CN116345701A - Low-voltage reactive compensation intelligent monitoring control system - Google Patents
Low-voltage reactive compensation intelligent monitoring control system Download PDFInfo
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J13/00—Circuit arrangements for providing remote indication of network conditions, e.g. an instantaneous record of the open or closed condition of each circuitbreaker in the network; Circuit arrangements for providing remote control of switching means in a power distribution network, e.g. switching in and out of current consumers by using a pulse code signal carried by the network
- H02J13/00002—Circuit arrangements for providing remote indication of network conditions, e.g. an instantaneous record of the open or closed condition of each circuitbreaker in the network; Circuit arrangements for providing remote control of switching means in a power distribution network, e.g. switching in and out of current consumers by using a pulse code signal carried by the network characterised by monitoring
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J13/00—Circuit arrangements for providing remote indication of network conditions, e.g. an instantaneous record of the open or closed condition of each circuitbreaker in the network; Circuit arrangements for providing remote control of switching means in a power distribution network, e.g. switching in and out of current consumers by using a pulse code signal carried by the network
- H02J13/00032—Systems characterised by the controlled or operated power network elements or equipment, the power network elements or equipment not otherwise provided for
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/18—Arrangements for adjusting, eliminating or compensating reactive power in networks
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E40/00—Technologies for an efficient electrical power generation, transmission or distribution
- Y02E40/30—Reactive power compensation
Abstract
The invention relates to the technical field of low-voltage reactive power compensation monitoring, in particular to an intelligent monitoring control system for low-voltage reactive power compensation. According to the invention, the electric parameters and the environmental parameters of each distribution line are analyzed, so that the reactive compensation influence coefficient of the line of the target low-voltage distribution network is evaluated, the reactive compensation effect of the distribution line is effectively analyzed, the accurate grasping and optimizing compensation effect in the later period is ensured, meanwhile, the operation power data of the low-voltage transformer is monitored, the reactive compensation influence coefficient of the transformer of the target low-voltage distribution network is evaluated, and accordingly, the power data change of the transformer can be timely compensated, the reactive compensation analysis can be flexibly and accurately carried out on the transformer, the demand compensation capacity of the target low-voltage distribution network is further analyzed, and reactive compensation adjustment treatment is carried out, so that the accuracy and timeliness of reactive compensation of the low-voltage distribution network are improved, and the distribution operation stability and reliability of the low-voltage distribution network are further improved.
Description
Technical Field
The invention relates to the technical field of low-voltage reactive power compensation monitoring, in particular to an intelligent monitoring control system for low-voltage reactive power compensation.
Background
With the continuous popularization and expansion of electric power applications, the load condition of an electric power network is continuously changed, especially in user side power distribution of a low-voltage power distribution network, because a large amount of electric power resources are needed, the problems of unbalanced electric power load, electric power loss and the like are easily caused. In addition, in the past period, due to the increase of the demand of users and the influence on the power, the power grid company has to continuously expand the output and the transmission capacity of the power, but the bottleneck problem of the low-voltage power distribution network still exists, and reactive power also causes pressure in the distribution transmission, so that the operation stability and the operation reliability of the low-voltage power distribution network are finally affected. Therefore, the application of low-voltage reactive compensation technology is becoming more and more important.
The existing low-voltage reactive compensation technology has the following defects when reactive compensation is performed on a low-voltage distribution network: 1. the real-time monitoring function of the electric parameters of the distribution line is lacking, important parameters such as voltage and current of the line are difficult to accurately know, the condition that fluctuation range of reactive compensation analysis results of the distribution line is large further occurs, reactive compensation effect analysis of the distribution line cannot be effectively performed, and compensation effects are further difficult to master and optimize.
2. The intelligent dynamic response capability is lacking, the line loss power of the distribution line cannot be automatically adjusted according to external environment influence factors, so that the reactive compensation analysis mode of the low-voltage distribution network at the later stage is relatively fixed and single, the reactive compensation requirement of the low-voltage distribution network cannot be effectively monitored, and the dynamic, efficient and intelligent reactive compensation effect cannot be further realized.
3. The prior art is difficult to compensate in time along with the change of input and output power data of the transformer, so that reactive compensation analysis cannot be flexibly and accurately performed on the transformer, the accuracy and timeliness of reactive compensation of a low-voltage distribution network in the later stage are further affected, and the distribution operation stability and reliability of the low-voltage distribution network are further reduced.
Disclosure of Invention
Aiming at the problems, the invention aims to provide a low-voltage reactive compensation intelligent monitoring control system, which solves the problems existing in the background technology.
The technical scheme adopted for solving the technical problems is as follows: the invention provides a low-voltage reactive compensation intelligent monitoring control system, which comprises: and the distribution line numbering module is used for taking lines between the low-voltage transformer corresponding to the target low-voltage distribution network and each power utilization user as each distribution line and sequentially numbering the distribution lines according to a set sequence.
