Complex-ratio wide-range online intelligent monitoring system based on Beidou short message communication

Abstract

The invention provides a complex-ratio wide-range online intelligent monitoring system based on Beidou short message communication. The complex-ratio wide-range online intelligent monitoring system comprises a complex-ratio online conversion intelligent controller ZKY, a power module P, a Beidou communication terminal BDF and a Beidou intelligent monitoring module BDS. The method has the beneficial effects that the transformation ratio of the mutual inductor is switched under the condition of uninterruptible power supply, the problems of large errors in the metering process, and the accuracy and stability of data acquisition, monitoring and real-time communication in remote areas, complex environments and areas lacking communication infrastructures are solved, and the reliability and safety of equipment are improved.

Description

Technical Field

[0001] The present invention relates to the field of electromechanics, and in particular to a complex ratio wide range online intelligent monitoring system based on Beidou short message communication. Background Art

[0002] At present, the power metering device circuit only has a single ratio or double ratio current transformer designed for rated load power generation (consumption). Only one ratio current transformer is installed on site at one time. It is strictly forbidden to change the ratio after power is turned on because the secondary open circuit is very dangerous to the power grid. If the current transformer ratio needs to be replaced, the power must be turned off. It is very dangerous to replace the ratio by manually short-circuiting the secondary jumper, which is not allowed by safety regulations. The current transformers used for power metering are all S-class, and are generally designed to operate within the range of 20% to 120% of their ratio rated current. According to the national standard of the People's Republic of China "GB 20840.2-2014 Transformers Part 2 Supplementary Technical Requirements for Current Transformers" and the Metrology Verification Regulations of the People's Republic of China "JJG1189.3-2022 Transformers for Measurement Part 3 Power Current Transformers", the error limit of the S-class current transformer in this range is linear and stable. When it exceeds the range of 20% to 120%, the error of the current transformer becomes larger. Sometimes the current exceeds several to hundreds of times, such as the generation and consumption of wind (hydro) power, or the heating and non-heating periods, or the seasonal power load changes of enterprises that start periodically. Usually the transformation ratio needs to change between 5 and 50 times, which is far beyond the measurable range of the current transformer, resulting in missed metering and energy waste during low load or overload. Adding two metering systems requires additional land space and metering equipment, which also increases the number of failure points and operation and maintenance costs, and does not comply with current national standards and regulations.

[0003] Some power management departments now use compound double-ratio current transformers or multi-ratio current transformers. When converting the ratio of compound ratio current transformers, a series of manual operations such as power outages and rewiring are required, which brings inconvenience and economic losses to electricity users and requires a lot of time and manpower.

[0004] At the same time, traditional remote power monitoring systems often face problems such as insufficient power supply and incomplete network coverage in remote areas or complex environments, which greatly reduces the monitoring effect. As a satellite navigation system independently built and operated by my country, the Beidou satellite navigation system has high-precision positioning and short message communication functions, which are particularly suitable for data communication and monitoring in such special environments. Beidou short message communication can not only realize data transmission in areas without public network coverage, but also has a high degree of security and reliability.

[0005] Therefore, it is necessary to design a multi-range online intelligent monitoring system for electricity metering based on Beidou short messages to solve the problems of large errors in the metering process and data collection, monitoring and real-time communication in remote areas, complex environments and areas with lack of communication infrastructure. Summary of the invention

[0006] The present invention proposes a complex ratio wide range online intelligent monitoring system based on Beidou short message communication, which solves the above-mentioned problems in the prior art.

[0007] The technical solution of the present invention is achieved in this way:

[0008] A composite ratio wide range online intelligent monitoring system based on Beidou short message communication, comprising:

