CN111122968A - Real-time metering and monitoring system and method for power data and power quality - Google Patents
Real-time metering and monitoring system and method for power data and power quality Download PDFInfo
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- CN111122968A CN111122968A CN202010038937.3A CN202010038937A CN111122968A CN 111122968 A CN111122968 A CN 111122968A CN 202010038937 A CN202010038937 A CN 202010038937A CN 111122968 A CN111122968 A CN 111122968A
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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
- G01R19/00—Arrangements for measuring currents or voltages or for indicating presence or sign thereof
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R21/00—Arrangements for measuring electric power or power factor
- G01R21/006—Measuring power factor
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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
- G01R23/00—Arrangements for measuring frequencies; Arrangements for analysing frequency spectra
- G01R23/02—Arrangements for measuring frequency, e.g. pulse repetition rate; Arrangements for measuring period of current or voltage
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R23/00—Arrangements for measuring frequencies; Arrangements for analysing frequency spectra
- G01R23/16—Spectrum analysis; Fourier analysis
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R25/00—Arrangements for measuring phase angle between a voltage and a current or between voltages or currents
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R29/00—Arrangements for measuring or indicating electric quantities not covered by groups G01R19/00 - G01R27/00
- G01R29/16—Measuring asymmetry of polyphase networks
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- General Physics & Mathematics (AREA)
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Mathematical Physics (AREA)
- Remote Monitoring And Control Of Power-Distribution Networks (AREA)
Abstract
The invention belongs to the technical field of electrical equipment, and discloses a system and a method for measuring and monitoring electric power data and electric energy quality in real time, wherein a display module is used for displaying relevant parameters and parameter change trends through characters and visual images; the communication module is used for providing a hot plug communication interface capable of being exchanged on site; the electric energy metering and checking module is used for metering and recording active power, reactive power, apparent electric energy, electric energy demand, voltage and current and other related instantaneous quantities; the parameter configuration module is used for configuring relevant parameters according to actual needs; the electric energy power grid quality monitoring module is used for monitoring the quality of an electric energy power grid; the input/output module is used for providing an input/output interface. The invention has high performance, low cost, high precision and long-term metering stability; the system can be used for charging and settlement, can be accessed to a three-phase four-wire or three-wire system power grid through a voltage and current transformer, has wide voltage range and can simultaneously measure the electric energy and the electric energy demand.
Description
Technical Field
The invention belongs to the technical field of electrical equipment, and particularly relates to a system and a method for measuring and monitoring electric power data and electric energy quality in real time.
Background
Currently, the closest prior art: the development of electric energy meters has been over a hundred years, and due to the requirements on high accuracy and sensitivity of electric energy metering and management diversity and flexibility, people develop and develop multifunctional electric energy meters. The method is used for metering and recording active, reactive, apparent electric energy, electric energy demand, voltage and current and other instantaneous quantities. The high-precision electronic multifunctional gateway electric energy meter is suitable for large and medium-sized industrial users and commercial users. From the late 60 s, electronic kilowatt-hour meters, also called static kilowatt-hour meters, were developed abroad. In comparison, for the same-grade meter, the electronic watt-hour meter has much better current linearity, voltage and frequency influence and smaller volume. The primary reason why the market demand for electronic watches is far less than that for mechanical watches is that they do not have the same product life at the same price. However, with the development of microelectronics, electronic watches have become technically mature. The industry analysis, along with the adjustment of the power utilization policy by the power department, the state gradually carries out the time-of-use electricity price policy, the traditional mechanical electric energy meter can not meet the requirement, and the replacement of the mechanical meter by an electronic meter is in great trend. The market demand of domestic civil electric meters is changing from taking mechanical electric energy meters as the main part to taking the electronic watch as the leading factor silently, and the concrete expression is from ordinary functional type ammeter to the electronic type electric energy meter direction transition of high-tech content and high added value such as long-life, time sharing, multi-functional.
In summary, the problems of the prior art are as follows: the existing watt-hour meter has incomplete functions, cannot realize the real-time monitoring of the quality of electric energy, and has poor quality, anti-interference capability and anti-attack capability.
Disclosure of Invention
Aiming at the problems in the prior art, the invention provides a system and a method for measuring and monitoring power data and power quality in real time.
