CN111861796A - Method for comprehensively evaluating electric energy quality of regional power distribution network - Google Patents
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Abstract
The invention discloses a method for comprehensively evaluating the power quality of a regional power distribution network, which comprises the following steps of firstly, erecting a power quality evaluation system of the power distribution network; step two, monitoring a regional electric meter; step three, comprehensively evaluating the power quality of the power grid; monitoring, evaluating, outputting and displaying; in the first step, intelligent electric meters are installed on input circuits of users of the power distribution network in one area, and a special area power distribution network power quality monitoring center is built; in the second step, after the power distribution network power quality evaluation system is erected, power is taken from a power grid through a PWM power management module in the intelligent electric meter of each user; according to the method, the basic parameters of the power quality such as voltage, current, frequency and the like on each node of the power grid can be collected and monitored, and then the data collected by each user is input into the power quality monitoring center of the power distribution network together for joint analysis and evaluation, so that the power quality of the power grid can be comprehensively and specifically known.
Description
Technical Field
The invention relates to the technical field of power quality evaluation of a power distribution network, in particular to a method for comprehensively evaluating the power quality of a regional power distribution network.
Background
Along with improvement of power supply reliability of users, safe and stable operation of a power distribution network is important; the power distribution network is complex in network frame, large in equipment number and wide in related range, and potential risks are often brought to the power distribution network, so that the method has important practical significance for evaluating the power quality of the power distribution network; according to the implementation of the modern power grid regional planning, in order to ensure that the regional power supply is performed well and stably, the power quality of a regional power distribution network is generally required to be comprehensively evaluated.
At present, the comprehensive evaluation of the power quality of a regional power distribution network is generally carried out on a plurality of typical days every year or every season, workers manually detect various parameters of the load characteristics of the power distribution network or test the parameters after finding problems, the traditional random power quality detection and evaluation of the power distribution network, a single-point random detection cannot obtain comprehensive power quality parameters, the final evaluation result is influenced, the power quality management is always in a passive status, and the comprehensive evaluation cannot adapt to the development requirements of an intelligent power distribution network; the electric meters are distributed and installed on each node of the regional power distribution network, and if the electric power quality parameters of the power grid can be acquired on each electric meter and analyzed and evaluated, the electric power quality of the power grid can be comprehensively and specifically known, so that the method for comprehensively evaluating the electric power quality of the regional power distribution network is significant on the basis.
Disclosure of Invention
The invention aims to provide a method for comprehensively evaluating the power quality of a regional power distribution network, so as to solve the problems in the background technology.
In order to solve the technical problems, the invention provides the following technical scheme: a method for comprehensively evaluating the power quality of a regional power distribution network comprises the following steps of firstly, erecting a power quality evaluation system of the power distribution network; step two, monitoring a regional electric meter; step three, comprehensively evaluating the power quality of the power grid; monitoring, evaluating, outputting and displaying;
in the first step, intelligent electric meters are installed on input circuits of users of the power distribution network in one area, and a special area power distribution network power quality monitoring center is built;
the intelligent ammeter comprises a current conversion module, a voltage sampling module, a frequency monitoring module, a PWM (pulse-width modulation) power supply management module, a data integration module and an ammeter index display module, wherein the current conversion module, the voltage sampling module and the frequency monitoring module are distributed and mounted on the inner wall of the top end of the intelligent ammeter, and the PWM power supply management module, the data integration module and the ammeter index display module are distributed and mounted on the inner wall of the bottom end of the intelligent ammeter;
the power distribution network power quality monitoring center comprises a power data acquisition module, a power grid power comprehensive evaluation module, a data server, a power quality evaluation grading module and a monitoring display output module, wherein the power data acquisition module, the power grid power comprehensive evaluation module, the data server, the power quality evaluation grading module and the monitoring display output module are distributed and installed in the power distribution network power quality monitoring center;
