CN111509717A - Synchronous phasor measurement control device and system for power distribution network - Google Patents
Synchronous phasor measurement control device and system for power distribution network Download PDFInfo
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R19/00—Arrangements for measuring currents or voltages or for indicating presence or sign thereof
- G01R19/25—Arrangements for measuring currents or voltages or for indicating presence or sign thereof using digital measurement techniques
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J13/00—Circuit arrangements for providing remote indication of network conditions, e.g. an instantaneous record of the open or closed condition of each circuitbreaker in the network; Circuit arrangements for providing remote control of switching means in a power distribution network, e.g. switching in and out of current consumers by using a pulse code signal carried by the network
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E40/00—Technologies for an efficient electrical power generation, transmission or distribution
- Y02E40/70—Smart grids as climate change mitigation technology in the energy generation sector
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y04—INFORMATION OR COMMUNICATION TECHNOLOGIES HAVING AN IMPACT ON OTHER TECHNOLOGY AREAS
- Y04S—SYSTEMS INTEGRATING TECHNOLOGIES RELATED TO POWER NETWORK OPERATION, COMMUNICATION OR INFORMATION TECHNOLOGIES FOR IMPROVING THE ELECTRICAL POWER GENERATION, TRANSMISSION, DISTRIBUTION, MANAGEMENT OR USAGE, i.e. SMART GRIDS
- Y04S10/00—Systems supporting electrical power generation, transmission or distribution
- Y04S10/22—Flexible AC transmission systems [FACTS] or power factor or reactive power compensating or correcting units
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Abstract
The utility model relates to a distribution network synchronization phasor measurement control device and system, the device is applied to in the distribution network, and it includes: the measurement detection module and the protection detection module respectively obtain a measurement signal and a protection signal by detecting under the time synchronization signal; the switching value acquisition module acquires a switching signal under the time synchronization synchronous signal; the processing control module processes the measurement signals to obtain measurement phasors, processes the protection signals to obtain protection phasors, processes the input signals to obtain input quantities, and drives an output relay in the device according to output data sent by a master station where the power distribution network is located; the data communication module sends the measurement phasor, the protection phasor and the input/output quantity to the master station based on a preset data transmission protocol and receives the output data from the master station. The device and the system provided by the embodiment of the disclosure can effectively detect and control data transmission between the device and the main station, and can effectively improve the supervision level of the power distribution network.
Description
Technical Field
The disclosure relates to the technical field of electric power, in particular to a synchronous phasor measurement control device and system for a power distribution network.
Background
The distribution network is introduced in a large number to wind energy, solar energy and energy trade etc. and more tasks of transmission network have been taken over in the distribution network, for promoting the distribution network supervision level, distribution network wide area monitoring system is given hopefully. A synchronous Phasor Measurement Unit (PMU) is a phasor measurement unit configured by using a Global Positioning System (GPS) second pulse as a synchronous clock. In the related art, aiming at the characteristics of strong transient, high noise, rich inter-harmonic, weak communication and the like of a power distribution network, the accuracy problem of synchronous phasor measurement under the conditions of large-scale distributed power supply, electric vehicle access and interaction between users and a power grid is solved, the problem that how to provide autonomous and controllable synchronous phasor measurement control (phasemeasurement & control unit, hereinafter referred to as distribution network PMC) of the power distribution network becomes urgent to be solved is provided.
Disclosure of Invention
In view of this, the present disclosure provides a synchronous phasor measurement control apparatus and system for a power distribution network.
According to an aspect of the present disclosure, a synchronous phasor measurement control apparatus for a power distribution network is provided, which is applied to the power distribution network, and the apparatus includes:
the measurement detection module is used for detecting a measurement phasor signal of a target line in the power distribution network under the time synchronization synchronous signal to obtain a measurement signal;
the protection detection module is used for carrying out protection phasor signal detection on a target line in the power distribution network under the time synchronization synchronous signal to obtain a protection signal;
the switching value acquisition module is used for carrying out input value acquisition under the time synchronization synchronous signal to obtain an input signal;
the processing control module is used for processing the measurement signals by using a measurement algorithm to obtain measurement phasors, processing the protection signals by using a protection algorithm to obtain protection phasors, isolating, denoising and anti-shaking the input signals to obtain input quantities, and driving an output relay in the device according to output data sent by a master station where the power distribution network is located;
and the data communication module is used for sending the measurement phasor, the protection phasor and the input/output quantity to the master station based on a preset data transmission protocol and receiving the output data from the master station.
