CN111736903B - Synchronous acquisition and processing method for low-voltage power grid state information - Google Patents
Synchronous acquisition and processing method for low-voltage power grid state information Download PDFInfo
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- CN111736903B CN111736903B CN202010764721.5A CN202010764721A CN111736903B CN 111736903 B CN111736903 B CN 111736903B CN 202010764721 A CN202010764721 A CN 202010764721A CN 111736903 B CN111736903 B CN 111736903B
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F9/00—Arrangements for program control, e.g. control units
- G06F9/06—Arrangements for program control, e.g. control units using stored programs, i.e. using an internal store of processing equipment to receive or retain programs
- G06F9/30—Arrangements for executing machine instructions, e.g. instruction decode
- G06F9/38—Concurrent instruction execution, e.g. pipeline, look ahead
- G06F9/3885—Concurrent instruction execution, e.g. pipeline, look ahead using a plurality of independent parallel functional units
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01D—MEASURING NOT SPECIALLY ADAPTED FOR A SPECIFIC VARIABLE; ARRANGEMENTS FOR MEASURING TWO OR MORE VARIABLES NOT COVERED IN A SINGLE OTHER SUBCLASS; TARIFF METERING APPARATUS; MEASURING OR TESTING NOT OTHERWISE PROVIDED FOR
- G01D21/00—Measuring or testing not otherwise provided for
- G01D21/02—Measuring two or more variables by means not covered by a single other subclass
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F15/00—Digital computers in general; Data processing equipment in general
- G06F15/76—Architectures of general purpose stored program computers
- G06F15/78—Architectures of general purpose stored program computers comprising a single central processing unit
- G06F15/7807—System on chip, i.e. computer system on a single chip; System in package, i.e. computer system on one or more chips in a single package
- G06F15/7825—Globally asynchronous, locally synchronous, e.g. network on chip
Abstract
A synchronous acquisition and processing method for low-voltage power grid state information comprises a method of uploading the monitoring result to a power supply monitoring system by means of existing standard distribution transformer monitoring and metering terminal modules of each distribution area, and the method can be achieved by an intelligent monitoring terminal and the distribution transformer monitoring and metering terminal modules together, and comprises the following processes: s1: the distribution transformer monitoring and metering terminal module transmits the encrypted request instruction to the intelligent monitoring terminal; s2: and the intelligent monitoring terminal receives the encrypted request instruction transmitted by the distribution transformer monitoring and metering terminal module. By combining other combinations and methods, the defects that the request instruction is always transmitted every time, unreceived conditions can be caused, and the stability of the request instruction transmission in the distribution transformer monitoring and metering terminal module is poor when the distribution transformer monitoring and metering terminal module of the intelligent monitoring terminal of the low-voltage power grid transmits the request instruction again in the prior art are effectively avoided.
Description
Technical Field
The embodiment of the invention relates to the technical field of low-voltage power grids, belongs to the technical field of acquisition and processing, and particularly relates to a synchronous acquisition and processing method for state information of a low-voltage power grid.
Background
The power line with rated voltage of 1kV or below is a low-voltage power grid. The low-voltage power grid comprises a low-voltage overhead line, a low-voltage overhead insulated line, a low-voltage cable line and an indoor distribution line, is used for directly transmitting electric energy to low-voltage electric equipment, and is an important component of a low-voltage power distribution system (see low-voltage power distribution). The low-voltage power grid can be accessed from a public low-voltage distribution network and is led out through a low-voltage distribution room; can also be led out from the low-voltage distribution device of the user-owned substation distribution room. The application popularization rate of the low-voltage power grid is extremely wide, so that the monitoring of the low-voltage power grid is more and more necessary, an intelligent monitoring terminal of the low-voltage power grid is provided at present, the intelligent monitoring terminal can upload monitoring results of three electrical parameters of field leakage, neutral current and transformer temperature of transformers in each transformer area to a power supply monitoring system by means of existing standard distribution transformer monitoring and metering terminal modules in each transformer area, the real-time monitoring of the power consumption state of each transformer area is realized, and a reliable basis can be provided for solving the problem of low-voltage line leakage current.
In the specific application, the intelligent monitoring terminal can upload the monitoring results of three electrical parameters of field leakage, neutral current and transformer temperature of each transformer area to the power supply monitoring system by means of the existing standard distribution transformer monitoring and metering terminal module of each transformer area, the intelligent monitoring terminal comprises a 16-bit singlechip connected with a GPRS module I, the distribution transformer monitoring and metering terminal module comprises an encrypted monitoring result value processor connected with a GPRS module II serving as an encrypted monitoring result value remote transmission module, the power supply monitoring system is a computer in a GPRS network, and the process of uploading such monitoring results to the power supply monitoring system comprises the following steps: the distribution transformer monitoring and metering terminal module transmits a request instruction, the intelligent monitoring terminal receives the request instruction, and transmits an encrypted monitoring result value on a subcarrier set on the request instruction and a modulation symbol on the subcarrier; the distribution transformer monitoring and metering terminal module forwards the received encrypted monitoring result value to the power supply monitoring system, the power supply monitoring system receives the encrypted monitoring result value and decrypts the received encrypted monitoring result value, and the decrypted state is transmitted back to the distribution transformer monitoring and metering terminal module to execute feedback; if the intelligent monitoring terminal does not receive the request instruction, the distribution transformer monitoring and metering terminal module repeatedly transmits a plurality of request instructions which are the same as the set value to the intelligent monitoring terminal again according to the set value which is set in advance.
