SU1259237A2 - Capacitor bank controller - Google Patents

Abstract

The invention relates to the field of electrical engineering and can be used in all enterprises to control compensating installations for a minimum of electrical power losses in the enterprise network. The purpose of the invention is to increase control efficiency and enhance functionality. This goal is achieved by the fact that in the device there are reactive power sensors 8) 7 installed at the locations of the compensating units, the signals from the outputs of which are fed to the quadrants 9, and then to the scale amplifiers 10, which take into account the resistance of the supply lines, receive signals proportional to the loss of electricity from the transmission of reactive power to the network node. The activation of the compensating installation or its section occurs in the node where the losses are maximum and the disconnection is where the losses are minimum. 3 il. Additional to auth. St. No. 1096628. 9 (LS3 SP with ts5 CO VI K

Description

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The invention relates to the power industry, can be applied in all enterprises of the national economy to control the compensating installations for the minimum loss of electricity in the enterprise network, and. is an improvement on the device auth, sv. No. 1096628.

The aim of the invention is to increase the efficiency of control and expand the functionality of the controller by reducing the power losses from reactive power flows and controlling the consumption of reactive power and the operation of compensating devices in several units of the enterprise network.

FIG. a block diagram of the proposed automatic controller is presented; in fig. 2 is a block diagram of a loss analysis block (BAL) and a switching point determination (OMC); in fig. 3 is a block diagram of a linearly decreasing and linearly increasing voltage generator.

The output of active power sensor 1 (Fig. 1) is connected to one of the inputs of adder 2, the output of reactive power sensor 3 is connected to divider 4, the output of which is connected to the second input of adder 2, the output of which is connected to one of the inputs of the reacting authority 5, The second input of which is connected to the setpoint adjuster 6 of the settings, the output of the reacting body 5 is connected to the input of the time-delaying organ and the output unit 7.

The 8i 8rt reactive power sensors installed at the places where compensating devices are located are connected to the corresponding inputs of a block of 9 quadors consisting of 1 quadrants, the outputs of which are connected to the corresponding inputs of a block of 10 scale amplifiers (HEU) consisting of consider the resistance of the supply lines. The outputs of the BMU 10 are connected to the corresponding information inputs of the BAL and coolant P. The outputs of the BAP and the coolant 11 are connected to the corresponding executive bodies 12, which enable and disable compensating devices and their sections.

The unit for analysis of losses and determination of the switching point (Fig. 2) consists

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of the two groups of comparators, the first inputs of each pair of comparators belonging to different groups are connected to the corresponding information input. The second inputs of the first group of comparators 13 are connected to the output of a linearly decreasing voltage generator (DFS) 14, and the second inputs of the second group of Comparators I5

10 are connected to the output of the linearly rising voltage generator (GLNR) 16. The input of the Glyph 14 is connected to the first control input, and the input of the GLRN 16- to the second control input. Outputs

The / 5 of all comparators of both groups are also connected to the inputs of the logical element OR 17, the output of which is connected to the inputs of GLUN 14 and GLRN 16, the block diagram of the linear generator

20 of the decreasing voltage (Fig. 3) is similar to the block diagram of a linearly increasing voltage generator. The only difference is that the linearly decreasing voltage generator at the 25th input and the voltage of the capacitor in the feedback circuit of the operational amplifier are positive, and the linearly increasing voltage generator is negative.

30 The output of the electronic switch 18 is connected to the input of the operational amplifier (OU) 19, in the reverse circuit of which a capacitor is connected. The second input of the electronic key 19 is connected to the output of the logic element OR 17, to which electronic switches 21 and 22 are connected via a delay line (LZ) 20, which are also connected to a capacitor 23 and a resistance 24, a resistance 25 is connected to the resistance 24, which is connected with a source of constant positive (negative) voltage.

The device works as follows

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The signal from the reactive power sensor 3, which is installed at the entrance of the electrical network of the enterprise, is supplied through divider 4 to one of the inputs of adder 2, to the second input of which a signal is received from the active power sensor, which is also installed at the input. Setpoint adjuster 6 sets response thresholds 5, which is triggered when the value from the output of the adder 2 reaches one of the thresholds and will give a command to the time delay organ and the output block 7, on the one input of which the On command appears or on the other - Open switch, These commands are sent to the control ports of the BAP and the OMK P.

The signals from the 8 / - 8 reactive power sensors installed at the locations of the compensating devices arrive at block 9 of quadrants, the signals from which, proportional to the squares of reactive powers in these nodes, go to the BMU 10, from which signals proportional to the losses in the nodes, arrive at the information inputs BAP and OMK 11.