In one possible implementation manner, the measurement class detection module includes:
the first current transformer is used for converting the current in the target line into a measurement type current;
a first voltage transformer for converting the voltage in the target line to a measurement-like voltage,
wherein the apparatus further comprises:
the low-pass filter is used for respectively removing high-frequency parts in the measurement type current and the measurement type voltage to obtain filtered measurement type current and filtered measurement type voltage;
and the AD acquisition module is used for respectively carrying out fixed-frequency sampling on the filtered measurement class current and the filtered measurement class voltage under the time synchronization synchronous signal to obtain a measurement class voltage sampling signal and a measurement class current sampling signal, and sending the measurement class voltage sampling signal and the measurement class current sampling signal to the processing control module as the measurement class signal.
In one possible implementation manner, the protection class detection module includes:
the second current transformer is used for converting the current in the target line into a protection current;
a second voltage transformer for converting the voltage in the target line to a protection-type voltage,
the low-pass filter is further configured to remove high-frequency portions of the protection current and the protection voltage, respectively, to obtain a post-filtering protection current and a post-filtering protection voltage;
the AD acquisition module is further configured to perform fixed-frequency sampling on the filtered protection-type current and the filtered protection-type voltage respectively under the time synchronization signal to obtain a protection-type voltage sampling signal and a protection-type current sampling signal, and send the protection-type voltage sampling signal and the protection-type current sampling signal to the processing control module as the protection-type signal.
In one possible implementation, the process control module includes:
the data forwarding sub-module is connected with external equipment through an external interface, and is used for transmitting the data messages sent by the external equipment to the data communication module and/or transmitting the received data messages sent to the external equipment;
the data communication module is used for sending the data to be uploaded to the master station based on the preset data transmission protocol and/or transmitting the transmitted data message from the master station to the data forwarding submodule,
wherein the type of the external interface comprises at least one of the following types: the system comprises a serial peripheral interface SPI, an interface UART integrated with a universal asynchronous receiving and transmitting transmitter and a standard 8-bit modular interface RJ 45.
In one possible implementation, the process control module includes:
the measurement processing submodule is used for processing the measurement signal by using a high-order digital filter, calculating to obtain measurement phasor, filtering the protection phasor by using an anti-aliasing filter and outputting the filtered protection phasor to the data communication module;
and the protection processing submodule is used for processing the protection signals by using a low-order digital filter so as to remove high-frequency components in the protection signals, and then calculating to obtain protection phasors and outputting the protection phasors to the data communication module.
In one possible implementation, the process control module includes:
the opening processing submodule is used for carrying out isolation, denoising and anti-shake processing on the opening signal to obtain an opening amount;
and the output transmission submodule is used for driving an output relay in the device according to output data sent by a main station where the power distribution network is located.
In a possible implementation manner, the open-in processing sub-module is further configured to identify the open-in amount, obtain a sudden open-in amount in which a sudden change occurs when it is determined that the open-in amount has a sudden change, and mark the sudden open-in amount, where the mark includes a timestamp;
the data communication module is further used for sending the marked sudden change opening amount to the master station.
In a possible implementation manner, the fields of the application protocol data frame indicated by the preset data transmission protocol include:
SYNC、FRAMESIZE、IDCODE、NumASDU、ASDU1…ASDUN、CRC，
wherein the SYNC represents a frame SYNC word, the FRAMESIZE represents a number of frame bytes, the IDCODE represents an identification of the apparatus, numsdus represents a number of application service data units contained in a current message, ASDU1 … … ASDUN represents a first application service data unit … … nth application service data unit, and the CRC represents a check byte.
In one possible implementation, the application service data unit includes at least one of: phasor application service data unit, open application service data unit, protocol conversion/encapsulation application service data unit, open application service data unit,
wherein, the fields in the phasor application service data unit include:
ASDU_TAG、ASDUSIZE、SOC、FRACSEC、STAT、PHASORS、FREQ、DRREQ、NALOG，
wherein the ASDU _ TAG represents a label of a corresponding application service data unit, the ASDUSIZE represents an internal byte length of the application service data unit, the SOC is universal seconds, the FRACSEC represents a second division number and a time scale in time quality and phasor data, the STAT represents a status word with a bit corresponding meaning, the PHASORS represents fixed point phasor data of a specified byte, the FREQ represents a frequency offset represented by a fixed point number, the DRREQ represents a frequency change rate represented by the fixed point number, and the NA L OG represents an analog quantity,
the fields opened into the application service data unit include:
ASDU_TAG、ASDUSIZE、SOC FRACSEC、STAT、DIGITAL，
wherein DIGITA L indicates the amount of input,
fields in the protocol conversion/encapsulation application service data unit include:
ASDU_TAG、ASDUSIZE、TRD、MESSAGE，
wherein, the TRD transmission direction includes an uplink transmission or an downlink transmission, the MESSAGE indicates an uplink data MESSAGE or a downlink data MESSAGE to be transmitted,
wherein, the field of the application service data unit comprises:
ASDU_TAG、ASDUSIZE、NoDO、DOVal、DOValN
wherein the NoDO represents a turn-out sequence number, the DOVal represents a turn-out value, and the DOValN represents a turn-out value inversion.
