SU1667210A1 - Single channel device for control over three-phase converter - Google Patents

Abstract

The invention relates to converter technology, in particular, control systems for valve converters connected to a three-phase network. The aim of the invention is to ensure operability in both forward and reverse phase mains voltage phases. The device contains the first 2 and second 5 RS-flip-flops and JK-flip-flop 7. The S-inputs of the flip-flops 2 and 5 are connected to sensors 1 and 4 transitions from the positive half-wave to the negative phases B and C, respectively, and the R-inputs are connected to the sensors 3 and 6 transitions from the negative to the positive half-wave. The J inputs and K inputs of trigger 7 are connected to the forward outputs of triggers 2 and 5, and the C input is connected to the output of phase 8 sensor A. The voltage phase sequence sensor is trigger 7, the output of which is connected to the input of the distributor 9 pulses controlling the sequence of switchings of the converter valves. 2 Il.

Description

The invention relates to converter technology and can be found using control systems for valve converters connected to a three-phase network.

The aim of the invention is to ensure the operability of the device in both direct and inverse phase sequence network voltages.

Fig. 1 shows a functional diagram of a single-channel device for controlling a three-phase converter; figure 2 - timing diagrams illustrating the operation of the device.

A device for controlling a three-phase converter comprises a phase voltage transition sensor 1 from positive

half-wave to negative, the output of which is connected to the 5th input of the RS flip-flop 2, R- the input of which is connected to the output of the phase voltage transition sensor B from the negative half wave to the positive one, the phase transition voltage sensor 4 from the positive half wave to negative, output which is connected to the S-input of the RS-flip-flop 5, the R-input of which is connected to the output of the phase transition voltage sensor 6 from the negative half-wave to the positive, the outputs of the flip-flops 2 and 5 are connected respectively to the inputs I and K of the IK-trigger 7, counting input which is connected n output transition ;; sensor 8, the phase A voltage from the positive to the negative half-cycle, the flip-flop output

oh oh

4 S

7 is connected to the change-over input of the switchboard distributor 9, to the information input of which the output of the angle controller 10 is connected.

The device works as follows.

The inputs of the sensors 1,4,8, and 3,6 receive the network voltage in direct or reverse order (Vcnp and Vcorp. Fig. 2 diagrams) at the outputs of the sensors 1,4 and 8 short pulses are formed, corresponding to the moments of voltage transition the network phases are from positive half-waves and negative, and at the outputs of sensors 3 and 6 are short pulses when the voltage of phases B and C goes from negative half-waves to positive (Vinp, Vice, Vanp, / goiter, V / inp, V4o6, Venp, Veo6 , Vsnp, Veo6, FIG. 2). The signals of sensors 1 and 4 set the triggers 2 and 5 to state 1, and the signals of sensors 3 and 6 to the state O (V2np, V2o6, Vsnp, Vso6. Figure 2). The output signals of the flip-flops 2 and 5 are received respectively at the I- and K-inputs of the trigger 7, to the C input of which short pulses are received from the sensor 8. As a result, during a direct phase sequence, the signal O is constantly present at the output of the trigger 7. (, FIG. 2) and the switch-distributor 9 shifts the control pulses to the right. With reverse phase rotation at the output of the trigger 7, the signal 1 (Fig.2) and the pulse shift occur to the left.

Thus, by jointly supplying power to the power and control circuits of the converter, the phasing of the converter at the installation site is eliminated by appropriately switching the switch

single channel control unit. This will allow for increased productivity during setup.

Claims (1)

Claims of the invention: A single-channel device for controlling a three-phase electrooiler made on controlled valves, containing phase transition sensors of the supply voltage from the positive half-wave to negative and phase transition sensors of the supply voltage from the negative half-wave to the positive; switch-distributor of opening pulses through the converter valves, characterized in that. In order to ensure operability in both direct and reverse phase mains voltage phases, the first RS trigger, the second RS trigger, IK trigger, input S of the first RS trigger are connected to the output of the transition sensor from the positive half wave to the negative voltage. phase B, input R is connected to the output of the transition sensor from the negative half-wave to this positive voltage, input S of the second RS flip-flop is connected to the output of the transition sensor from the positive half-wave to negative voltage of phase C, and input R is connected to the output the sensor of the transition from the negative half-wave to the positive, the input I of the IK-trigger is connected to the direct input of the first RS-flip-flop, the input K is connected to the direct output of the second RS-flip-flop, and the counting input C is connected to the output of the transition sensor from the positive a half wave to the negative voltage of phase A, and the output of the flip-flop is connected to the input of the switchboard pulse distributor. AT / J