However, when the intelligent monitoring terminal does not receive the request instruction, the distribution transformer monitoring and metering terminal module transmits the request instruction again according to the preset set value, but does not change the transmission mode of the request instruction, if the transmission effect of the subcarrier used for transmitting the request instruction and the modulation symbol on the subcarrier is not good, the request instruction is transmitted on the subcarrier and the modulation symbol on the subcarrier every time, the request instruction is always transmitted every time, and the situation that the request instruction is not received also occurs, so that the stability of the request instruction transmission in the current distribution transformer monitoring and metering terminal module is not good.
Disclosure of Invention
In order to solve the above problems, embodiments of the present invention provide a synchronous acquisition and processing method for low-voltage power grid status information, which effectively avoids the defects that the request instruction transmission is not successful every time, the unreceived status is caused, and the stability of the request instruction transmission in the distribution monitoring and metering terminal module is poor when the distribution monitoring and metering terminal module of the intelligent monitoring terminal of the low-voltage power grid transmits the request instruction again in the prior art.
In order to overcome the defects in the prior art, the embodiment of the invention provides a solution for a method for synchronously acquiring and processing state information of a low-voltage power grid, which comprises the following steps:
a synchronous acquisition and processing method for low-voltage power grid state information comprises the following steps:
the intelligent monitoring terminal of the low-voltage power grid uploads the monitoring results of three electrical parameters of field leakage, neutral current and transformer temperature of the transformer of each transformer area to a power supply monitoring system by means of the existing standard distribution transformer monitoring and metering terminal module of each transformer area;
the method for uploading the monitoring result to the power supply monitoring system by means of the existing standard distribution transformer monitoring and metering terminal module of each distribution area can be achieved by the intelligent monitoring terminal and the distribution transformer monitoring and metering terminal module together, and comprises the following procedures:
s1: the distribution transformer monitoring and metering terminal module transmits the encrypted request instruction to the intelligent monitoring terminal;
s2: the intelligent monitoring terminal receives an encrypted request instruction transmitted by the distribution transformer monitoring and metering terminal module;
s3: the intelligent monitoring terminal decrypts the encrypted request instruction and responds the decryption condition of the request instruction to the distribution transformer monitoring and metering terminal module;
s4: if the distribution transformer monitoring and metering terminal module receives a decryption condition which indicates that the request instruction is decrypted without errors and is transmitted by the intelligent monitoring terminal, the request instruction is determined to be transmitted; otherwise, according to a preset mode of retransmitting the request command, retransmitting the request command to the intelligent monitoring terminal;
here, the retransmitting of the request command to the smart monitoring terminal according to a preset request command retransmission mode includes:
the distribution transformer monitoring and metering terminal module starts a timing unit for timing after transmitting the request instruction, if the distribution transformer monitoring and metering terminal module does not receive the decryption condition of the request instruction within a preset timing time interval after the distribution transformer monitoring and metering terminal module transmits the request instruction, the distribution transformer monitoring and metering terminal module indicates that the request instruction cannot be transmitted, and the distribution transformer monitoring and metering terminal module transmits the request instruction to the intelligent monitoring terminal again according to a preset mode of retransmitting the request instruction; if the distribution transformer monitoring and metering terminal module receives a request instruction decryption condition in a preset time interval after the distribution transformer monitoring and metering terminal module transmits the request instruction, and the decryption condition indicates that the request instruction decryption is wrong, the request instruction cannot be transmitted, and the distribution transformer monitoring and metering terminal module transmits the request instruction to the intelligent monitoring terminal again according to a mode of transmitting the request instruction again in advance;
if the distribution transformer monitoring and metering terminal module receives the request instruction decryption condition in a preset timing time interval after the distribution transformer monitoring and metering terminal module transmits the request instruction, and the decryption condition indicates that the request instruction decryption is correct, the distribution transformer monitoring and metering terminal module determines that the request instruction transmission is achieved.
Further, after the intelligent monitoring terminal responds the decryption status of the request instruction to the distribution transformer monitoring and metering terminal module, if the request instruction is decrypted without errors, the intelligent monitoring terminal transmits an encrypted monitoring result value to the distribution transformer monitoring and metering terminal module under the condition of the subcarrier set by the request instruction and the modulation symbol on the subcarrier.
Further, according to a preset mode of retransmitting the request command, a specific manner of retransmitting the request command to the smart monitoring terminal may be: the distribution transformer monitoring and metering terminal module respectively transmits request instructions under the transmission conditions of a preset number of subcarriers selected from an available subcarrier range and modulation symbols on the subcarriers.
