SU1293789A1 - Device for controlling conditions of electrical substance - Google Patents

Abstract

This invention relates to the field of electrical engineering. The purpose of the invention is to increase the reliability and accuracy of maintaining the allowable mode of an electrical substation. The device is designed to operate in all non-emergency modes, characterized by a change in a wide range of active and reactive power transmission. The reactor switching unit 2 generates the Enable or Disable signals when the output of the I3 power compensation module of the I3 compensation is exceeded, respectively, when the output or power generated by the unit I3 is output. The reactor switching unit 3 generates an Enable or Disable signal, provided that the bus voltage is correspondingly greater or less than the allowable levels. The Enable Signals are summed in the OR 5 logic element and fed to the corresponding input of the reactor control circuit 1. The Disable signals are sent to the inputs of the logic element OR 6, between whose output and input Disconnect the reactor control circuit I and the logic element AND, blocking the passage of the signals to turn off the reactor, if the value deviates 5fc (O (L o; & 00 00 (; o

Description

nor is the voltage from the maximum allowable level less than the specified value. Switching off the reactors is possible even if the signal from the output of the functional converter 4 is exceeded,

293789

connected to active and reactive power sensors 11, 12 of a predetermined value due to marginal transmission capacity reserves. 1 il.

one

The invention relates to electrical equipment and can be used in astheness to regulate voltage and reactive power at a node substation of an electrical network, in which there can be an excess, taK and a lack of reactive power, as a result of which it is equipped with shunt reactors and a continuously adjustable compensation unit. reactive power.

The purpose of the invention is to increase the reliability and accuracy of maintaining the allowable mode of an electrical substation,

The drawing shows a diagram of the proposed device.

The device contains a reactor control circuit (RMS) 1, blocks 2 and 3 Switching reactors, a functional converter 4, logic elements OR 5 and 6, logic element AND 7, comparison block 8, sensor 9 Loads of a continuously adjustable reactive power compensation unit, for example 10 transformer busbar substation, sensors active 11 and reactive 12 power transmission lines.

Input Enable the reactor control circuit 1 is connected to the output of logic element 5, two inputs of which are connected to the outputs. Switch reactor blocks 2 and 3, the inputs of reactor switch blocks 2 and 3 are connected respectively to the load sensor 9 of the continuously adjustable reactive power compensation unit 13 and to the transformer 10 busbar voltage 14 substations.

Input Switch off the control circuits of the reactor 1 is connected to the output of the logic element AND 7, one of the two INPUTS of which is connected to the output

the logical element OR 6, and the three inputs of the last connection: respectively to the outputs Turn off the switching units of reactors 2 and. 3 and to the output of the functional converter 4. The inputs of the functional converter 4 are connected to sensors I and 12 of the active and reactive power 15 of the electricity transmission,

The device is designed to work in all non-emergency modes, which are characterized by a change in a wide range of flows of active (P) and reactive (Q) power over

15, simultaneously with the change in the load of the transmission under the influence of an automatic voltage regulator (AVR), which is part of block 13

 power varies the load of this unit, as well as the voltage on the tires 14, since its regulation is carried out with a certain statistic depending on the AVR setting and the method of connecting the reactive power compensation unit 13 (directly or through reactance) to the tires 14, at unloading of power transmission 15, block 13 of reactive power compensation goes into consumption mode, and the voltage on buses 14 tends to increase. The increase in power flow for power transmission 15 leads to a decrease in

5 voltages on the tires 14 and to an increase in the load of the reactive power compensation unit 13 in the direction of generation,

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 The device works as follows.

The reactor switching unit 2 combines the two units 16 and 17, the comparisons for which are supplied

. the averaged value Q of the load of the reactive power compensation unit 13

0

In block 16, this value is compared with the setpoint Q, the maximum allowable consumption of reactive power by block 13, and under the condition Q - Q 0, the switch-on signal is generated. In patch 17, Q is compared with setpoint Q, the maximum allowable generation of reactive power by unit 13, Under the condition Q, the voltage change (jump) on Pgana 14 when one reactor is turned off. Under the condition that - the comparison unit 8 generates a signal which is fed to the second input of the logic element 7 and releases the shutdown signal of the reactors 16. Thus, the interaction of the comparison unit 8 and the logic element 7

-Q 0 block 14 generates a signal that prevents premature shutdown of reactors 16, which can cause an increase in voltage on the buses 14 of the substation above the maximum permissible level.

to turn on

Depending on the magnitude of the setpoint, the voltage at the input of the AVR of the reactive power compensation unit 13, when the load on the power transmission 15 changes, can occur or the adjustment range of the unit 13 (determined by the difference Q - Q) exhausts at an acceptable level.

