SU141213A1 - Multi-phase deep-regulated ion converter with unequal phase voltages - Google Patents

Description

Multiphase deep-regulated ion converters with unequal phase voltages are known.

A distinctive feature of the proposed device is that it is composed of two-phase converter cells, the control valves of which are connected to the winding of a supply transformer with a lower phase voltage, and uncontrollable to a winding with a large phase voltage. Cells belonging to the same phase of the device are switched on via an equalization reactor.

The proposed device allows a higher efficiency factor to be obtained. with deep regulation.

Asymmetrical grid control of the valves can be applied to regulate the rectified voltage, which increases the power factor with deep regulation

FIG. 1 is a schematic diagram of a multi-phase converter; in fig. 2 - forms of rectified voltages.

The ionic deep-regulated converter consists of two groups of valves (controlled and uncontrolled), a rectifying transformer and equalizing reactors UR-1,. . ., UR-4.

The secondary windings of the rectifying transformer are powered by controlled and uncontrolled valves, and controlled valves (fii3, 14, 23, -624, -Sss, -634) are connected to windings with a lower phase voltage, and uncontrolled ( , Bi2, 621, Sog, S: 5i, Bq2) - to windings with large phase voltages. The midpoints of the phase windings through the windings of the balancing reactors UR-},. . . The UR-4 is connected to the load I.

During the operation of this phase, valves will be conducted that are in different steam groups of this phase and having the same phase but with different voltages. Phase equalizing reaction № 141213

The torus equalizes these voltages, since each coil of the phase surge reactor is connected by valves alternately to a greater and a lower anode voltage, in this case a variable magnetic flux occurs in the cores of the reactors.

With the help of the balancing reactors UR-1, UR-2, UR-3, two three-phase symmetric groups are equipped, the voltages of which are shifted in phase by 180 ° el. and are fed to the general equalizing reaction of the UR-4.

FIG. 2 (a) shows the shape of the output voltage L / BI of the first three-phase group at a control angle equal to zero.

FIG. 2 (6) and 2 (s) show the forms of the output voltage of the first Uei and the second L82 of the three-phase groups, respectively, at the angle of regulation of the voltage a in FIG. 2 (d) is a curve of the output voltage U (-j on the load.

A change in the control angle of the controlled dewatering valves, changes the output voltage of the multiphase converter from the maximum value to zero, since with the closed controlled valves the phase balancing reactors turn into alternating current chokes and the voltage on the load is zero.

The load current of the converter passes through parallel connected (ionic) and uncontrolled (semiconductor) valves, so that the average drop will be equal to half the sum of the voltage drops in the ion and semiconductor valves.

With an increase in the ignition angle of the ion valves, an increasing proportion of the load current passes through the semiconductor valves and the average voltage drop in the valves decreases.

Thus, the proposed converter has a lower average voltage drop in the valves, which increases the efficiency of the installation.

The presence of uncontrolled valves increases the average value of the power factor of the converter over the entire range of output voltage variation. The average value of the power factor of the converter can be further increased by using asymmetrical grid control of ion gates.

Subject invention

Claims (2)

1. Multiphase deep-regulated ion converter with unequal phase transitions, characterized in that, in order to obtain a higher efficiency with deep regulation, it is composed of two-phase converter cells, each of which consists of two parallel operating valves controlled and uncontrolled, of which the first is connected to the winding of the supply transformer with a lower phase voltage, and the other to the winding with a large phase voltage, and the indicated cells relating to with to one phase converter, connected to the load through the group windings of the equalization reactor. 2. A device according to claim I, characterized in that, in order to obtain a high value of the power factor with deep control in the control of the valves, asymmetrical grid control is applied.