SU1029377A1 - Method of controlling group of n thyristorized voltage controllers - Google Patents

Abstract

A METHOD FOR MANAGING A GROUP FROM THE THRISTORNESS OF VOLTAGE REGULATORS, which consists in connecting controllers to the network, fixes the beginnings of the half-periods of the network voltage, generates control pulses of the thyristors of the regulators, and TL and H a-. y sch. and so that, in order to reduce the effect on the network, the network voltage half-periods are numbered in order, considering the first full half-period as the first half-period after connecting the controllers to the network, the first control thyristor pulse generation takes place at the beginning of the first, h + 1 st, 2l + 1 th, etc. half-periods of the mains voltage, the thyristors of the second controller at the beginning, the 2nd, P + 2-TH, 2n + 2-TH, etc. half-time of network voltage, etc., of the h-th regulator from the h-th regulator - at the beginning of the n-th, 2-th, etc. half-periods of the mains voltage, and the duration of each impulse control is set less than the length of the half-period of the mains voltage.

Description

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The invention relates to electrical engineering and can be used for discrete control of DC voltage on loads connected through thyristor controllers to an AC network.

A known method of controlling thyristor voltage regulators, which consists in connecting the regulators to the network, forms a control pulse for the regulators, the duration of which is equal to the duration of the operation of the corresponding regulator SP.

The disadvantage of this method is the uneven loading of network phases due to the lack of order in the sequence of operation of the regulators ..

The closest in technical essence and the achieved effect to the proposed one is a method of controlling thyristor controllers of charge, which concluded that. they connect the regulators to the network, fit the beginnings of half-periods, of the mains voltage, form the impulses of the control thyristors of the regulators C2. ; However, this method is characterized by a significant consumption of reactive power from the network and the presence of; distortions in the mains voltage by the converter with a load power comparable with the power of the network. I The purpose of the invention is to reduce the impact | nor on the network.

; The target is achieved by the fact that according to the control method of the pyristor regulators, the voltages number the mains half-periods in order of consequence, considering the first half-full neop-i half full half-period after connecting the controllers to the network, the specified pulse shaping -H; | control thyristors first: the controller at the beginning of the first, ri + i: rr0 | 2ti X-th, etc. half-lines of the line voltage, the second-thyristor thyristors at the beginning of the 2nd, l + 2th, 2fi + 2th, etc. half-periods of the mains voltage, etc., by the thyristors of the p-th controller - at the beginning: h-th, 2h-ro, 3h-ro, etc. half periods; the mains voltage, and the duration of the control pulse is set to less than the half-period duration of the mains voltage. ; FIG. Figure 1 shows a regulator circuit with a control unit for reagent licensing of the proposed method; in fig. 2 is a time chart illustrating the operation of the device.

The controller contains a bridge rectifier diodes 1,2,3 and 4, thyristors 5,6 and 7, the moments of switching

which is determined by control block 8. Thyristors connect rectified voltage to loads 9, 10 and 11.

Unit 8 switches on one of the thyristors 5 and 6 and 7 at the beginning of the corresponding half-cycle of the mains voltage. As a result, each of the loads is connected to the rectifier during one half-cycle of the mains voltage, and only one load is connected during each half-cycle.

In item 3, the operation of the device is carried out as follows.