[0009] The compound ratio online conversion intelligent controller ZKY comprises a sampling voltage transformer Vg connected in cascade with the three-phase voltage transformer VT in the electric energy metering device DJL, the sampling voltage transformer Vg amplifies the sampled voltage signal U through the first amplifier VA, and then filters it through the first filter Lv to pass it to the analog-to-digital converter AD; it also comprises a sampling current transformer Lg connected in cascade with the compound ratio current transformer CT of the A and C phases in the electric energy metering device DJL, the sampling current transformer Lg converts the current signal sampled by each phase into a voltage signal Ui through a sampling resistor R, and the voltage signal Ui is amplified by the second amplifier IA and filtered by the second filter Li to pass it to the analog-to-digital converter AD; the analog-to-digital converter AD simultaneously transmits the amplified and filtered voltage signals U and Ui to the microprocessor MCU through the data bus; the output end of the microprocessor MCU is connected with the A and C phase normally open contact relays J1 and J3 and the A and C phase normally closed contact relays J2 and J4;

[0010] The normally open contacts of the A-phase and C-phase normally open contact relays J1 and J3 are respectively connected in series to the small ratio output line terminals of the A-phase and C-phase composite ratio current transformers CT in the electric energy metering device DJL;

[0011] The normally closed contacts of the normally closed contact relays J2 and J4 of phases A and C are respectively connected in series to the large transformation ratio output line terminals of the composite transformation ratio current transformers CT of phases A and C in the electric energy metering device DJL;

[0012] The microprocessor MCU presets the current lower limit value and the current upper limit value;

[0013] The microprocessor MCU determines the current amplitude through Ui and sampling resistor R.

[0014] Beidou communication terminal BDF, including data acquisition module SC, communication management module XG and terminal communication module FS;

[0015] The data acquisition module SC is electrically connected to the RS485 port of the electric energy metering device DJL to obtain electric energy data;

[0016] The communication management module XG is used to organize and encrypt the plain text power data obtained by the data acquisition module SC into ciphertext in the form of Beidou short message;

[0017] The terminal communication module FS is used to send the encrypted ciphertext of the communication management module XG and receive the command information of the Beidou intelligent monitoring module BDS.

[0018] The power module P is electrically connected to the Beidou communication terminal BDF. Its function is to provide reliable power supply for the Beidou communication terminal BDF in harsh outdoor environments, including:

[0019] Backup battery DC for storing electrical energy;

[0020] The battery charger CDQ is electrically connected to the backup battery DC and is used to convert the city power into direct current to replenish the backup battery DC with electric energy;

[0021] Photovoltaic panels GFB, used to convert solar energy into electrical energy;

[0022] The photovoltaic inverter NB is electrically connected to the photovoltaic panel GFB, and is used to convert the direct current generated by the photovoltaic panel GFB into standard 220V alternating current, and then replenish the backup battery DC through the battery charger CDQ;

[0023] Small wind turbine FD, used to convert wind energy into electrical energy;

[0024] The wind turbine controller FDK is electrically connected to the small wind turbine FD and is used to convert the electric energy generated by the small wind turbine FDK into standard 220V AC power, and then replenish the backup battery DC through the battery charger CDQ.

[0025] Beidou intelligent monitoring module BDS, including:

[0026] The monitoring terminal communication module JKT is used to establish communication with the terminal communication module FS of the Beidou communication terminal BDF, send command information and receive communication data;

[0027] The key management module MS is used to generate public keys and private keys in batches and store them in the database of the key management module MS;

[0028] The data decryption module JM is used to decrypt the encrypted electric energy data transmitted by the Beidou communication terminal BDF obtained by the monitoring terminal communication module JKT;

[0029] After the intelligent monitoring module ZNK obtains a set of public keys and private keys generated by the key management module MS, it first establishes communication with the Beidou data terminal BDF through the monitoring end communication module JKT, and distributes the public key to a Beidou data terminal BDF. The communication management module XG of the Beidou data terminal BDF stores this public key, and uses the public key to encrypt the electric energy data collected by the data acquisition module SC, and then sends it through the terminal communication module FS of the Beidou communication terminal BDF; after the monitoring end communication module JKT receives the encrypted electric energy data, it is handed over to the data decryption module JM for processing; the data decryption module JM decrypts the encrypted electric energy data through the private key corresponding to the public key to obtain the plain text information.

[0030] Preferably, a plurality of Beidou cards are arranged in the monitoring end communication module JKT.

[0031] Preferably, the key management module MS periodically changes the keys in its database.