in the second step, after the power distribution network power quality evaluation system is erected, the power of a power grid is obtained through a PWM power supply management module in an intelligent ammeter of each user, the output of a power supply is managed and distributed, power supply of each regional protection is realized, the current of a power grid user is monitored through a current conversion module in the ammeter in the power supply process, the voltage of the power grid user is monitored through a voltage sampling module in the ammeter, the frequency of the power grid user is monitored through a frequency monitoring module in the ammeter, the integration and storage of the voltage, current and frequency data monitored by the ammeter are carried out through a data integration module, the integration and storage are used for later-stage reading of the data such as power consumption, and the data integrated by each user are transmitted to a power distribution network power quality monitoring center through a data transmission module;
in the third step, after the data transmission is integrated by each user, the data passes through a power quality monitoring center of the power distribution network; the method comprises the steps that monitoring data of each user in a power grid are comprehensively collected through an electric energy data collection module, the mean value of the comprehensive data of the power grid is comprehensively evaluated through a power grid comprehensive evaluation module, the frequency deviation of the power grid is evaluated through a frequency unit in the evaluation process, the current deviation of the power grid is evaluated through a current unit, the three-phase unbalance degree of the power grid, the voltage fluctuation, the voltage spectrum wave distortion degree, the voltage flicker, the voltage sag and the voltage deviation are evaluated through a voltage unit, and the power supply reliability of the power grid is evaluated through a power grid electric energy power supply reliability unit; then, the data and the standard value are compared, evaluated and rated by matching with an electric energy quality evaluation and rating module, and the power grid data are stored through a data server in the process;
in the fourth step, after the intelligent electric meter monitors the electric network in the second step, monitoring and displaying of various electric network data are carried out through the electric meter index display module, in the third step, after the power distribution network electric energy quality monitoring center evaluates and ranks, the electric network electric energy quality result is displayed and output through the monitoring and displaying output module, and the intelligent electric meter and the power distribution network electric energy quality monitoring center can carry out remote transmission through the data transmission module and carry out remote browsing and reading through the display terminal.
According to the technical scheme, the intelligent electric meter, the power distribution network electric energy quality monitoring center and the display terminal are internally provided with the data transmission modules.
According to the technical scheme, the data transmission module can be a mobile data transmission mode or a WiFi data transmission mode.
According to the technical scheme, the display terminal can be one or more of a computer, a mobile phone and a tablet computer.
According to the technical scheme, the Rogowski coil unit is installed inside the current conversion module, and the voltage transformer unit is installed inside the voltage sampling module.
According to the technical scheme, the intelligent electric meter is connected with the power distribution network power quality monitoring center in a grounding mode in the erection and installation process.
According to the technical scheme, the display screens are mounted on the outer walls of the intelligent electric meter and the power distribution network power quality monitoring center.
Compared with the prior art, the invention has the beneficial effects that:
(1) the intelligent electric meter can record daily power consumption, simultaneously collect and monitor basic parameters of electric energy quality such as voltage, current, frequency and the like on each node of the power grid, and then input data collected by each user into the power quality monitoring center of the power distribution network for joint analysis and evaluation, so that the electric energy quality of the power grid can be comprehensively and specifically known, and the evaluation precision is improved;
(2) the real-time online evaluation of the electric energy quality of the regional power distribution network can be realized, and the problems of labor waste, inconvenience and high result limitation of the traditional manual random detection evaluation are solved;
(3) the intelligent electric meter and the power distribution network electric energy quality monitoring center can transmit the result information of monitoring and analyzing in the whole process, and can remotely browse and read through the display terminal, so that the intelligent level is high.
