CN114660412A - Electric energy quality monitoring system based on intelligent electric energy meter and monitoring method thereof - Google Patents
Electric energy quality monitoring system based on intelligent electric energy meter and monitoring method thereof Download PDFInfo
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- CN114660412A CN114660412A CN202210307623.8A CN202210307623A CN114660412A CN 114660412 A CN114660412 A CN 114660412A CN 202210307623 A CN202210307623 A CN 202210307623A CN 114660412 A CN114660412 A CN 114660412A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/08—Locating faults in cables, transmission lines, or networks
- G01R31/081—Locating faults in cables, transmission lines, or networks according to type of conductors
- G01R31/086—Locating faults in cables, transmission lines, or networks according to type of conductors in power transmission or distribution networks, i.e. with interconnected conductors
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R22/00—Arrangements for measuring time integral of electric power or current, e.g. electricity meters
- G01R22/06—Arrangements for measuring time integral of electric power or current, e.g. electricity meters by electronic methods
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R22/00—Arrangements for measuring time integral of electric power or current, e.g. electricity meters
- G01R22/06—Arrangements for measuring time integral of electric power or current, e.g. electricity meters by electronic methods
- G01R22/061—Details of electronic electricity meters
- G01R22/063—Details of electronic electricity meters related to remote communication
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R22/00—Arrangements for measuring time integral of electric power or current, e.g. electricity meters
- G01R22/06—Arrangements for measuring time integral of electric power or current, e.g. electricity meters by electronic methods
- G01R22/061—Details of electronic electricity meters
- G01R22/065—Details of electronic electricity meters related to mechanical aspects
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R22/00—Arrangements for measuring time integral of electric power or current, e.g. electricity meters
- G01R22/06—Arrangements for measuring time integral of electric power or current, e.g. electricity meters by electronic methods
- G01R22/061—Details of electronic electricity meters
- G01R22/068—Arrangements for indicating or signaling faults
Abstract
The invention belongs to the field of power equipment, and particularly relates to an electric energy quality monitoring system based on an intelligent electric energy meter and a monitoring method thereof. The power quality monitoring system is used for monitoring the power quality of the power grid of the current node and timely sending early warning to the power grid control center when the power grid environment is abnormal. This electric energy meter quality monitoring system includes: the device comprises a communication module, a data acquisition unit, a storage module, an instruction receiving unit, an instruction response unit and an alarm module. The communication module is used for establishing communication connection between the intelligent electric energy meter and the master station server. The data acquisition unit is used for acquiring real-time power information. The storage module stores an algorithm program and basic data. The instruction receiving unit is used for receiving a request instruction. And the instruction response unit is used for executing an algorithm program in the intelligent electric energy meter to calculate the electric energy quality monitoring result. The invention solves the problems of low power quality monitoring efficiency, higher equipment cost and larger workload of the power grid.
Description
Technical Field
The invention belongs to the field of power equipment, and particularly relates to an electric energy quality monitoring system based on an intelligent electric energy meter and a monitoring method thereof.
Background
The power quality monitoring is to represent the basic operation condition of the power grid according to the collected real-time monitoring data, and further to analyze the problems of the power consumption of users, and to provide a power grid monitoring task which is helpful for the quick overhaul and power supply failure recovery of the power grid. With the rapid development of new energy power stations such as wind energy and solar energy, the new energy power stations are greatly influenced by natural factors, the grid connection rate of the electric energy with low stability is also continuously improved, the cleanness of the electric network is improved, and the electric energy quality in the electric network is greatly fluctuated. Therefore, power quality monitoring of the power grid becomes important. The power quality function of the existing power grid is mainly realized by special power monitoring equipment; the installation and application costs of these devices are high.
The intelligent electric meter is an intelligent terminal of an intelligent power grid, has the metering function of basic electricity consumption of the traditional electric meter, and continuously develops various functions such as intelligent functions of multi-rate metering, user side control, electricity larceny prevention, topology identification and the like under the development trend of the intelligent power grid and new energy, and represents the development direction of intelligent terminals of future energy-saving intelligent power grid users. With the rapid development of the intelligent power distribution network, the number of sensors and power electronic devices is continuously increased. The flooding of a number of network technologies (e.g., big data, cloud computing, etc.) into the grid has brought grid companies into a new phase of technological innovation. Therefore, how to realize power quality monitoring of the power grid based on the intelligent electric energy meter is a new direction for upgrading and upgrading the power grid and updating and developing a system.
