SU736352A1 - Device for pulse-phase control of m-phase thyristorized converter - Google Patents

Description

37

1 a1Cp is 1pc of this phase, and the output is connected to 1lin 2; 2 resets the pulse counter and to the first input of the element {that is, the second input of which is connected to the output of the controlled generator of pulses common to all channels, and the third input of the I-element to the output of the impulse counter whose input is connected to the output of the element I, the null organ has a second input that is connected to the first input of the null organ of the next channel.

FIG. 1 shows the structure of the proposed device; in FIG. 2, timing diagrams.

The device consists of m-channels

control, containing null-bodies 1 "of which are connected to implement (E5G synchronization of each work to the analog to the corresponding phase of the circuits And 2 whose outputs are connected to the inputs

counters 3 with reset fault and a common for all channels controlled oscillator and 1 pulses 4 with linear characteristic input-output,

The outputs of the null-orgagyuv 1 are connected with the corresponding circuits AND 2 and reset buses 4 counters 3. The outputs of the counters 3 are connected to the inputs of the corresponding circuits AND 2. The output of the controller in the vlg generator 4 is connected to all

schemes And 2.

When the input of the zero organ 1 passes over, a zero signal is sent through zero to the reset meter bus 3. Thus, the counter 3 returns to its original state. At the same time, a signal is sent from the null organ 1 to the AND 2 circuit, which prevents the shlpuls from the generator 4 from being sent to the input of the counter 3 to the next transition of the input signal

rez zero.

The pulses arriving at the input of the counter 3 from generator 4, when the input signal of the nullorgan 1 is set, fill the counter 3. When the counter 3 is filled, its output signal is fed to the input of the AND 2 circuit, which prevents the receipt of pulses from the generator 4. Counter 3 remains full until the input signal of the null organ passes through zero, which returns to the initial state.

Thus, the duration of the presence of the output signal of the device is the difference between half the period of the phase signal and the valid angle of the regstregs. The magnitude of the shift is determined by the time it takes for the n to counter 3, which depends

S24

from the frequency В1,1 of the generator sigtal 4.

The frequency of the 4-hop oscillator 4 is directly proportional to the voltage of the controller supplied to its input and changes without inertia as the control voltage changes.

In order to obtain a range of variation of the regulation angle equal to one half-period of the supply network, the range of variation of the frequency of the generator 4 should tend to infinity. The implementation of such a converter is impossible. Therefore, for the purpose of decreasing the frequency range of the oscillator 4, the signal at the zero-organ input has a duration longer than the range of the control angle and is of a leading nature with respect to the time corresponding to the zero control angle. This is achieved by connecting a sinusoidal phase voltage to the input of the null organs 1, in which the control is advanced and the phases are ahead of the latter, i.e., the second input of each null organ is connected to the first null organ input of the subsequent channel.

The frequency range of the conversion

h “1G

in this case the caller is: K -, -

and has a final change, for example, for phase A with additional synchronization from phase B {ahead of phase A by)

60 + ISO

K 4.

60

Claims (2)

Invention Formula A device for pulse-phase control of a t-phase thyristor converter, containing in each channel a null-organ, the first input of which is connected to the corresponding phase, the output of the null-organ is connected to the reset bus of the pulse counter, the element I, the first input of which is connected to the output of the common for all channels of the controlled pulse generator, the second input of the AND element is connected to the output of the pulse counter, the input of which is connected to the output of the AND element, characterized in that, in order to reduce the range, the frequency of the controlled the go of the pulse generator, the second input of the nullorgan is connected to the first input of the nullorgan of the next channel, and c) 1 input gul57363526 organ connected to the third entrance of the ele-1. USSR author's certificate ment I.№ 436429, MKI H 02 R 13/16, 1969. Source information, for application number 2465842, MKI H 02 p taken into account in the examination 2. USSR author's certificate 13/16, 1977.