Further, after the request instruction is transmitted to the intelligent monitoring terminal again according to a mode of re-transmitting the preset request instruction, if the request instruction is transmitted to the intelligent monitoring terminal, the distribution transformer monitoring and metering terminal module receives the encrypted monitoring result value transmitted by the intelligent monitoring terminal under the transmission condition of the subcarrier set by the request instruction and the modulation symbol on the subcarrier, and then the distribution transformer monitoring and metering terminal module forwards the encrypted monitoring result value to the power supply monitoring system for decryption.
The unit of the intelligent monitoring terminal who operates in low voltage electric wire netting includes:
the first transceiving unit is used for receiving the encrypted request instruction transmitted by the distribution transformer monitoring and metering terminal unit;
a first processing unit, configured to decrypt the encrypted request instruction;
the first transceiver unit is further used for responding the decryption condition of the encrypted request command to the distribution transformer monitoring and metering terminal unit.
Further, the first transceiver unit is further configured to:
and if the request instruction is decrypted without errors, transmitting the encrypted monitoring result value to the distribution transformer monitoring and metering terminal module under the condition of the subcarrier set by the request instruction and the modulation symbol on the subcarrier.
The unit running in the distribution transformer monitoring and metering terminal module comprises:
the timing unit is used for timing to a set time interval;
the second transceiving unit is used for transmitting a request instruction to the intelligent monitoring terminal;
the second processing unit is used for confirming that the request instruction is transmitted if a decryption condition which indicates that the request instruction is decrypted without errors and is transmitted by the intelligent monitoring terminal is received; otherwise, activating the second handling unit to transmit the request command to the intelligent monitoring terminal again according to the mode of transmitting the request command again set in advance.
Further, the second treatment unit is specifically configured to:
and activating the second transceiver unit to select a set number of subcarriers and modulation symbols on the subcarriers in a subcarrier range, and respectively transmitting the request command according to the transmission conditions.
Therefore, the request instructions can be transmitted again and respectively in a better combination mode on a plurality of subcarriers selected in the subcarrier range and the modulation symbols on the subcarriers, the number of bits transmitted in unit time for transmitting the request instructions is reduced, the intelligent monitoring terminal is enabled to receive the request instructions more conveniently, and the stability of request instruction transmission can be improved efficiently.
Furthermore, the intelligent monitoring terminal comprises a 16-bit single chip microcomputer connected with a GPRS module I, the distribution transformer monitoring and metering terminal module comprises an encrypted monitoring result value processor connected with a GPRS module II serving as an encrypted monitoring result value remote transmission module, and the power supply monitoring system is a computer in a GPRS network.
The embodiment of the invention has the beneficial effects that:
the invention can decrypt the request instruction in real time after the intelligent monitoring terminal receives the request instruction, and returns the decryption status to the distribution transformer monitoring and metering terminal module, if the distribution transformer monitoring and metering terminal module does not receive the response that the request instruction is decrypted without errors, a plurality of subcarriers and modulation symbols on the subcarriers are selected in the subcarrier range, and the request instruction is transmitted again in a better combination mode, so that the number of bits transmitted in unit time for transmitting the request instruction is not reduced, the combination of the request instruction on the subcarriers and modulation symbols on the subcarriers is also well realized, the intelligent monitoring terminal can receive the request instruction more conveniently, and the stability of transmitting the request instruction is improved efficiently.
Drawings
Fig. 1 is a flowchart of a method for synchronously acquiring and processing status information of a low-voltage power grid according to an embodiment of the present invention.
Fig. 2 is a unit structure diagram in the method for synchronously acquiring and processing the state information of the low-voltage power grid according to the embodiment of the present invention.
Detailed Description
The embodiments of the present invention will be further described with reference to the drawings and the embodiments.
As shown in fig. 1-2, the method for synchronously acquiring and processing the state information of the low-voltage power grid includes:
the intelligent monitoring terminal of the low-voltage power grid uploads the monitoring results of three electrical parameters of field leakage, neutral current and transformer temperature of the transformer of each transformer area to a power supply monitoring system by means of the existing standard distribution transformer monitoring and metering terminal module of each transformer area;
the method for uploading the monitoring result to the power supply monitoring system by means of the existing standard distribution transformer monitoring and metering terminal module of each distribution area can be achieved by the intelligent monitoring terminal and the distribution transformer monitoring and metering terminal module together, and comprises the following procedures:
s1: the distribution transformer monitoring and metering terminal module transmits the encrypted request instruction to the intelligent monitoring terminal; the request instruction is used for requesting the intelligent monitoring terminal to transmit the monitoring result value.
Here, when the distribution transformer monitoring and metering terminal module requires the intelligent monitoring terminal to transmit the encrypted monitoring result value to the distribution transformer monitoring and metering terminal module, the distribution transformer monitoring and metering terminal module sets a subcarrier used for transmitting the encrypted monitoring result value and a modulation symbol on the subcarrier for the intelligent monitoring terminal, and then constructs a request instruction by means of the subcarrier set for the intelligent monitoring terminal and the modulation symbol on the subcarrier, namely the request instruction comprises the subcarrier set for the intelligent monitoring terminal and the modulation symbol on the subcarrier, so as to transmit the encrypted request instruction to the intelligent monitoring terminal; the modulation symbols can be 16QAM symbols. The encryption mode is DES encryption.
