RU225949U1 - DEVICE FOR REGULATING THE STATIC REACTIVE POWER COMPENSATOR AT THE CONTACT NETWORK SECTIONATION POST - Google Patents

Abstract

The utility model relates to electrified railway transport, namely to AC traction power supply systems containing contact network sectioning posts with single-phase adjustable means of compensation (static compensators and generators) of reactive power. The purpose of the utility model is to increase the operational reliability and energy efficiency of alternating current traction power supply systems containing a sectioning post for a contact network with static compensators or reactive power generators. The proposed device makes it possible to increase the reliability and energy efficiency of the AC traction power supply system by increasing the reliability of power supply and regulating the operating characteristics of the static reactive power compensator (generator) based on measuring voltage and currents on the buses of adjacent traction substations and the sectioning station. The technical result is ensured by regulating the operating characteristics of the static compensator (generator) of reactive power based on data from one of two measurement channels (from adjacent traction substations and measurements at the sectioning station), while the first channel is the main one, which increases the accuracy of measurements and reliability of operation and the level of energy efficiency of the traction power supply system. The advantage of the proposed device is the presence of two channels of measurement data for regulation, based on data transmission from adjacent traction substations and the sectioning station, which makes it possible to increase the accuracy of regulation and the reliability of the operation of the static compensator (generator) of reactive power at the sectioning station of the contact network.

Description

The utility model relates to electrified railway transport, namely to AC traction power supply systems containing contact network sectioning posts with single-phase adjustable means of compensation (static compensators and generators) of reactive power.

The purpose of the utility model is to increase the operational reliability and energy efficiency of alternating current traction power supply systems containing a sectioning post for a contact network with static compensators or reactive power generators.

The proposed device makes it possible to increase the reliability and energy efficiency of the AC traction power supply system by increasing the reliability of power supply and regulating the operating characteristics of the static reactive power compensator (generator) based on measuring voltage and currents on the buses of adjacent traction substations and the sectioning station.

Measuring currents and voltages on the buses of adjacent traction substations makes it possible to determine the reactance (conductivity) of the traction load and the load current of the substations to regulate the operation of the static compensator (generator) at the sectioning station of the contact network.

Measuring the voltage on the busbars of the sectioning station in the control device, taking into account the sign of the presence of a traction load, allows you to adjust the operating characteristic of the static reactive power compensator (generator) in order to match the characteristics with the external characteristics of adjacent traction substations. However, this method of measuring voltage is indirect. To increase the accuracy of regulation of the operation of the static compensator (generator) at the sectioning station, it is proposed to use measurement data at traction substations transmitted using telemechanics devices to the sectioning station.

Devices for measuring current and voltage with different equipment composition are known. The disadvantage of these devices is the inability to measure currents, voltages and resistance (conductivity) of the traction load of adjacent traction substations, simultaneous control of the sum of currents flowing through the traction network, and the higher harmonic components of the current due to the operating modes of the traction power supply system and electric rolling stock.

A device for measuring voltage at an active AC sectioning station is known [1], containing an adjustable device for reactive power compensation and energy storage, current and voltage transformers, analog-to-digital converters, a block of discrete inputs and outputs, a signal conversion block, a control and regulation block.

The disadvantages of this device are the inability to regulate the load data of adjacent traction substations.

The closest technical solution (prototype) is a device for controlling the static reactive power compensator at the sectioning station.

In the prototype, the technical result of measuring voltage in no-load mode is ensured by monitoring the voltage level and coefficients of harmonic components, which make it possible to determine the no-load mode of the inter-substation zone.

The disadvantages of this device are the inability to regulate the load data of adjacent traction substations.

Regulation of reactive power in static compensators (generators) connected to the buses of the sectioning posts of the AC contact network is carried out according to the voltage level, which is measured using measuring voltage transformers connected to the buses of the sectioning post.

The voltage level that determines the operating mode of the static reactive power compensator (generator) is set based on averaged data on the voltage level at adjacent traction substations, the parameters of the traction network and the load of electric rolling stock in the intersubstation zone under consideration.

The voltage setting (reference voltage) at the sectioning station allows you to determine the nature of the power of the static compensator (generator) - capacitive or inductive depending on the voltage level - and changes if the voltage level at the traction substations deviates from the nominal values.

The deviation of the voltage on the substation buses from the nominal values depends on the operating mode of the traction substations and the external power supply system in forced or normal modes (with minimal load), and the voltage may differ significantly from the nominal level. Voltage regulation at AC traction substations is usually carried out using load regulation and power reserve devices and is discrete in nature. In this case, the operating modes of the static compensator (generator) are determined by the voltage level on the busbars of the sectioning station and do not change when the voltage levels on the busbars of adjacent substations deviate from the calculated ones. The specified conditions determine the degree of reactive power overcompensation associated with the generation of capacitive load exceeding the inductive traction load within the boundaries of intersubstation zones.

