SU1379912A1 - 12k-phase compensated power supply system - Google Patents

Abstract

The invention relates to the field of electrical engineering and can be used as a converter of alternating current energy into a constant one and vice versa. The purpose of the invention is to reduce the installed capacity and improve the harmonic composition of the input and output currents and voltages. In each pair of converter units there are network windings 3,4 transformers

Description

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mator 1.2 connect}} n according to the schemes that ensure the shift of the secondary phase: voltage of one block of the other unit by another angle / 6K. Its compensating device 1 1 is included in each pair of converters 1 and 1-1x blocks and includes a three-phase equalization reactor with primary semi-windings 12,13,13,16 and secondary windings 14,17 and a capacitor bank 18. Semi-windings 12,13,15 , 16 are connected between the ends of the corresponding vertical windings 5–8 and the inputs of the terminals 9, 10, assembled according to the zero scheme. Since the faults are

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The invention relates to the field of electrical engineering and can be used as a converter of alternating current energy to direct current energy and vice versa with a high MOIUHOCTH factor.

Ilejij) isofoods — reducing the installed MOTORNESS, improving the harmonic composition of the input and output currents and voltages, and ensuring that the BbmpHNtneHHoro system voltage is adjusted.

Figure 1 shows a compensated power supply system for the case of K 1; Fig. 2 shows the connection scheme of two phases of the first reactors and the formation of a negative output terminal of the system with the introduction of additional triples of thyristors, the cathodes of which n 1 are connected to symmetrical spikes from the valve windings of the transformers (spurs aj, b, c, a, ..., c in FIG. I).

The system contains transformers 1 and 2 of the first and second station-phase units, the network windings 3 and 4 of which, respectively, are connected to a star and a triangle, and the valve windings 5 and 6.7 II 8 are connected in direct and on air). The system includes rectifier 9 of the first and such a Kt rectifier 10 of the second sixfold. blocks. The compensation device of the 11 11 system consists of a reactor, the silt of the first part of the magnetic conductor

windings 14 and 17 are shifted by an angle in the capacitor battery 18; current harmonics are multiples of 6p + 1, where n 1,3,5 ... Voltage across the capacitors, transforming into the switching circuits of the rectifier valves 9, 10, cause their artificial switching, which povypat system power factor. - Due to the difference in the connection circuits of windings 3 and 4, current harmonics in the power supply network are multiples, where n 0, /, 4 „„ o, m „e. the spectral composition of the network current corresponds to the twelve-phase system 2 hp

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The first 12 and second 13 three-phase half windings of the first primary winding of the reactor, as well as the first secondary winding 14, are connected to the star, and the first 15 and the second 16 T11-phase half windings of the second primary winding of the reactor are located on the second part of the magnetic core, as well as a triangle in a triangle the second secondary winding 17 of the reactor. A three-phase capacitor bank 18 is connected to the connection points of the windings 14 and 17. (; the system contains two-phase equalization reactors 19. In addition, it may include thyristor triples 20.

The system works as follows.

The valve currents of rectifiers 9 and 10, which flowed through the oppositely connected half-windings 12 and 13, 15 and 16, cause currents in windings 14 and 17, the spectral composition of which contains a harmonic of the order of 6n-1 (n 1,2,3, ... ). By virtue of the phase shift phase-gx, the voltage of the windings 14 and 17 by 30 30 el.grad. in capacitor battery 18, two more odd-multiple harmonics of the current fin-i-l flow (

, -J, J5 ... /

Voltages on capacitors containing the same harmonics, transforming into the switching circuits of rectifier valves 9 and 10, cause their artificial switching, which increases the power factor of the system. Due to the difference in the connection patterns of the net- Bt-rx windings of 3 nA, trlisformatoron 1 and 2, only 1-mrmoniki bpch-1 flow (n 0, 4, 4, ...), i.e. The composition of the network current corresponds to the two-sided system. The voltage control systems of the three thyristor systems 20 and two-phase reactors 19 assembled according to the scheme (Fig. 2) are connected to the tapes fi, b, c, a, ..., from the valve windings S n b, 7 and 8, (; noMoi u.Ki of the impu.L1 system. The output voltage of the thyristor phase control smoothly changes. With this increase in the angle of control, the triplet of the torrents transfer from rectifying to inverter; operation mode-1, which allows maintaining a high ratio of the Licient of the system. At the same time, the system also operates with voltage regulation.

The transition from the bridge circuit of the compensated power supply system to zero with low rectifying voltages reduces the installed power of the valve set twice and boosts the typical power of the transformers.

Claims (3)

Invention Formula , 1. 12K-phase compensated power supply system, containing 2K pest-phase converter units, each of which consists of a transformer with one three-phase mains winding and two three-phase valve windings with connectors connected to them and K compensating devices, including each three-phase reactor with the magnetic conductor divided into two parts, on the first of which the first primary winding is connected and the first winding is connected to a star, and on the second second the primary winding is connected to the second triangle The reactor windings are typical, the first and second secondary windings of the reactor are connected in series in accordance with and a three-phase capacitor battery is connected to their connection points, which, in order to reduce the installed power and improve the harmonic composition of the input and output currents and voltages, the network windings transformers test 50 5 Q five d 0 five The blocks are connected according to the schemes, which ensure that the 1M shift of the secondary phase voltages of one block relative to the other by the angle L / 6K, each of the compensating devices is included in co is the corresponding pair of phase blocks whose secondary phase voltages of transformers are shifted by the angle l / 6, one valve winding of the transformer of each of the six-phase blocks is connected directly, and the other into reverse stars, separated by an additionally introduced two-phase equalizer-reactor, the output from the midpoint of which is connected to one of the output The outputs of the rectifiers of all the blocks are made according to the zero scheme, the conclusions from the united power electrodes of the valves of which are connected to another output terminal, and on each part of the reactor magnetic conductor the primary three-phase winding is divided into two three-phase half windings connected phasewise between the windings of the windings and the valves of the mittel of the corresponding shchestfaznogo block so that one half winding from the side of the valve windings of the transformer is switched on by the initial phase winding, and the other - ends phase poluobmotok. 2. The system according to claim 1, which means that the two-phase equalizing reactors of the phase-switching units are connected between the zero points of the valve windings of the transformers. 3. The pop system, 1, is distinguished by the fact that, in order to ensure smooth control of the rectified voltage of the system at a high power factor, the two-phase equalization reactors of the phase-gage blocks are connected between the same power electrodes of the same type additionally inserted in each block two triples of thyristors, with the free triggers of the power electrodes of the first three thyristors connected to symmetric spikes from the valve winding of the transformer connected in a star, and similar thyristor electrodes second triple taps are connected to the same gate of the transformer winding connected in reverse star.