According to another aspect of the present disclosure, a power distribution network synchronized phasor measurement control system is provided, which is applied to a power distribution network, and the system includes: the master station where the power distribution network is located and the synchronous phasor measurement control device of the power distribution network,
and the master station where the power distribution network is located is used for sending out export data, receiving the measurement phasor, the protection phasor and the import quantity from the device, and analyzing and controlling the power distribution network based on the measurement phasor, the protection phasor and the import quantity.
The power distribution network synchronous phasor measurement control device provided by the embodiment of the disclosure has the advantages that the accuracy and reliability of synchronous phasor measurement under the conditions of large-scale distributed power supply, electric automobile access and user and power grid supply and demand interaction are ensured, and the accuracy, the precision and the stability are high and the stability is good aiming at the characteristics of strong transient, high noise, rich inter-harmonic, weak communication and the like of a power distribution network. The device and the main station where the power distribution network is located can effectively carry out detection and control data transmission, and the supervision level of the power distribution network can be effectively improved. The device has measurement and protection phasor measurement at the same time, the measurement phasor can support the master station to complete regional power grid monitoring, and the protection phasor is uploaded to the master station to realize the regional power grid protection function. Meanwhile, the device finishes the acquisition of the input amount under a time synchronization synchronous clock, and the input amount is sent to the master station on a time scale.
Other features and aspects of the present disclosure will become apparent from the following detailed description of exemplary embodiments, which proceeds with reference to the accompanying drawings.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate exemplary embodiments, features, and aspects of the disclosure and, together with the description, serve to explain the principles of the disclosure.
Fig. 1 is a schematic structural diagram of a power distribution network synchronous phasor measurement control apparatus according to an embodiment of the present disclosure.
Fig. 2 is a schematic structural diagram of a power distribution network synchronous phasor measurement control apparatus according to an embodiment of the present disclosure.
Detailed Description
Various exemplary embodiments, features and aspects of the present disclosure will be described in detail below with reference to the accompanying drawings. In the drawings, like reference numbers can indicate functionally identical or similar elements. While the various aspects of the embodiments are presented in drawings, the drawings are not necessarily drawn to scale unless specifically indicated.
The word "exemplary" is used exclusively herein to mean "serving as an example, embodiment, or illustration. Any embodiment described herein as "exemplary" is not necessarily to be construed as preferred or advantageous over other embodiments.
Furthermore, in the following detailed description, numerous specific details are set forth in order to provide a better understanding of the present disclosure. It will be understood by those skilled in the art that the present disclosure may be practiced without some of these specific details. In some instances, methods, means, elements and circuits that are well known to those skilled in the art have not been described in detail so as not to obscure the present disclosure.
Fig. 1 is a schematic structural diagram of a power distribution network synchronous phasor measurement control apparatus according to an embodiment of the present disclosure. As shown in fig. 1, the distribution network synchronous phasor measurement control apparatus (also referred to as a distribution network PMC) is applied to a distribution network, and includes a measurement class detection module 100, a protection class detection module 200, a switching value acquisition module 300, a processing control module 400 and a data communication module 500.
And the measurement detection module 100 is configured to perform measurement phasor signal detection on a target line in the power distribution network under the time synchronization signal to obtain a measurement signal.
And the protection detection module 200 is configured to perform protection phasor signal detection on the target line in the power distribution network under the time synchronization signal to obtain a protection signal.
And the switching value acquisition module 300 is configured to acquire the switching value under the time synchronization signal to obtain a switching signal.
The processing control module 400 is configured to process the measurement-type signals by using a measurement-type algorithm to obtain measurement-type phasors, process the protection-type signals by using a protection-type algorithm to obtain protection-type phasors, isolate, denoise and prevent jitter on the input signals to obtain input quantities, and drive the output relay 600 in the apparatus according to output data sent by the master station 1 where the power distribution network is located.
A data communication module 500, configured to send the measurement phasor, the protection phasor, and the launch input amount to the master station 1 based on a preset data transmission protocol, and receive the launch data from the master station 1.
In this embodiment, the target line may be one or more lines in the power distribution network, and the position of the target line may be set according to the detection requirement, which is not limited by this disclosure. The data communication module may be connected to the master station through a physical line to perform data transmission communication, and may also perform data transmission communication with the master station through a wireless communication method such as a wireless local area network, which is not limited in this disclosure.
In this embodiment, the measurement type detection module and the protection type detection module may detect signals in different ranges of the same target line in the power distribution network, so as to ensure different detection requirements of the measurement type phasor and the protection type phasor.
