SU570181A1 - Device for control of frequency converter - Google Patents

Description

The meter, the connected input to the disjunctor, and the output to the decoder are additionally equipped with two controllable frequency dividers, and the controllable frequency amps are included in both channels of the frequency ampli fi er between the master oscillator and the unmanaged frequency dividers The control of the wedge inputs of the controlled frequency dividers is connected to the outputs of the remote controller, and the switch is connected to the outputs of the controlled frequency dividers. FIG. 1 was completed with the scheme of transforming its device; in fig. 2 is a schematic diagram of the device for controlling the converter h; that is in FIG. 3 timing diagrams of the operation of individual units of the device To control the frequency converter. Transform; the device contains inverters 1 and 2, transformers 3 and 4, power thyristors 5-8, load 9. The device for controlling frequency converters contains, in turn, a master oscillator 1O, controlled frequency dividers 11 and 12, unmanaged co-drivers, dividers: frequencies 13 and 14, DISCONNECTOR 15, .differential counter 16, deflector 17, driver 18 for control signals of inverter 1 thyristors, driver for control inverter thyristors 2, generator 19, driver 20 for control signals of reverse bridge thyristors 5-8. FIG. 2 shows I: a - impulses of master oscillator 10, b - impulses of controlled divider llf b - impulses of controllable divider 12, g - pulses 1 of disjunctor 15, 3,, 3, and - impulses of five-phase counter 16, k, A, m - pulses of the decoder 17, Vi -. impulses of loading 9; and 11 is the form of the average value of the load voltage 9 with sections A, B, C of different division ratio of the controlled dividers 11 and 12. The device works as follows. The pulses from the master oscillator 10 are fed into two frequency division channels by the controlled dividers li and 12, { impulses from the output of coachers syoTeStejnS come to disjunctor 15 and y the corresponding final frequency dividers 13 M 14. From the output of the disjunctor 15, the differential frequency pulses go to p tirar d1p 1st counter 16, from the first sections of which the pulses e, g, g 3 to They are connected to a decoder 17 in which a switch code (see Fig. 2) is produced, k, A, m) of the division factor of the controlled divider 11 and 12. Since the slope of the direct modulation law of the pulmonary output voltage of the converter is determined by the frequency difference first and second 1 1 dividing line, then, in order to obtain qua ai sinusyudshuyu building voltage (see Fig, 2, i) it is necessary on the plot A to choose such nakpon pszgroenii function, so that this right intersects the svetoplakupnuyu building function when gripping it avnom 0.5A ... At the station B and C coefficients contrast dividers 11 and 12 is selected correspondingly smaller. P (x: dividing the frequency in the final dividers 13 and 14, the pulses of each channel i of the division are fed to the formers 18 and 19 of the thyristor control pulses, and each inverter channel controls its own inverter. The control of the reversible rectifier bridge 5, 8 is on the output of the converter is carried out through the pulse shaper 20, which is supplied with impregnations U from the fifth digit of the counter 16. The considered principle of changing the ratio of the division factor synchronized with the output voltage period can be set It is the basis for building a control unit for a single-phase inverter 6. .holia & HbiM control. If a thyristor is used: ikbfi: ikbfi bridge inverter dtr yrtjjaRlifltb: the name of the pbribr and the second channel of division and source | ; If the bridge rack controls the difference sequence of impulses in the first and second division channels, then we get unipolar pulse-like voltage in the load. Introducing new elements into the control device — controlled frequency dividers synchronously switched during each half-period and the output pulse-width Vf ro voltage, a converter built on two inverters, or on a single inverter with phase switching, practically reduces to zero not only the third and multiple harmonics in the output voltage of the converter, but also all nearby harmonics .., Ф o p ″ 4 in. of the invention. A device for controlling a frequency converter on two inverters with a single-pole 5 W1-lTNO-pulsed MO-output voltage, containing a master oscillator connected to two

Channels of frequency deposition on uncontrolled frequency dividers connected to the input of the thyristor control pulse formers, a counter connected to the INPUT; to the disjunctor, and Bbixci to the decoder, which is additionally equipped with a two-way switch to increase the efficiency of the converter. dividers k1 and frequencies, and controlled frequency dividers are included in both channels of frequency division between the master oscillator and unmanaged frequency dividers, the control inputs are controlled frequency dividers connected to the outputs of the decoder, and is connected to dizkzhktor viyudam actuated frequency dividers.

Sources of information, taken into account in the examination:

1. USSR author's certificate number 516170, cl. H 02 R 13/16, 1b74.

2. USSR author's certificate number 515242, cl. H O2P 13/16, 1971.

3. USSR author's certificate number 349О73, cl. H O2 P 13/18, 19-j.

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