SU736351A1 - Device for shaping control angle of static converter - Google Patents

Description

one

The invention relates to electrical engineering of converter converters and can be used in devices for controlling strikes with sand converters, in particular converters with regu- rusirution of oblute and output frequencies.

A device is known for flashing the converter {Containing a series-connected adder, a zero-organ and a distributor, with one input of the adder connected to the network, and another input is given a signal proportional to the output value of the adjustable parameter. The disadvantage of this device is a significant asymmetry of control pulses. distortion of voltage on the AC buses of the converter, which reduces the reliability and speed of the device, as it requires the installation of a phyto s in chains inverse bonds.

The closest technical solution to the invention is a control device comprising a first adder, an integrator, a second adder, a null organ and a distributor connected in series, with one input of the first adder connected to the AC buses of the converter and the other input connected to the output of the pilot angle adjuster1 2 At the same time, the input of the angle adjuster control and one of the inputs of the second adder are connected to the output of the constant current source.

The disadvantage of such a device is that the control angle of the converter depends on the frequency and the actual value of the voltage on the AC buses of the converter. This is explained by the fact that the relationship between the angle yqpeivieni L and the period T and the magnitude Ufni of the voltage on the AC buses is determined by the ratio

(one)

and -Ua, - iagde and - sitna at the output of the angle adjuster;

3736

DO - signal on one of. inputs

the second adder; UJ is the voltage frequency on the AC busses:

  constant integrator time.

From relation (1) it can be seen that the angle of the angle CX depends both on the magnitude of the signals Uy and UQ, and on the period T and on the voltage Umrt of the voltage on the alternating current currents.

The purpose of the invention is to stabilize the control angle regardless of the frequency (period) and the voltage on the current of the converter's transceiver current.

The goal is achieved by the fact that a adder, an integrator, an sTcipofl adder, a zero-organ and a distributor, one input of the first sum of the echoer, is connected to the AC current transformer, null-organ and distributor, and one input of the first sum electr is connected to the AC current transformer, null-organ and the distributor, and one input of the first sum electr is connected to the AC current transformer, null-organ and the distributor, with one input of the first sum electr associated with the AC current transformer converting the alternating current, zero-organ and the distributor and the other input is connected to the output of the control angle adjuster and, a block of signal-shaping signal is entered, the signal is set to the current value of 1fb of the converter, and the shaping unit

, proportional period / current period and current optic transducer on itoiHax AC transformer jfH, prjgchem the output of the form blocker S1ngala, shyuporshunalnogo actrav vzm zmu value on the AC line, you need to connect to the AC input, you need to connect to the AC input, you need to connect to the AC input line, you need to connect to the AC input line, you need to connect to the AC input line, you can connect to the AC input line, you can use pho-wa1sh signal, proportional to the period to the effective value of nanometers on the over-current of the converter, is connected to from the inputs of the second adder.

At the same time, the signal shaping, proportional to the current signal e; Hvno is fixed on the length of the transducer, may consist of a multi-phase cable, the input of which is connected to the transducer buses of the current transducer, and the output to the EJCO setpoint steering angle.

A block of a signal of the signal, the period and the actual vly value of the voltage on the current of the converter, can

consist of current transformers, the primary windings of which are included in the circuit. multi-phase power supply, the input of which is connected to nepeMeHHorb tires

the converter's current, the output to the resistor, the secondary windings of current transformers through opposite-connected zener diodes are connected to TpeyronbfmK and are sub-divided to the input of the bridge rectifier, the output of which is connected to the output of the block, and the inputs of the bridge rectifier are shunt by co-directioners.

In this case, the output of a multi-phase rectifier can be connected to the input of the control angle adjuster.

In addition, the connection of one of the inputs of the first cjTviMaTopa with variable tires 7.x) as a distributor can be made through the slider; control inputs of which are connected to the output of the distributor.

FIG. 1 shows the functional scheme of the proposed device; in fig. 2 and 3 - prshddpial'PZU bloksov scheme, including 1 in it.

The device contains the first adder 1, the output of which through the integrat-op 2 n the second adder 3 is connected to the input zero, the organ 4. The output of the zero organ 4 through the distributor of the imprits 5 is connected to the control inputs of the converter E and the converter 6 and the control inputs of the switch 7, the output of which is connected to one of the inputs of the first ciTviMat4 pa 1. And the input to the buses: AC 8 on the converter 6. Another exit of the first cyK ' vfaTopa is connected to the output of the control angle 9, the input of which is connected to the output of the signal generation unit 10 proportional zhetsh effective value voltage to AC pshnah 8. Audi RS inputs of the second adder 3 is connected to Ezhodom 13. dE $ pM about orshshnalygogo fovaki enacheshpo current signal and the period of the voltage at the AC tire 8.