The signals from the information inputs of the BAS and the OMC 11 are fed to the first inputs of each pair of comparators 13 and 15. The Enable command is received through the first control input of the BAP and the OMC 11 to the electronic key 18 GLUNA 14 and launches the OU 19 operating in the integration mode. The magnitude of the voltage at the output of the op-amp 19 begins to decrease from a value equal to the voltage of the capacitor 23, which must be greater than the magnitude of the greatest loss of electricity in the network of this enterprise. HLRN 16, which starts its operation when the Disconnect command is sent to the second information input of the BAP and OMK 11, works in a similar way. The voltage should start to increase from a value less than the smallest loss of electricity in the network of this enterprise. The linearly decreasing voltage from the output of the GFT 14 is fed to the second inputs of the comparators 13 of the first group, and the linearly growing one to the second inputs of the comparators 15 of the second group. When a linearly decreasing voltage is applied first, the comparator (at the output, a signal appears, which is authorizing for switching on the compensating device in the given node), at the first input of which is the maximum signal, i.e. the node in which the losses are maximal is singled out, and a signal is generated to turn on the compensating unit in this node. When a linearly increasing voltage is applied, the first comparator is triggered (a signal appears at the output that permits the shutdown of the compensating unit in this node) at the first entrance

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the minimum signal, i.e. the node is isolated with minimal losses and a signal is generated to turn off the compensating device in the node. The signals from the outputs of the comparators are sent to the actuators 12, which enable or disable the compensating device in the node. The signals from the comparators' outputs are also sent to the OR 17 gate, the signal from the output of which arrives at the electronic key 18 GLUN 14 and GLRN 16, stops the operation of these generators in order to avoid the subsequent comparators to operate. This signal from the output of the element OR 17, through the LZ 20, arrives at the electronic switches 21 and 22, through which the capacitor 23 is charged before the initial voltage, i.e. GLUNN 14 and GLRN 16 return to the initial position, since the decrease or increase in voltage at the outputs of these generators must begin with a value slightly greater than the voltage corresponding to the highest Loss of electricity in the network of the enterprise, or from less than the voltage value corresponding to the least loss.

In the proposed device, the control efficiency is increased due to the reduction of electric power losses and from reactive power flows in the enterprise power supply network. This is achieved through the introduction of reactive power sensors installed at the placement sites of compensating devices, a block of quadrants and large-scale amplifiers, which allow to receive signals proportional to the values of electric power losses from the transmission of reactive power through the network, and a loss analysis and determination unit. switching places of the compensating device. This unit allows the analysis of losses and the generation of a signal to switch on the compensation of the installation in the node where the losses are maximum, and the disconnection where the loss is minimum. The introduction of these units also expands the functionality of the device, as it allows controlling the consumption of reactive power and the operation of compensating installations in several nodes of the enterprise’s electrical network by installing re $ 1 sensors in them.

active power and supply of signals from them to the block of quadrants, BMU, BAL AND OMK.

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switching,: moreover, the unit for analysis of losses and determination of the switching point is made in the form of two groups of comparators, the first inputs of each pair of inventions that belong to different groups,

connected to the corresponding information outputs of the block of large-scale amplifiers, the second inputs of the first group of comparators are connected to the output 10 of a linearly decreasing generator. Automatic capacitor battery controller according to aut. St., No. 1096628, characterized in that, in order to increase the efficiency of control and enhancement of functionality, it is equipped with reactive power sensors installed at the locations of compensating units, a block of quadrants, a block of scaled amplifiers, a block of loss analysis and determination of a switching point and executive bodies, and the outputs of the p sensors of reactive power are connected to the block of quadrants, the outputs of which are connected to the block of large-scale amplifiers, the outputs of which are connected to the block of analyzers for loss and location determination

and the second inputs of the second group of comparators are connected to the output of a linearly increasing voltage generator, the inputs of these generators are connected to the OR logic element, to the inputs of which are connected the outputs of all comparators, which are also connected to the From and - 20 switch on the time delay and the output unit connected to the second inputs of the ramp voltage generator and the ramp voltage generator, respectively.

the second inputs of the second group of comparators are connected to the output of a linearly increasing voltage generator, the inputs of these generators are connected to the OR gate, the inputs of which are connected to the outputs of all comparators, also connected to the Outputs and The switch on the time delay and the output unit are connected to the second inputs of the generator of the linearly decreasing voltage and the generator of the linearly increasing voltage, respectively.

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Editor O. Yurkovetska

Compiled by Oh, Nakazna

Tehred L. Serdyukova Proofreader M. Samborska

Order 5120/45 Circulation 836 Subscription

VNIIPI USSR State Committee

for inventions and discoveries P3035, Moscow, Zh-35, Raushsk nab., 4/5

Production-polygraphic enterprise, Uzhgorod, st. Project, 4

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Claims (1)

Claim Automatic regulator of capacitor banks according to ed. St., No. 1096628, characterized in that, for the purpose of increasing control efficiency and expanding functionality, it is equipped with η reactive power sensors installed in the locations of compensating installations, a block of quadrators, a block of scale amplifiers, a block of loss analysis and determining the location of switching and executive bodies, and the outputs η of reactive power sensors are connected to a block of quadrators, the outputs of which are connected to a block of large-scale amplifiers, the outputs of which are connected to an analysis unit Otero and determine the switching space ,. ' moreover, the block of loss analysis and determination of the switching location is made in the form of two groups of comparators, the first inputs of each pair of which ₅ belonging to different groups are connected to the corresponding information outputs of the block of large-scale amplifiers, the second inputs of the first group of comparators are connected to the output 10 of a linearly decreasing voltage generator and the second inputs of the second group of comparators are connected to the output of a linearly increasing voltage generator, the inputs of these generators are connected · 15 to the logic element - OR, to the input s which are connected the outputs of all comparators are connected also with inputs of the executive bodies, and outputs and Ot20 Enable Enable authority holding time and output unit connected to the second oscillator input sootvetstvennok linearly decreasing voltage generator and a linearly increasing voltage. Figure 2 Fig.Z