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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 flow chart of the method of the present invention;
FIG. 2 is a schematic diagram of the overall structure of the power quality evaluation system of the power distribution network;
FIG. 3 is a schematic diagram of the modular component construction of the electricity meter and monitoring center of the present invention;
FIG. 4 is a flow chart of the power distribution network power quality evaluation system of the present invention;
in the figure: 1. a power distribution network; 2. a smart meter; 3. a power quality monitoring center of the power distribution network; 4. a display terminal; 5. a data transmission module; 21. a current conversion module; 22. a voltage sampling module; 23. a frequency monitoring module; 24. a PWM power management module; 25. a data integration module; 26. an ammeter index display module; 31. an electric energy data acquisition module; 32. a power grid electric energy comprehensive evaluation module; 33. a data server; 34. the electric energy quality evaluation grading module; 35. and a monitoring display output module.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Referring to fig. 1-4, the present invention provides a technical solution: a method for comprehensively evaluating the power quality of a regional power distribution network comprises the following steps of firstly, erecting a power quality evaluation system of the power distribution network; step two, monitoring a regional electric meter; step three, comprehensively evaluating the power quality of the power grid; monitoring, evaluating, outputting and displaying;
in the first step, an intelligent electric meter 2 is installed on an input circuit of each user of the power distribution network 1 in one area, and a special area power distribution network power quality monitoring center 3 is built;
the intelligent electric meter 2 comprises a current conversion module 21, a voltage sampling module 22, a frequency monitoring module 23, a PWM power supply management module 24, a data integration module 25 and an electric meter index display module 26, wherein the current conversion module 21, the voltage sampling module 22 and the frequency monitoring module 23 are distributed and installed on the inner wall of the top end of the intelligent electric meter 2, and the PWM power supply management module 24, the data integration module 25 and the electric meter index display module 26 are distributed and installed on the inner wall of the bottom end of the intelligent electric meter 2;
the power distribution network power quality monitoring center 3 comprises a power data acquisition module 31, a power grid power comprehensive evaluation module 32, a data server 33, a power quality evaluation grading module 34 and a monitoring display output module 35, the power data acquisition module 31, the power grid power comprehensive evaluation module 32, the data server 33, the power quality evaluation grading module 34 and the monitoring display output module 35 are distributed and installed in the power distribution network power quality monitoring center 3, a frequency unit, a current unit, a voltage unit and a power supply reliability unit are distributed and installed in the power quality evaluation grading module 34, and a display terminal 4 is arranged outside the power distribution network power quality monitoring center 3; data transmission modules 5 are arranged in the intelligent ammeter 2, the power distribution network power quality monitoring center 3 and the display terminal 4; the data transmission module 5 may be a mobile data transmission mode or a WiFi data transmission mode; the display terminal 4 can be one or more of a computer, a mobile phone and a tablet computer; a rogowski coil unit is installed inside the current conversion module 21, and a voltage transformer unit is installed inside the voltage sampling module 22; the intelligent electric meter 2 is connected with the power distribution network power quality monitoring center 3 in a grounding mode in the erection and installation process; the outer walls of the intelligent electric meter 2 and the power distribution network power quality monitoring center 3 are both provided with display screens;
in the second step, after the power distribution network power quality evaluation system is erected, the power supply of the power grid is carried out through the PWM power supply management module 24 in the intelligent electric meter 2 of each user, the output of the power supply is managed and distributed, the power supply of each regional protection is realized, the current of the power grid user is monitored through the current conversion module 21 in the electric meter in the power supply process, the voltage of the power grid user is monitored through the voltage sampling module 22 in the electric meter, the frequency of the power grid user is monitored through the frequency monitoring module 23 in the electric meter, the voltage, current and frequency data of the electric meter are integrated and stored through the data integration module 25, the voltage, current and frequency data are used for reading the later-stage data of the power consumption and the like, and the data integrated by each user are transmitted to the power distribution network power quality monitoring center 3 through the data transmission module 5;
in the third step, after the data transmission is integrated by each user, the user passes through a power quality monitoring center 3 of the power distribution network; the monitoring data of each user in the power grid are comprehensively acquired through the electric energy data acquisition module 31, the mean value of the comprehensive data of the power grid is comprehensively evaluated through the comprehensive electric energy evaluation module 32 of the power grid, the frequency deviation of the power grid is evaluated through the frequency unit in the evaluation process, the current deviation of the power grid is evaluated through the current unit, the three-phase unbalance degree of the power grid, the voltage fluctuation, the distortion degree of a voltage spectrum wave, the voltage flicker, the voltage sag and the voltage deviation are evaluated through the voltage unit, and the power supply reliability of the power grid is evaluated through the electric energy power supply reliability unit of the power grid; then, the data and the standard value are compared, evaluated and rated by matching with an electric energy quality evaluation and rating module 34, and the power grid data are stored through a data server 33 in the process;
in the fourth step, after the power grid of the intelligent electric meter 2 is monitored in the second step, monitoring and displaying of various power grid data are carried out through the electric meter index display module 26, in the third step, after the power distribution network power quality monitoring center 3 evaluates and ranks, the power grid power quality result is displayed and output through the monitoring and displaying output module 35, in addition, the intelligent electric meter 2 and the power distribution network power quality monitoring center 3 can carry out remote transmission through the data transmission module 5, and remote browsing and reading are carried out through the display terminal 4.