In this embodiment, the measurement-like phasor may include phasor, frequency change rate, and according to further calculated analog quantities, such as active power, reactive power, voltage, current, etc., and the protection-like phasor may also include phasor, frequency, and frequency change rate, and according to further calculated analog quantities, such as active power, reactive power, voltage, current, etc. The data communication module may send the received data (including the measurement phasor, the protection phasor, the input volume, the data packet to be sent later, the data to be sent out, and the like) to the master station according to a preset periodic frequency. The data to be transmitted and the cycle frequency of the transmission data may be preset by the apparatus and the master station through negotiation, for example, the apparatus sends a request for determining the data to be transmitted and the cycle frequency to the master station, and then performs data transmission according to the required transmission data and the specified cycle frequency returned by the master station.
The power distribution network synchronous phasor measurement control device and system provided by the embodiment of the disclosure ensure accuracy and reliability of synchronous phasor measurement under the conditions of large-scale distributed power supply, electric automobile access and user and power grid supply and demand interaction, and have high precision and good stability aiming at the characteristics of strong transient, high noise, rich inter-harmonic, weak communication and the like of a power distribution network. The device and the main station where the power distribution network is located can effectively carry out detection and control data transmission, and the supervision level of the power distribution network can be effectively improved. The device has measurement and protection phasor measurement at the same time, the measurement phasor can support the master station to complete regional power grid monitoring, and the protection phasor is uploaded to the master station to realize the regional power grid protection function. Meanwhile, the device finishes the acquisition of the input amount under a time synchronization synchronous clock, and the input amount is sent to the master station on a time scale.
In this embodiment, fig. 2 illustrates a schematic structural diagram of a power distribution network synchronization phasor measurement control apparatus according to an embodiment of the present disclosure. As shown in fig. 2, the synchronization signal may be a synchronization signal determined based on Satellite Navigation systems such as BeiDou Navigation Satellite System (BDS for short), global positioning System (GPS for short) 3, and the like, so as to enable the device to perform clock synchronization and ensure clock requirements during the operation of the device.
In one possible implementation, as shown in fig. 2, the process control module 400 may include a data forwarding sub-module 405. The data forwarding sub-module 405 is connected to the external device 2 through an external interface, and transmits the uplink data packet sent by the external device 2 to the data communication module 500, and/or transmits the received downlink data packet to the external device 2.
The data communication module 500 is configured to send the data to be uploaded to the master station 1 based on the preset data transmission protocol, and/or transmit an issued data packet from the master station 1 to the data forwarding sub-module 405.
In this implementation manner, the data forwarding sub-module may receive an uplink data packet transmitted by the external device through the external interface through the signal conversion circuit 4051 (as shown in fig. 2), and transmit the downlink data packet to the external device through the external interface through the signal conversion circuit 4051. The external device may be any device connected to the apparatus, and a protocol for performing communication between the external device and the apparatus (or a communication protocol supported by the external device) may be the same as or different from a preset data transfer protocol (a protocol between the apparatus and the master station). The external device may be one or more, and the present disclosure is not limited thereto. Therefore, protocol conversion between the master station and the external equipment is realized through the data forwarding sub-module, the signal conversion circuit and the external interface, so that the device can flexibly expand and connect the required external equipment.
In the implementation mode, the device is connected with the external equipment through the external interface, so that the function expansion of the device can be ensured, and the data transmission efficiency of the device and the external equipment is improved. The data forwarding sub-module does not analyze the content of the message when receiving the data message to be sent, the data message to be sent is directly sent to the data communication module as data, the data communication module can send the data message to be sent to the main station as unknown data to be transmitted according to a data transmission protocol preset between the data communication module and the main station, and the device does not unpack and analyze the data message to be sent. When the master station needs to send data to the external equipment, the master station sends an issued data message to the data communication module according to a preset data transmission protocol, the data communication module sends the issued data message to the data forwarding submodule, the data forwarding submodule directly sends the issued data message to the external equipment according to a protocol between the data forwarding submodule and the external equipment, and the device does not unpack and analyze the issued data message. That is, the data forwarding sub-module is used for realizing routing transparent transmission of the message between the external device and the master station, and the message is not unpacked and the internal data is not analyzed in the transmission process.
In one possible implementation, the type of the external interface may include at least one of the following: serial Peripheral interface spi (serial Peripheral interface), Universal Asynchronous Receiver Transmitter (UART) interface integrated with a Universal Asynchronous Receiver Transmitter, and standard 8-bit modular interface RJ45(Registered Jack 45).
In one possible implementation manner, as shown in table 1 below, the fields of the application protocol data frame indicated by the preset data transmission protocol include:
SYNC、FRAMESIZE、IDCODE、NumASDU、ASDU1…ASDUN、CRC，
wherein, the SYNC represents a frame SYNC word, the FRAMESIZE represents a frame byte number, the IDCODE represents an identifier of the device, numsdus represents the number of Application Service Data Units (ASDUs) contained in a current message, ASDU1 … … ASDUN represents a first application service Data Unit … … nth application service Data Unit, and the CRC represents a check byte.
