RU26870U1 - DEVICE FOR VOLTAGE AND REACTIVE POWER REGULATION - Google Patents

Abstract

1. Device for regulating voltage and reactive power, comprising reactor sections equipped with switches connected to substation buses through a step-down power transformer (autotransformer) with high and low voltage windings, control unit for switches, reactive power (current) and voltage sensors, characterized in that the step-down power transformer (autotransformer) is equipped with a medium voltage winding (output) and a tap switch, the first and second control units are introduced, the inputs of which x sensor connected to the reactive power (current) and the voltage sensor, and outputs - to switch taps and switches to the control unit, respectively, wherein the sensors are mounted on the sides of the middle and high-voltage power transformer (autotransformer) .2. The device according to claim 1, characterized in that the control units are interconnected by a coordinating relationship.

Description

DEVICE FOR REGULATED VOLTAGE AND REACTIVE POWER

Region-sst TexHMKii

The Pilean model relates to the field of electric power industry, and, in particular, to devices for regulating voltage and reactive power when controlling power rails of electric networks. It can find application, for example, at substations, 330 and 500 kV for regulating the voltage in the network by appropriate compensation of reactive power.

State of the art

A device is known for regulating the voltage on substation buses, which contains a voltage sensor and a CPR transformer with a switch of solders C. However, its functional capabilities are insufficient for effective voltage regulation in cases where electric networks are connected to voltage sources through a power transformer, i.e. . cross-reactive power between networks affects the magnitude of the regulated voltage.

It is known, adopted for the prototype, a device for regulating reactive power, containing equipped with switches

Reactor reactors connected to the substation buses via a step-down power transformer with HIGH and low voltage windings, circuit breaker control unit, reactive power sensor () and voltage sensor 3.

The prototype device compensates for reactive power, however, and its functionality is insufficient to effectively regulate the voltage when yielding the connection of electrical circuits to voltage sources through a power transformer. The objective of the utility model is to expand the functional capabilities of the device for effective voltage regulation by implementing an independent or coordinated switching of p; aK reactor ssch1Y and power transformer (autotransformer) solders.

Disclosure of Invention

The subject of a utility model is a device for regulating voltage and reactive power, content; a tash, its reactor sections equipped with switches, connected to a substation via a step-down power transformer (autotransformer) with high and low voltage winding, control circuit breakers, reactive sensors ( current) and voltage, which, according to the utility model, differs in that, having understood hell, the power transformer (autotransformer) is equipped with a medium voltage winding (output) and a solder switch , the first and second control units are introduced, the inputs of which are connected to the sensor at reactive power (current) and the voltage sensor, and the outputs are connected to the solder switch and to the control unit by switches, respectively, while the sensors are installed on the sides of medium and high voltage power transformer (autotransformer).

The set of 1 signs indicated extends the functionality of the device, providing effective regulation of n-voltage in the presence of an electrical connection: networks through a juice transformer (automatic transformer).

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The utility model has a development consisting in the fact that the control units are interconnected by a coordinated communication.

This allows you to optimize the regulatory process.

Brief Description of the Drawings

The utility model is illustrated in FIG. 1, where shown, a block diagram of the proposed device, taking into account its development.

Description of Utility Model Implementation

The device of FIG. L contains:

I- lowering1-1Y power transformer with high windings,

medium and low voltage (instead of a transformer, an autotransformer with appropriate conclusions can be used); S - sensor (measuring transformer) reactive power (current);

3- first control unit;

4- re-sharpener of solders;

5i b - reactor sections, 7 and 8 - switches;

9- voltage sensor (measuring transformer);

10- second control unit;

II- control unit for switches 7 and 8;

12 - coordinating communication between blocks 3 and 10.

Figure 1 also shows:

LV, OH and VN - busbars (low, medium and high voltage, respectively) of the substation on which the proposed device is installed, connected to the corresponding windings (sides)

transformer 1;

E1 and XI are equivalent emfs and inductive resistance of the HV electrical network;

E and X are the equivalent emfs and inductive reactance of the electrical network of CH;

Just. and Ost.- settings (set values) of voltage and reactive power flow, respectively.

Based on the control modes characteristic of a particular substation, the reactive power sensor (s) and voltage sensor 9 can be installed on the medium side and on the high voltage side (CH and HV), respectively, or vice versa. In FIG. 1 installation of sensors is shown in accordance with one of the WHO.

The device operates as follows.

When the voltage on the VN buses changes, block 10, which monitors this voltage with sensor 9, gives a signal to block 11 about the deviation of voltage from the set point. Block 11, controlling the circuit breakers 7 and 8, connects to the LV bus necessary to restore the n-voltage. The number of reactor sections 5, 6.

Block 3, which controls the reactive power (current) on the CH side of transformer 1 with a sensor S, sends a signal to block 4 about the deviation of reactive power from the Oust setting. Block 4 carries out the corresponding switching of the solderings of the transformer 1, as a result of which a predetermined value of reactive power transfer between the bus, 1 VN and MV is set.

In the case of establishing zero flow of reactive fraud on the CH side, the range of voltage regulation on the HV bus by switching the reactor sections will be maximum, because the load of the reactor sections will be passed through the transformer 1 only to the HV buses. When maintaining by switching off the solderings of a given flow of reactive scree, OTLR-SHOGO from zero, the load

The reactor sections will be distributed between the HV and UH buses, affecting the high and medium voltage levels. In the extreme case, when the reactive power flow is set equal to zero on the HV side, the voltage on the SC side will be regulated by switching the reactor sections.

To adapt the device circuit to the characteristic for the given substation mode of regulation l, the sensor 2 can be switched to the HV side, and the sensor 9 to the OH side,

Communication 12 between blocks 3 and 10 is used to coordinate the regulatory processes carried out by these blocks (for example, to establish the priority of regulation).

Sources of information.

1.A.B. Barzam. System Automation. Energoatomizdat, 1989, pp. 87-89.

2. Utility Model Certificate No. 17381, H02J 3/16, 2001.

Claims (2)

1. Device for regulating voltage and reactive power, comprising reactor sections equipped with switches connected to substation buses through a step-down power transformer (autotransformer) with high and low voltage windings, control unit for switches, reactive power (current) and voltage sensors, characterized in that the step-down power transformer (autotransformer) is equipped with a medium voltage winding (output) and a tap switch, the first and second control units are introduced, the inputs of which x sensor connected to the reactive power (current) and the voltage sensor, and outputs - to switch taps and switches to the control unit, respectively, wherein the sensors are mounted on the sides of the middle and high-voltage power transformer (autotransformer). 2. The device according to claim 1, characterized in that the control units are interconnected by a coordinating relationship.