However, at present, a new product available for application still appears, and the quality monitoring of the electric energy still needs to rely on operation and maintenance personnel to go to each relevant node for periodic inspection, find problems in time and collect terminal data to upload to the system. This results in that the electric energy quality of electric wire netting detects work and wastes time and energy, and efficiency is lower, can't discover the fault condition of electric wire netting in time.
Disclosure of Invention
The method and the device aim to solve the problems that the power quality monitoring efficiency of the power grid is low, the equipment cost is high and the workload of personnel is large in the existing method and equipment; the invention provides an electric energy quality monitoring system based on an intelligent electric energy meter and a monitoring method thereof.
The invention is realized by adopting the following technical scheme:
the utility model provides a power quality monitoring system based on intelligent ammeter, this power quality monitoring system install in intelligent ammeter for monitor the electric wire netting power quality of current node, and in time send the early warning to the electric wire netting control center when the electric wire netting environment is unusual. This electric energy meter quality monitoring system includes: the device comprises a communication module, a data acquisition unit, a storage module, an instruction receiving unit, an instruction response unit and an alarm module.
The communication module is used for establishing communication connection between the local intelligent electric energy meter and the remote master station server.
The data acquisition unit is used for acquiring various real-time electric power information measured by the measuring unit in the intelligent electric energy meter.
The storage module comprises a program storage unit and a data storage unit. And the program storage unit stores an algorithm program for analyzing and calculating various power quality monitoring indexes. The data storage unit is used for storing the real-time power information acquired by the data acquisition unit and calculating the result of the power quality monitoring index according to the real-time power information.
The instruction receiving unit is used for receiving an electric energy quality monitoring instruction which is issued by the master station server and forwarded by the main control module of the intelligent electric energy meter. And the instruction is subjected to security verification through the equipment identification code. The power quality monitoring instruction comprises one or more power quality monitoring indexes which are requested to be uploaded by the master station server; and executing the equipment identification code of the intelligent electric energy meter of the instruction.
And the instruction response unit is used for writing a corresponding algorithm program stored in the storage module into a processor RAM of a main control module of the intelligent electric energy meter according to the electric energy meter quality monitoring index item requested to be uploaded in the analyzed electric energy quality monitoring instruction after the electric energy quality monitoring instruction passes verification. When the main control module executes an algorithm program in the RAM, the main control module firstly calls power information required by each power quality monitoring index item to the metering unit; then calculating and analyzing the result of the corresponding power quality monitoring index; finally, the result is uploaded to a master station server through a communication module; and written into the data storage unit of the memory module.
The alarm unit is used for acquiring a real-time power quality monitoring result written in the storage module, comparing the monitoring result with a preset safety threshold value, and generating a corresponding safety early warning signal when any one real-time power quality monitoring result exceeds the safety threshold value.
As a further improvement of the invention, the power quality monitoring system is electrically connected with the main control module of the intelligent electric energy meter through the URAT interface. The data acquisition unit is electrically connected with the metering unit of the intelligent electric energy meter through the SPI interface, and then required real-time electric power information is obtained.
As a further improvement of the present invention, in the power quality monitoring system, the power information for analyzing the power quality includes: harmonic voltage, 2-50 times of current content, 2-50 times of harmonic current effective value, voltage total harmonic distortion, current total harmonic distortion, 2-50 times of harmonic phase angle, harmonic power, inter-harmonic voltage, 0.5-49.5 times of current content, 0.5-49.5 times of inter-harmonic current effective value.
As a further improvement of the invention, in the power quality monitoring system, the monitoring indexes of the power quality comprise a steady-state data index item and a transient-state data index item. Wherein the steady state data index items include: voltage deviation, frequency deviation, three-phase voltage or three-phase current imbalance, voltage fluctuation, flicker, harmonic data and inter-harmonic data. The harmonic data includes harmonic voltage or harmonic current content, harmonic current effective value, voltage total harmonic distortion rate, current total harmonic distortion rate, harmonic phase angle, and harmonic power. The inter-harmonic data includes inter-harmonic voltage or inter-harmonic current content, and inter-harmonic current effective value. The transient data index items include event data and valid value data. Event data includes voltage sags, and short interrupts. The valid value data refers to the valid value data of the trigger record.