The invention is realized in this way, a real-time measurement and monitoring system for power data and power quality, which specifically comprises:
a display module: the device is used for displaying related parameters and parameter variation trends through characters and visual images;
a communication module: the hot plug communication interface is used for providing a hot plug communication interface which can be disassembled and replaced on site; the module has the main functions of meeting the requirements of various communication modes, and replacing the communication interface module on site at any time according to the communication protocol requirements of different projects;
the electric energy measurement examination module: the device is used for metering and recording active power, reactive power, apparent electric energy, electric energy demand, voltage and current and other related instantaneous quantities; the module utilizes 3 current transformers with high-permeability iron cores and linear characteristics for compensation and three voltage dividers of precise resistors, the current transformers are compensated through electronic circuits and additional compensation coils, and the influence of nonlinear hysteresis characteristics can be eliminated;
a parameter configuration module: the system is used for configuring relevant parameters according to actual needs; in the parameter setting mode, parameter setting can be performed through the communication interface or through the key. When set through the communication interface, the key set is disabled. When the setting is carried out through the keys, the setting of the communication interface is invalid;
electric energy power grid quality monitoring module: the system comprises an electric energy quality parameter metering unit, an electric energy distribution online monitoring unit, an electric energy settlement unit and a harmonic wave monitoring unit; the monitoring system is used for monitoring the quality of the electric energy power grid; the module may monitor the amplitude of the 50 th harmonic, the distortion factor THD, TDD, and waveform quality metrics, such as the K factor and crest factor, for each voltage and current path. Power quality events such as voltage dips, surges, interruptions, etc. may be monitored. The instantaneous and effective values of the phase voltages, phase currents, frequencies, and the power factors and phase angles of the phases are monitored. Simultaneously, the unbalance of positive, negative and zero sequence measurement can be monitored;
an input/output module: for providing an input/output interface.
Further, the display module displays various complex data, information and events; the displayed data is identified by the OBIS code of IEC62056-61 standard; the display module has a plurality of display modes, including a system parameter initialization mode, a system setting mode, an automatic rolling mode, a manual rolling mode and the like. Displaying different data in each display mode; the display sequence programming settings may be determined in a system parameter initialization mode.
Further, the electric energy measurement examination module specifically comprises:
the electric energy metering and checking module can measure secondary input active electric energy, output active electric energy, four-quadrant reactive electric energy and combined quadrant reactive electric energy through single phase or three phase.
Further, the parameter configuration module specifically includes:
the parameter configuration module can configure the electric energy and the electric energy demand rate;
the time for switching the rates of the electric energy and the electric energy demand is determined by time and minutes, and the resolution can reach minutes;
the rate configuration includes two types:
(1) configuring a rate valid or a plurality of rates valid in each time period of each day, wherein the rate valid conditions of plan configuration of different daily rates can be different; a maximum of 8 different types of rates can be supported;
(2) the rate is selectively determined according to different seasons, besides the current rate plan, the rate plan can also be determined, and the activation can be carried out according to the date determined in advance;
the number of holidays of the rate configuration festival can be determined optionally.
In summary, the advantages and positive effects of the invention are: the invention has high performance, low cost, high precision and long-term metering stability; the system can be used for charging and settlement, can be accessed to a three-phase four-wire or three-wire system power grid through a voltage and current transformer, has wide voltage range and can simultaneously measure the electric energy and the electric energy demand.
The flexible communication module can be accessed into an AMR/AMI/SCADA system, and can be upgraded and used in a full-automatic substation system; bidirectional four-quadrant metering makes it suitable for power stations, substations and industrial and commercial users; the parallel communication interface can reduce the cost of the disk cabinet; the wide-range input voltage, current and auxiliary power supply voltage are suitable for various different places, and industrial standard DLMS and ModBUS communication protocols are supported; the electricity meter can read and display when power is off; the hot plug communication module capable of being replaced on site is provided; displays supporting multiple languages (english, swedish, german, french, spanish, italian, etc.); the precision level is up to 0.2S/0.5S; the wide-range alternating current-direct current double auxiliary power supply and the PT supply; the electric energy quality characteristics of THD, sudden drop, sudden rise, voltage unbalance, voltage loss and the like can be recorded; related data can be displayed through visual images such as vector diagrams, oscillograms and histograms, and remote configuration is supported; the battery is replaceable, and the power-off reading and displaying are supported; supporting IEC 61850; supporting RS232/RS485 and Ethernet interfaces; the electric energy and the instantaneous parameters can be stored independently; the time-of-use electricity price and the maximum demand are supported in a diversified way, and the open-close states of the watch case and the terminal cover can be monitored during summer; RS232 can be externally arranged with a Modem.
The invention supports various communication modules, is convenient for system integration, for example, supports RS232 and supplies power to the terminal Modem, and can be connected with the RS485 module and the Ethernet module in parallel. All modules of the invention support hot plug and can remotely configure addresses. The Ethernet can be provided with double ports, and the Modbus and the DLMS can be simultaneously connected with different clients. The communication port can simultaneously transmit at high speed.
Drawings
Fig. 1 is a schematic structural diagram of a real-time measurement and monitoring system for power data and power quality according to an embodiment of the present invention;
in the figure: 1. a display module; 2. a communication module; 3. an electric energy metering and checking module; 4. a parameter configuration module; 5. a power grid quality monitoring module; 6. an input/output module; 7. a power quality parameter metering unit; 8. an electric energy distribution online monitoring unit; 9. an electric energy settlement unit; 10. and a harmonic monitoring unit.