[0032] Preferably, the method for the key management module MS to generate and replace keys is: the intelligent monitoring module ZNK establishes communication with the Beidou data terminal BDF through the monitoring end communication module JKT, the data acquisition module SC randomly collects a group of electric energy data and transmits it back to the Beidou intelligent monitoring module BDS, and the key management module MS processes the group of randomly collected electric energy data and generates new keys in batches.

[0033] The beneficial effects of the present invention are: realizing the switching of the transformer ratio without power outage, solving the large errors in the metering process, and the accuracy and stability of data collection, monitoring and real-time communication in remote areas, complex environments and areas with scarce communication infrastructure, thereby improving the reliability and safety of the equipment. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative labor.

[0035] Figure 1 It is a schematic diagram of the principle of an embodiment of the present invention;

[0036] Figure 2 The control principle diagram of the complex ratio online conversion intelligent controller in one embodiment of the present invention. DETAILED DESCRIPTION

[0037] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0038] As shown in the figure, the composite ratio wide range online intelligent monitoring system based on Beidou short message communication described in the present invention includes:

[0039] The compound ratio online conversion intelligent controller ZKY comprises a sampling voltage transformer Vg connected in cascade with the three-phase voltage transformer VT in the electric energy metering device DJL, the sampling voltage transformer Vg amplifies the sampled voltage signal U through the first amplifier VA, and then filters it through the first filter Lv to pass it to the analog-to-digital converter AD; it also comprises a sampling current transformer Lg connected in cascade with the compound ratio current transformer CT of the A and C phases in the electric energy metering device DJL, the sampling current transformer Lg converts the current signal sampled by each phase into a voltage signal Ui through a sampling resistor R, and the voltage signal Ui is amplified by the second amplifier IA and filtered by the second filter Li to pass it to the analog-to-digital converter AD; the analog-to-digital converter AD simultaneously transmits the amplified and filtered voltage signals U and Ui to the microprocessor MCU through the data bus; the output end of the microprocessor MCU is connected with the A and C phase normally open contact relays J1 and J3 and the A and C phase normally closed contact relays J2 and J4;

[0040] The normally open contacts of the B-phase and C-phase normally open contact relays J1 and J3 are respectively connected in series to the small ratio output line terminals of the A-phase and C-phase composite ratio current transformers CT in the electric energy metering device DJL;

[0041] The normally closed contacts of the normally closed contact relays J2 and J4 of phases A and C are respectively connected in series to the large transformation ratio output line terminals of the composite transformation ratio current transformers CT of phases A and C in the electric energy metering device DJL;

[0042] The microprocessor MCU presets the current lower limit value and the current upper limit value;

[0043] The microprocessor MCU determines the current amplitude through Ui and sampling resistor R;

[0044] The switch-on and switch-off interface of the special transformer collection terminal Zc in the electric energy metering device DJL is electrically connected to the microprocessor MCU;

[0045] When the current amplitude determined according to the voltage signal Ui is less than the preset current lower limit, the microprocessor MCU energizes the A and C phase normally open contact relays J1 and J3, and their corresponding normally open contacts close, and at the same time, delays the energization of the A and C phase normally closed contact relays J2 and J4, and their corresponding normally closed contacts open with a delay, thereby converting the size ratio of the compound current transformer CT online in a safe state without secondary open circuit;

[0046] When the current amplitude determined by the voltage signal Ui is greater than the current upper limit setting value, the microprocessor MCU makes the A and C phase normally closed contact relays J2 and J4 de-energized, and the corresponding normally closed contacts close, so that the A and C phase normally open contact relays J1 and J3 are delayed to de-energize, and the corresponding normally open contacts are delayed to open, thereby converting the small and large transformation ratios of the compound current transformer CT online in a safe state without secondary open circuit.

[0047] Beidou communication terminal BDF, including data acquisition module SC, communication management module XG and terminal communication module FS;

[0048] The data acquisition module SC is used to obtain the electric energy data measured by the electric energy metering device DJL;

[0049] The communication management module XG is used to organize and encrypt the plain text power data obtained by the data acquisition module SC into ciphertext in the form of Beidou short message;

[0050] The terminal communication module FS is used to send the encrypted ciphertext of the communication management module XG and receive the command information of the Beidou intelligent monitoring module BDS.