S2: the intelligent monitoring terminal receives an encrypted request instruction transmitted by the distribution transformer monitoring and metering terminal module;
s3: the intelligent monitoring terminal decrypts the encrypted request instruction and responds the decryption condition of the request instruction to the distribution transformer monitoring and metering terminal module; the decryption mode is EDS decryption.
The intelligent monitoring terminal decrypts the received encrypted request command, determines whether the encrypted request command is decrypted correctly, obtains the decryption condition of the request command, and responds the decryption condition to the distribution transformer monitoring and metering terminal module. Just like, the intelligent monitoring terminal can decrypt the received encrypted request instruction and then execute parity check to obtain the decryption condition of the request instruction; if the decryption is correct, responding to the distribution transformer monitoring and metering terminal module without error information; if the decryption is wrong, responding to a wrong message to the distribution transformer monitoring and metering terminal module. An error-free message can be a "you wu" string and an error-free message can be a "wuwuwu" string.
Therefore, the distribution transformer monitoring and metering terminal module can determine whether the request command is transmitted or not, so as to perform corresponding treatment.
And after the intelligent monitoring terminal responds the decryption state of the request instruction to the distribution transformer monitoring and metering terminal module, if the request instruction is decrypted without errors, the intelligent monitoring terminal transmits an encrypted monitoring result value to the distribution transformer monitoring and metering terminal module under the condition of the subcarrier set by the request instruction and the modulation symbol on the subcarrier. The encryption mode is DES encryption.
Here, if the request command is decrypted without errors, the intelligent monitoring terminal recognizes the subcarrier and the modulation symbol on the subcarrier when the encrypted monitoring result value is transmitted by the request command, and transmits the encrypted monitoring result value to the distribution transformer monitoring and metering terminal module under the transmission condition of the subcarrier and the modulation symbol on the subcarrier.
S4: if the distribution transformer monitoring and metering terminal module receives a decryption condition which indicates that the request instruction is decrypted without errors and is transmitted by the intelligent monitoring terminal, the request instruction is determined to be transmitted; otherwise, according to a preset mode of retransmitting the request command, retransmitting the request command to the intelligent monitoring terminal;
here, the retransmitting of the request command to the smart monitoring terminal according to a preset request command retransmission mode includes:
the distribution transformer monitoring and metering terminal module starts a timing unit for timing after transmitting the request instruction, if the distribution transformer monitoring and metering terminal module does not receive the decryption condition of the request instruction within a preset timing time interval after the distribution transformer monitoring and metering terminal module transmits the request instruction, the distribution transformer monitoring and metering terminal module indicates that the request instruction cannot be transmitted, and the distribution transformer monitoring and metering terminal module transmits the request instruction to the intelligent monitoring terminal again according to a preset mode of retransmitting the request instruction; if the distribution transformer monitoring and metering terminal module receives a request instruction decryption condition in a preset time interval after the distribution transformer monitoring and metering terminal module transmits the request instruction, and the decryption condition indicates that the request instruction decryption is wrong, the request instruction cannot be transmitted, and the distribution transformer monitoring and metering terminal module transmits the request instruction to the intelligent monitoring terminal again according to a mode of transmitting the request instruction again in advance;
if the distribution transformer monitoring and metering terminal module receives the request instruction decryption condition in a preset timing time interval after the distribution transformer monitoring and metering terminal module transmits the request instruction, and the decryption condition indicates that the request instruction decryption is correct, the distribution transformer monitoring and metering terminal module determines that the request instruction transmission is achieved.
Therefore, the distribution transformer monitoring and metering terminal module can determine whether the request command is transmitted or not in real time according to the decryption condition of the request command; if the request instruction cannot be transmitted, the current request instruction transmission mode can be changed, the achievement probability of the request instruction transmission is increased, and the stability of the request instruction transmission can be effectively improved.
According to a preset mode of retransmitting the request command, a specific mode of retransmitting the request command to the intelligent monitoring terminal can be as follows: the distribution transformer monitoring and metering terminal module respectively transmits request instructions under the transmission conditions of a preset number of subcarriers selected from an available subcarrier range and modulation symbols on the subcarriers.
Here, the distribution monitoring and metering terminal module executes a change to the request instruction transmission mode by means of the current request instruction transmission mode, and selects a plurality of subcarriers and modulation symbols on the subcarriers within the subcarrier range, as if the modulation symbols on the subcarriers are selected within the subcarrier range, or selects a plurality of subcarriers within the subcarrier range, or selects the modulation symbols on the subcarriers and a plurality of subcarriers within the subcarrier range, and respectively transmits the request instructions on the modulation symbols on a greater number of subcarriers and a lower number of subcarriers within the subcarrier range. The subcarrier range is the modulation symbols on all available subcarriers and subcarriers of the distribution transformer monitoring and metering terminal module.
Therefore, the request instructions can be transmitted again and respectively in a better combination mode on a plurality of subcarriers selected in the subcarrier range and the modulation symbols on the subcarriers, the number of bits transmitted in unit time for transmitting the request instructions is reduced, the intelligent monitoring terminal is enabled to receive the request instructions more conveniently, and the stability of request instruction transmission can be improved efficiently.
