CN113176466A - Electric energy quality monitoring system of intelligent electric meter - Google Patents
Electric energy quality monitoring system of intelligent electric meter Download PDFInfo
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Abstract
The invention discloses a power quality monitoring system of an intelligent ammeter, which comprises: the system comprises an electric energy acquisition terminal, a cloud server and a man-machine interaction system; the electric energy acquisition terminal is communicated with a cloud server through a base station, and the cloud server is directly communicated with the human-computer interaction system; the electric energy collection terminal includes: the device comprises a core board, an expansion board and an external sensor; the expansion board is connected with the core board through a GEC interface, and the expansion board is connected with the external sensor through a universal interface; the core board comprises an MCU and a communication module connected with the MCU through a fixed interface; the expansion board comprises a photosensitive sensor, a thermosensitive sensor, a program downloading interface, a power interface and a working indicator light; the external sensor comprises an LCD display and a power grid data sampling sensor. The power quality monitoring man-machine interaction system can be built quickly, and the development efficiency of the embedded system is improved. The electric energy quality monitoring system of the intelligent electric meter can receive various data and efficiently display the specified data to the user by utilizing the graphical interface.
Description
Technical Field
The invention relates to the technical field of intelligent electric meters, in particular to an electric energy quality monitoring system of an intelligent electric meter.
Background
The electric energy meter technology in China has more than 70 years of history up to now. In 1952, Shanghai and adult electrical equipment factories started to produce electric energy meters professionally, and at the moment, the electric energy meters imitating foreign induction systems were mainly used. In the early 60 s, China began to design electric energy meters by oneself. In the middle and later 70 s, the manufacturing technology of foreign advanced electric energy meters is introduced. In the early 90 s, the domestic electronic electric energy meter was successfully developed. In recent years, power grid assets and services are continuously digitalized, the technology of the internet of things is gradually deeply integrated with the power equipment sensing technology, the system of the internet of things of power grid equipment begins to appear, and information begins to be interconnected and intercommunicated.
The intelligent electric meter is an intelligent terminal of an intelligent power grid, has the functions of bidirectional multi-rate metering, user side control, bidirectional data communication in multiple data transmission modes, electricity larceny prevention and other intelligent functions in order to adapt to the use of the intelligent power grid and new energy besides the metering function of basic electricity consumption of the traditional electric meter, and represents the development direction of future intelligent terminals of end users of the energy-saving intelligent power grid.
According to the existing intelligent electric meter, quality monitoring of electric energy is usually realized by manual regular inspection, and an intelligent automatic monitoring mode is not available.
Disclosure of Invention
The purpose of the invention is realized by the following technical scheme.
The invention provides a power quality monitoring system of an intelligent ammeter, which comprises:
the system comprises an electric energy acquisition terminal, a cloud server and a man-machine interaction system; the electric energy acquisition terminal is communicated with a cloud server through a base station, and the cloud server is directly communicated with the human-computer interaction system;
the electric energy collection terminal includes: the device comprises a core board, an expansion board and an external sensor; the expansion board is connected with the core board through a GEC interface, and the expansion board is connected with the external sensor through a universal interface; the core board comprises an MCU and a communication module connected with the MCU through a fixed interface; the expansion board comprises a photosensitive sensor, a thermosensitive sensor, a program downloading interface, a power interface and a working indicator light; the external sensor comprises an LCD display and a power grid data sampling sensor.
Further, the power grid data sampling sensor adopts an HT7036 metering chip.
Further, the MCU adopts an STM32L431 chip.
Further, the communication module adopts an ME3616 communication module.
Further, the data of the power collecting terminal includes U2, U3, U4, U5 command frames.
Further, the U2 command frame simultaneously shows the device operation state, the power quality and the charging data.
Further, the U3 command frame is used to exhibit 2-38 harmonics.
Further, the U4 command frame is used for showing current, voltage, apparent power and apparent electric energy
Further, the U5 command frame uploads power quality indexes, active power, reactive power, apparent power and power data.
Further, the data frame format used by the power quality monitoring system is as follows: frame header, data length, IMSI, payload, checksum, and frame trailer.
The invention has the advantages that: the power quality monitoring man-machine interaction system can be built quickly, and the development efficiency of the embedded system is improved. The electric energy quality monitoring system of the intelligent electric meter can receive various data and efficiently display the specified data to the user by utilizing the graphical interface.
