RU2790145C1 - Method and device for adaptive automatic voltage regulation in an electrical network using capacitor devices - Google Patents

Abstract

FIELD: electric power industry.

SUBSTANCE: invention relates to the field of electric power industry. In the method for adaptive automatic voltage regulation in an electrical network using capacitor devices, the actual voltage deviations by phases for all consumers and at other points of the network are controlled, the ratio between these deviations and the deviation at the installation point of the capacitor devices is determined, compared with a given ratio, and based on this, a correction signal for voltage regulation by means of phase-by-phase connection and regulation of capacitance of capacitor devices.

EFFECT: improving the quality of electricity supplied to consumers by reducing voltage asymmetry in the network.

2 cl, 1 dwg

Description

The invention relates to the automation of electrical networks and is intended to automate voltage regulation in an electrical network using capacitor devices and taking into account phase voltages at control points of a power line.

A known method of automatic voltage regulation, which consists in setting the ratio between the voltage at the nearest and most remote consumers receiving power from the outgoing lines of the electrical substation, where voltage is regulated, and the voltage of the secondary winding of the transformer of the electrical substation, measuring the actual voltage at the nearest and the most remote consumers, measure the actual voltage of the secondary winding of the transformer, compare them with the standard values, if the actual voltage at the consumers differs from the standard values, the actual deviation of the ratio between the given and actual voltages at the control points is determined, the resulting voltage deviation is used as the specified corrective signal. (Patent No. 2527479, Russian Federation, IPC H02J 3/12 (2006.01), publ. 10.09.2014 Bull. No. 25).

A device is known that implements a method for automatic voltage regulation, containing communication and data transmission devices, a control system, voltage sensors and performing voltage regulation taking into account the corrective signal obtained on the basis of measuring voltage at different points of the electrical network (Patent No. 2527479, Russian Federation, IPC H02J 3/12 (2006.01), published on September 10, 2014 Bull. No. 25).

The closest in technical essence to the proposed invention is a method for automatic regulation of voltage in an electric network with a delay in the start of regulation, which consists in changing the transformation ratio of the transformer depending on the corrective signal based on the received actual voltage data from consumers, in which the ratio between the actual deviation voltage from the standard value for all consumers connected to the electrical network in which voltage regulation is carried out, and the voltage of the secondary winding of the transformer or booster transformer mountain, from which the electrical network is powered, in which voltage regulation is carried out, set the time delay of the actual relationship between the voltage deviation from the standard value for all consumers and the voltage of the secondary winding of the transformer or booster transformer from a given ratio, measure the actual voltage for all consumers connected to the electrical network in which voltage is regulated, determine the actual deviation of the measured voltage from the standard value for all consumers, measure the actual voltage of the secondary winding of the transformer or booster transformer, determine the actual ratio between voltage deviations from the standard value for all consumers connected to the electrical network in which voltage regulation is carried out, and the voltage of the secondary winding of the transformer or booster transformer, if this actual ratio differs from the specified ratio after a specified time, start reporting a time equal to the specified time of the actual ratio between the voltage deviation for all consumers, connected to the electrical network in which voltage regulation is carried out, from the standard value and the voltage of the secondary winding of the transformer or voltodo booster transformer from a given ratio and if at the end of the countdown the actual ratio between the voltage deviation from the standard value for all consumers connected to the electrical network in which voltage is regulated and the voltage of the secondary winding of the transformer or booster transformer deviates from the specified ratio, then the resulting the value of this deviation is used as a corrective signal. [Patent RU 2 588 225 C1, class. H02J 3/12 published 06/27/2016. Bull. No. 18].

The closest in technical essence is a device that implements a method for automatic regulation of voltage in an electric network with a delay in the start of regulation, containing communication and data transmission devices, a control system, voltage sensors and performing voltage regulation taking into account the corrective signal obtained on the basis of voltage measurement in for all consumers and at the transformer substation [Patent RU 2 588 225 C1, class. H02J 3/12 published 06/27/2016. Bull. No. 18].

The closest in technical essence is a device that implements a method for automatic regulation of voltage in an electric network using an electric power storage device, containing communication and data transmission devices, a switching device for an electric power storage device, a control and monitoring system for an electric power storage device, voltage sensors, a current sensor, an electric power storage device, a converter drive, and performing voltage regulation, taking into account the corrective signal obtained on the basis of measuring the voltage at all consumers and at the transformer substation [Patent No. 2767517 C1 Russian Federation, IPC H02J 3/12, H02J 5/00. publ. 03/17/2022]

The disadvantage of this method and device is the lack of functionality, which consists in the fact that the voltage regulation in it is carried out by changing the transformation ratio of the transformer or booster transformer, which does not allow for phase-by-phase voltage regulation by means of a phase-by-phase change in capacitance, the capacitor device does not take into account the values of phase voltages in point of installation of the capacitor device and phase voltages at other control points of the electrical network.

The technical objective of the proposed method and device is to expand its functionality by phase-by-phase voltage regulation by connecting and phase-by-phase changing the capacitance of capacitor devices, taking into account the value of phase voltages at the point of installation of capacitor devices and phase voltages at other control points of the electrical network.