As a further improvement of the invention, the electric energy quality monitoring system adopts a detachable module scheme to be electrically connected with a communication interface reserved in the existing intelligent electric energy meter. Under the installation state, the intelligent electric energy meter automatically configures the working state information of the corresponding module. The communication module in the power quality monitoring system adopts the existing functional module in the electric energy meter. The communication module adopts a functional module based on Ethernet, power carrier communication or digital mobile communication.
As another scheme of the invention, the power quality monitoring system adopts an integrated module scheme and is arranged in a main control module of the existing intelligent electric energy meter as a part of the hardware of the intelligent electric energy meter; the intelligent electric energy meter is provided with an electric energy quality monitoring function.
As another scheme of the invention, the safety early warning signal generated by the alarm unit is output to an alarm connected to the local end of the intelligent electric energy meter, and is used for driving the alarm to work. And the fault state of the power grid node corresponding to the electric energy meter is analyzed according to the electric energy quality monitoring result after the safety early warning information is received by the master station server, and a corresponding operation and maintenance decision scheme is issued to operation and maintenance management personnel.
As another scheme of the present invention, the power quality monitoring system further includes a data output interface, where the data output interface is used to connect to an external device, and further output a power quality evaluation result of the power grid of the current node generated by the system to the external device.
The invention also comprises a power quality monitoring method based on the intelligent electric energy meter, which is applied to the power quality monitoring system. The power quality monitoring method comprises the following processes:
and the master station server transmits an electric energy quality monitoring instruction to the intelligent electric energy meters at each node in the power grid according to a preset index sampling frequency.
And after receiving the power quality monitoring instruction, the electric energy meter forwards the instruction to an instruction receiving unit in the power quality monitoring module. The instruction receiving unit verifies the instruction. And after the verification is passed, the instruction response unit calls a corresponding algorithm program stored in the storage module according to the electric energy meter quality monitoring index item requested to be uploaded and contained in the analyzed instruction. And writing the algorithm program into an RAM of a processor in the electric energy meter main control module.
A main control module in the electric energy meter executes a corresponding algorithm program in an RAM, and in the program execution process, the main control module firstly acquires electric power information acquired by a metering unit; then calculating or analyzing a corresponding power quality monitoring index item according to the power information; and finally, sending the calculated power quality monitoring result to a remote master station server and storing the power quality monitoring result in a storage module.
The alarm module acquires each updated power quality monitoring index in real time, and generates a corresponding safety early warning signal when any power quality monitoring index exceeds a preset safety threshold.
As a further improvement of the invention, in the execution process of the algorithm program, the main control module further stores the acquired power information acquired by the metering unit into the storage module, and the power information is used as basic data in the power quality analysis result for data backup.
When the master station server or operation and maintenance management personnel request the power quality monitoring system to download the power quality monitoring reports of any period, the main control module of the power meter inquires related data in the data storage unit in the storage module and generates the required power quality monitoring reports according to the power information in the corresponding period and the calculated power quality monitoring data.
The technical scheme provided by the invention has the following beneficial effects:
the power grid power quality monitoring system and method based on the intelligent electric energy meter can acquire various electric power information measured by the electric energy meter in real time, automatically analyze and process related data of power quality indexes according to the request of the master station server, and obtain power instruction analysis results of power grid nodes corresponding to the electric energy meters. And timely reporting to the main station without service and management personnel when the electric energy instruction of the power grid is abnormal. And management personnel can conveniently handle the fault in the power grid or the abnormal state of the abnormal node.
The electric energy quality monitoring system provided by the invention can utilize the processor and the metering unit of the existing intelligent electric meter to complete the acquisition of electric energy quality monitoring data and the analysis and processing of monitoring results, so that the hardware cost of equipment is saved, and the electric energy quality monitoring system can be applied to the transformation and upgrading of the existing electric energy meter. The power quality monitoring module has the advantages of simple software structure and lower development cost; the existing communication interface of the electric energy meter can be used for communicating with the related module of the intelligent electric energy meter to complete the transmission of data and instructions, so that the product has higher universality.