Drawings
Various other advantages and benefits will become apparent to those of ordinary skill in the art upon reading the following detailed description of the preferred embodiments. The drawings are only for purposes of illustrating the preferred embodiments and are not to be construed as limiting the invention. Also, like reference numerals are used to refer to like parts throughout the drawings. In the drawings:
fig. 1 shows a schematic diagram of a power quality monitoring system framework according to an embodiment of the invention.
Fig. 2 is a schematic diagram showing the hardware configuration and basic functions of the electric energy collection terminal according to the embodiment of the invention.
Fig. 3 shows a data frame format diagram of the power quality monitoring system.
Fig. 4 shows a schematic diagram of a grid-based information interface.
Fig. 5 shows a schematic diagram of a grid harmonic information interface.
Fig. 6 shows a schematic diagram of the U3 command frame data interface.
FIG. 7 shows a schematic diagram of a HT7036 uploading 2-38 subharmonic information display interface.
Fig. 8 shows a schematic diagram of the U4 command frame data interface.
Fig. 9 shows a schematic diagram of the U5 command frame data interface.
Fig. 10 shows a schematic diagram of a charging data interface corresponding to the U4 command frame.
Fig. 11 shows a schematic diagram of a U5 command frame corresponding data interface.
Detailed Description
Exemplary embodiments of the present disclosure will be described in more detail below with reference to the accompanying drawings. While exemplary embodiments of the present disclosure are shown in the drawings, it should be understood that the present disclosure may be embodied in various forms and should not be limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the disclosure to those skilled in the art.
The invention firstly carries out overall analysis on the power quality monitoring system, and clarifies data processing logic and data receiving logic of the human-computer interaction system. And then, based on the AHL NB-IoT man-machine interaction system, the power quality man-machine interaction system is quickly built, a cloud server, webpage design and the like of the power quality system are introduced in detail, and a main function interface of the man-machine interaction system is provided.
1 Power quality monitoring System Overall analysis
The power quality monitoring system multiplexes AHL NB-IoT architecture human-computer interaction software, and a power quality monitoring system framework is shown in fig. 1 and includes: the system comprises an electric energy acquisition terminal, a cloud server and a man-machine interaction system; the electric energy acquisition terminal is communicated with the cloud server through the base station, and the cloud server is directly communicated with the man-machine interaction system.
As shown in fig. 2, the electric energy collection terminal of the present invention includes: the device comprises a core board, an expansion board and an external sensor; the expansion board is connected with the core board through a GEC interface, and the expansion board is connected with the external sensor through a universal interface; the core board comprises an MCU and a communication module connected with the MCU through a fixed interface; the expansion board comprises a photosensitive sensor, a thermosensitive sensor, a program downloading interface, a power interface and a working indicator light; the external sensor comprises an LCD display and a power grid data sampling sensor.
The power grid data sampling sensor adopts an HT7036 metering chip. The MCU adopts an STM32L431 chip. The communication module adopts an ME3616 communication module.
In order to carry out rapid development, the power quality acquisition terminal is additionally provided with U2, U3, U4 and U5 command frames to upload power grid quality information. The uploaded information of the U2 command frame is the most detailed, the U2 command frame comprises all fields of the U4 command frame and the U5 command frame, the U3 command frame is mainly used for displaying 2-38 harmonics, and the U4 command frame is mainly used for displaying current, voltage, apparent power and apparent electric energy and can be used for charging electric energy. The U5 command frame uploads power quality indicators, active, reactive, apparent power and power data. The uploading of active and reactive data can be used for judging whether the tested power equipment works normally, and the electric energy quality index can be used for judging the quality of a power grid. The U2 command frame simultaneously shows the running state, power quality and charging data of the equipment. In order to receive the command frames from U2 to U5, the cloud server needs to add the < command > </command > key value pair, the < frame > </frame > tag needs to add the power grid data field tag, and the webpage does not need to be changed. During data processing, a harmonic data display area is added to a cloud server data receiving interface, and when a createLabel method is called by a cloud server, a line graph is added to a specified area after harmonic fields are recorded. And similarly, the web page terminal onmessage event processing method.
The electric energy data acquisition is mainly realized by an external sensor, and the external sensor uses a voltage division circuit and is connected in parallel to a three-phase power grid when voltage sampling is carried out. When current data acquisition is carried out, a current transformer with 0.2-level precision is used. Compared with a voltage transformer, the voltage division circuit is low in cost. The direct access type current sampling needs a series connection mode, the access difficulty is high, and therefore a current transformer is selected for sampling. And uploading the data to a cloud server by using a narrow band, and directly accessing the cloud data by a user through a webpage. And a narrow-band communication mode is used, so that the line cost is reduced. A user accesses the cloud data through a webpage, installation of a client program is avoided, and popularization of the system is facilitated.
