regulator containing three chains, each of which consists of series-connected load sections and a thyristor key, with the zedochki connected in a triangle, the vertices of which are connected to the leads for connecting a three-phase mains supply 2j.

The disadvantage of this regulator is the impossibility of providing a high power factor in a large control range.

The purpose of the invention is to increase the power factor while increasing the control range.

The goal is achieved by the fact that a power regulator containing three chains, each of which consists of serially connected load sections and a thyristor switch and the chains are connected in a triangle, the vertices of which are connected to the leads for connecting a three-phase power supply network, three additional load sections are connected, connected into a triangle, each of the two vertices of which is connected to one common point of connection of the main section through one of the two additionally introduced key elements and the thyristor the first key of one of the two chains, and a third vertex is connected to the common point of the compound main load section and the third thyristor key chain itself.

FIG. 1 shows a power control circuit; in fig. 2 is a diagram of the connection of additional load sections.

The power regulator contains sections 1-3 of the load, thyristor keys

4-6, each of which contains two parallel-opposite thyristors 7 and 8. The common points 9-11 of the connection of the thyristor switches 4-6 and, respectively, of the load sections 1-3 are connected, respectively, pins 12 and 13 of the injected contactor (key element) and one from the vertices (rays) of the triangle (star) of additional input load 14, which consists of additional sections 15-17. 2, sections 15-17 of the load are connected into a star.

The power regulator operates as follows.

With open keys 4-6 and closed contacts 12 and 13, the total load consumes power S by

/ Z,

and

phase supply voltage

Where

F network;

the total impedance of one element (section) of the load (any of 1, 2, 3, 15, 16, 17). With public keys 4-6 and open contacts 12 and 13

.

With private keys 4-6 and closed contacts 12 and 13

5 (9/4). ; With contacts 12 and 13 closed and

with open thyristors 7 (8) keys 4-6 (with a purely resistive load) while maintaining the sinusoidality of the linear currents

, 5u5 / 2.

Thus, the power factor of the regulator is one for the following values and x relative power consumption of the load 3: 0.125 0.23; 0.5; 1. At intermediate points of the regulation characteristic, the power factor is correspondingly higher than in the prototype. This suggests that the range of voltage regulation of a multi-compartment load with a high value of power factor is significantly expanded compared with the known devices (8: 1 instead of 3: 1) and, in turn, the power factor is increased with a large range of regulation, which is significantly expanded em device functionality.

2

Claims (1)

A POWER REGULATOR comprising three chains, each of which consists of series-connected load sections and a thyristor switch, the chains being connected in a triangle, the vertices of which are connected to the terminals for connecting a three-phase supply network, characterized in that, in order to increase the power factor with increasing control range, introduced three additional load sections connected in a triangle, each of the two vertices of which through one of the additionally entered key elements connected to the common connection point of the load section and the main thyristor key u9 one of these two chains, while the third vertex is connected to the common connection point of the primary load section and the third thyristor key chain itself.