After the system is applied, the abnormal indexes can be automatically counted and analyzed by the intelligent electric energy meter node, the abnormal control of the key indexes is realized, the data support is provided for the electric energy quality, and the good running of a power grid is guaranteed. Therefore, the method is very suitable for being applied to the clean energy grid connection process, realizes real-time power quality monitoring, and reduces the impact of the grid connection process on a power grid.
Drawings
The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the principles of the invention and not to limit the invention. In the drawings:
fig. 1 is a schematic block diagram of a power quality monitoring system based on an intelligent electric energy meter according to embodiment 1 of the present invention.
Fig. 2 is a schematic block diagram of an intelligent electric energy meter using an electric energy quality monitoring system in embodiment 1 of the present invention.
Fig. 3 is a schematic block diagram of an intelligent electric energy meter using an electric energy quality monitoring system in embodiment 1 of the present invention, in which a data output interface is added.
Fig. 4 is a flowchart of a power quality monitoring method based on an intelligent electric energy meter according to embodiment 2 of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
Example 1
The embodiment provides a power quality monitoring system based on an intelligent electric energy meter, and the power quality monitoring system is installed in the intelligent electric energy meter and used for monitoring the power grid power quality of a current node and timely sending out early warning to a power grid control center when the power grid environment is abnormal. As shown in fig. 1, the system for monitoring the quality of the electric energy meter comprises: the device comprises a communication module, a data acquisition unit, a storage module, an instruction receiving unit, an instruction response unit and an alarm module.
When the electric energy meter quality monitoring system of this embodiment is applied to an intelligent electric energy meter, a functional module of the electric energy quality monitoring system is electrically connected with a main control module of the intelligent electric energy meter through a URAT (Universal Asynchronous Receiver Transmitter) interface. The specific module connection relationship is shown in fig. 2.
As can be seen from fig. 2, the existing intelligent electric energy meter includes a plurality of signal acquisition units, such as: the device comprises a current channel sampling unit, a voltage channel sampling unit, a key detection unit, a cover opening detection unit, a magnetic field detection unit, a power failure and battery detection unit and a relay driving and detection unit. The system also comprises a data memory EEPROM connected with the main control module through an IIC (Inter-Integrated Circuit bus) Interface and another data memory FLASH connected through an SPI (Serial Peripheral Interface) Interface. In addition, the electric energy meter also comprises an LCD display module used for displaying the electric power metering data.
In this embodiment, the communication module is configured to establish a communication connection between the local intelligent electric energy meter and the remote master station server. The communication module in the power quality monitoring system adopts the existing functional module in the electric energy meter. The communication module adopts a functional module based on Ethernet, power carrier communication or digital mobile communication.
The data acquisition unit is used for acquiring various real-time electric power information measured by the measuring unit in the intelligent electric energy meter. Specifically, the data acquisition unit is connected with the metering unit electricity of intelligent ammeter through the SPI interface.
In the embodiment, the storage module is divided into two storage areas, wherein one storage area is a program storage unit, and the other storage area is a data storage unit. The program storage unit is equivalent to a firmware area, the read-write authority of the area is set to be a read-only mode, and data stored in the area cannot be erased and changed. The data in the data storage unit can be erased or read and written, and when the capacity of the data storage area is full, the newly written data can overwrite the earliest historical data. And an algorithm program for analyzing and calculating various electric energy quality monitoring indexes is stored in a program storage unit in the storage module. The data storage unit is used for storing the real-time power information acquired by the data acquisition unit and calculating the result of the power quality monitoring index according to the real-time power information.
The instruction receiving unit is used for receiving an electric energy quality monitoring instruction which is issued by the master station server and forwarded by the main control module of the intelligent electric energy meter. And the instruction is subjected to security verification through the equipment identification code.
In this embodiment, the power quality monitoring instruction includes one or more power quality monitoring indexes that the master station server requests to upload; and executing the equipment identification code of the intelligent electric energy meter of the instruction. And the master station server stores the equipment identification numbers of the intelligent electric energy meters corresponding to the network nodes in the power grid. And when the master station server needs to acquire the power quality of the power grid of any node, an electric energy instruction monitoring instruction is issued to the corresponding intelligent electric energy meter.