2 Power quality system cloud server design
The power quality cloud server is based on an AHL NB-IoT framework, and command frames of U2, U3 and U4 are added to upload power grid quality information. The data frame format used by the power quality monitoring system is as follows: the specific content of the header (2 bytes), the data length (2 bytes), the IMSI (15 bytes), the valid data (n bytes), the checksum (2 bytes), and the trailer (2 bytes) is as shown in fig. 3 below.
The cloud server further processes the structured data, displays the data in a dynamic chart, and improves data processing efficiency. The U2 command frame used by the cloud server and the client for communication correspondingly comprises information of content rates of various currents and 2-21 harmonic waves and power grid data information of various voltages, currents, powers and the like.
The U3 command frame contains information about the subharmonic content of the current and voltage of the power grid. The HT7036 can measure 41-th harmonic information at the highest, but the maximum byte number which can be uploaded by the ME3616 narrowband communication module at a single time is 512 bytes, the combination of the 41-th harmonic content information of each item of the power grid, the terminal information and the frame format information is far more than 512 bytes, and finally only 2-38-th harmonic information (456 bytes) is uploaded, and the terminal information only uploads IMSI numbers, sending time, chip temperature and the like (30 bytes).
The U2 command frame used by the cloud server to communicate with the client is shown in table 1 below.
Table 1U 2 command frame specific data
The U2 command frame has more corresponding data fields, and if the cloud server system does not change, a large number of text boxes can be automatically generated. The harmonic information of the power grid occupies 120 fields, 40 lines of space are used for displaying, and the page turning is needed for several times. The automatically generated A-phase harmonic voltage content rate information almost occupies a real-time data display area of the cloud server, and is not beneficial to a user to extract effective messages. Therefore, the real-time data display area is divided into two overlapped parts, one part displays basic information and the other part displays harmonic information.
In addition, the harmonic content of the power grid system only needs to meet the national standard that the even order is not more than 2 percent and the odd order is not more than 4 percent. The three-phase current and voltage 2-21 harmonic content rate comprises 120 pieces of information, and the information is inconvenient to view in a text form, so that the harmonic information is displayed in a line graph form. The improved cloud server interface corresponding to the U2 command frame is shown in fig. 4 and 5 below. Fig. 4 shows mainly information of current, voltage, power, electric energy, etc. The resultant current shown in fig. 4 is the vector sum of A, B, C three-phase currents, and the active power data is the product of voltage data, current data and equipment power factor.
FIG. 5 shows primarily the 2-21 harmonic information. The public power grid harmonic wave standard is released in 1993 in 7, 31 and specifies a 0.38kV nominal power grid, the odd harmonic wave content rate is not more than 4 percent, and the even harmonic wave content rate is not more than 2 percent[51]. The national grid frequency is 50Hz, 1-time harmonic wave, namely fundamental wave, and the frequency, namely 50Hz content is 100%. 2 nd harmonic, i.e., 100Hz waveform; the nth harmonic, i.e., the 50nHz waveform.
In the graph of fig. 5, the ordinate is ten-thousandth system, and normally, the peak band is the odd harmonic content, the left part is the three-phase voltage harmonic content, and the right part is the three-phase current harmonic content. The peak value should not exceed 400 and the trough value should not exceed 200. Otherwise, the harmonic content of the power grid is abnormal.
The U3 command frame is mainly used for uploading power grid harmonic detailed data information, and a basic information interface of the U3 command frame is shown in the following FIG. 6.
The electric meter terminal can upload 2-38 harmonic content information, and the corresponding interface is shown in the following figure 7. The left side of the interface shows A, B, C three-phase voltage harmonic content information, and the right side of the interface shows A, B, C three-phase current harmonic content information.
The specific format of the U3 command frame for uploading the 2-38 th harmonic information is shown in the following table 2. The chip temperature in the U3 command frame can be used for judging whether the electric meter terminal works normally, and the sending time can be used for inquiring data information according to the time.
The U4 command frame is used for charging the electric energy data, uploading current, voltage, power and electric energy data, and the apparent power is the product of the current and the voltage. The data fields corresponding to the U4 and U5 command frames are a subset of the U2 command frames, the U4 and U5 command frame fields are not listed one by one, and the U4 command frame corresponds to the cloud server interface as shown in fig. 8 below.