To solve this problem, in the proposed method for automatic voltage regulation in an electric network using capacitor devices, which consists in the implementation of voltage regulation depending on the corrective signal, according to the invention, the ratio between the phase voltage deviation at the control points of the power line, on which voltage regulation is carried out and voltage at the point of installation of capacitor devices that carry out regulation, measure the actual phase voltages at the control points of the power line and the voltage at the point of installation of capacitor devices, measure the time of their deviation, compare them with the standard values, if the specified value of the deviation time is less than the actual deviation time voltage and there are deviations of the actual voltages at the control points of the power line down from the standard values, determine the actual deviation of the ratio m Between the deviations of the actual phase voltages at the control points and the voltage at the installation point of the capacitor devices that carry out the regulation, the resulting deviation of the ratio is used as a corrective signal, taking it into account, phase-by-phase regulation is carried out by connecting and changing the capacitance of the capacitor devices with a given time delay, if not available deviations of the actual voltages at the control points of the power line down from the standard values, the capacitor devices are turned off, they control the current in the line at the point of installation of the capacitor devices, and when a short circuit current appears in the line, the capacitor devices are disconnected from the network.

The technical result is also achieved by the fact that the proposed device for automatic voltage regulation in an electrical network using capacitor devices, including voltage sensors and a control system, according to the invention, contains capacitor devices that regulate voltage connected to the electrical network through a switching device for capacitor devices, voltage sensors, installed at the inputs of consumers, connected to the electrical network at the inputs of consumers and monitoring the voltage at the point of their installation and connected using built-in means of communication via a communication channel with the control and monitoring system of capacitor devices, transmitting information about the voltage value at the points of their installation, voltage sensor installed at the point of connection of capacitor devices to the electrical network, connected to the electrical network at the point of connection of capacitor devices and monitoring the voltage in point of its installation and connected to the control and monitoring system of capacitor devices, transmitting to it information about the voltage value at the point of its installation, a current sensor installed in the electrical network at the point of connection of capacitor devices to it and performing phase-by-phase current control in the electrical network at its point installation and connected to the electrical network and the control and monitoring system of capacitor devices, the control and monitoring system of the capacitor device, connected to the capacitor devices, the switching device of capacitor devices, voltage sensors and current sensor and collecting information, including using built-in means of communication with using a communication channel, from voltage and current sensors, with capacitor devices, a switching device for capacitor devices, processing the received information, generating control commands for capacitor devices, a switching device for capacitor devices.

The essence of the invention is illustrated by the drawing, which shows a block diagram of a device for adaptive automatic voltage regulation in an electrical network using capacitor devices.

The scheme contains the following elements: 1 - power transformer of the substation (T1); 2 - protective switching device of the power line (ЗКА2); 3 - single-phase consumer (P3); 4 - single-phase consumer (P4); 5 - single-phase consumer (P5); 6 - single-phase consumer (P6); 7 - three-phase consumer (P7); 8 - single-phase consumer (P8); 9 - voltage sensor (DN9); 10 - voltage sensor (DN10); 11 - voltage sensor (DN11); 12 - voltage sensor (DN12); 13 - voltage sensor (DN13); 14 - voltage sensor (DN14); 15 - voltage sensor (DN15); 16 - current sensor (DT16); 17 - control and monitoring system for capacitor devices (SUiKKUP); 18 - capacitor device (KU18); 19 - switching device of the capacitor device (UKKU19); 20 - Communication channel (Communication channel 20); 21 - short circuit point (K21).

T1 is installed in the electrical network and connected to ZKA2. Consumers P3-P8 are connected to the power circuit after ZKA2. DN9 is installed at the input of the consumer P3 and transmits data on the voltage value through the Communication Channel 20 to the SUiKKUP using built-in communication facilities. DN10 is installed at the input of the consumer P4 and transmits data on the voltage value through the Communication Channel 20 to the SUiKKUP using built-in communication facilities. DN11 is installed at the P5 input and transmits data on the voltage value through the Communication Channel 20 to the SUiKKUP using built-in communication facilities. DN12 is installed at the P6 input and transmits data on the voltage value through the Communication Channel 20 to the SUiKKUP using built-in communication facilities. DN13 is installed at the P7 input and transmits data on the voltage value through the Communication Channel 20 to the SUiKKUP using built-in communication facilities. DN14 is installed at the P8 input and transmits data on the voltage value through the Communication Channel 20 to the SUiKKUP using built-in communication facilities. DN15 is installed at the KU18 input and transmits data on the voltage value to the SUiKKUP through the connection or communication channel 20. DT16 is connected to the power circuits of the electrical network at the connection point of the KU18 and transmits data on the current value through the connection, or Communication channel 20 to the SUiKKUP. KU18 is connected to the electrical network after ZKL2 at a certain point through UKKU19. UKKU19 is installed in the power circuit at the point of connection of KU18 to the power circuits of the electrical network and performs phase switching of the circuit for connecting capacitor devices. SUiKKUP, all voltage sensors (through communication channel 20, or through a connection) and current sensor DT16 through communication channel 20, or through a connection. It also collects information, including using built-in communication tools using communication channel 20, from voltage and current sensors, from capacitor devices, a switching device for a capacitor device, processes the information received, generates control commands for KU18, a switching device for a capacitor device UKKU19.