Compared with the related art, the method for comprehensively evaluating the electric energy quality of the regional power distribution network provided by the invention has the following beneficial effects: the intelligent electric meter 2 is installed and used on each user on a regional power distribution network, the electric meter can collect and monitor basic parameters of electric energy quality such as voltage, current, frequency and the like on each node of the power distribution network while recording daily power consumption, and then data collected by each user is input into the power distribution network electric energy quality monitoring center 3 together for joint analysis and evaluation, so that the electric energy quality of the power distribution network can be comprehensively and specifically known, the evaluation precision is improved, the real-time online evaluation can be realized, and the problems that the traditional manual random detection and evaluation is labor-consuming and inconvenient and has high result limitation are solved; wherein the result information of monitoring analysis on smart electric meter 2 and the distribution network power quality monitoring center 3 can carry out whole transmission to can carry out long-range browsing through display terminal and read, intelligent level is high.
It is noted that, herein, relational terms such as first and second, and the like may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus.
Finally, it should be noted that: although the present invention has been described in detail with reference to the foregoing embodiments, it will be apparent to those skilled in the art that changes may be made in the embodiments and/or equivalents thereof without departing from the spirit and scope of the invention. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (7)
1. A method for comprehensively evaluating the power quality of a regional power distribution network comprises the following steps of firstly, erecting a power quality evaluation system of the power distribution network; step two, monitoring a regional electric meter; step three, comprehensively evaluating the power quality of the power grid; monitoring, evaluating, outputting and displaying; the method is characterized in that:
in the first step, a smart electric meter (2) is installed on an input circuit of each user of the power distribution network (1) in one area, and a special area power distribution network power quality monitoring center (3) is built;
the intelligent electric meter (2) comprises a current conversion module (21), a voltage sampling module (22), a frequency monitoring module (23), a PWM power supply management module (24), a data integration module (25) and an electric meter index display module (26), wherein the current conversion module (21), the voltage sampling module (22) and the frequency monitoring module (23) are distributed and installed on the inner wall of the top end of the intelligent electric meter (2), and the PWM power supply management module (24), the data integration module (25) and the electric meter index display module (26) are distributed and installed on the inner wall of the bottom end of the intelligent electric meter (2);
the power distribution network power quality monitoring center (3) comprises a power data acquisition module (31), a power grid power comprehensive evaluation module (32), a data server (33), a power quality evaluation grading module (34) and a monitoring display output module (35), wherein the power data acquisition module (31), the power grid power comprehensive evaluation module (32), the data server (33), the power quality evaluation grading module (34) and the monitoring display output module (35) are distributed and installed in the power distribution network power quality monitoring center (3), a frequency unit, a current unit, a voltage unit and a power supply reliability unit are distributed and installed in the power quality evaluation grading module (34), and a display terminal (4) is arranged outside the power distribution network power quality monitoring center (3);
in the second step, after the power distribution network power quality evaluation system is erected, the power supply of the power grid is carried out through the PWM power supply management module (24) in the intelligent electric meter (2) of each user, and manages and distributes the output of the power supply to realize the power supply of each region, monitors the current of the power grid user through a current conversion module (21) in the ammeter in the power supply process, the voltage sampling module (22) in the electric meter is used for monitoring the voltage of the power grid user, the frequency monitoring module (23) in the electric meter is used for monitoring the frequency of the power grid user, the data integration module (25) is used for integrating and storing the voltage, current and frequency data monitored by the electric meter, the power distribution network power quality monitoring center is used for reading the power consumption data in the later period and transmitting the data integrated by each user to the power distribution network power quality monitoring center (3) through the data transmission module (5);
