SU864263A1 - Device for regulating three-phase voltage - Google Patents

Description

(54) DEVICE FOR REGULATING THREE-PHASE VOLTAGE

I

The invention relates to electrophehHKe, in particular to converter equipment, and can be used to regulate or stabilize the voltage on a load.

Closest to the present invention is a device for regulating a three-phase voltage, comprising a transformer with an auxiliary and two main windings, one terminals of which are connected to the input and output outputs of the device, while others are connected to a valve control unit consisting of two bridge converters connected between each other are direct current outputs, the first of which is made on valves with double-sided or one-sided conductivity, and the second on valves with one-sided conductivity l J.

The disadvantage of this device when powering the load from an individual transform; 1mount is the need

have two transformers, power and booster, which increases the weight and size parameters and the cost of the device as a whole.

The purpose of the invention is to improve the weight and dimensions of the device.

The goal is achieved by the fact that the other terminals of the auxiliary and one main windings are connected to the AC terminals of the second and first converters, respectively.

The drawing shows a functional diagram of the device.

The device contains a transformer

(5 1, basic 2, 3 and auxiliary

4 winding transformer 1, first

5 and the second 6 bridge converters, input 7-9 and output 10-12 pins.

M

The device works as follows.

Claims (1)

Suppose that the supply voltage is applied to the terminals 7-9 of the device, and the load is connected to the terminals 10-12. In accordance with this, hank 2 is primary, and winding 3 is secondary. When switching the valves of converter 5 at the outputs X, Y and 2, a square-step voltage is generated, the amplitude of which is determined by the value of the voltage in the DC circuit regulated by converter 6. Since converter 5 and AC winding are turned on In the load circuit, a voltage equal to the geometric sum of the voltage of the winding 3 of the converter 5 is created at the terminals 10-12. Change the latter in magnitude or phase by acting on the angles of unlocking the converter valves 5 and 6, it is possible to adjust the load voltage. Due to the reversibility of the device, the supply voltage can be connected to terminals 1012, and the load is connected to terminals 7-9. In this case, the winding 3 will be primary, and the winding 2 will be secondary. The adjustment process in this case is not measured. In the particular case when the voltage levels of the network and the load are commensurate, and when electrical separation of these voltages is not required, an autotransformer can be used instead of the power transformer. In this case, transducer 2 is turned on at the open zero point of the common winding part. The internal wiring diagrams of the terminals of the auxiliary winding 4 and one of the main windings that are not connected to the converter 5 are not significant and can be made in the form of a star and a triangle. Claims An apparatus for controlling a three-phase voltage comprising a transformer with an auxiliary and two main windings, one terminals of which are connected to the input and output terminals of the device, respectively, and the other terminals are connected to a valve control unit consisting of two bridge converters interconnected DC power supplies, the first of which is made on valves with double-sided or one-sided conductivity, and the second one on valves with one-sided conductivity, o It is distinguished by the fact that, in order to improve the weight and size parameters, the other terminals of the auxiliary and one main windings are connected to the AC terminals of the second and first converters, respectively. Sources of information taken into account in the examination 1. USSR author's certificate in application No. 2341861 / 24-07, cl. G 05 F 1/24, 1976.