In the instruction verification process, the instruction receiving unit acquires the equipment identification number of the current electric energy meter and compares the equipment identification number with the equipment identification number contained in the electric energy quality monitoring instruction: if the two are the same, the verification is passed, and a power quality monitoring task is executed at the node of the intelligent electric energy meter. If the two are different, the verification is not passed, and the current electric energy meter does not execute the electric energy quality monitoring task.
And the instruction response unit is used for writing the corresponding algorithm program stored in the storage module into a processor RAM of the main control module of the intelligent electric energy meter according to the electric energy meter quality monitoring index item requested to be uploaded in the analyzed electric energy quality monitoring instruction after the electric energy quality monitoring instruction passes the verification. When the main control module executes an algorithm program in the RAM, the main control module firstly calls power information required by each power quality monitoring index item to the metering unit; then calculating and analyzing the result of the corresponding power quality monitoring index; finally, the result is uploaded to a master station server through a communication module; and written into the data storage unit of the memory module.
The alarm unit is used for acquiring a real-time power quality monitoring result written in the storage module, comparing the monitoring result with a preset safety threshold value, and generating a corresponding safety early warning signal when any one real-time power quality monitoring result exceeds the safety threshold value.
In the power quality monitoring system provided in the present embodiment, the power information for analyzing the power quality includes: harmonic voltage, 2-50 times of current content, 2-50 times of harmonic current effective value, voltage total harmonic distortion, current total harmonic distortion, 2-50 times of harmonic phase angle, harmonic power, inter-harmonic voltage, 0.5-49.5 times of current content, 0.5-49.5 times of inter-harmonic current effective value. As shown in table 1, the monitoring indexes of the power quality analyzed and calculated by the power quality monitoring system in this embodiment include a steady-state data index item and a transient-state data index item. Wherein the steady state data indicator items include: voltage deviation, frequency deviation, three-phase voltage or three-phase current imbalance, voltage fluctuation, flicker, harmonic data and inter-harmonic data. The harmonic data includes harmonic voltage or harmonic current content, harmonic current effective value, voltage total harmonic distortion rate, current total harmonic distortion rate, harmonic phase angle, and harmonic power. The inter-harmonic data includes inter-harmonic voltage or inter-harmonic current content, and inter-harmonic current effective value. The transient data index items include event data and valid value data. Event data includes voltage sags, and short interrupts. The effective value data refers to effective value data of the trigger record.
Table 1: functional classification of power quality monitoring system
Analyzing the system and method for monitoring the power quality of the power grid based on the intelligent electric energy meter provided by the embodiment can find that: according to the embodiment, each item of electric power information measured by the intelligent electric energy meter can be acquired in real time, and the related data of the electric energy quality index can be automatically analyzed and processed according to the request of the master station server, so that the electric energy instruction analysis result of the power grid node corresponding to each electric energy meter can be obtained. And timely reporting to the main station without service and management personnel when the electric energy instruction of the power grid is abnormal. And the management personnel can conveniently handle the fault in the power grid or the abnormal state of the abnormal node.
Because the electric energy quality monitoring system provided by the embodiment can utilize the processor and the metering unit of the existing intelligent electric meter to complete the acquisition of the electric energy quality monitoring data and the analysis and processing of the monitoring result, the hardware cost of the equipment is greatly saved. Meanwhile, the method can also be applied to the function upgrading and reconstruction of the existing electric energy meter.
Because the software structure of the power quality monitoring module that this embodiment provided is simple, development cost is lower. And the module can utilize the existing communication interface of electric energy meter and the relevant module communication of intelligent electric energy meter, accomplish the transmission of data and instruction, therefore make the product have higher commonality.
Based on the existing intelligent electric energy meter with complete functions, the electric energy quality detection system provided in this embodiment may adopt the following two different system configuration schemes in the application process.
The first scheme comprises the following steps: the electric energy quality monitoring system adopts a detachable module scheme to be electrically connected with a communication interface reserved in the existing intelligent electric energy meter. Under the installation state, the intelligent electric energy meter automatically configures the working state information of the corresponding module. In this solution, the power quality monitoring system acts as a plug-in additional function module. In the use, the installer of equipment installs this module on current intelligent ammeter to with serial ports and power supply interface and the corresponding interface connection in the intelligent ammeter in the module. After the connection is completed, the main control module of the intelligent electric energy meter automatically installs a corresponding driving program for the electric energy quality monitoring module, and then starts the electric energy quality monitoring function of the module.