According to a mode of re-transmitting a preset request instruction, after the request instruction is transmitted to the intelligent monitoring terminal again, if the request instruction is transmitted, the distribution transformer monitoring and metering terminal module receives an encrypted monitoring result value transmitted by the intelligent monitoring terminal under the transmission condition of the subcarrier set by the request instruction and the modulation symbol on the subcarrier, and then the distribution transformer monitoring and metering terminal module forwards the encrypted monitoring result value to the power supply monitoring system for decryption.
Here, if the request instruction is transmitted, the distribution transformer monitoring and metering terminal module recognizes the subcarrier receiving the encrypted monitoring result value or transmitting the encrypted monitoring result value and the modulation symbol on the subcarrier by virtue of the request instruction, and transmits the encrypted monitoring result value to the distribution transformer monitoring and metering terminal module under the transmission condition of the subcarrier and the modulation symbol on the subcarrier, so that the distribution transformer monitoring and metering terminal module transmits the encrypted monitoring result value to the power supply monitoring system for decryption.
Under different conditions, the following example was used:
example one: under the condition of transmitting the encrypted monitoring result value of the low modulation symbol, the transmission flow of the encrypted monitoring result value comprises the following steps:
here, the number of modulation symbols per subcarrier that the low modulation symbol is set to the encrypted monitor result value for the request command is not higher than 400.
The distribution transformer monitoring and metering terminal module transmits the encrypted request instruction to the intelligent monitoring terminal; the intelligent monitoring terminal receives the encrypted request instruction and executes decryption on the encrypted request instruction, and if the decryption of the request instruction is achieved, an error-free message is responded to the distribution transformer monitoring and metering terminal module; if the request instruction cannot be decrypted, responding to the distribution transformer monitoring and metering terminal module to obtain an error message; if the distribution transformer monitoring and metering terminal module receives the error-free message, the intelligent monitoring terminal is considered to decrypt the encrypted request instruction, the request instruction and the encrypted monitoring result value are transmitted according to the previous selection, if the distribution transformer monitoring and metering terminal module does not receive the error-free message/the error message or receives the error message, the intelligent monitoring terminal is considered not to receive the request instruction, and then a plurality of modulation symbols on a plurality of subcarriers with higher numbers and a plurality of subcarriers with lower numbers are selected in the subcarrier range to transmit the request instruction again.
Example two: under the condition of transmitting the encrypted monitoring result value of the high modulation symbol, the transmission flow of the encrypted monitoring result value comprises the following steps:
here, the number of modulation symbols per subcarrier that the low modulation symbol is set to the encrypted monitor result value for the request command is higher than 400.
The distribution transformer monitoring and metering terminal module transmits a request instruction to the intelligent monitoring terminal; the intelligent monitoring terminal receives the request instruction and decrypts the request instruction; if the request command decryption is achieved, responding to the distribution transformer monitoring and metering terminal module without error information; if the request instruction cannot be decrypted, responding to the distribution transformer monitoring and metering terminal module to obtain an error message; if the distribution transformer monitoring and metering terminal module receives the error-free message for the first time, the intelligent monitoring terminal is considered to achieve the decryption of the request instruction, and the request instruction and the encrypted monitoring result value are transmitted according to the selection in the prior art; the intelligent monitoring terminal receives the encrypted monitoring result value transmitted by the distribution transformer monitoring and metering terminal module and decrypts the received encrypted monitoring result value, and if the encrypted monitoring result value is decrypted, an error-free message is responded to the distribution transformer monitoring and metering terminal module; if the encrypted monitoring result value cannot be decrypted, responding to a fault message to the distribution transformer monitoring and metering terminal module; if the distribution transformer monitoring and metering terminal module receives the error-free message again, the intelligent monitoring terminal is considered to achieve the decryption of the encrypted monitoring result value, and the encrypted monitoring result value is informed to be transmitted. If the distribution transformer monitoring and metering terminal module does not receive the error-free message or receives the error message, the intelligent monitoring terminal module is considered not to receive the request instruction, and the distribution transformer monitoring and metering terminal module selects a plurality of subcarriers with higher numbers and modulation symbols on the subcarriers with lower numbers in the subcarrier range to transmit the request instruction again.
Example three: under the condition of high-hysteresis encrypted monitoring result value transmission, the transmission flow of the encrypted monitoring result value comprises the following steps:
here, the high hysteresis is that the time interval when the request command is transmitted to the intelligent monitoring terminal through the distribution transformer monitoring and metering terminal module and the corresponding encrypted monitoring result value is transmitted is over 600 modulation symbols.