And the distribution line operation monitoring module is used for carrying out electric monitoring and environment monitoring on each distribution line in a set time period to obtain electric parameters and environment parameters of each distribution line.
The circuit reactive compensation evaluation module is used for analyzing the electrical parameters and the environmental parameters of each distribution circuit by combining the lengths of the distribution circuits and evaluating the circuit reactive compensation influence coefficient of the target low-voltage distribution network
。
And the transformer operation monitoring module is used for monitoring the operation state of the low-voltage transformer corresponding to the target low-voltage distribution network in a set time period to obtain the operation power data of the low-voltage transformer.
The transformer reactive compensation evaluation module is used for analyzing the operation power data of the low-voltage transformer and evaluating the transformer reactive compensation influence coefficient of the target low-voltage distribution network
。
Reactive compensation state analysis module for analyzing reactive compensation state coincidence coefficient of target low-voltage distribution network
In the formula->
And if the target low-voltage distribution network does not accord with the reactive compensation state, acquiring the electric energy quality index of the target low-voltage distribution network for the set reactive compensation correction factor.
And the reactive compensation adjustment processing module is used for analyzing the required compensation capacity of the target low-voltage distribution network and further carrying out reactive compensation adjustment processing on the target low-voltage distribution network.
And the power grid database is used for storing basic information, rated reactive power and rated line loss power of each distribution line, storing proper environment temperature and proper environment humidity, copper wire standard resistance, standard volume and standard resistance of an iron core of the low-voltage distribution network corresponding to the distribution line, and storing standard compensation capacity corresponding to the low-voltage transformer, rated working efficiency, rated input power factor, rated output power factor and reactive compensation level.
Preferably, the electrical parameters include a current waveform and a voltage waveform, and the environmental parameters include an ambient temperature and an ambient humidity.
Preferably, the analyzing the electrical parameter and the environmental parameter of each distribution line specifically includes: substituting the current waveform diagram and the voltage waveform diagram of each distribution line into a set reference coordinate system, acquiring a current wave peak value and a voltage wave peak value of each unit period corresponding to each distribution line, analyzing a current fluctuation index and a voltage fluctuation index corresponding to each distribution line, further acquiring a current value and a voltage value of each distribution line, and recording the current value and the voltage value as
，/>
，/>
Numbering each distribution line, and screening the reference unit period corresponding to each distribution line according to the current value and the voltage value to obtain the time of the current peak point in the reference unit period corresponding to each distribution line +.>
And time of voltage peak point +.>
Analyzing to obtain reactive power of each distribution line>
，
In the formula->
Is the duration of the reference unit period.
Extracting basic information of each distribution line from a power grid database, wherein the basic information comprises service life and standard resistance of each unit length line, which are respectively recorded as
And obtaining the line loss power influence factor of each distribution line according to the ambient temperature and the ambient humidity of each distribution line>
The line loss power influence factor and length of each distribution line are added>
Substituting line loss power analytic formula +.>
Obtaining the line loss power of each distribution line>
。
Preferably, the line loss power influence factor of each distribution line is obtained by: the ambient temperature and the ambient humidity of each distribution line are respectively recorded as
And extracting the proper environment temperature of the distribution circuit corresponding to the low-voltage distribution network from the power grid database>
And a suitable ambient humidity->
Analyzing line loss power influence factors of distribution lines
In the formula->
Is natural constant (18)>
The set line loss power influence weight values of the distribution line corresponding to the service life, the ambient temperature and the ambient humidity are respectively +.>
。
Preferably, the analysis mode of the reactive compensation influence coefficient of the line of the target low-voltage power distribution network is as follows: extracting rated reactive power and rated line loss power of each distribution line from a power grid database, and respectively marking the rated reactive power and the rated line loss power as
And reactive power of each distribution line is +.>
And line loss power->
Reactive compensation influence coefficient analysis formula for substituted line
Obtaining a line reactive compensation influence coefficient of the target low-voltage distribution network>
In the formula->
Is natural constant (18)>
Reactive power of a preset distribution line and line loss power correspond to reactive compensation weight factors respectively.
Preferably, the analyzing the operation power data of the low-voltage transformer specifically includes: extracting current flowing through copper wire from operating power data of low-voltage transformer
And extracting the standard resistance of copper wires in the low-voltage transformer from the power grid database>
Analyzing to obtain copper loss power of the low-voltage transformer>
Wherein->
。
Extracting core flux density from operating power data of low voltage transformer
And extracting standard volume of the iron core in the low-voltage transformer from the power grid database>
And standard resistance->
Analyzing to obtain iron loss power of the low-voltage transformer>
，
In the formula->
For the proportionality coefficient at the set unit vector circle frequency, +.>
Is the Dragon index of the set iron core material.