The scheme has the advantages that the intelligent electric energy meter can be used for upgrading and transforming a large number of traditional intelligent electric energy meters, so that the existing system can realize the functions of remote monitoring of the electric energy quality of the power grid and early warning of faults. And the hardware cost for updating and upgrading the functions of the equipment in the transformer area is reduced.
Scheme II: the electric energy quality monitoring system adopts an integrated module scheme to be arranged in a main control module of the existing intelligent electric energy meter and is used as a part of hardware of the intelligent electric energy meter. The intelligent electric energy meter is provided with an electric energy quality monitoring function.
Because the power quality monitoring system provided by the invention is not provided with an independent data processing module, but calls a processor (MCU) in the electric energy meter to complete a data processing task in the realization function, the part of functions can be realized by a simpler hardware architecture matched with corresponding software. Based on the reason, in current intelligent ammeter, can carry out simple hardware improvement and software upgrading, integrate the relevant function module of power quality monitoring that this embodiment provided to the hardware of current ammeter. The intelligent electric energy meter for later-stage production and use is integrated with the corresponding functions of electric energy quality detection and power grid electric energy abnormity early warning.
In this embodiment, the safety precaution signal generated by the alarm unit is output to an alarm connected to the local end of the intelligent electric energy meter, so as to drive the alarm to work. When the alarm operates, operation and maintenance management personnel on site can find the specific position of the fault in time, and further the speed of fault handling is improved. Meanwhile, the alarm unit of the embodiment also outputs the generated safety early warning signal to a remote master station server. And after receiving the safety early warning information, the master station server analyzes the fault state of the power grid node corresponding to the electric energy meter according to the electric energy quality monitoring result and issues a corresponding operation and maintenance decision scheme to operation and maintenance management personnel.
After the system provided by the embodiment is applied, automatic statistical analysis can be performed on abnormal indexes at the intelligent electric energy meter node, the abnormal control of key indexes is realized, data support is provided for the electric energy quality, and the good running of a power grid is guaranteed. The system has high automation degree, does not need manual intervention in the monitoring process, and can reduce the workload of operation and maintenance personnel. Therefore, the method is very suitable for the distributed clean energy grid connection process, realizes real-time power quality monitoring, and reduces the impact of the grid connection process on a power grid.
As a further optimized solution of this embodiment, as shown in fig. 3, the power quality monitoring system further includes a data output interface, where the data output interface is used to connect to an external device, and further output a power grid power quality evaluation result of a current node generated by the system to the external device. The external device may be a display device, a printing device, or the like. The display device may display an electronic version of the relevant report or data; the printing device may print out a paper file of the relevant report or data.
Example 2
The embodiment provides a power quality monitoring method based on an intelligent electric energy meter, and the method is applied to the power quality monitoring system in the embodiment 1. As shown in fig. 4, the power quality monitoring method includes the following steps:
and the master station server transmits an electric energy quality monitoring instruction to the intelligent electric energy meters at each node in the power grid according to a preset index sampling frequency.
And after receiving the power quality monitoring instruction, the electric energy meter forwards the instruction to an instruction receiving unit in the power quality monitoring module. The instruction receiving unit verifies the instruction. And after the verification is passed, the instruction response unit calls a corresponding algorithm program stored in the storage module according to the electric energy meter quality monitoring index item requested to be uploaded and contained in the analyzed instruction. And writing the algorithm program into an RAM of a processor in the electric energy meter main control module.
A main control module in the electric energy meter executes a corresponding algorithm program in an RAM, and in the program execution process, the main control module firstly acquires electric power information acquired by a metering unit; then calculating or analyzing a corresponding power quality monitoring index item according to the power information; and finally, sending the calculated power quality monitoring result to a remote master station server and storing the power quality monitoring result in a storage module.
The alarm module acquires each updated power quality monitoring index in real time, and generates a corresponding safety early warning signal when any power quality monitoring index exceeds a preset safety threshold.