[0051] The power module P is electrically connected to the Beidou communication terminal BDF. Its function is to provide reliable power supply for the Beidou communication terminal BDF in harsh outdoor environments, including:

[0052] Backup battery DC for storing electrical energy;

[0053] The battery charger CDQ is electrically connected to the backup battery DC and is used to convert the city power into direct current to replenish the backup battery DC with electric energy;

[0054] Photovoltaic panels GFB, used to convert solar energy into electrical energy;

[0055] The photovoltaic inverter NB is electrically connected to the photovoltaic panel GFB, and is used to convert the direct current generated by the photovoltaic panel GFB into standard 220V alternating current, and then replenish the backup battery DC through the battery charger CDQ;

[0056] Small wind turbine FD, used to convert wind energy into electrical energy;

[0057] The wind turbine controller FDK is electrically connected to the small wind turbine FD and is used to convert the electric energy generated by the small wind turbine FDK into standard 220V AC power, and then replenish the backup battery DC through the battery charger CDQ.

[0058] Beidou intelligent monitoring module BDS, including monitoring terminal communication module JKT, key management module MS, data decryption module JM and intelligent monitoring module ZNK;

[0059] The monitoring terminal communication module JKT is used to establish communication with the terminal communication module FS of the Beidou communication terminal BDF, send command information and receive communication data;

[0060] The key management module MS is used to generate public keys and private keys in batches and store them in the database of the key management module MS;

[0061] The data decryption module JM is used to decrypt the encrypted electric energy data transmitted by the Beidou communication terminal BDF obtained by the monitoring terminal communication module JKT;

[0062] After the intelligent monitoring module ZNK obtains a set of public keys and private keys generated by the key management module MS, it first establishes communication with the Beidou data terminal BDF through the monitoring end communication module JKT, and distributes the public key to a Beidou data terminal BDF. The communication management module XG of the Beidou data terminal BDF stores this public key, and uses the public key to encrypt the electric energy data collected by the data acquisition module SC, and then sends it through the terminal communication module FS of the Beidou communication terminal BDF; after the monitoring end communication module JKT receives the encrypted electric energy data, it is handed over to the data decryption module JM for processing; the data decryption module JM decrypts the encrypted electric energy data through the private key corresponding to the public key to obtain the plain text information.

[0063] The monitoring end communication module JKT is equipped with multiple Beidou cards to increase the communication bandwidth and data throughput.

[0064] The key management module MS periodically changes the keys in its database.

[0065] The method for the key management module MS to generate and change keys is as follows:

[0066] The intelligent monitoring module ZNK establishes communication with the Beidou data terminal BDF through the monitoring end communication module JKT. The data acquisition module SC randomly collects a set of power data and transmits it back to the Beidou intelligent monitoring module BDS. The key management module MS processes this set of randomly collected power data and generates new keys in batches.

[0067] The beneficial effects of the present invention are: realizing the switching of the transformer ratio without power outage, solving the large errors in the metering process, and the accuracy and stability of data collection, monitoring and real-time communication in remote areas, complex environments and areas with scarce communication infrastructure, thereby improving the reliability and safety of the equipment.