Extracting input power from operating power data of a low voltage transformer
And output power->
Analyzing to obtain the working efficiency of the low-voltage transformer>
。
Preferably, the transformer reactive compensation influence coefficient evaluation formula of the target low-voltage power distribution network is as follows
，/>
Reactive compensation influence coefficient of transformer for target low-voltage distribution network, < ->
Respectively setting reactive compensation weight factors corresponding to the working efficiency and the power factor of the low-voltage transformer,
the low-voltage transformers stored in the power grid database are respectively corresponding to rated working efficiency, rated input power factor and rated output power factor, < >>
The input power factor and the output power factor are respectively in the operation power data of the low-voltage transformer.
Preferably, the power quality index obtaining mode of the target low-voltage power distribution network is as follows: monitoring instantaneous three-phase voltage, instantaneous input power and instantaneous output power of low-voltage transformer corresponding to target low-voltage distribution network, and analyzing electric energy quality index of target low-voltage distribution network
In the formula->
Is the instantaneous three-phase voltage of the low-voltage transformer, < >>
，/>
Instantaneous input power, instantaneous output power, for low-voltage transformer, < >>
Is the allowable error value of the preset input power and output power of the transformer.
Preferably, the demand compensation capacity analysis method of the target low-voltage distribution network is as follows: comparing the reactive compensation state coincidence coefficient of the target low-voltage distribution network with the reactive compensation state coincidence coefficient range corresponding to each preset reactive compensation level, screening the reactive compensation level of the target low-voltage distribution network, extracting the standard compensation capacity corresponding to each reactive compensation level of the low-voltage distribution network from a power grid database, screening to obtain the standard compensation capacity of the target low-voltage distribution network, and recording the standard compensation capacity as
Analyzing the demand compensation capacity of the target low-voltage distribution network>
Wherein->
，
Is the rated power quality index of the low-voltage distribution network.
Compared with the prior art, the invention has the following advantages and positive effects: (1) According to the invention, the electric monitoring is carried out on each distribution line in a set time period to obtain the electric parameters of each distribution line, so that the real-time monitoring function of the electric parameters of the distribution lines is realized, the important electric parameters of the lines can be accurately known, and the fluctuation range of the reactive compensation analysis result of the later distribution line is reduced.
(2) According to the invention, the line loss power influence factors of the distribution lines are obtained according to the environmental parameters of the distribution lines, and the line loss power of the distribution lines is analyzed by combining the basic information of the distribution lines, so that the intelligent dynamic response capability is realized, the flexibility of a reactive compensation analysis mode of a later-stage low-voltage distribution network is improved, the reactive compensation requirement of the low-voltage distribution network can be further effectively monitored, and the dynamic, efficient and intelligent reactive compensation effect is realized.
(3) According to the invention, the electric parameters and the environmental parameters of each distribution line are analyzed, and the line reactive compensation influence coefficient of the target low-voltage distribution network is estimated, so that the reactive compensation effect of the distribution line is effectively analyzed, and the accurate grasp and optimization of the compensation effect in the later period are ensured.
(4) According to the invention, the reactive compensation influence coefficient of the transformer of the target low-voltage power distribution network is evaluated by monitoring the operation power data of the low-voltage transformer, so that the transformer can be compensated in time along with the power data change of the transformer, and the reactive compensation analysis can be flexibly and accurately performed on the transformer.
(5) According to the reactive compensation method and the system, the reactive compensation state of the target low-voltage distribution network accords with the coefficient and the electric energy quality index, the demand compensation capacity of the target low-voltage distribution network is analyzed, reactive compensation adjustment processing is carried out, and therefore accuracy and timeliness of reactive compensation of the low-voltage distribution network can be improved, and distribution operation stability and reliability of the low-voltage distribution network are further improved.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings that are needed for the description of the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and that other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
FIG. 1 is a diagram illustrating a system module connection according to the present invention.
Fig. 2 is a schematic diagram of a current waveform diagram and a voltage waveform diagram of a distribution line in a set reference frame.
Reference numerals: 1. current waveform diagram, 2, voltage waveform diagram, 3, reference time of current peak point in unit period
4, time of voltage peak point in reference unit period +.>
。
Detailed Description
The following description of the embodiments of the present invention will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present invention, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
Referring to fig. 1, the invention provides a low-voltage reactive compensation intelligent monitoring control system, which comprises a distribution line numbering module, a distribution line operation monitoring module, a line reactive compensation evaluation module, a transformer operation monitoring module, a transformer reactive compensation evaluation module, a reactive compensation state analysis module, a reactive compensation adjustment processing module and a power grid database. The distribution line numbering module is respectively connected with the distribution line operation monitoring module and the transformer operation monitoring module, the line reactive compensation evaluation module is respectively connected with the distribution line operation monitoring module, the reactive compensation state analysis module and the power grid database, the transformer reactive compensation evaluation module is respectively connected with the transformer operation monitoring module, the reactive compensation state analysis module and the power grid database, and the reactive compensation state analysis module is respectively connected with the power grid database and the reactive compensation adjustment processing module.