The method of automatic regulation of voltage in the electrical network using a capacitor device is carried out as follows using the proposed device.

Consumers P3-P8 of the electrical network are supplied through a power transformer T1 and a protective switching device ZKA2, while voltage sensors DN9-DN14 monitor phase voltages at the points of connection of consumers P3-P8 to the electrical network and transmit digitally data on the values of phase voltages through Communication channel 20 to the control and monitoring system of the SUiKKUP capacitor unit, which processes these data, identifies points in the electrical network at which voltage deviations that do not correspond to the specified ones have occurred, detects disappearances, interruptions, voltage distortions, voltage asymmetry, and also generates a corrective signal based on comparing data with DN9-DN14 and data from the DN15 sensor, which transmits data on the values of phase voltages at the point of connection of KU18 to the electrical network.

In case of deviation of the actual voltages at the control points of the electrical network (information from voltage sensors DN9-DP15) down from the standard values, SUiKKUP determines the actual deviation of the ratio between the deviations of the actual phase voltages at the P3-P8 inputs controlled by DN9-DN14, and the voltage at the point of installation of capacitor devices, controlled by DN15; and then uses the resulting deviation of the ratio as a corrective signal and, taking it into account, performs a phase-by-phase connection and a change in the capacitance of KU18 through UKKU19 to regulate the voltage in the phases of the electrical network and reduce the degree of load asymmetry from KU18 with a given output delay in time.

If the SUiKKUP, based on data from DN9-DN15, does not detect deviations of the actual voltages at the control points of the electric network down from the standard values, then the SUiKKUP will transmit a signal to KU18 and the capacitor devices are disconnected from the network.

DT16 monitors the values of currents flowing through the phases of the electrical network at the installation point of KU18 and transmits data about them to the SUiKKUP. In the event of emergency operation of the electrical network, for example, a short circuit at point K21, DT16 records the short circuit current and transmits the relevant data to the SUiKKUP. At the same time, the SUiKKUP will generate a command to disconnect the KU18 from the electrical network by turning off the UKKU19.

The application of the proposed method and device provides automatic phase-by-phase voltage regulation in the electric network using capacitor devices based on information about the actual voltage deviations in phases for all consumers and at other network points, thereby reducing the voltage unbalance in the network, improving the quality of electricity supplied to consumers .

Claims (2)

1. A method for adaptive automatic voltage regulation in an electrical network using capacitor devices, which consists in the implementation of voltage regulation depending on the corrective signal, characterized in that the ratio between the phase voltage deviation at the control points of the power line, on which voltage regulation is carried out, and the voltage at the point of installation of capacitor devices that carry out regulation, they measure the actual phase voltages at the control points of the power line and the voltage at the point of installation of capacitor devices, measure the time of their deviation, compare them with the standard values, if the specified value of the deviation time is less than the time of the actual voltage deviation and there are deviations of the actual voltages at the control points of the power line down from the standard values, determine the actual deviation of the ratio between the deviations of the actual phase voltages at control points and voltage at the point of installation of capacitor devices that carry out regulation, the resulting deviation of the ratio is used as a corrective signal, taking it into account, phase-by-phase regulation is carried out by connecting and changing the capacitance of capacitor devices with a given time delay, if there are no deviations of the actual voltages at the control points of the power line below the standard values, the capacitor devices are turned off, they control the current in the line at the installation point of the capacitor devices, and when a short circuit current appears in the line, the capacitor devices are disconnected from the network. 2. A device for adaptive automatic voltage regulation in an electrical network using capacitor devices, including voltage sensors and a control system, characterized in that capacitor devices are introduced that regulate voltage, connected to the electrical network through a switching device for capacitor devices, voltage sensors installed at the inputs consumers connected to the electrical network at the inputs of consumers and monitoring the voltage at the point of their installation and connected using built-in means of communication via a communication channel with the control and monitoring system of capacitor devices, transmitting information about the voltage value at the points of their installation, a voltage sensor, installed at the point of connection of capacitor devices to the electrical network, connected to the electrical network at the point of connection of capacitor devices and monitoring the voltage at the point of its installation and connected to the system control and monitoring of capacitor devices, transmitting to it information about the voltage value at the point of its installation, a current sensor installed in the electrical network at the point of connection of capacitor devices to it and performing phase-by-phase current control in the electrical network at the point of its installation and connected to the electrical network and a control and monitoring system for capacitor devices, a control and monitoring system for a capacitor device connected to capacitor devices, a switching device for capacitor devices, voltage sensors and a current sensor and collecting information, including using built-in communication tools using a communication channel, from voltage sensors and current, with capacitor devices, a switching device for capacitor devices, processing the received information, generating commands for controlling capacitor devices, a switching device for capacitor devices.

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