The U5 command frame is used for uploading power, power data and power quality index data. When the power equipment normally works, the active power, the reactive power and the apparent power are basically kept constant, and a user can judge the ageing condition of the equipment according to the change of power data. The power quality condition can be judged according to the voltage deviation and harmonic data. The harmonic data processing logic of the U5 command frame is consistent with the U2 command frame and will not be described, and the data interface corresponding to the U5 command frame is shown in FIG. 9 below.
3 electric energy quality system
The power quality system is mainly realized by using an XML language, the XML language is an important markup language, the structured data is expressed by using a text format, the dynamic loading of the webpage is realized by using the XML language, and a large amount of time is saved for system development. The design of the power quality system follows the AHL NB-IoT architecture webpage design idea, the data transmission logics are completely consistent, and the left side of the webpage display interface of the power grid data corresponding to the U2 command frame comprises charging information such as current, voltage, power and power quality index information such as voltage fluctuation and three-phase voltage unbalance. The right side is the data of 2-21 harmonic content of split-phase voltage and current.
And when receiving the data sent by the cloud server, the terminal webpage program successfully establishing connection with the cloud server converts the JSON character string into a JSON object, extracts effective information in the JSON object, and splices the JSON object to generate a dynamically displayed webpage interface.
In order to avoid the situation that a large number of text boxes automatically appear and a user cannot acquire effective information in time, a Highcharts component is introduced, and the harmonic content is displayed on the right side of the interface in a visual line graph mode.
The realization logic of other interfaces of the power quality system is similar to that of a webpage real-time data display interface, and the power quality system real-time interface also displays detailed harmonic data of a power grid. In a data interface corresponding to a U3 command frame uploaded by a terminal using an HT7036 chip, the vertical coordinate of the interface is percentile data, fold lines with different colors represent different harmonic data, and when a mouse point reaches a certain point on the fold line graph, a specific numerical value corresponding to the harmonic content rate is displayed.
The charging data corresponding to the U4 command frame is shown in fig. 10 below.
The U5 command frame corresponds to the device active and reactive data, and the power quality data is shown in fig. 11 below.
The above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope of the present invention are included in the scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the appended claims.
Claims (10)
1. The utility model provides a smart electric meter's electric energy quality monitoring system which characterized in that includes:
the system comprises an electric energy acquisition terminal, a cloud server and a man-machine interaction system; the electric energy acquisition terminal is communicated with a cloud server through a base station, and the cloud server is directly communicated with the human-computer interaction system;
the electric energy collection terminal includes: the device comprises a core board, an expansion board and an external sensor; the expansion board is connected with the core board through a GEC interface, and the expansion board is connected with the external sensor through a universal interface; the core board comprises an MCU and a communication module connected with the MCU through a fixed interface; the expansion board comprises a photosensitive sensor, a thermosensitive sensor, a program downloading interface, a power interface and a working indicator light; the external sensor comprises an LCD display and a power grid data sampling sensor.
2. The power quality monitoring system of claim 1,
the power grid data sampling sensor adopts an HT7036 metering chip.
3. The power quality monitoring system of claim 1,
the MCU adopts an STM32L431 chip.
4. The power quality monitoring system of claim 1,
the communication module adopts an ME3616 communication module.
5. The power quality monitoring system of claim 1,
the data of the power collecting terminal includes U2, U3, U4, U5 command frames.
6. A power quality monitoring system according to claim 5,
the U2 command frame simultaneously shows the running state, the power quality and the charging data of the equipment.
7. A power quality monitoring system according to claim 5,
the U3 command frame is used for exhibiting 2-38 th harmonics.
8. A power quality monitoring system according to claim 5,
the U4 command frame is used to show current, voltage, apparent power.
9. A power quality monitoring system according to claim 5,
and the U5 command frame uploads power quality indexes, active power, reactive power, apparent power and power data.
10. The power quality monitoring system according to any one of claims 6 to 9,
the data frame format used by the power quality monitoring system is as follows: frame header, data length, IMSI, payload, checksum, and frame trailer.
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| CN202110563441.2A CN113176466A (en) | 2021-05-24 | 2021-05-24 | Electric energy quality monitoring system of intelligent electric meter |
| PCT/CN2021/121515 WO2022247087A1 (en) | 2021-05-24 | 2021-09-29 | Electric energy quality monitoring system of smart meter |
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Application publication date: 20210727 |