SU705476A1 - Device for simulating transformer-thyristor a-c voltage controller - Google Patents

Description

-, -. -;

The invention relates to the field of analog computing technology and can be used to study magnetic thyristor regulators of alternating current.

A device for simulating AC autocompensators using the instantaneous variable variable method, performed on the elements of an analog computer {t |

A disadvantage of this device is that it is not applicable to mono; 4 (transformer-gyrist switching of voltage regulators with natural switching thyristors.

The closest in technical terms to the invention is a device containing post-connection-connected input adder, an integrator and a functional converter connected to the first input of the output adder, and a series-connected first inverter, an integrator and a second inverter connected to.

} -BTX3iKf of the output adder, where the Cyrmy input of cyMMaTqpa is connected to the inverter nsfffioro input and is the input of the device, the control pulse shaping, the first input of which is connected to the first input of the input adder, and the output of the control pulse generation. control winding.

A disadvantage of the known device is the need to apply special controlled integrators for modeling and a mandatory solution of the basic differential equations for thyristor currents.

The purpose of the invention is to increase the accuracy of modeling.

The goal is achieved by additionally introducing an operational amplifier and a block of an anode current module, the input of which is connected to the output of an output adder, and an output of an output unit of an anode current module 37 is connected to the second input of the control pulse, the input of an operational amplifier connected to the output of the output adder, the output of the operational amplifier is connected to the second input of the input adder, in feedback of the operational amplifier the make contact l of the control p is connected le. The invention is illustrated in the drawings. FIG. 1 is a schematic diagram of a variable voltage regulator; in g, 2 is a schematic diagram of a device for simulating an -opp-controller regulator. The device contains an input adder 1, an integrator 2, a functional converter transducer 1b 3, an inverter 4, an integrator 5, an inverter 6, a driver for controlling pulses 7, an output summator in, a control relay 9 on its own 10 contact, an operational amplifier 11, a block extraction of iodus of anode current 12. The device works as follows: {SHY .--.:: - d: -; - -.:,: ------.;:, .. The construction method of the device is based on that, from the point of view of the structure of the model included in its composition, the block of the linear regulating element implanted on the operational amplifiers, Potentiometers and resistors, is equivalent to a block of thyristor control element, modeled with the help of operational amplifiers, diode elements, limiters, and relays. At mutual replacement of these blocks, the structures of the model are not disturbed. The device diagram is constructed on the basis of the equations:, s..i, aF. - -. -ovt - -. “D U, -U ,. where 0. - voltage of the power supply network; T, is the current of the primary network of the transformer; Tj - About the secondary circuit of the transformer; - magnetizing current of the transformer; . 6 1 2. active resistances of the primary and secondary circuits; L - inductance of the secondary circuit of the transformer; y ; - transformation coefficient; GYK voltage on a torque switch; (C) is the frequency of the supply. The drafts above the designations of variable values indicate that the latter are expressed in relative units. The use of a single machine frequency g, provided that the unit of relative resistance is equal, allows one to introduce a single scale for the relative values of voltages, currents and magnetic flux. The magnetizing current of the transformer is determined by the formula OCP - non-hysteresis component; 1 G - hysteresis composition is leyushchy; L g is the component of eddy currents, and Y K is the proportionality coefficient determined experimentally or by calculation. The thyristor group modeling unit is a functional one; A converter reproducing the total nonlinear current-voltage characteristic of the thyristor key as a whole — Ouc TC. mc-x, i.e., converts a signal proportional to the current of the thyristors to a signal proportional to the voltage. The transition of the Thyristor key from one state to another is accomplished by abrupt changes in the ratio (| of the amplification of the operational amplifier, which is done by closing or opening the closing contact 10 of the switch 9.

If contact 10 is open, the gain of the operating force is large, which corresponds to the encroachment; An argument of a thyristor key, and vice versa.

When a sinusoidal voltage is applied to the input of the control pulse shaping unit and to the input of the modeling unit of the main part of the transformer electrical circuit, the last voltage and voltage of the current transformer thyristor voltage regulator are suppressed. This produces a voltage proportional to the current of the thyristors. Operational amplifier 11 converts & voltage into a signal proportional to the voltage on the thyristor key From, which then with the opposite sign is fed to the second input of the adder; A sinusoidal voltage, which is applied to the control pulse shaping unit 7, is converted into a sequence of synssidal half-waves of the negative field p. Features that convert to short negative impulses that synchronize the driver's operation with the network. Simulations of changing the state of a thyristor switch depending on the opening angle of the thyristors are carried out by acting on the control pulse shaping unit on the operational amplifier via a push contact of the control relay. When simulating an active-inductive load, it is necessary to take into account the presence of a current in a transistor key in the interval when the mains voltage came through zero and assumed a value that is positive by sign direction 1g) 1ag. The operation of the device should take into account the fact that the conduction state of the thyristor can occur only at the moment of supplying the control signal to a positive anode voltage, nonconductive at the moment when the current of the thyristor decreases to zero. For this reason, the switchings of the relay 9 in the device being described must be controlled not only as a function of the opening angle OL, but also as a function of the current of the TIris 1 -,. To realize this position, the input of the control signal generation unit is given a signal proportional to the

current module / Toot / thyristor, which is produced at the output of the allocation unit module T2 /

Thus, the implementation of a device for modeling a transformer-thermistor controller in accordance with the invention reproduces the processes with high accuracy; in the controller.

ten

Claims (2)

Invention Formula A device for simulating a transform-thyristor voltage regulator of alternating current containing a series-connected input adder, an integrator and a functional converter connected to the first input of the output adder, and a series-connected first inverter, integrator-adder and second inverter connected to the second output an adder, wherein the first input of the adder is connected to the input of the first inverter and is the input of the device 1, 15, the formation of control pulses, the first input of which is connected to the first input input of the adder, and a control relay winding is connected to the output of the control pulse shaping unit, so that, in order to simulate the accuracy of the simulation, an operational the amplifier and the anode current module extraction unit, the input of which is connected to the output of the output adder, and the output of the anode current module extraction module is connected to the second input of the control pulse shaping unit, the input of the operational amplifier is connected to the output of the output adder, the output of the operational amplifier is connected to the second input of the input adder, and the closing contact of the control relay is turned on in the feedback of the operational amplifier. Sources of information taken into account during the examination 1. Copyright certificate: № 398980, cl. G About G 7/62,, 2. H., SimyeaUo “einer vovi Tfi-sristorem greneg ebegren B ehstrovvi 5 and ctlgonmasc1 ine, Neue Tectime, 1965. No. A5 (prototype). one Fie1 "/ 2