SU1640775A1 - Capacitor bank control device - Google Patents

Abstract

The invention relates to electrical engineering and can be used in power supply systems of large industrial enterprises containing power lines with a voltage of 6-20 kV. The purpose of the invention is to reduce power and energy losses in the supply line with an intermediate load connection. For this device is equipped with a load current sensor 8 intermediate connection, channel 9 information transfer and the arithmetic unit 10. In the arithmetic unit using multipliers 11 and 12, the values of the reaction are multiplied load current by the corresponding constant, the summation of the received signal by the adder 13, the divider 14 divides the signal of the adder 13 by the second input signal of the multiplier 11. The output signal of the divider 14 is divided by unit 3 dividing by the voltage received from sensor 4. The output signal of unit 3 proportional to the required capacitance value of the capacitor unit 1, is supplied to unit 2 for switching sections, switching the sections of the capacitor unit in proportion to the division of the calculated reactive current of the capacitor unit SETTING on voltage yl slab 1 with

Description

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The invention relates to power engineering and can be used in power supply systems of large industrial enterprises containing power lines with a voltage of 6-20 kV,

The purpose of the invention is to reduce power losses and energy in the supply line with intermediate load connection.

The drawing shows a diagram of the proposed device.

The device contains an adjustable capacitor unit 1, a unit 2 for switching sections of a capacitor unit, a unit 3 division, a sensor 4 voltage, a sensor 5 reactive load current, a load 6, a load 7 intermediate connection, a sensor 8 reactive current load intermediate connection, transmission channel 9 information, the arithmetic unit 10, the multipliers 11 and 12, the adder 13 and the divider 14.

The sensors 5 and 8 of the reactive current of loads are connected to the first two inputs of the arithmetic unit 10, the output of which, as well as the output of the voltage sensor 4, are connected to the input of the division unit 3. The output of the dividing unit 3 is connected to the switching unit 2 of the sections of the condensing unit. In the arithmetic unit 10, multipliers 11 and 12 are connected to its first two inputs, a constant voltage proportional to the resistances of the entire line and its head section is supplied to the second two inputs, the outputs of multipliers 11 and 12 are connected to the adder 13. The output of the adder 13 and the second input of the first multiplier 11 is connected to the input of the divider 14, the output of which is the output of the arithmetic unit 10.

The device works as follows.

The signals from the sensors 5 and 8 of the reactive current of the loads are applied to the first inputs of the arithmetic unit 10. The second inputs of the arithmetic unit are supplied with a voltage proportional to the resistance of the entire line n and its head section G2. In the arithmetic unit, multipliers 11 and 12 multiply the reactive current values of the loads by the corresponding constant, summing the received signal by the adder 13, and dividing the 14 signal of the adder 13 by the second input signal of the multiplier 11. The output signal of the divider 14 is the output of the arithmetic unit 10, is divided by a unit of 3 dividing by voltage received from sensor 4 A signal from the output of dividing unit 3, proportional to the required capacitance of the capacitor plant

1, is supplied to the section switching unit 2, which switches the sections of the capacitor unit 1 in proportion to the partial dividing of the calculated reactive current of the capacitor unit by the voltage.

Power loss in the supply line Д Р from the flow of active and reactive currents is recorded in the form

AR Зп (12а1 + Ip, -, | к + I2k) + 3r2 (l2a2 + I P2-2lp2lk + 2lalla2 + 2lpllp2), (1)

where n, G2 - the resistance of the entire line and the head section;

1a1, ia2 - active current of loads b and 7,

1p1, Ip2 - reactive current loads b and 7;

Ik - capacitor battery current.

From equation (1) after taking prod. d DR

and equating it to zero flood

dik

stroke t current k, providing power losses in the line IP t M + lp2r2

Ik p

If the capacitance of the capacitor bank is adjusted in accordance with formula (2), then the power loss in the supply line having branches will be minimal.

Subjects of industrial enterprises that have a reserve power of compensating devices and feeding along a line containing branches, when installing compensating devices on intermediate branches is impossible due to the absence of free space at substations, the conditions for their operation and large nominal power of batteries produced by the industry for these voltages.

Claims (1)

Invention Formula A device for controlling a capacitor unit, comprising a voltage sensor, the output of which is connected to a dividing unit, the output of which is connected to a unit switching unit of a capacitor unit, a reactive load current sensor, characterized in that, in order to reduce power losses and energy in the supply line with an intermediate connection, it is equipped with a intermediate connection reactive current sensor, information transmission channel and arithmetic unit, to the first input of which through the transmission channel Formation is connected to the sensor of reactive current load intermediate connection, to the second input - sensor reactive load current, the other two inputs of the arithmetic unit are connected to a constant voltage source value proportional to the first and second inputs of the arithmetic line, the output of the arithmetic unit, the outputs of the multipliers of the junction block are connected to the second input of the block, the summer and laziness, while the arithmetic block from the second The inputs of the first multiplier consist of two multipliers, the adder and 5 are dinenees with the inputs of the divider, the output is a multiplier, the first and second two are the output of the arithmetic and multipliers connected to the corresponding block.