In this embodiment, in the execution process of the algorithm program, the main control module further stores the acquired power information acquired by the metering unit in the storage module, and performs data backup as basic data in the power quality analysis result.
When the master station server or operation and maintenance management personnel request the power quality monitoring system to download the power quality monitoring reports of any period, the main control module of the power meter inquires related data in the data storage unit in the storage module and generates the required power quality monitoring reports according to the power information in the corresponding period and the calculated power quality monitoring data.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents and improvements made within the spirit and principle of the present invention are intended to be included within the scope of the present invention.
Claims (10)
1. A power quality monitoring system based on an intelligent electric energy meter is characterized in that the system is installed in the intelligent electric energy meter and used for monitoring the power quality of a power grid of a current node and timely sending out early warning to a power grid control center when the power grid environment is abnormal; the electric energy meter quality monitoring system comprises:
the communication module is used for establishing communication connection between the local intelligent electric energy meter and a remote master station server;
the data acquisition unit is used for acquiring various real-time electric power information measured by the measuring unit in the intelligent electric energy meter;
a storage module including a program storage unit and a data storage unit; the program storage unit is used for storing an algorithm program used for analyzing and calculating various electric energy quality monitoring indexes, and the data storage unit is used for storing real-time electric power information acquired by the data acquisition unit and calculating the result of the electric energy quality monitoring indexes according to the real-time electric power information;
the command receiving unit is used for receiving an electric energy quality monitoring command which is issued by the master station server and forwarded by the master control module of the intelligent electric energy meter, and carrying out safety verification on the command through equipment identification code verification; the power quality monitoring instruction comprises one or more power quality monitoring indexes requested to be uploaded by the master station server and an equipment identification code of the intelligent electric energy meter for executing the instruction;
the instruction response unit is used for writing the corresponding algorithm program stored in the storage module into a processor RAM of a main control module of the intelligent electric energy meter according to the electric energy meter quality monitoring index item requested to be uploaded in the analyzed electric energy quality monitoring instruction after the electric energy quality monitoring instruction passes the verification; when the main control module executes the algorithm program, the main control module calls power information required by each power quality monitoring index item to the metering unit, then calculates and analyzes a result of a corresponding power quality monitoring index, and finally uploads the result to the main station server through the communication module and writes the result into a data storage unit of the storage module;
and the alarm unit is used for acquiring a real-time power quality monitoring result written in the storage module, comparing the monitoring result with a preset safety threshold value, and generating a corresponding safety early warning signal when any one real-time power quality monitoring result exceeds the safety threshold value.
2. The intelligent electric energy meter-based electric energy quality monitoring system according to claim 1, wherein: the electric energy quality monitoring system is electrically connected with a main control module of the intelligent electric energy meter through a URAT interface; the data acquisition unit is electrically connected with the metering unit of the intelligent electric energy meter through the SPI interface, and then required real-time electric power information is obtained.
3. The intelligent electric energy meter-based electric energy quality monitoring system according to claim 2, wherein: in the power quality monitoring system, the power information for analyzing the power quality includes: harmonic voltage, 2-50 times of current content, 2-50 times of harmonic current effective value, voltage total harmonic distortion, current total harmonic distortion, 2-50 times of harmonic phase angle, harmonic power, inter-harmonic voltage, 0.5-49.5 times of current content, 0.5-49.5 times of inter-harmonic current effective value.
4. The intelligent electric energy meter-based electric energy quality monitoring system according to claim 3, wherein: in the power quality monitoring system, the monitoring indexes of the power quality comprise a steady-state data index item and a transient-state data index item; wherein the steady-state data index term includes: voltage deviation, frequency deviation, three-phase voltage or three-phase current unbalance, voltage fluctuation, flicker, harmonic data and inter-harmonic data; the harmonic data comprises harmonic voltage or harmonic current content, harmonic current effective value, voltage total harmonic distortion rate, current total harmonic distortion rate, harmonic phase angle and harmonic power; the inter-harmonic data comprises inter-harmonic voltage or inter-harmonic current content and inter-harmonic current effective value; the transient data index item comprises event data and valid value data; the event data comprises voltage sag, voltage sag and short-time interruption; the effective value data refers to effective value data of a trigger record.
