SU1497691A1 - Logic switching device for control of reversible thyratron converter - Google Patents

Abstract

The invention relates to electrical engineering. The purpose of the invention is to increase reliability - due to the fact that in the logical switching device, which is part of a reversible two-set gate converter with a pulse-phase control system common to both sets, the current-free pause is redistributed when the converter is reversed between the delay elements included at the output of the first memory element, and the newly introduced additional delay elements installed at the output of the second memory element, in connection with which transducer switching reversible complexes with the control angle that eliminates inrush current. 2 Il.

Description

The invention relates to electrical engineering and can be used in control systems for reversing valve converters with separate control of valve groups.

The purpose of the invention is to increase reliability.

Figure 1 shows the functional diagram of the device; 2 is an explanatory timeline,

Logical switching device for controlling a reversible valve converter with two sets of valves 1 and 2 and a pulse-phase control system 3 common to both sets with a sinusoidal reference voltage source, a two-pole bias signal source and a reference signal source containing two null indicators D and 5 diagrams sources 6 and 7 of the input signals of the reverse and current, respectively, the direct and inverse outputs of the first and the direct output of the second of which are combined in pairs through two input elements and AND 8 and 9, the outputs of which are connected to the inputs of the first memory element 10, the direct and inverse outputs of which are directly connected to the first inputs of the two output elements 11 and 12 and through

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the first 13 and second 14 delay elements - to the inputs of the second memory element 15, the direct and inverse outputs of which through additional elements, 16 and 17 delays are connected to the second inputs of output elements 11 and 12, whose outputs are connected to the switching inputs of the control system 3 , the input of the reverse of the source of the signal of the displacement of which is connected to one of the outputs of the second memory element 15

Logical switching device operates as follows.

When there is a command (Up, FIG. 2) 15 for switching, the first memory element 10 first changes its state (U, FIG. 2), which prohibits the passage of pulses in the previously working 1

this set of valves 1 or 2 (U figure 2). From this point in time, a pause begins to occur when switching t in one of the first delay elements 13 and 14. When t expires, the second element changes state

memory 15 (Uy, j, Fig. 2). This leads to the formation of a signal for switching the polarity of the bias voltage in control system 3 and to the origin of the time delay t in one of the additional delay elements 16 or 17, after which breaking the signal to pass control pulses to the newly activated set of valves 1 or 2 (and, Fig. 2). The minimum required time delay t is determined from the expression

.

where dd arcsin (nc, / uon) is the displacement of the initial control angle X y due to the effect of the bias voltage;

ii) - circular frequency of the mains.

This ensures the inclusion of a transducer with a control angle, i.e. with an angle that excludes inrush current. If during the reference time t the first memory element returns to its former state, which may occur when the reverse command is removed, the re-activation of the previously working set will also occur at angles o (y, since the polarity of the bias voltage does not change las.

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40

45

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It should be noted that the total pause when switching the reverse sets (t,) does not increase, but only redistributes between the previously established output, the links in the delay elements 8 and 9, and the additional delay elements 16, 17, Tov th t 1 + tj.

Thus, by eliminating the possibility of switching or re-activating sets of reversible converter valves with control angles less than d (y, current surges are eliminated and the overall performance of the converter increases.

Formula of the invention

A logical switching device for controlling a reversible valve converter having a pulse-phase control system common to two sets of valves with a sinusoidal reference voltage source, a two-pole bias source signal and a reference signal source l containing two zero. indicator of the reverse and current input signals, respectively, the direct and inverse outputs of the first and the direct output of the second of which are combined in pairs through two input elements AND, the outputs of which are connected to the inputs of the first memory element, the direct and inverse yykhody through the first and second elements delays are connected to the inputs of the second memory element and directly to the first inputs of two output elements Hj whose codes are designed to be connected to the switching inputs of the km-pulsed-phase control system, about tl. therefore, in order to maintain reliability, it is equipped with two additional delay elements, the outputs of which are connected to the second inputs of the output elements And ,. and the inputs to the direct and inverse outputs of the second memory element, respectively, one of which is also intended to be connected to the input of the reverse of the source of the bias signal of the pulse-phase control system.

Claims (1)

Claim The logical switching device starts to count the pause when switching t, in one of the first delay elements 13 and 14. When t expires, the state of the second memory element 15 changes (U _T1S , Fig. 2). This leads to the formation of a signal for switching the polarity of the bias voltage in in to control a reversible valve converter · having a pulse-phase control system common to two sets of valves with a sinusoidal reference voltage source, a bipolar source of the bias signal and a source x of the control system 3 and to the beginning of the time delay Ц in one of the additional delay elements 16 or 17, after which enable signal is formed for the passage of the control pulses to the newly includes a set of valves 1 or 2 (U _n, 2). The minimum required time delay t is determined from the expression where ad = arcsin (U _CM / U _{0Г |} ) is the displacement of the initial control angle X due to the action of the bias voltage; and? - the circular frequency of the supply network. In this case, the inclusion of a converter with a control angle oijf, i.e. with an angle excluding inrush current. If, during the counting t, the first memory element returns to the previous ^ reference signal, containing two zero indicators of the input signals of reverse and current, respectively, the direct and inverse outputs of the first and direct outputs of the second of which are combined in pairs through two input elements And, 35 outputs of which are connected to the inputs of the first memory element, direct and inverse outputs of which through the first and second delay elements are connected to the inputs of the second memory element 40 and directly to the first inputs of the two output elements And; the outputs of which are intended to be connected to the switching inputs of a pulse-phase control system, aphid 45, which, in order to increase reliability, is equipped with two additional delay elements, the outputs of which are connected to the second inputs of the output elements And,. and the inputs are in a direct and inverse state, which may occur when the reverse command is removed, then the previously switched kit will also be switched on at angles since the polarity of the bias voltage did not change. the moves of the second memory element, respectively, one of which is also designed to connect to the reverse input of the source of the offset signal 55 of the pulse-phase control system. Soybean agent V. Zhmurov