Claims (2)

Block 11. signal generation, n} X) of the postiunal period and the actual value of the voltage on the AC buses 8, consists of current transformers 12, 13, 14, the primary windings of which are connected to the Pit-1B1 circuit of the multiphase rectifier 15 loaded on the resistor 16 The secondary windings of the current transformer through the oppositely connected stabiliters W 17-18, 19-2O and 21 22 are connected to the input of the bridge of the top of 23. The rectifier inputs are connected by capacitors 24, 25, 2b, and the output is connected to one of the inputs of the second cyiviMaTopa 3 5 Bnoiot 10 and 11, and also switch 7 p. dklyucheny to tires 8 via an AC transformer 27. The output of the switch 7 with toch1YuSTYO zheshge voltage to the phase shift transformer 27 similar tire-on voltage DC converter 28. The device works as follows. The difference signal received at the output of the first adder 1 is integrated by the integrator 2 and compares with the second adder 3 with the reference signal generated by the block 11. The comparison signal is fed to the input of the null organ 4, which switches the pulse to the distributor 5 when the reference is equal to the input to the block 11 and the output signal of the integrator 2, hf this integrator is set to the initial state (the capacitor is discharged, even at the output is zero). The voltage UQ at the output of block 11 is associated with the period and effective value of the voltage on the AC buses 8 of the converter 6 and the signal U at the output of the angle adjuster 9 of the controller 9 by the relation (1). It can be seen from formula (1) that the control angle of the transducer depends both on the frequency (period) and the amplitude of the voltage on the power supply currents, as well as on the Tsu signal of the control angle 9 and the DO signal at the output of block 11. If uzzazannye L / y and Up signals form according to the invention, namely in the form II ||, 1 fTt / ЕТТ, at t o (u, then from (1) and (2) we get, UniflCOSc ШТ, ШТ from where Г, -Т T is a const SO5 -; p S -1 converter, i.e. the steering angle (X does not depend on the frequency and the effective voltage on the overcurrent of the converter current. This is explained with t & l, that when the period changes or the actual voltage on the tires of the alternator current of the converter, the corresponding change either voltage UQ (if only the period changes), or voltage UQ and voltage Uy occurs. high, since the pulsating signals at the outputs of the 1O and 11 units are not solid, and filters with a small constant time can be used to smooth them out. The 10-unit forkofovashsh signal, which is proportional to the actual value of the voltage on the AC buses 8 (see. 2), consists of a multi-phase rectifier that is loaded on the control unit of the transducer 9th transducer. The voltage at the output of the voltage is proportional to the linear voltage of the alternating current 8. The ratio of the period and the effective value of the voltage at Ш1 {first alternating current, is formed at the output of the bridge rectifier 23 (see FIG. 3), whose input is connected to The secondary windings of the current transformers, whose current in the primary windings of which is equal to Rde R co1trol1 of the resistor 16 at the output of the multi-rectifier 15. The voltage U of the secondary windings on the bridge rectifier 23 is determined by the value of the current of the secondary windings ranformat 12-14 equals. U ,, T, UJO 2 КЯС de Kg - coefficient of transport information of transformers 12-14; C - capacitance capacitance capacitance 24 Stabilitrons 17–22 depressorize the capacitors 24–26 in the pauses of the eye of the corresponding secondary windings of transformers 12–14. At the same time, the output of the bridge rectifier 23 becomes practically smoothed, i.e. without pulsations, the magnitude of the coordinates is determined by the load of the straightened 23. The output of the multi-phase top of the bar 15 can be used to obtain proportional to the effective value of the tires on the tires of the alternating current, as shown in {p. 3. Switch 7 makes it possible to obtain an analogue voltage on the DC busbars of the converter, which guarantees the operation of the devices. The proposed device allows to stabilize the control angle of the static inverter regardless of the frequency, distortion, and effective voltage on the overclocked current of the converter. Claim 1. A device for forming a control angle of a static converter containing a shuntly oroedicic first cyMMaTopinHTerpa-rop, a second with, a horn, a zero-organ and a distributor, the o / d input of the first adder is connected to the Shingshi of the forward current of the converter, and aru a go input of the input to the output of the steering angle control, characterized in that, in order to stabilize the pilot &; irresistible irrespective of frequency, distortion, and voltage value on the AC busses of the converter;) is equipped with a signal shaping unit: a signal proportional to the voltage value of the converter current, and a signal shaping unit proportional to the period and the actual voltage value AC buses convert (el and the output of the signal conditioning unit, proportional to the current value of the voltage on the tires of the current, is connected to the input of the angle control device The voltage output is proportional to the period and the actual value of the voltage on the nepQvieHHoro buses of the converter current, connected to one of the inputs of the second adder. 2. The device according to claim 1, that the block is formed: ai: 1 of the signal of the current-acting voltage value on the AC busses of the converter consists of a multiphase voltage miter, the input of which is connected to the overcurrent busbars of the converter, and the output to the input of the control angle adjuster. 3. Device as per Ps 1, characterized by the fact that the dxjpMHpoBaHHs block of the signal is proportional to the period and the actual value of the voltage on the AC power converter circuits consists of a current transformer, the primary windings of which are included in the power supply circuit of a multiphase rectifier whose input is connected to inputs alternating current converter, output to the resistor, secondary oSvfOTKH current transformers through opposing zener diodes connected in a triangle and led to the input of a bridge terminal, whose output is connected to you the block travel, with the bridge rectifier inputs shunted by capacitors. 4, US1: Reality on PP. 1 m 3, which is the fact that the output of the multi-phase rectifier is connected to the input of the control angle adjuster, 5. The device according to claim 1, about the same. that one of the inputs of the first adder is connected to the AC buses of the converter through a switch, which controls the inputs to which the output is distributed. l Sources of information taken into account during examination 1, Patent of the USSR No. 316272, cl, H 02 R 13/16, 1967. 2.Pisarev A, P ,, Detkin L.P. Rublesh1: e thyristor transforms ™. tel mi. M,) E Gergi 1975, p. 124, Fig. 3-15. sH five ttt ttt rf st F AND 7 13-L L L-xiHL 17 /five U RJ  - .... I. .J I neither L .. i J