The distribution transformer monitoring and metering terminal module transmits the encrypted request instruction to the intelligent monitoring terminal; the intelligent monitoring terminal receives the encrypted request command and decrypts the encrypted request command; if the encrypted request command is decrypted, responding to the distribution transformer monitoring and metering terminal module without error information; if the request instruction cannot be decrypted, responding to the distribution transformer monitoring and metering terminal module to obtain an error message; if the distribution transformer monitoring and metering terminal module receives the error-free message, the intelligent monitoring terminal is considered to achieve the decryption of the request instruction, and the distribution transformer monitoring and metering terminal module does not transmit the request instruction; if the distribution transformer monitoring and metering terminal module does not receive the error-free message or receives the error message, the intelligent monitoring terminal is considered to not receive the request instruction, the distribution transformer monitoring and metering terminal module can transmit the request instruction again, the time interval from the time when the distribution transformer monitoring and metering terminal module transmits the request instruction to the time when the intelligent monitoring terminal transmits the corresponding encrypted monitoring result value is 800 modulation symbols, the intelligent monitoring terminal cannot decrypt the first request instruction, and the intelligent monitoring terminal responds to the distribution transformer monitoring and metering terminal module in real time with the error message; the distribution transformer monitoring and metering terminal module receives the error message, starts on the next modulation symbol when receiving the error message, and selects a plurality of modulation symbols on a subcarrier with higher number and a subcarrier with lower number in the subcarrier range control resource set to transmit the request instruction again; the intelligent monitoring terminal receives the encrypted request instruction transmitted by the distribution transformer monitoring and metering terminal module again and decrypts the request instruction; the secondary intelligent monitoring terminal decrypts the request command and responds to the distribution transformer monitoring and metering terminal module without error information; the distribution transformer monitoring and metering terminal module receives the error-free message number and stops retransmitting the request instruction; and then, the intelligent monitoring terminal transmits the encrypted monitoring result value to the distribution transformer monitoring metering terminal module under the transmission condition of the subcarrier set by the request instruction and the modulation symbol on the subcarrier.
The unit of the intelligent monitoring terminal who operates in low voltage electric wire netting includes:
the first transceiving unit is used for receiving the encrypted request instruction transmitted by the distribution transformer monitoring and metering terminal unit;
a first processing unit, configured to decrypt the encrypted request instruction;
the first transceiver unit is further used for responding the decryption condition of the encrypted request command to the distribution transformer monitoring and metering terminal unit.
The first transceiver unit is further configured to:
and if the request instruction is decrypted without errors, transmitting the encrypted monitoring result value to the distribution transformer monitoring and metering terminal module under the condition of the subcarrier set by the request instruction and the modulation symbol on the subcarrier.
The unit running in the distribution transformer monitoring and metering terminal module comprises:
the timing unit is used for timing to a set time interval;
the second transceiving unit is used for transmitting a request instruction to the intelligent monitoring terminal;
the second processing unit is used for confirming that the request instruction is transmitted if a decryption condition which indicates that the request instruction is decrypted without errors and is transmitted by the intelligent monitoring terminal is received; otherwise, activating the second handling unit to transmit the request command to the intelligent monitoring terminal again according to the mode of transmitting the request command again set in advance.
The second treatment unit is specifically used for:
and activating the second transceiver unit to select a set number of subcarriers and modulation symbols on the subcarriers in a subcarrier range, and respectively transmitting the request command according to the transmission conditions.
Therefore, the request instructions can be transmitted again and respectively in a better combination mode on a plurality of subcarriers selected in the subcarrier range and the modulation symbols on the subcarriers, the number of bits transmitted in unit time for transmitting the request instructions is reduced, the intelligent monitoring terminal is enabled to receive the request instructions more conveniently, and the stability of request instruction transmission can be improved efficiently.
The intelligent monitoring terminal comprises a 16-bit single-chip microcomputer connected with a GPRS module I, the distribution transformer monitoring and metering terminal module comprises an encrypted monitoring result value processor connected with a GPRS module II serving as an encrypted monitoring result value remote transmission module, and the power supply monitoring system is a computer in a GPRS network.
In addition, specifically, the intelligent monitoring terminal of the low-voltage power grid is composed of a residual current signal acquisition module, a neutral current signal acquisition module, a temperature signal acquisition circuit module, a 1 st positive half-wave signal conditioning circuit module, a 1 st negative half-wave signal conditioning circuit module, a 2 nd positive half-wave signal conditioning circuit module, a 2 nd negative half-wave signal conditioning circuit module, an analog signal conditioning circuit module, a 1 st self-checking reference module, a 2 nd self-checking reference module, a 3 rd self-checking reference module, a 16 th singlechip, an analog leakage signal generator, a liquid crystal module, a 4-way relay control circuit module, a 4-way 220V input signal sampling circuit module and a key module, wherein a residual current I delta port of the transformer is connected with an input end of the residual current signal acquisition module, and an output end of the residual current signal acquisition module is connected with an input end of the 16 th singlechip through the 1 st positive half-wave signal conditioning circuit module and the 1 st negative half- The output end of the neutral current signal acquisition module of the transformer is connected with the input end of the neutral current signal acquisition module through a 2 nd positive half-wave signal conditioning circuit module and a 2 nd negative half-wave signal conditioning circuit module respectively, the output end of the neutral current signal acquisition module is connected with the input end of the 16-bit single chip microcomputer through a 2 nd positive half-wave signal conditioning circuit module and a 2 nd negative half-wave signal conditioning circuit module, the temperature T port of the transformer is connected with the input end of the temperature signal acquisition circuit module, the output end of the temperature signal acquisition circuit module is connected with the 12 input end of the 16-bit single chip microcomputer through an analog signal conditioning circuit module, analog leakage signals generated by the analog leakage signal generator are processed by the 16-bit single chip microcomputer and then are respectively output to the input end of the residual current signal acquisition module through a 1 st self-checking reference module, to the input, the output end of the 16-bit single chip microcomputer is connected with the input end of the 4-path relay control circuit module, the four output ends of the 4-path relay control circuit module are correspondingly connected with the four input ends of a distribution transformer monitoring and metering terminal module of an external transformer area respectively, the four input ends of the 4-path 220V input signal sampling circuit module are correspondingly connected with a master switch, a 1 st branch switch, a 2 nd branch switch and a 3 rd branch switch of an external transformer 18 respectively, the output end of the 4-path 220V input signal sampling circuit module is connected with the input end of the 16-bit single chip microcomputer, the output end of the key module is connected with the input end of the 16-bit single chip microcomputer, and the output end of the 16-bit single chip microcomputer is.