TABLE 1 application protocol data frame
Wherein, the message field indicated by the preset data transmission protocol is set by referring to GB/T26856.2. The CRC16 check code is calculated using a polynomial X15+ X12+ X5+1, with an initial value of 0. The length of the ASDU1 … … ASDUN is determined according to the length of the corresponding application service data unit.
In one possible implementation, the ASDU1 … … ASDUN indicates that the nth application service data unit of the first application service data unit … … may include at least one of: a phasor application service data unit, an open application service data unit, a protocol conversion/encapsulation application service data unit, and an open application service data unit.
In one possible implementation, as shown in table 2, the fields in the phasor application service data unit may include:
ASDU_TAG、ASDUSIZE、SOC、FRACSEC、STAT、PHASORS、FREQ、DRREQ、NALOG，
the ASDU _ TAG represents a label of a corresponding application service data unit, the ASDUSIZE represents an internal byte length of the application service data unit, that is, the number of all bytes after an ASDUSIZE field in the application service data unit is recorded, the SOC is world seconds, the FRACSEC represents the number of seconds and the time quality, and a time scale in phasor data, the STAT represents a status word in a bit correspondence meaning, the phers represents fixed point phasor data of a designated byte, the FREQ represents a frequency offset represented by a fixed point number, the DRREQ represents a frequency change rate represented by a fixed point number, and the NA L represents an analog quantity.
TABLE 2 phasor application service data units
The specific data amount required by phaport and NA L OG can be determined according to the demand or indication between the master stations received by the device, and the length of the field can be determined accordingly.
In one possible implementation manner, as shown in table 3, the fields in the open application service data unit may include:
ASDU_TAG、ASDUSIZE、SOC FRACSEC、STAT、DIGITAL，
wherein DIGITA L represents the input amount.
TABLE 3 open application service data Unit
| Numbering | Field(s) | Length of | Description of the invention |
| 1 | ASDU_TAG | 2 | Tag for opening application service data unit |
| 2 | ASDUSIZE | 2 | Internal byte length |
| 3 | SOC | 4 | Century second |
| 4 | FRACSEC | 4 | Time scale in the data of second even number and time quality and phasor |
| 5 | STAT | 2 | Status word with bit-wise corresponding meaning |
| 6 | DIGITAL | 2*DGNMR | Switching value (DGNMR ═ number of opens +15)/16) |
In one possible implementation, as shown in table 4, the fields in the protocol conversion/encapsulation application service data unit may include:
ASDU_TAG、ASDUSIZE、TRD、MESSAGE，
wherein, the TRD transmission direction includes an uplink transmission or an downlink transmission, the MESSAGE indicates an uplink data MESSAGE or a downlink data MESSAGE to be transmitted,
TABLE 4 protocol conversion/encapsulation application service data unit
| Numbering | Field(s) | Length of | Description of the invention |
| 1 | ASDU_TAG | 2 | Protocol conversion/encapsulation application service data unit label |
| 2 | ASDUSIZE | 2 | Internal byte length |
| 3 | TRD | 2 | The transmission direction is 0xAA55 up-sending and 0xBB44 down-sending |
| 3 | MESSAGE | Lens | Uploading or issuing data messages |
For example, the code for the external device to send data to the master station is set to "0 xAA 55", and the code for the master station to send data to the external device is set to "0 xBB 44", and those skilled in the art can set the code for the transmission direction according to actual needs, which is not limited in this disclosure. The sum of the length of the MESSAGE field is the length of the data MESSAGE to be sent up or the data MESSAGE to be sent down.
In one possible implementation, as shown in table 5, the fields in the open application service data unit may include:
ASDU_TAG、ASDUSIZE、NoDO、DOVal、DOValN
wherein the NoDO represents a turn-out sequence number, the DOVal represents a turn-out value, and the DOValN represents a turn-out value inversion.
Table 5 shows application service data units
| Numbering | Field(s) | Length of | Description of the invention |
| 1 | ASDU_TAG | 2 | Label for opening application service data unit |
| 2 | ASDUSIZE | 2 | Internal byte length |
| 3 | NoDO | 2 | Number of opening |
| 4 | DOVal | 1 | Value of opening |
| 5 | DOValN | 1 | Decoding the decoded value for DOVal check |
In one possible implementation manner, as shown in fig. 2, the measurement class detection module 100 may include: a first current transformer 101 and a first voltage transformer 102. The first current transformer 101 is configured to convert a current in the target line into a measurement-like current. The first voltage transformer 102 is configured to convert a voltage in the target line into a measurement-like voltage.