The proposed device makes it possible to implement two channels for transmitting measurement data for regulation. The first (main) is based on measuring currents, voltages and phase angles between them at adjacent traction substations, the second (backup) is based on measuring currents, voltages and coefficients of harmonic components of the current at the sectioning station.

List of information transmitted via communication line from adjacent traction substations (first channel):

1) connection currents of the contact network of substations supplying the inter-substation zone;

2) voltage on the buses of adjacent substations;

3) phase angle between the current and voltage vectors of substations. The second channel receives the following data from the sectioning station:

1) currents of connections of the contact network of the sectioning post;

2) bus voltage;

3) coefficient of higher harmonic current components.

The presence of two channels for receiving information allows, due to redundancy, to increase the reliability of the static compensator (generator) in the event of failures in the communication line. In case of failures in the communication line, regulation is performed based on data received via the second channel.

The technical result is ensured by regulating the operating characteristics of the static compensator (generator) of reactive power based on data from one of two measurement channels (from adjacent traction substations and measurements at the sectioning station), while the first channel is the main one, which increases the accuracy of measurements and reliability of operation and the level of energy efficiency of the traction power supply system.

The principle of operation of the device is discussed using the example of its implementation. In fig. A diagram of the control device for the static compensator (generator) of reactive power at the overhead contact line sectioning station for a two-track section of the railway (four contact network connections) is shown.

The claimed device consists of current transformers (TT1 - TT4, TT5) - blocks 1-4, 17 (Fig.), voltage transformer (VT) - block 5, connected to the busbars of the sectioning station (SPS) - 16, static compensator (generator) reactive power (STC) - block 6, protection and automation units (TRZA1 - TRZA5) - 7-10, 18, post control cabinet (SHUP) - block 11, control and regulation unit (BKR) - 12, settings block (BU) - 13, current and voltage recording unit (BRTN) - 14, uninterruptible power supply unit (UPS) - 15, telemeasurement unit (BTI) - 19, measurement control unit - 20, selector unit - 21.

Current transformers 1-4, 17 are installed on the connections of the contact network of the AC sectioning station, and voltage transformer 5 is connected to the bus of the sectioning station 16. The secondary windings TT1 - TT4, TT5 1-4, 17 and TN 5 are connected to TRZA1 - TRZA5 (units 7-10, 18). Outputs TRP1 - TRP5 (7 - 10, 18) are connected to the SHUP input (11), the output of which is connected to the BKR input (12). BKR (12) has two outputs (two channels) connected to the input of the BS (21), the output of which is connected to the BRTN (14). The BRTN output (14) is connected to the STK input (6) and is intended to regulate its operating characteristics.

To increase the reliability of power supply, blocks TRZA 1-5 (7-10, 18), SHUP (11), BKR (12), BU (13), BRTN (14), BTI (19), BKI (20) and BS (21 ) are connected to the BPS (15).

The operation of the proposed device is carried out as follows. Measurement data from traction substations comes from the communication line (LC) to the BTI (19), then from which to the input of the BKR (12), which has two channels of measurement data (from the LC and from the measuring transformers of the sectioning station). If the measurement data from the LS is complete, the BS block (21) transmits the control data of the first channel to the BRTN block (14). In the absence or incompleteness of measurement data on the first channel, controlled by the BKI block (20), the BS block (21) provides regulation based on data received through the second channel based on measurement data at the sectioning post. When measurement data appears in the LAN, the BS block (21) switches to the first channel to regulate the static compensator (generator) of reactive power.

The advantage of the proposed device is the presence of two channels of measurement data for regulation, based on data transmission from adjacent traction substations and the sectioning station, which makes it possible to increase the accuracy of regulation and the reliability of the operation of the static compensator (generator) of reactive power at the sectioning station of the contact network.

Bibliography

1. Pat. RU (11) 210055 (13) U1 MPK V60M 7/00. Voltage measuring device at the active AC sectioning station / V.L. Nezevak, S.S. Samolinov, O.A. Sidorov. No. 2021129652; Declared: 10/11/2021; Published: 03/25/2022. Bull. No. 9.

2. Pat. RU (11) 218476 (13) U1 MPK V60M 3/02. Control device for the static reactive power compensator at the sectioning station / V.L. Nezevak, M.M. Nikiforov, S.S. Samolinov. No. 2022134001; Declared: 12/22/2022; Published: 05/29/2023. Bull. No. 16.

Claims (1)

A device for regulating a static reactive power compensator at a sectionalization post of a contact network, containing current and voltage transformers, control and regulation units, settings, registration of currents and voltages, control of the sectionalization post, uninterruptible power supply, relay protection and automation, characterized in that it additionally contains telemetering units , measurement control and selector connected to the mentioned uninterruptible power supply unit, the input of the telemeasurement unit is connected to the communication line, and the outputs are to the measurement control unit and the mentioned control and regulation unit, the output of the measurement control unit is connected to the input of the selector unit, two outputs of the control unit and regulation are connected to the input of the selector block, the output of which is connected to the mentioned current and voltage recording block.

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