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 with reference to the following 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.
In view of the problems in the prior art, the present invention provides a system and a method for real-time measurement and monitoring of power data and power quality, which are described in detail below with reference to the accompanying drawings.
As shown in fig. 1, the system for real-time measurement and monitoring of power data and power quality provided by the embodiment of the present invention includes:
the display module 1: the method is used for displaying related parameters and parameter variation trends through characters and visual images. The module adopts a liquid crystal lattice display, and can clearly display various complex data, information and events. The data displayed are identified with the OBIS code of the IEC62056-61 standard. The module is provided with backlight illumination, so that the meter can be read easily when the light is not good. The display module has a plurality of display modes, including a system parameter initialization mode, a system setting mode, an automatic rolling mode, a manual rolling mode and the like. In each display mode, different data is displayed. The display sequence can be programmed and can be determined in the system parameter initialization mode.
And the communication module 2: the hot plug communication interface is used for providing a hot plug communication interface which can be exchanged in the field. The module covers various types of communication interfaces for field communication. And the system supports protocols such as IEC61850, RS232/RS485, Ethernet interface, Modbus and the like. The user can also arbitrarily combine the interfaces thereof according to the needs.
The electric energy measurement and assessment module 3: the device is used for metering and recording active power, reactive power, apparent electric energy, electric energy demand and voltage and current and other related instantaneous quantities. The types of electric energy that can be metered are: the active energy according to the IEC62053-22 standard (class 0.2S or 0.5S) and the reactive energy according to the IEC62053-23 standard (which may be calibrated to 0.2%). All the electric energy can be measured in single phase and three phases and is connected through a current transformer or a voltage transformer, and the displayed measured data is a secondary side value.
The parameter configuration module 4: for configuring relevant parameters according to actual needs.
Electric energy power grid quality monitoring module 5: the system comprises an electric energy quality parameter metering unit 7, an electric energy distribution online monitoring unit 8, an electric energy settlement unit 9 and a harmonic wave monitoring unit 10; the method is used for monitoring the quality of the electric energy power grid. The power grid quality parameters which can be monitored and displayed by the module comprise instantaneous values of phase voltage, phase current and frequency; a calculated value of neutral current and three-phase symmetry; effective values of phase voltage and phase current; power factor and phase angle of each phase; harmonic analysis; short power outages and voltage dips/spikes, etc. When a power grid quality event occurs, the monitoring module automatically records in a log book and carries a time mark and a parameter value.
Input/output module 6: for providing an input/output interface. The input is done with a semiconductor resistive type input that is electrically isolated from the system components. The output is implemented using programmable passive PHOTO-MOS relays. The input and output ports can be combined according to requirements, such as 6 input/8 output or 10 input/4 output.
The electric energy metering assessment module 3 provided by the embodiment of the invention specifically comprises:
the electric energy measurement and assessment module 3 can measure the side values of secondary input active electric energy, output active electric energy, four-quadrant reactive electric energy and combined quadrant reactive electric energy through single-phase or three-phase measurement.
The parameter configuration module 4 provided in the embodiment of the present invention specifically includes:
the parameter configuration module 4 may configure the electric energy and the electric energy demand rate.
The time for switching the rates of the electric energy and the electric energy demand is determined by time and minutes, and the resolution can reach to minutes.
The rate configuration includes two types:
(1) configuring a rate valid or a plurality of rates valid in each time period of each day, wherein the rate valid conditions of plan configuration of different daily rates can be different; up to 8 different types of rates can be supported.
(2) The rate is selectively determined according to different seasons, and besides the current rate plan, the rate plan can be determined and activated according to the determined date in advance.
The number of holidays of the rate configuration festival can be determined optionally.
The technical solution of the present invention is further illustrated by the following specific examples.
The embodiment of the invention provides the following measurement of the electric energy and the electric energy demand:
active (input/output) electric energy metering, according to IEC62053-22 standard, 0.2s or 0.5s
Reactive (four-quadrant, combined quadrant) electric energy metering, according with IEC62053-23 standard, 2-grade or 3-grade (which can be calibrated to 0.2%)
The bidirectional apparent power metering can be calibrated to 0.2%.
The embodiment of the invention provides power quality monitoring of a power grid, which comprises the following steps: phase voltage, phase current and frequency, harmonic analysis, total and three-phase power factor measurement, split-phase angle measurement, brief power interruption.