As shown in fig. 2, the apparatus may further include a low pass filter 700 and an AD acquisition module 800.
The low-pass filter 700 is configured to remove high-frequency portions of the measurement-like current and the measurement-like voltage, respectively, to obtain a filtered measurement-like current and a filtered measurement-like voltage.
The AD collection module 800 performs fixed-frequency sampling on the filtered measurement-like current and the filtered measurement-like voltage respectively under the time synchronization signal (samples analog signals of the filtered measurement-like current and the filtered measurement-like voltage under a specified frequency, converts the analog signals into digital signals), obtains a measurement-like voltage sampling signal and a measurement-like current sampling signal, and sends the measurement-like voltage sampling signal and the measurement-like current sampling signal as the measurement-like signals to the processing control module 400, that is, to the measurement-like processing sub-module 401 in the processing control module 400.
In this implementation, the AD acquisition module may perform fixed-frequency sampling on the small voltages and currents (smaller than the voltages and currents in the power distribution network line) sensed by the first current transformer and the first voltage transformer under the control of the time synchronization signal through the FPGA control, and may set the sampling frequency and times according to the accuracy requirement of the measurement-like phasor, which is not limited by the present disclosure. The number of first current transformers and first voltage transformers, sensing positions in the target line may be set according to phasor measurement needs, which is not limited by the present disclosure.
In one possible implementation, as shown in fig. 2, the process control module 400 may include a measurement class processing sub-module 401.
The measurement processing sub-module 401 is configured to process the measurement signal by using a high-order digital filter, calculate to obtain a measurement phasor, filter the protection phasor by using an anti-aliasing filter, and output the filtered protection phasor to the data communication module 500. In this way, the measurement-type signal is processed by using a high-order digital filter, Discrete Fourier Transform (DFT) is completed, and the measurement-type phasor is obtained by calculation, so that the accuracy of the obtained measurement-type phasor can be ensured, the measurement-type phasor can be ensured to have larger delay, and the measurement requirement can be met.
In one possible implementation, as shown in fig. 2, the protection class detection module 200 may include a second current transformer 201 and a second voltage transformer 202. And the second current transformer 201 is used for converting the current in the target line into a protection current. And a second voltage transformer 202, configured to convert the voltage in the target line into a protection-type voltage.
The low-pass filter 700 is further configured to remove high-frequency portions of the protection current and the protection voltage, respectively, to obtain a post-filtering protection current and a post-filtering protection voltage;
the AD collecting module 800 is further configured to perform fixed-frequency sampling on the filtered protection-type current and the filtered protection-type voltage respectively under the time synchronization signal to obtain a protection-type voltage sampling signal and a protection-type current sampling signal, and send the protection-type voltage sampling signal and the protection-type current sampling signal to the processing control module 400 as the protection-type signal, that is, to the protection-type processing sub-module 402 in the processing control module 400.
In this implementation, the AD acquisition module may perform fixed-frequency sampling on the small voltages and currents (smaller than the voltages and currents in the power distribution network line) sensed by the second current transformer and the second voltage transformer under the control of the time synchronization signal through the FPGA, and may set the sampling frequency and times according to the accuracy requirement of the measurement-like phasor, which is not limited by the present disclosure. The number of the second current transformers and the second voltage transformers, and the sensing position in the target line may be set according to the phasor measurement needs, which is not limited by the present disclosure.
In one possible implementation, as shown in fig. 2, the processing control module 400 may further include a protection class processing sub-module 402. And the protection processing submodule 402 is configured to process the protection signal by using a low-order digital filter to remove a high-frequency component in the protection signal, and further calculate to obtain a protection phasor. Wherein the time delay of the measurement-like phasor is greater than the time delay of the protection-like phasor. Therefore, the low-order digital filter is used for processing the protection signals to remove high-frequency components generated by frequency spectrum leakage of discrete Fourier transform of the protection signals under a dynamic condition, meanwhile, an anti-aliasing filter is not added to the output, the delay of the obtained protection phasor is small, and the requirement of protection speed is met.
In one possible implementation, the process control module 400 may include an open process submodule 403 and an open drive submodule 404.
And an input processing submodule 403, configured to perform isolation, denoising, and anti-shake processing on the input signal to obtain an input amount.
And the opening transmission submodule 404 is used for driving the opening relay 600 in the device according to the opening data sent by the main station 1 where the power distribution network is located.
In a possible implementation manner, the open-end processing sub-module 403 is further configured to identify the open-end amount, obtain a sudden open-end amount of the sudden change when it is determined that the open-end amount has a sudden change, and mark the sudden open-end amount, where the mark may include a timestamp.
The data communication module 500 is further configured to send the marked break-in amount to the primary station 1.
