SU1427479A1 - Apparatus for regulating voltage in power transmission line - Google Patents

Abstract

The invention relates to electric power industry and can be used in regulating the voltage of a high-voltage transmission line. The purpose of the invention is to reduce the loss of active power and energy in the transmission line by taking into account the loss of energy from the flow of active and reactive power, taking into account the capacitive currents of the line. To achieve the goal, the device is equipped with a reactive current sensor 18, adders 13 and 16, quad 14, multipliers 15 and 19, divider 6. These blocks allow to take into account energy losses from active and reactive power flows in the form of LRs (1 - + 1р. ))., where I, IP is the active and reactive components of the operating current that is constant along the entire line, 1 is taken with a plus sign for a capacitive character and with a minus for an inductive one; 1 - capacitive current of the line, considered as uniformly distributed along. load lines; - active resistance of the power line. 1 il. (L with

Description

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The invention relates to power industry and can be hippo young when controlling the voltage of a high-voltage power line.

The purpose of the invention is to increase the loss of active power and energy in the power line by taking into account the loss of energy from active and reactive power flows, taking into account the capacitive currents of the line.

The drawing shows a block diagram of a device for regulating voltage in a power line | Dachi.

A: The device consists of a serially connected loss sensor 1 for the corona and a converter 2, which converts the corona loss signal into a signal proportional to the increment of the corona loss.

A quadrant 4 and a multiplier 5 are connected in series to the output of current sensor 3, and a resistance meter is connected to the second input of which. The adder 7 and the converter 8 are connected in series to the output of the divider 6, the output of the latter is connected to the inputs of the valves 9 and 10 transmitting signals of different signs. The output of converter 2 is connected to the second input of the adder 7, the second output of current sensor 3 is connected to the second input of conversion body 8. The output of the reactive current sensor 11 is connected to the subsequently connected communication channel 12, the second adder 13, the second quadrant 14 , the second multiplier 15 and the third adder 16, the output of which is connected to the input of the divider 6. The second input of the second multiplier 15 is connected to the output of the second divider 17, the input of which is connected to the resistance meter. The second sensor 18 reactive current is connected to the second input of the adder 13. The output of the third multiplier 19 is connected to the second input of the adder 16, the third input of the latter is connected to the output of the multiplier 5. The first input of the multiplier 1 9 is connected to the second output of the TV channel 12, the second input is connected to the second output of the adder 13, and the third input with a resistance meter.

The device works as follows.

The signal from the corona loss sensor 1 is converted by the transducer.

and Elite, nponopuvionalnuk increment ™.) power of the loss of the corona voltage. The signal, proportional to the value of the current T in the power line, coming from the Z. sensor, is squared 4 by square 4 and multiplied by a multiplier 5 by a factor proportional to the active resistance of the line. A signal proportional to the value is applied to the third input of the adder 16.

The signal proportional to the value of reactive current 1p at the beginning of the line from the output of the sensor 11 reactive current via communication channel 12 is fed to the first input of the adder 13 and the first input of the multiplier 19. In the adder 13, the signal proportional to the value of 1p 1 is summed with the signal proportional to the value of the reactive current current T p at the end of the line from the output of the sensor 18 reactive current. From the output of the adder 13, the signal proportional to the capacitive current value of the line I (.Ip.,, Enters the quad 14 and to the second input of the multiplier 19. The signal proportional to the value of T ,, is multiplied by the multiplier 19 by a signal proportional to the value of 1p, and by the factor proportional to the active resistance of the line. From the output of the multiplier 19, the second input of the adder 16 receives a signal proportional to + 1s -Ip-K. In the quadrant 14, the signal proportional to the capacitive current 1 in the line is squared and fed to the multiplier 15, where it is multiplied on coefficient proportional to the active resistance of the line divided in divider 17. From the output of multiplier 15, the signal proportional to I (.R / 3) goes to the first input of the adder 16, where it is added to the signals from multipliers 5 and 19. To the input of the divider 6 from the output of the adder 16, a signal is received that is proportional to the magnitude of Ijj K + TcK / 3, where it is converted into a signal proportional to the increment of the power loss in the line wires with respect to the voltage, taking into account the capacitive currents of the line. The received loss increment signals are fed to the adder 7. The signal from the input of the adder 7 is fed to the input of the converter 8, where from the voltage flowing from the sensor 3 a signal is generated that the excess power loss is exceeded

