SU490252A1 - Device for directly controlling phase converter with frequency converter - Google Patents

Description

transformers of both groups, and the midpoints of the primary windings of these transformers are connected to the corresponding horizontal buses of the diode array.

FIG. 1 shows a diagram of the proposed device; in fig. 2, а-ж and 3, а-т - time diagrams of his work.

The device contains a generator of rectification pulses with two outputs and two inputs, a generator of 2 inverter pulses with two outputs and one input, a frequency divider 3, which can be controlled, with two inputs and one output, a six-channel scaler 4 of six cells 5 -10, for example, on thyristors, two transformer groups I and 12, transformers 13-24, forming groups 11 and 12, a diode matrix 25, separation diodes 26-29 in the first windings of transformers, output windings 30-53 transformers, and 30-52 - Weekend about coils with diodes, ensuring the issuance of inverter impulses in the circuit of the thyristors and transformers.

FIG. 2 shows time diagrams, the principle of forming the output three-phase voltage from a single-phase power supply network, with the division factor of frequency divider 3 equal to two, where:

a - pulses on the even and odd outputs of the generator 1 of rectifying pulses;

b - pulses on the even and odd outputs of the generator 2;

c - impulses at the output of frequency divider 3;

g - and - diagrams of the sequence of operation of the cells 5-10 of the counting device 4;

k, l, m - instantaneous values of phase voltages at the output of the converter.

FIG. Table 3 shows timing diagrams explaining the role of the individual thyristors of the converter in the output voltage, where:

a - e - the same as in fig. 2;

g - m - diagrams of instantaneous voltage values that are components of the output phase voltage curves of the converter with reference to the conductivity intervals of individual thyristors.

The proposed device operates as follows.

The rectifier generators 1 and the inverter 2 pulses, being connected to the imitating network, produce pulses with a frequency of 100 Hz. In this case, even pulses are fed to the outputs of these generators, associated with a group of AND output transformers, and odd ones: - to the second outputs of the generators. The phase of the rectifying pulses of the generator 1 can be controlled by the control voltage / cv applied to one input of the generator 1. The phase of the inverter pulses of the generator 2 is constant, and they are formed at the end of the half periods of the supply voltage.

Inverter pulses produced by generator 2 are fed to frequency divider 3, which can be controlled. From the output of the frequency divider, the pulses enter the scaler 4. The frequency of the pulses at the input of the scaler can be 100/6, 100/5, 100/4, 100/3, 100/2 or 100 Hz, and it determines the switching frequency of the cells. 5-10 counters 4.

The distribution of control pulses over the control circuits of the thyristors of the converter is carried out as follows.

Suppose, for example, the initial state of the conductive state is the cell 5 of the counting device 4. The first generated rectifier pulse from the output of the rectifier pulse generator 1 passes through the first windings of those transformers of group 12, the ends of the first windings of which are connected through diodes of the matrix 25 with a cell 5 of the counting device.

The next pulse generated in the device will be an inverter pulse, which from the generator 2 output goes across the second windings of the same transformers, since some of the terminals of the second windings of these transformers are also connected to the corresponding transformers by the horizontal matrix. The transformation of both pulses into the output windings of the above-mentioned transformers is carried out by reversal of the cores over a full cycle by choosing the polarity of the connection of the first and second windings to the outputs of geierators 1 and 2.

In the next half-period of the supply voltage, rectifying and inverting emulsions from the outputs of geierators 1 and 2 will pass respectively through the first and second windings.

those transformers of group 11, the outputs of the first and second windings of which are connected through the diodes of the matrix 25 with the cell 5 of the counting device 4, Immediately after the inverter pulse passes through the second windings of these transformers, the input of the counting device 4 receives a pulse from the output of frequency divider 3. that the second cell 6 of the counting device 4 enters the conductive state, and

Consequently, the control pulses in this case arrive already in the control circuits of another group of thyristors.

Subject invention

A device for direct control of the phase converter with a direct coupling, containing rectifier and inverter pulses with two outputs, a pulse distributor consisting of a recalculating unit and a diode array, the outputs of which are connected to the control circuits of converter gates through two groups of converters, and the entrance through

A frequency divider is associated with two outputs of an inverter pulse generator, characterized in that, in order to increase the efficiency. devices, expanding its functionality and simplification, the first and second outputs of the generators are connected via separating diodes to different ends of the primary windings of the connecting transformers of the first 11 second groups, respectively, and the midpoints of the primary windings of these transformers are connected to the corresponding horizontal buses of the diode array.

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Network, 6 tons

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Network, 5t

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