In the implementation mode, after the export amount is obtained by the import processing submodule, the export amount is judged, and if the export amount is normal and has no mutation, the export amount is controlled to be sent to the master station along with the application protocol data frame period. And if the output quantity is suddenly changed, acquiring the sudden change output quantity, carrying out time stamp marking on the sudden change output quantity, and independently uploading to the main station. Therefore, the master station can timely know the output state and respond timely.
In this embodiment, the processing control module may be divided into a measurement processing sub-module, a protection processing sub-module, a data forwarding sub-module, an input processing sub-module, and an output transmission sub-module as described above, and different sub-modules may be implemented by corresponding independent hardware devices, respectively; or the measurement processing submodule, the protection processing submodule, the data forwarding submodule, the input processing submodule and the output transmission submodule can be integrated in a unified hardware device to realize the functions; or one or more of the measurement processing sub-module, the protection processing sub-module, the data forwarding sub-module, the access processing sub-module, and the access transmission sub-module may be integrated in a plurality of hardware devices to implement the functions thereof, for example, the measurement processing sub-module and the protection processing sub-module are integrated in the same hardware device, and the data forwarding sub-module, the access processing sub-module, and the access transmission sub-module are integrated in another hardware device (or the data forwarding sub-module, the access processing sub-module, and the access transmission sub-module are respectively disposed in another hardware device) to implement the functions, which is not limited by the present disclosure.
The utility model also provides a distribution network synchronized phase measurement control system, this system is applied to in the distribution network, and the system includes above-mentioned distribution network synchronized phase measurement control device and the main website that the distribution network is located.
And the master station where the power distribution network is located is used for sending out export data, receiving the measurement phasor, the protection phasor and the import quantity from the device, and analyzing and controlling the power distribution network based on the measurement phasor, the protection phasor and the import quantity. The working process of the primary station is described above, and is not described in detail herein.
In one possible implementation, the system may further include an external device. The functions and working processes of the external device in the system refer to the above description, and are not described herein again.
It should be noted that, although the distribution network synchronous phasor measurement control apparatus and system are described above by taking the above-mentioned embodiments as examples, those skilled in the art can understand that the disclosure should not be limited thereto. In fact, the user can flexibly set each module according to personal preference and/or actual application scene, as long as the technical scheme of the disclosure is met.
Having described embodiments of the present disclosure, the foregoing description is intended to be exemplary, not exhaustive, and not limited to the disclosed embodiments. Many modifications and variations will be apparent to those of ordinary skill in the art without departing from the scope and spirit of the described embodiments. The terms used herein were chosen in order to best explain the principles of the embodiments, the practical application, or technical improvements to the techniques in the marketplace, or to enable others of ordinary skill in the art to understand the embodiments disclosed herein.
Claims (10)
1. A distribution network synchronization phasor measurement control device is applied to a distribution network, and the device comprises:
the measurement detection module is used for detecting a measurement phasor signal of a target line in the power distribution network under the time synchronization synchronous signal to obtain a measurement signal;
the protection detection module is used for carrying out protection phasor signal detection on a target line in the power distribution network under the time synchronization synchronous signal to obtain a protection signal;
the switching value acquisition module is used for carrying out input value acquisition under the time synchronization synchronous signal to obtain an input signal;
the processing control module is used for processing the measurement signals by using a measurement algorithm to obtain measurement phasors, processing the protection signals by using a protection algorithm to obtain protection phasors, isolating, denoising and anti-shaking the input signals to obtain input quantities, and driving an output relay in the device according to output data sent by a master station where the power distribution network is located;
and the data communication module is used for sending the measurement phasor, the protection phasor and the input/output quantity to the master station based on a preset data transmission protocol and receiving the output data from the master station.
2. The apparatus of claim 1,
the measurement type detection module comprises:
the first current transformer is used for converting the current in the target line into a measurement type current;
a first voltage transformer for converting the voltage in the target line to a measurement-like voltage,
wherein the apparatus further comprises:
the low-pass filter is used for respectively removing high-frequency parts in the measurement type current and the measurement type voltage to obtain filtered measurement type current and filtered measurement type voltage;
and the AD acquisition module is used for respectively carrying out fixed-frequency sampling on the filtered measurement class current and the filtered measurement class voltage under the time synchronization synchronous signal to obtain a measurement class voltage sampling signal and a measurement class current sampling signal, and sending the measurement class voltage sampling signal and the measurement class current sampling signal to the processing control module as the measurement class signal.
