RU2482588C1 - Device to generate synchronised data on power unit condition - Google Patents

Abstract

FIELD: electricity.

SUBSTANCE: device (1) comprises a unit (2) for calculation of phase vectors of voltage and current, an output communication interface (3), a unit (4) of analogue-digital conversion (ADC), equipped with analogue measuring interfaces (5) and (6) of voltage and current, a unit (7) for reception of signals of calendar synchronisation, a unit (8) for generation of an internal digital flow, equipped with an input (9) of reception of clock synchronisation signals. Besides, the device comprises a unit (10) of reception of digital flows, a unit (11) for generation of output data, a unit of (12) discrete-digital conversion, equipped with interfaces (13) of discrete input. The unit (10) of reception of digital flows is made in the form of a unit (14) of communications redundancy equipped with interfaces (15) of reception of digital flows. The following components are connected to inputs of the unit (2) for calculation of phase vectors: the output of the unit (4) of ADC via the unit (8) for generation of an inner digital flow, the output of the unit (7) of reception of calendar synchronisation signals and the output of the unit (10) of reception of digital flows.

EFFECT: expansion of functional capabilities and increased reliability.

2 cl, 1 dwg

Description

Technical field

The invention relates to devices for obtaining data on the state of an energy object tied to a single time scale, including vector parameters of currents and voltages, and can be used, for example, in automation systems of electrical substations.

State of the art

The known terminal RES 521 from the manufacturer ABB [1], which provides measurements of phase vectors of current and voltage and the issuance of measurement data of phase vectors to external systems via an external digital interface using the IEEE C37.118 protocol. The terminal includes:

- block of analog inputs, including interfaces for connecting to analog secondary measuring current and voltage circuits, analog-to-digital converters;

- a block for receiving calendar synchronization signals;

- a computing module that includes a central processor that provides the basic measuring and computing functions of the terminal, and a digital Ethernet communication interface for outputting phase vector measurement data to external systems.

A device for vector measurements [2], which provides the measurement of the phase voltage vector and the transmission of measurement data of the phase voltage vector to another similar device installed on another section of the bus. The device includes:

- block analog-to-digital conversion;

- voltage measurement unit;

- frequency calculation unit;

- unit for calculating the effective value of the phase voltage;

- unit for calculating the phase voltage vector;

- unit for transmitting measurement data of the phase voltage vector to an external device.

A disadvantage of both known devices is the lack of versatility with respect to the shape of the measurement data. These devices have the ability to calculate phase vectors from measured analog values, but are not able to determine these vectors from data transmitted in the form of digital streams, for example, via a digital substation process bus. In addition, the data generated by the known devices do not fully provide the protection and automation systems with the necessary information about the state of the power facility at any given time.

Disclosure of invention

The technical result of the invention is to increase the functionality and reliability of the device, increasing the information content of the data generated by it about the state of the power facility.

The above technical result is achieved due to the fact that the device containing the phase vector calculation unit, the output communication interface, the analog-to-digital conversion unit equipped with analog voltage and current measurement interfaces, the calendar synchronization signal receiving unit, the internal digital stream generating unit equipped with clock synchronization signal input, digital stream receiving unit, output data generating unit, digital-digital conversion unit equipped with discrete input interfaces and an input connected to the output of the calendar synchronization signal receiving unit, while the phase vector calculation unit is equipped with three inputs, the first of which is connected to the output of the analog-to-digital conversion unit through the internal digital stream generation unit, and the second to the output a calendar synchronization signal receiving unit, the third to the output of the digital stream receiving unit, the output communication interface is connected to the output of the phase vector calculation unit through the unit generating output data, to which the output of the digital-to-digital conversion unit is connected, and the digital stream receiving unit is made in the form of a communication backup unit equipped with at least two digital stream receiving interfaces.

The invention has a development consisting in the fact that the block for receiving calendar synchronization signals can be made in the form of a block for maintaining the calendar time, equipped with a calendar synchronization interface. At the same time, the device allows for the binding of discrete signals about the state of the energy object and the calculated values of the phase vectors of voltage and current to the calendar time with less dependence on the regularity of the device receiving the calendar synchronization signal from an external source. Reducing the dependence of the correct functioning of the device on the availability of an external source of calendar synchronization signals additionally increases the reliability of issuing correct data on the state of an energy object to external systems.

Brief Description of the Drawings

Figure 1 shows a diagram of the proposed device, taking into account the development of the invention.

The implementation of the invention in view of its development

Figure 1 shows the device 1, which includes:

- block 2 calculating the phase vectors of voltage and current;

- output communication interface 3;

- block 4 analog-to-digital conversion, equipped with analog measuring interfaces voltage 5 and current 6;

- block 7 receiving signals of calendar synchronization;

- block 8 forming the internal digital stream;

- input 9 receiving signals of clock synchronization;

- block 10 receiving digital streams;

- block 11 forming the output data,

- block 12 digital-to-digital conversion;

- discrete input interfaces 13;

- block 14 communication backup;

- interfaces 15 receiving digital streams.