on Kopi;) ny over the increments of the miorepija iiorepij in the wires, taking into account the loss of active power, the flow of capacitive currents or the excess power of the losses in the wires over the increments of the power to the corona loss.

If the corona loss is increased by the power over the loss in the wires by the amount of the signal generated in the converter 8, the valve 9 is given a signal acting on an additional mechanism (not shown) that reduces the line voltage by one step, for example - 1 %, as a result of the decrease in voltage, the corona losses are reduced, and the losses in the wires are increased. If, after changing the voltage, the increment of the power loss by the corona again exceeds the increment of the power loss in the wires by the amount of the signal proportional to the current in. the power line, the signal is again given through the valve 9, acting on the actuator, reducing the voltage by one step. This process continues until the adjustment control is exhausted or the corona loss power increment does not exceed the increment of the power loss in the wires by the signal size, proportional to the voltage control device in the transmission line, containing a series-connected current sensor, quadrant, multiplier , serially connected divider, adder, converter, the output of which is connected to the inputs of two gates, loss sensor for the crown. Connected to the second converter, the output of which is connected to the second input of the adder, the second input of the first converter connected to the second output of the current sensor, characterized in that, in order to reduce the loss of active power and energy in the transmission line, by taking into account the energy loss from the active power flows and reactive power

power line current. In these cases of decreasing the voltage npo - jg, taking into account the capacitive line currents, it will not occur. If the increment is provided with series-connected power losses in the wires exceeds the increment of the power loss per corona by an amount proportional to the current in the transmission line, then the signal passes through the valve 10 and on.

a reactive current sensor, a TV channel, a second adder, a second quad, a second multiplier, a third adder, the output of which is connected to the input of a divider, a second divider, the input of which is connected to a resistance meter, and an output of a second sensor of a reactive current,

line speed increases.

An increase in voltage will lead to an increase in corona losses and a decrease in wire losses. When the current in the transmission line is changed, the magnitude of the signal for transforming the increment of power (corona loss over the increment of the power loss in the wires or the signal for increasing the increment of power loss in the wires over the increment of the power loss per corona) automatically changes.

Thus, the proposed device allows more accurate

to take into account the losses on the heating of wires in the power line of the power source with separate accounting for the energy prepared from the active and reactive power flows, taking into account the capacitive currents of the line. This makes it possible to reduce the losses of active power and energy in the line due to the refinement of the value of the optimal value of the controlled voltage, determined by the optimal ratio between the losses in the wires and per corona.

Claims (1)

Invention Formula A device for regulating the voltage in the power line, containing a series-connected current sensor, a quadrant, a multiplier, a series-connected divider, an adder, a converter, the output of which is connected to the inputs of two gates, a crown loss sensor. Connected to the second converter, the output of which is connected to the second input of the adder, the second input of the first converter connected to the second output of the current sensor, characterized in that, in order to reduce the loss of active power and energy in the transmission line, by taking into account the energy loss from the active power flows and reactive power taking into account the capacitive currents of the line, it is equipped with series-connected taking into account the capacitive currents of the line, it is equipped with series-connected a reactive current sensor, a TV channel, a second adder, a second quad, a second multiplier, a third adder, the output of which is connected to the input of the divider, a second divider, the input of which is connected to a resistance meter, and the output of the second reactive current sensor , the output of which is connected to the second input of the second adder, the third multiplier, the first input of which is connected to the second output of the communication channel, the second input is connected to the second output of the second adder, the third stroke is connected to the sr resistance meter, and the output is connected to the second input of the third adder, the third the input of which is connected to the output of the multiplier.