Block 8 contains three channels according to the number of regulators. In each channel of block 8 there is a storage capacitor; in the first, capacitor 12 in the second, capacitor 13, to the third capacitor 14. These capacitors are charged through resistor-diode circuits: resistor 15, diode 16; resistor 17, diode 18; a resistor 19, a diode 20. The voltage from the storage capacitors 12, 13 and 14 in each channel goes through the primary windings of the transformers 21, 22 and 23 to the anodes of the thyristors 24, 25 and 26, through. sequentially connected stabilitrons 27 and 28, 29 and 30, 31 and 32 to the collectors of transistors 33, 34 and 35. The emitter current of each of the transistors 33, 34 and 35 ensures that thyristors 24, 25 and 26 are turned on, respectively. The sequence of rectified half-waves goes to the integrating circuit - resistor 36, capacitor 37. The voltage from the capacitor 37, which does not contain high-frequency components, is differentiated by the circuits: capacitor 38, resistor 39; the capacitor 40, the resistor 41, the capacitor 42, the resistor 43 and is fed to the bases of transistors 33, 34 and 35. Throttle; 44 is used to switch the thyristors 24, 25 and 26. When the rectifier is turned on during one half-wave of the rectified voltage, the drive the capacitor 12 in the first channel through the resistor 15 and the diode 16 is charged to a voltage lower than the stabilizing voltage of the zener diodes 27 and 28. Therefore, the signal formed by the differentiating circuit consisting of the capacitor 28 and the resistor 39 at the time of the first beginning of the next half and supplied to the base of transistor 33, can not cause significant emitter current, since zener diodes 27 and 28 are locked. But by the end of this half-period, the voltage on the storage capacitor becomes greater than the total stabilization voltage of the zener diodes 27 and 28, therefore at the beginning of the first working half-period, the transistor 33 turns on the thyristor 24. The latter produces current through the primary winding of the transformer 21 and the start of signals from the secondary winding of this transformer is thyristor 5. The thyristor 5 connects the load 9 to the regulator rectifier for the time of the 3rd half-wave. Through the thyristor 5, the voltage of the half-wave with the help of the charging circuit - resistor 17, the diode 18 - charges the capacitor 13 so that by the beginning of the next half-wave the voltage on it is enough for the zener diodes 29 and 30, and at the beginning of the next half-wave the thyristor 26 and 6. Tirig. The stopper connects the load 10 to the 10MP, and the next half-pcr through the charging device is a resistor 19, a diode 20, a storage capacitor 14 is connected, which ensures that the thyristors 26 and 7 turn on in a half-period, the thyristor 7 connects the nagrueck 11. During the first half The working half-wave of the thyristor 24 completely discharges the storage capacitor 12. B of the charge up to. the required value and the necessary action is 2 and 3 half-waves number 4 and 5 so that the half-wave with number and + 1 passes through thyristor 5 to load 9. The switching off of thyristors 5, b and 7 takes place at the beginning of the half period following the half-cycle, during which each of them was included. Switching off is provided both by reducing to zero the voltage at the output of the bridge rectifier and by applying reverse voltage due to the inductive nature of the load on the outputs of the regulators. To turn off thyristors 24, 25, and 26, the circuit provides for the presence of throttles 44, When turned on: and any of the thyristors 24, 25, and 26, the voltage drop across the choke 44 ensures that the previously turned on thyristor is turned off. The proposed device implements a frequent case of cito-snail. The advantage of the proposed method is that during operation of the controllers, one of the loads is connected to the network at any time. As a result, the network operation mode is significantly improved due to more equal loading time. Full network load uniformity over time is achieved with equal loads on the controller outputs. At the same time, the influence of the consumer on other energy consumers of this network is completely eliminated.

Claims (2)

METHOD FOR MANAGING A GROUP OF P THYRISTOR VOLTAGE REGULATORS, which consists in connecting the regulators to the network, recording the beginning of half-periods of the mains voltage, and generating control pulses for the thyristors of the regulators, as a rule. and with the fact that, in order to reduce the effect on the network, the half-periods of the mains voltage are numbered in order, considering the first half-period as the first full half-time after connecting the regulators to the network, the indicated formation of the thyristor control pulses of the first regulator at the beginning of the first, n + 1st, 2nd + 1st, etc. half periods of the mains voltage, thyristors of the second regulator in n'achal 2nd, η of the 4th-2nd, 2nd and + 2nd, etc. half periods of the mains voltage, etc., by the thyristors of the hth regulator - at the beginning of the ηth, 2th ηth, etc. half periods of the mains voltage, and the duration of each control pulse is set shorter than the duration of the half period of the mains voltage. „“ SU. „, 1029377