5. The intelligent electric energy meter-based electric energy quality monitoring system according to claim 4, wherein: the electric energy quality monitoring system is electrically connected with a communication interface reserved in the existing intelligent electric energy meter by adopting a detachable module scheme; in the installation state, the intelligent electric energy meter automatically configures the working state information of the corresponding module; the communication module in the power quality monitoring system adopts the existing functional module in the electric energy meter; the communication module adopts a functional module based on Ethernet, power carrier communication or digital mobile communication.
6. The intelligent electric energy meter-based electric energy quality monitoring system according to claim 4, wherein: the electric energy quality monitoring system is arranged in a main control module of the existing intelligent electric energy meter by adopting an integrated module scheme and is used as a part of the hardware of the intelligent electric energy meter; the intelligent electric energy meter is provided with an electric energy quality monitoring function.
7. The intelligent electric energy meter-based electric energy quality monitoring system according to claim 4, wherein: the safety early warning signal generated by the alarm unit is output to an alarm connected to the local end of the intelligent electric energy meter and used for driving the alarm to work; and the fault state of the power grid node corresponding to the electric energy meter is analyzed according to the electric energy quality monitoring result after the safety early warning information is received by the master station server, and a corresponding operation and maintenance decision scheme is issued to operation and maintenance management personnel.
8. The intelligent electric energy meter-based electric energy quality monitoring system according to claim 7, wherein: the power quality monitoring system also comprises a data output interface, wherein the data output interface is used for connecting external equipment, and further outputting a power grid power quality evaluation result of a current node generated by the system to the external equipment.
9. A power quality monitoring method based on an intelligent electric energy meter is characterized in that the method is applied to the power quality monitoring system according to any one of claims 1 to 8; the power quality monitoring method comprises the following processes:
the master station server sends an electric energy quality monitoring instruction to the intelligent electric energy meters at all nodes in the power grid according to a preset index sampling frequency;
after receiving the power quality monitoring instruction, the electric energy meter forwards the instruction to an instruction receiving unit in the power quality monitoring module, and the instruction receiving unit verifies the instruction; after the verification is passed, the instruction response unit calls a corresponding algorithm program stored in the storage module according to the electric energy meter quality monitoring index item requested to be uploaded and contained in the analyzed instruction; writing the algorithm program into an RAM of a processor in the electric energy meter main control module;
a main control module in the electric energy meter executes a corresponding algorithm program in an RAM, and in the program execution process, the main control module firstly acquires electric power information acquired by a metering unit; then calculating or analyzing a corresponding power quality monitoring index item according to the power information; finally, the calculated power quality monitoring result is sent to a remote master station server and stored in a storage module;
the alarm module acquires each updated power quality monitoring index in real time, and generates a corresponding safety early warning signal when any power quality monitoring index exceeds a preset safety threshold.
10. The intelligent electric energy meter-based electric energy quality monitoring method according to claim 9, wherein: in the execution process of the algorithm program, the main control module also stores the acquired electric power information acquired by the metering unit into the storage module, and the electric power information is used as basic data in the electric energy quality analysis result for data backup;
when the master station server or operation and maintenance management personnel request the power quality monitoring system to download the power quality monitoring reports of any period, the main control module of the power meter inquires related data in the data storage unit in the storage module and generates the required power quality monitoring reports according to the power information in the corresponding period and the calculated power quality monitoring data.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115170000A (en) * | 2022-09-06 | 2022-10-11 | 浙江万胜智能科技股份有限公司 | Remote monitoring method and system based on electric energy meter communication module |
| CN115629235A (en) * | 2022-10-25 | 2023-01-20 | 广西电网有限责任公司钦州供电局 | Power data monitoring system and method based on intelligent phase voltammeter |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115170000A (en) * | 2022-09-06 | 2022-10-11 | 浙江万胜智能科技股份有限公司 | Remote monitoring method and system based on electric energy meter communication module |
| CN115170000B (en) * | 2022-09-06 | 2023-01-13 | 浙江万胜智能科技股份有限公司 | Remote monitoring method and system based on electric energy meter communication module |
| CN115629235A (en) * | 2022-10-25 | 2023-01-20 | 广西电网有限责任公司钦州供电局 | Power data monitoring system and method based on intelligent phase voltammeter |
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