[0068] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A complex ratio wide range online intelligent monitoring system based on Beidou short message communication, characterized in that: include: The compound ratio online conversion intelligent controller ZKY comprises a sampling voltage transformer Vg connected in cascade with the three-phase voltage transformer VT in the electric energy metering device DJL, the sampling voltage transformer Vg amplifies the sampled voltage signal U through the first amplifier VA, and then filters it through the first filter Lv to pass it to the analog-to-digital converter AD; it also comprises a sampling current transformer Lg connected in cascade with the compound ratio current transformer CT of the A and C phases in the electric energy metering device DJL, the sampling current transformer Lg converts the current signal sampled by each phase into a voltage signal Ui through a sampling resistor R, and the voltage signal Ui is amplified by the second amplifier IA and filtered by the second filter Li to pass it to the analog-to-digital converter AD; the analog-to-digital converter AD simultaneously transmits the amplified and filtered voltage signals U and Ui to the microprocessor MCU through the data bus; the output end of the microprocessor MCU is connected with the A and C phase normally open contact relays J1 and J3 and the A and C phase normally closed contact relays J2 and J4; The normally open contacts of the A-phase and C-phase normally open contact relays J1 and J3 are respectively connected in series to the small ratio output line terminals of the A-phase and C-phase composite ratio current transformers CT in the electric energy metering device DJL; The normally closed contacts of the normally closed contact relays J2 and J4 of phases A and C are respectively connected in series to the large transformation ratio output line terminals of the composite transformation ratio current transformers CT of phases A and C in the electric energy metering device DJL; The microprocessor MCU presets the current lower limit value and the current upper limit value; The microprocessor MCU determines the current amplitude through Ui and sampling resistor R; Beidou communication terminal BDF, including data acquisition module SC, communication management module XG and terminal communication module FS; The data acquisition module SC is electrically connected to the RS485 port of the electric energy metering device DJL to obtain electric energy data; The communication management module XG is used to organize and encrypt the plain text power data obtained by the data acquisition module SC into ciphertext in the form of Beidou short message; The terminal communication module FS is used to send the encrypted ciphertext of the communication management module XG and receive the command information of the Beidou intelligent monitoring module BDS; The power module P is electrically connected to the Beidou communication terminal BDF. Its function is to provide reliable power supply for the Beidou communication terminal BDF in harsh field environments, including Backup battery DC for storing electrical energy; The battery charger CDQ is electrically connected to the backup battery DC and is used to convert the city power into direct current to replenish the backup battery DC with electric energy; Photovoltaic panels GFB, used to convert solar energy into electrical energy; The photovoltaic inverter NB is electrically connected to the photovoltaic panel GFB, and is used to convert the direct current generated by the photovoltaic panel GFB into standard 220V alternating current, and then replenish the backup battery DC through the battery charger CDQ; Small wind turbine FD, used to convert wind energy into electrical energy; The wind turbine controller FDK is electrically connected to the small wind turbine FD and is used to convert the electric energy generated by the small wind turbine FDK into a standard 220V alternating current, and then replenish the backup battery DC through the battery charger CDQ; Beidou intelligent monitoring module BDS, including The monitoring terminal communication module JKT is used to establish communication with the terminal communication module FS of the Beidou communication terminal BDF, send command information and receive communication data; The key management module MS is used to generate public keys and private keys in batches and store them in the database of the key management module MS; The data decryption module JM is used to decrypt the encrypted electric energy data transmitted by the Beidou communication terminal BDF obtained by the monitoring terminal communication module JKT; After obtaining a set of public and private keys generated by the key management module MS, the intelligent monitoring module ZNK first establishes communication with the Beidou data terminal BDF through the monitoring end communication module JKT, and distributes the public key to a Beidou data terminal BDF. The communication management module XG of the Beidou data terminal BDF stores the public key and uses the public key to encrypt the electric energy data collected by the data acquisition module SC, and then sends it through the terminal communication module FS of the Beidou communication terminal BDF; after the monitoring end communication module JKT receives the encrypted electric energy data, it is handed over to the data decryption module JM for processing; The data decryption module JM decrypts the encrypted electric energy data through the private key corresponding to the public key to obtain the plain text information.

2. The complex ratio wide range online intelligent monitoring system based on Beidou short message communication according to claim 1 is characterized in that: There are multiple Beidou cards set in the monitoring end communication module JKT.

3. The complex ratio wide range online intelligent monitoring system based on Beidou short message communication according to claim 1 is characterized in that: The key management module MS periodically changes the keys in its database.

4. The complex ratio wide range online intelligent monitoring system based on Beidou short message communication according to claim 1 is characterized in that: The method for the key management module MS to generate and replace keys is as follows: the intelligent monitoring module ZNK establishes communication with the Beidou data terminal BDF through the monitoring end communication module JKT, the data acquisition module SC randomly collects a group of electric energy data and transmits it back to the Beidou intelligent monitoring module BDS, and the key management module MS processes the group of randomly collected electric energy data and generates new keys in batches.

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