in the third step, after the data transmission is integrated by each user, the user passes through a power quality monitoring center (3) of the power distribution network; the method comprises the steps that monitoring data of each user in a power grid are comprehensively collected through an electric energy data collection module (31), the mean value of the comprehensive data of the power grid is comprehensively evaluated through an electric energy comprehensive evaluation module (32), the frequency deviation of the power grid is evaluated through a frequency unit in the evaluation process, the current deviation of the power grid is evaluated through a current unit, the three-phase unbalance degree of the power grid, the voltage fluctuation, the voltage spectrum wave distortion degree, the voltage flicker, the voltage sag and the voltage deviation are evaluated through a voltage unit, and the power supply reliability of the power grid is evaluated through an electric energy power supply reliability unit of the power grid; then, the data and the standard value are compared, evaluated and rated by matching with an electric energy quality evaluation and rating module (34), and the power grid data are stored through a data server (33) in the process;
in the fourth step, after the intelligent electric meter (2) monitors the power grid in the second step, monitoring and displaying of various power grid data are carried out through the electric meter index display module (26), in the third step, after the power distribution network power quality monitoring center (3) evaluates and ranks, the power grid power quality results are displayed and output through the monitoring and displaying output module (35), in addition, the intelligent electric meter (2) and the power distribution network power quality monitoring center (3) can carry out remote transmission through the data transmission module (5), and remote browsing and reading are carried out through the display terminal (4).
2. The method for comprehensively evaluating the power quality of the regional distribution network according to claim 1, wherein the method comprises the following steps: data transmission modules (5) are installed inside the intelligent electric meter (2), the power distribution network electric energy quality monitoring center (3) and the display terminal (4).
3. The method for comprehensively evaluating the power quality of the regional distribution network according to claim 2, wherein the method comprises the following steps: the data transmission module (5) can be in a mobile data transmission mode or a WiFi data transmission mode.
4. The method for comprehensively evaluating the power quality of the regional distribution network according to claim 1, wherein the method comprises the following steps: the display terminal (4) can be one or more of a computer, a mobile phone and a tablet computer.
5. The method for comprehensively evaluating the power quality of the regional distribution network according to claim 1, wherein the method comprises the following steps: the Rogowski coil unit is installed inside the current conversion module (21), and the voltage transformer unit is installed inside the voltage sampling module (22).
6. The method for comprehensively evaluating the power quality of the regional distribution network according to claim 1, wherein the method comprises the following steps: the intelligent electric meter (2) is connected with the power distribution network electric energy quality monitoring center (3) in a grounding mode in the erection and installation process.
7. The method for comprehensively evaluating the power quality of the regional distribution network according to claim 1, wherein the method comprises the following steps: and display screens are arranged on the outer walls of the intelligent electric meter (2) and the power distribution network electric energy quality monitoring center (3).
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| CN115222211A (en) * | 2022-06-21 | 2022-10-21 | 内蒙古电力(集团)有限责任公司内蒙古电力科学研究院分公司 | Electric power energy intelligent analysis management and control system based on internet of things technology |
| CN116413545A (en) * | 2023-06-09 | 2023-07-11 | 国网安徽省电力有限公司经济技术研究院 | Method and system for evaluating electric energy quality of direct-current distribution network |
| CN116413545B (en) * | 2023-06-09 | 2023-09-01 | 国网安徽省电力有限公司经济技术研究院 | Method and system for evaluating electric energy quality of direct-current distribution network |
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