Signals acquired by a sensor through residual current I delta of the transformer are subjected to change amplification of positive and negative half-wave signals through the 1 st positive half-wave signal conditioning circuit module and the 1 st negative half-wave signal conditioning circuit module and then input to a 16-bit single chip microcomputer to execute operation processing.
Signals acquired by a neutral line current Io of the transformer through a sensor are subjected to change amplification of positive and negative half-wave signals through the 2 nd positive half-wave signal conditioning circuit module and the 2 nd negative half-wave signal conditioning circuit module and then input to a 16-bit single chip microcomputer to perform operation processing.
Signals acquired by the temperature T of the transformer through the sensor are subjected to change amplification of analog signals through the analog signal conditioning circuit module and then input to the 16-bit single chip microcomputer to be operated.
In order to ensure the monitoring stability of three sensing signals of residual current I delta, neutral current Io and transformer temperature T of the transformer, the device is provided with a self-checking reference module, and the device can monitor whether the three signal acquisition modules are in normal operation or not in real time during operation. The specific working process is as follows: the sine signal generated by the analog leakage signal generator is periodically converted into three paths of self-checking reference signals by a 16-bit single chip microcomputer, and then is respectively transmitted to a residual current signal acquisition module, a neutral current signal acquisition module and a temperature signal acquisition circuit module by 1 st, 2 nd and 3 rd self-checking reference modules 1, 3 and 10, and if the 16-bit single chip microcomputer can respectively receive the three paths of self-checking reference signals, the three paths of signal acquisition modules are in a normal operation process. And if the 16-bit single chip microcomputer emits an audible and visual alarm signal, the user is reminded to process in time.
While the embodiments of the present invention have been described above in terms of procedures illustrated by the embodiments, it will be understood by those skilled in the art that the present disclosure is not limited to the embodiments described above, and that various changes, modifications, and substitutions can be made without departing from the scope of the embodiments of the present invention.
Claims (8)
1. A synchronous acquisition and processing method for low-voltage power grid state information is characterized by comprising the following steps:
the intelligent monitoring terminal of the low-voltage power grid uploads the monitoring results of three electrical parameters of field leakage, neutral current and transformer temperature of the transformer of each transformer area to a power supply monitoring system by means of the existing standard distribution transformer monitoring and metering terminal module of each transformer area;
the method for uploading the monitoring result to the power supply monitoring system by means of the existing standard distribution transformer monitoring and metering terminal module of each distribution area can be achieved by the intelligent monitoring terminal and the distribution transformer monitoring and metering terminal module together, and comprises the following procedures:
s1: the distribution transformer monitoring and metering terminal module transmits the encrypted request instruction to the intelligent monitoring terminal;
s2: the intelligent monitoring terminal receives an encrypted request instruction transmitted by the distribution transformer monitoring and metering terminal module;
s3: the intelligent monitoring terminal decrypts the encrypted request instruction and responds the decryption condition of the request instruction to the distribution transformer monitoring and metering terminal module;
s4: if the distribution transformer monitoring and metering terminal module receives a decryption condition which indicates that the request instruction is decrypted without errors and is transmitted by the intelligent monitoring terminal, the request instruction is determined to be transmitted; otherwise, according to a preset mode of retransmitting the request command, retransmitting the request command to the intelligent monitoring terminal;
here, the retransmitting of the request command to the smart monitoring terminal according to a preset request command retransmission mode includes:
the distribution transformer monitoring and metering terminal module starts a timing unit for timing after transmitting the request instruction, if the distribution transformer monitoring and metering terminal module does not receive the decryption condition of the request instruction within a preset timing time interval after the distribution transformer monitoring and metering terminal module transmits the request instruction, the distribution transformer monitoring and metering terminal module indicates that the request instruction cannot be transmitted, and the distribution transformer monitoring and metering terminal module transmits the request instruction to the intelligent monitoring terminal again according to a preset mode of retransmitting the request instruction; if the distribution transformer monitoring and metering terminal module receives a request instruction decryption condition in a preset time interval after the distribution transformer monitoring and metering terminal module transmits the request instruction, and the decryption condition indicates that the request instruction decryption is wrong, the request instruction cannot be transmitted, and the distribution transformer monitoring and metering terminal module transmits the request instruction to the intelligent monitoring terminal again according to a mode of transmitting the request instruction again in advance;
if the distribution transformer monitoring and metering terminal module receives the request instruction decryption condition and the decryption condition indicates that the request instruction decryption is correct in a preset timing time interval after the distribution transformer monitoring and metering terminal module transmits the request instruction, the distribution transformer monitoring and metering terminal module determines that the request instruction transmission is achieved;
according to a preset mode of retransmitting the request command, a specific mode of retransmitting the request command to the intelligent monitoring terminal can be as follows: the distribution transformer monitoring and metering terminal module respectively transmits request instructions under the transmission conditions of a preset number of subcarriers selected from an available subcarrier range and modulation symbols on the subcarriers.