3. The apparatus of claim 2,
the protection class detection module comprises:
the second current transformer is used for converting the current in the target line into a protection current;
a second voltage transformer for converting the voltage in the target line to a protection-type voltage,
the low-pass filter is further configured to remove high-frequency portions of the protection current and the protection voltage, respectively, to obtain a post-filtering protection current and a post-filtering protection voltage;
the AD acquisition module is further configured to perform fixed-frequency sampling on the filtered protection-type current and the filtered protection-type voltage respectively under the time synchronization signal to obtain a protection-type voltage sampling signal and a protection-type current sampling signal, and send the protection-type voltage sampling signal and the protection-type current sampling signal to the processing control module as the protection-type signal.
4. The apparatus of claim 1, wherein the process control module comprises:
the data forwarding sub-module is connected with external equipment through an external interface, and is used for transmitting the data messages sent by the external equipment to the data communication module and/or transmitting the received data messages sent to the external equipment;
the data communication module is used for sending the data to be uploaded to the master station based on the preset data transmission protocol and/or transmitting the transmitted data message from the master station to the data forwarding submodule,
wherein the type of the external interface comprises at least one of the following types: the system comprises a serial peripheral interface SPI, an interface UART integrated with a universal asynchronous receiving and transmitting transmitter and a standard 8-bit modular interface RJ 45.
5. The apparatus of claim 1, wherein the process control module comprises:
the measurement processing submodule is used for processing the measurement signal by using a high-order digital filter, calculating to obtain measurement phasor, filtering the protection phasor by using an anti-aliasing filter and outputting the filtered protection phasor to the data communication module;
and the protection processing submodule is used for processing the protection signals by using a low-order digital filter so as to remove high-frequency components in the protection signals, and then calculating to obtain protection phasors and outputting the protection phasors to the data communication module.
6. The apparatus of claim 1, wherein the process control module comprises:
the opening processing submodule is used for carrying out isolation, denoising and anti-shake processing on the opening signal to obtain an opening amount;
and the output transmission submodule is used for driving an output relay in the device according to output data sent by a main station where the power distribution network is located.
7. The apparatus of claim 6,
the opening processing submodule is also used for identifying the opening amount, acquiring the sudden change opening amount with sudden change when the opening amount is determined to be suddenly changed, and marking the sudden change opening amount, wherein the mark comprises a timestamp;
the data communication module is further used for sending the marked sudden change opening amount to the master station.
8. The apparatus according to any one of claims 1 to 7, wherein the field of the application protocol data frame indicated by the preset data transmission protocol comprises:
SYNC、FRAMESIZE、IDCODE、NumASDU、ASDU1…ASDUN、CRC，
wherein the SYNC represents a frame SYNC word, the FRAMESIZE represents a number of frame bytes, the IDCODE represents an identification of the apparatus, numsdus represents a number of application service data units contained in a current message, ASDU1 … … ASDUN represents a first application service data unit … … nth application service data unit, and the CRC represents a check byte.
9. The apparatus of claim 1, wherein the application service data unit comprises at least one of: phasor application service data unit, open application service data unit, protocol conversion/encapsulation application service data unit, open application service data unit,
wherein, the fields in the phasor application service data unit include:
ASDU_TAG、ASDUSIZE、SOC、FRACSEC、STAT、PHASORS、FREQ、DRREQ、NALOG，
wherein the ASDU _ TAG represents a label of a corresponding application service data unit, the ASDUSIZE represents an internal byte length of the application service data unit, the SOC is universal seconds, the FRACSEC represents a second division number and a time scale in time quality and phasor data, the STAT represents a status word with a bit corresponding meaning, the PHASORS represents fixed point phasor data of a specified byte, the FREQ represents a frequency offset represented by a fixed point number, the DRREQ represents a frequency change rate represented by the fixed point number, and the NA L OG represents an analog quantity,
the fields opened into the application service data unit include:
ASDU_TAG、ASDUSIZE、SOC FRACSEC、STAT、DIGITAL，
wherein DIGITA L indicates the amount of input,
fields in the protocol conversion/encapsulation application service data unit include:
ASDU_TAG、ASDUSIZE、TRD、MESSAGE，
wherein, the TRD transmission direction includes an uplink transmission or an downlink transmission, the MESSAGE indicates an uplink data MESSAGE or a downlink data MESSAGE to be transmitted,
wherein, the field of the application service data unit comprises:
ASDU_TAG、ASDUSIZE、NoDO、DOVal、DOValN
wherein the NoDO represents a turn-out sequence number, the DOVal represents a turn-out value, and the DOValN represents a turn-out value inversion.
10. The utility model provides a distribution network synchronized phasor measurement control system which characterized in that, is applied to in the distribution network, the system includes: a primary station where the distribution network is located, the distribution network synchronized phasor measurement control apparatus according to any one of claims 1 to 9,
and the master station where the power distribution network is located is used for sending out export data, receiving the measurement phasor, the protection phasor and the import quantity from the device, and analyzing and controlling the power distribution network based on the measurement phasor, the protection phasor and the import quantity.
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