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 (7)
1. The utility model provides an electric power data and electric energy quality real-time measurement monitoring system which characterized in that, electric power data and electric energy quality real-time measurement monitoring system includes:
a display module: the device is used for displaying related parameters and parameter variation trends through characters and visual images;
a communication module: the hot plug communication interface is used for providing a hot plug communication interface which can be disassembled and replaced on site, meeting the requirements of various communication modes, and replacing the communication interface module on site at any time according to the communication protocol requirements of different projects;
the electric energy measurement examination module: the current transformer is used for metering and recording active power, reactive power, apparent electric energy, electric energy demand, voltage current and other related instantaneous quantities, 3 current transformers with high-permeability iron cores and linear characteristics for compensation and three voltage dividers of precise resistors are utilized, and the transformers are compensated through electronic circuits and additional compensation coils;
a parameter configuration module: the system is used for configuring relevant parameters according to actual needs; in the parameter setting mode, setting parameters through a communication interface or a key; when set through the communication interface, the key set is disabled. When the setting is carried out through the keys, the setting of the communication interface is invalid;
electric energy power grid quality monitoring module: the system comprises an electric energy quality parameter metering unit, an electric energy distribution online monitoring unit, an electric energy settlement unit and a harmonic wave monitoring unit; the monitoring system is used for monitoring the quality of the electric energy power grid;
an input/output module: for providing an input/output interface.
2. The system for real-time metering and monitoring of power data and power quality as claimed in claim 1, wherein the display module displays various complex data, information, events; the displayed data is identified by the OBIS code of IEC62056-61 standard; the display module has a plurality of display modes, including a system parameter initialization mode, a system setting mode, an automatic rolling mode, a manual rolling mode and the like; displaying different data in each display mode; the display sequence programming settings may be determined in a system parameter initialization mode.
3. The system for real-time measurement and monitoring of power data and power quality according to claim 1, wherein the power measurement assessment module comprises: the electric energy metering and checking module measures the secondary input active electric energy, the output active electric energy, the four-quadrant reactive electric energy and the combined quadrant reactive electric energy side value through single phase or three phase.
4. The system for real-time metering and monitoring of power data and power quality according to claim 1, wherein the parameter configuration module comprises:
the parameter configuration module is used for configuring electric energy and electric energy demand rates; the time for switching the rates of the electric energy and the electric energy demand is determined by time and minutes, and the resolution can reach minutes;
the rate configuration includes two types:
(1) configuring a rate valid or a plurality of rates valid in each time period of each day, wherein the rate valid conditions of plan configuration of different daily rates can be different; a maximum of 8 different types of rates can be supported;
(2) the rate is selectively determined according to different seasons, besides the current rate plan, the rate plan can also be determined, and the activation can be carried out according to the date determined in advance;
the number of holidays of the rate configuration festival can be determined optionally.
5. The real-time power data and power quality metering monitoring system of claim 1 wherein the power grid quality monitoring module is configured to monitor the amplitude, distortion factor THD, TDD and waveform quality indicators of the 50 th harmonic of each voltage and current channel; monitoring power quality events such as voltage collapse, sudden rise and interruption; monitoring instantaneous values and effective values of phase voltage, phase current and frequency, and power factors and phase angles of all phases; while the imbalance of positive, negative and zero sequence measurements can be monitored.
6. An information data processing terminal for realizing the electric power data and electric energy quality real-time metering monitoring system of any one of claims 1-5.
7. A computer-readable storage medium comprising instructions which, when executed on a computer, cause the computer to perform the power data and energy quality real-time metering monitoring system of any one of claims 1-5.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010038937.3A CN111122968A (en) | 2020-01-14 | 2020-01-14 | Real-time metering and monitoring system and method for power data and power quality |
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| CN202010038937.3A CN111122968A (en) | 2020-01-14 | 2020-01-14 | Real-time metering and monitoring system and method for power data and power quality |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113466680A (en) * | 2021-05-26 | 2021-10-01 | 中国电力科学研究院有限公司 | Self-calibration method and system of metering module pluggable and interchangeable circuit breaker |
| CN113552524A (en) * | 2021-06-17 | 2021-10-26 | 中国电力科学研究院有限公司 | Measurement module for supporting hot plug and automatic calibration method |
-
2020
- 2020-01-14 CN CN202010038937.3A patent/CN111122968A/en active Pending
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113466680A (en) * | 2021-05-26 | 2021-10-01 | 中国电力科学研究院有限公司 | Self-calibration method and system of metering module pluggable and interchangeable circuit breaker |
| CN113466680B (en) * | 2021-05-26 | 2023-12-08 | 中国电力科学研究院有限公司 | Self-calibration method and system for circuit breaker with pluggable metering module |
| CN113552524A (en) * | 2021-06-17 | 2021-10-26 | 中国电力科学研究院有限公司 | Measurement module for supporting hot plug and automatic calibration method |
| CN113552524B (en) * | 2021-06-17 | 2024-02-09 | 中国电力科学研究院有限公司 | Measurement module for supporting hot plug and automatic calibration method |
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