2. The synchronous acquisition and processing method of the state information of the low-voltage power grid according to claim 1, wherein after the intelligent monitoring terminal responds the decryption status of the request command to the distribution transformer monitoring and metering terminal module, if the request command is decrypted without errors, the intelligent monitoring terminal transmits the encrypted monitoring result value to the distribution transformer monitoring and metering terminal module under the condition of the subcarrier set by the request command and the modulation symbol on the subcarrier.
3. The method for synchronously acquiring and processing the state information of the low-voltage power grid according to claim 2, wherein after the request instruction is transmitted to the intelligent monitoring terminal again according to a mode that the request instruction is set in advance to be transmitted again, if the request instruction is transmitted to the intelligent monitoring terminal, the distribution transformer monitoring and metering terminal module receives the encrypted monitoring result value transmitted by the intelligent monitoring terminal under the transmission condition of the subcarrier set by the request instruction and the modulation symbol on the subcarrier, so that the distribution transformer monitoring and metering terminal module forwards the encrypted monitoring result value to the power supply monitoring system for decryption.
4. The method for synchronously acquiring and processing the state information of the low-voltage power grid according to claim 1, wherein the unit operating on the intelligent monitoring terminal of the low-voltage power grid comprises:
the first transceiving unit is used for receiving the encrypted request instruction transmitted by the distribution transformer monitoring and metering terminal unit;
a first processing unit, configured to decrypt the encrypted request instruction;
the first transceiver unit is further used for responding the decryption condition of the encrypted request command to the distribution transformer monitoring and metering terminal unit.
5. The synchronous acquisition and processing method of the low-voltage power grid status information according to claim 4, wherein the first transceiver unit is further configured to:
if the request instruction is decrypted without errors, transmitting an encrypted monitoring result value to the distribution transformer monitoring and metering terminal module under the condition of the subcarrier set by the request instruction and the modulation symbol on the subcarrier;
the specific way of retransmitting the request command to the smart monitoring terminal according to the preset mode of retransmitting the request command can be as follows: the distribution transformer monitoring and metering terminal module respectively transmits request instructions under the transmission conditions of a preset number of subcarriers selected from an available subcarrier range and modulation symbols on the subcarriers.
6. The method for synchronously acquiring and processing the state information of the low-voltage power grid according to claim 4, wherein the unit operating in the distribution transformer monitoring and metering terminal module comprises:
the timing unit is used for timing to a set time interval;
the second transceiving unit is used for transmitting a request instruction to the intelligent monitoring terminal;
the second processing unit is used for confirming that the request instruction is transmitted if a decryption condition which indicates that the request instruction is decrypted without errors and is transmitted by the intelligent monitoring terminal is received; otherwise, activating the second handling unit to transmit the request command to the intelligent monitoring terminal again according to the mode of transmitting the request command again set in advance.
7. The synchronous acquisition and processing method for the low-voltage power grid status information according to claim 6, wherein the second disposal unit is specifically configured to:
and activating the second transceiver unit to select a set number of subcarriers and modulation symbols on the subcarriers in a subcarrier range, and respectively transmitting the request command according to the transmission conditions.
8. The method for synchronously acquiring and processing the state information of the low-voltage power grid according to claim 1, wherein the intelligent monitoring terminal comprises a 16-bit singlechip connected with a first GPRS module, the distribution transformer monitoring and metering terminal module comprises an encrypted monitoring result value processor connected with a second GPRS module serving as an encrypted monitoring result value remote transmission module, and the power supply monitoring system is a computer in a GPRS network.
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| CN110995785A (en) * | 2019-11-07 | 2020-04-10 | 珠海许继芝电网自动化有限公司 | Low-voltage distribution network cloud platform based on Internet of things |
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| CN202840683U (en) * | 2012-07-31 | 2013-03-27 | 湖南斯凯电气有限公司 | Low-voltage grid intelligent distribution transformer terminal |
| CN108173344A (en) * | 2017-12-29 | 2018-06-15 | 浙江亿安电力电子科技有限公司 | LORA wireless communication techniques are in the application process of low-voltage distribution transformer platform district |
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