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reactors 16, which can cause a voltage increase on the buses 14 of the substation above the maximum allowable level.

A functional transducer, which is itself a functional transducer 4 with two inputs with a threshold element 20 at the output, transforms by a given function

On buses 14, or the achievement of the limit dependency of the signals of the date level of this voltage with a sufficient adjustment range of block 13, therefore, a second reactor switching unit 3 in its device is introduced into the device similar to that of the reactor switching unit 2.

Included in, the composition of the reactor switching unit 3, the comparison unit 18 compares the average voltage U of the busbar voltage 14 with the setpoint. the maximum allowable voltage of the tires, and provided both - and 0 generates a Enable signal, Block 19

sravnegash compares the signal U with the set of 35 elements OR, the logical element AND and

and

MtiK- minimum acceptable

The sensors of active and reactive power of the transmission line allows to increase the reliability and accuracy of maintaining the allowable mode of an electrical substation.

The voltage level on the tires is 14, and, provided both - and 0, produces a Disable signal,

Enable signals generated by blocks 2 and 3 of the switching reactors are summed up in the logic element of IL 5 and are fed to the corresponding input of the reactor control circuit 1.

The Disable signals generated by blocks 2 and 3 are fed to the inputs of the logic element OR 6, between the output of which and the Disable input

A device for controlling a mode of an electrical substation with a transmission line under it, with reactors and an adjustable reactive power compensation block containing a control circuit for a rektostema 1 control of reactors B1, a voltage transformer for tires

logical element And 7, blocking the point of the loop. H "PnTT v" pglgt ™ substation, load cell of an adjustable reactive power compensation unit and reactor switching unit, made in the form of two comparison elements, whose input is connected to a load sensor of an adjustable reactive power compensation unit, which differs from to increase reliability

passing the shutdown signals of the reactors 16,

. The difference signal -U - the output signal of the comparison unit 18, which is part of the reactor switching unit 3, is fed to the input of the comparison unit 8, where it is compared with the setpoint bUg.

changes (jump) in voltage on Pgana 14 when one reactor is disconnected. Under the condition of - the comparison unit 8 generates a signal which is fed to the second input of the logic element 7 and releases the shutdown signal of the reactors 16. Thus, the interaction of the comparison unit 8 and the logic element 7

reactors 16, which can cause a voltage increase on the buses 14 of the substation above the maximum allowable level.

The functional transducer, which is a functional transducer 4 with two inputs with a threshold element 20 at the output, converts the signals of the date 5 according to a given functional dependence.

0

Chips 11 and 12 of the active and reactive power of the transmission line 15 to signals that fix the marginal reserves of transmission capacity under the conditions of reliability. The signal produced by the functional converter 4 is summed up in the IL 6 logic element with the signals of the Disconnect Units 2 and 3 switch over of the reactors.

Availability in The proposed device for a functional converter, a second reactor switching unit, a comparison unit, two logic elements

The sensors of active and reactive power of the transmission line allows to increase the reliability and accuracy of maintaining the allowable mode of an electrical substation.

Claims (1)

Invention Formula A device for controlling a mode of an electrical substation with a suitable power line to it, with reactors and an adjustable reactive power compensation unit, containing a control circuit rarely a tire voltage transformer get shaggy. H "PnTT v" pglgt ™ substation, load cell of an adjustable reactive power compensation unit and reactor switching unit, made in the form of two comparison elements, whose input is connected to a load sensor of an adjustable reactive power compensation unit, which differs from to increase reliability and the accuracy of maintaining the allowable mode of the substation, a functional converter of active and reactive power was entered into the signal fixing the marginal power transmission capacity reserves according to reliability conditions, the threshold element at the output of the functional converter, the second reactor switching unit, made in the form of two elements of comparison respectively, with the maximum and minimum setpoint, the comparison unit, two logical elements OR, the logical element And and the sensors active and reactive power line capacity., and the input Enable reactor control circuits through the first Editor S. Lisin Order 392/56 Compiled by K.Fotina Tehred I. Popovich Corrector A Circulation 619 Subscription VNIIPI USSR State Committee for inventions and discoveries 113035, Moscow, Zh-35, Raushsk nab., 4/5 . Production and printing company, Uzhgorod, Projecto st., 4 the OR element is connected to the outputs Turn on the first and second reactor switching units, the last input is connected to the substation voltage transformer, the input Turn off the reactor control circuits through the AND element and the second element OR is connected to the outputs Turn off the first and second reactor switching units and the output of the threshold element the functional converter, the inputs of which are connected to the sensors of the active and reactive power of the transmission line, the second input of the element I is connected to the output through the comparison unit ohm of the element difference compared with the maximum setting of the second reactor switching unit. Proofreader A.T. sko