In the particular case of the device 1, the block 7 for receiving calendar synchronization signals can be made in the form of a block 16 for maintaining the calendar time, equipped with an interface 17 for calendar synchronization.

The device operates as follows.

The analog voltage and current signals in the secondary voltage and current measuring circuits through the interfaces 5 and 6 are sent to the analog-to-digital conversion unit 4, where the values of these signals are converted into a digital representation, and then transferred to the internal digital stream generating unit 8. Block 8 provides the formation of an internal digital stream containing data on the measured values of voltage and current, with a given sampling rate with reference to each individual value of voltage or current in the digital stream to time using clock synchronization signals received through input 9.

Block 10 receives digital streams with data from primary measurements of current and voltage.

Block 2 calculates the phase vectors of voltage and current based on the internal digital stream received from block 8, and based on the external digital stream received by the device through block 10. When calculating the phase vectors of voltage and current, block 2 binds the calculated values of the phase vectors to the calendar time based on the calendar synchronization signals continuously received by block 2 from block 7, which in turn ensures the reception of calendar synchronization signals from an external source ka. The calculated values of the phase vectors of voltage and current are transmitted by block 2 to the output communication interface 3.

Discrete input signals via discrete input interfaces 13 are supplied to a digital-digital conversion unit 12, where these signals are converted to a digital representation, and these signals are linked to the time received from the calendar time maintenance block 17. Converted into digital form, discrete signals associated with the calendar time, are transmitted to the block 11 of the formation of the output data. Along with this, block 11 translates the values of the phase vectors calculated by block 2 in the form of pairs of digital values of the phase vectors of voltage and current related to the same moment of the calendar time. Block 11 adds to each pair of block values received from block 2 the vectors related to one moment of the calendar time, the values of discrete signals received from block 12 and related to the same moment of the calendar time as the values of the phase vectors in the pair. The resulting data packet, which includes the magnitude of the phase vectors of voltage and current and the values of discrete signals related to the same time, is transmitted by block 11 to the output communication interface 3.

Block 10 receiving digital streams is made in the form of block 14 communication backup, to the inputs of which are connected interfaces 15 receiving digital streams. Interfaces 15 provide reception of digital streams with data of primary measurements of current and voltage. If there is a digital stream at the input of one of the interfaces 15, conditionally selected as the main interface, block 10 transmits the specified stream to block 2 for calculating the phase vectors of voltage and current. In the event of a loss of the digital stream at the input of the main interface 15, the unit 10 switches to receiving the digital stream through another interface 15, considered as a backup interface, and provides the broadcast of the specified stream to the block 2.

As can be seen from the foregoing, the present invention enables the device to operate both in “digital substations” [3] with a redundant digital process bus [4], and in traditional substations without a digital process bus. At the same time, the device generates a highly informative data package tied to a single calendar time about current and voltage vectors, the values of which are received by the device in analog and / or digital form, and about discrete signals, which, in particular, can reflect the position of switching devices of an energy object at the time of measurement of these vectors.

Information sources

1. ABB Powers Technologies AB. Phasor measurement terminal RES 521. Technical reference manual. September 2008, Revision: D. (Technical Reference Guide for the Vector Measurement Terminal RES 521). www.abb.com/substationavtomation.

2. Published US patent application No. 2010/0072978, IPC G01R 23/02, 2010

3. "Digital substation UNEG" / Morzhin Yu.I. et al., EnergyExpert Magazine, No. 4 (27), 2011

4. “Process bus - the technological foundation of a digital substation” / M. Vlasov et al. Magazine “Relayshchik”, No. 1, March 2010

Claims (2)

1. A device for generating synchronized data on the state of an energy object, comprising a phase vector calculation unit, an output communication interface, an analog-to-digital conversion unit equipped with analog voltage and current measurement interfaces, a calendar synchronization signal receiving unit, characterized in that an internal digital stream generating unit is introduced equipped with an input for receiving clock synchronization signals, a unit for receiving digital streams, a unit for generating output data, a unit for discrete digital conversion, equipped with discrete input interfaces and an input connected to the output of the calendar synchronization signal receiving unit, while the phase vector calculation unit is equipped with three inputs, the first of which is connected to the output of the analog-to-digital conversion unit through the internal digital stream generating unit, the second to the output of the calendar synchronization signal receiving unit, the third - to the output of the digital stream receiving unit, the output communication interface is connected to the output of the phase calculation unit x vectors through the block forming the data output connected to the output of the block of discrete-digital conversion and digital streams receiving unit is designed as a backup communication unit provided with at least two interfaces for receiving digital streams. 2. The device according to claim 1, characterized in that the unit for receiving calendar synchronization signals is made in the form of a unit for maintaining calendar time, equipped with a calendar synchronization interface.