And the distribution line numbering module is used for taking lines between the low-voltage transformer corresponding to the target low-voltage distribution network and each power utilization user as each distribution line and sequentially numbering the distribution lines according to a set sequence.
And the distribution line operation monitoring module is used for carrying out electric monitoring and environment monitoring on each distribution line in a set time period to obtain electric parameters and environment parameters of each distribution line. Wherein the electrical parameters include a current waveform and a voltage waveform, and the environmental parameters include an ambient temperature and an ambient humidity.
As a specific embodiment of the invention, the digital multimeter is used for electrically monitoring each distribution line in a set time period to obtain a current waveform diagram and a voltage waveform diagram of each distribution line.
The environment monitoring is carried out on each monitoring point arranged in each distribution line in a set time period through the temperature and humidity sensor, the environment temperature and the environment humidity of each monitoring point in each distribution line in each time point in the set time period are obtained, the environment temperature of each monitoring point in each distribution line in each time point in the set time period is compared with each other, the highest environment temperature in each distribution line is screened as the environment temperature of the corresponding distribution line, and the environment humidity of each distribution line is obtained through similar screening.
The invention monitors each distribution line electrically in a set time period to obtain the electrical parameters of each distribution line, thereby realizing the function of monitoring the electrical parameters of the distribution line in real time, ensuring that important electrical parameters of the line can be accurately known, and reducing the fluctuation range of reactive compensation analysis results of the distribution line in the later period.
The circuit reactive compensation evaluation module is used for analyzing the electrical parameters and the environmental parameters of each distribution circuit by combining the lengths of the distribution circuits and evaluating the circuit reactive compensation influence coefficient of the target low-voltage distribution network
。
Referring to fig. 2, in a preferred embodiment of the present invention, the analyzing the electrical parameters and the environmental parameters of each distribution line specifically includes: substituting the current waveform diagram and the voltage waveform diagram of each distribution line into a set reference coordinate system to obtainAnalyzing the current fluctuation index and the voltage fluctuation index corresponding to each distribution line to obtain the current value and the voltage value of each distribution line, and recording the current value and the voltage value as
，
，/>
Numbering each distribution line, and screening the reference unit period corresponding to each distribution line according to the current value and the voltage value to obtain the time of the current peak point in the reference unit period corresponding to each distribution line +.>
And time of voltage peak point +.>
Analyzing to obtain reactive power of each distribution line>
，/>
Where is the duration of the reference unit period.
The current value and the voltage value of each distribution line are obtained by the following steps: the peak value of the current and the peak value of the voltage corresponding to each unit period of each distribution line are recorded as
，/>
，/>
For the number of each unit period, analyzing the current fluctuation index corresponding to each distribution line>
And if the current fluctuation index corresponding to a certain distribution line is smaller than or equal to the set current fluctuation index threshold, taking the average current fluctuation value corresponding to the distribution line as the current value of the distribution line, and if the current fluctuation index corresponding to the certain distribution line is larger than the set current fluctuation index threshold, screening the current fluctuation value mode corresponding to the distribution line, taking the current fluctuation value mode as the current value of the distribution line, further counting the current value of each distribution line, and similarly screening and counting the voltage value of each distribution line. Because the low-voltage distribution network corresponds to the condition that the distribution line has current fluctuation or voltage fluctuation in the distribution process, the current waveform diagram part of the distribution line is distorted or the voltage waveform diagram part of the distribution line is distorted, and therefore the current fluctuation index or the voltage fluctuation index of the distribution line needs to be analyzed, the current value error or the voltage value error caused by the current fluctuation or the voltage fluctuation can be reduced, and the electrical data monitoring accuracy and the electrical data monitoring effectiveness of the distribution line are further improved.
It should be explained that when the current peak value of a certain distribution line corresponding to a certain unit period is the corresponding current value and the voltage peak value is the corresponding voltage value, the unit period corresponding to the distribution line is taken as the corresponding reference unit period.
Extracting basic information of each distribution line from a power grid database, wherein the basic information comprises service life and standard resistance of each unit length line, and recording the standard resistance
And obtaining the line loss power influence factor of each distribution line according to the ambient temperature and the ambient humidity of each distribution line>
The line loss power influence factor and length of each distribution line are added>
Substituting line loss power analytic formula +.>
Obtaining the line loss power of each distribution line>
。
In a preferred embodiment of the present invention, the line loss power influence factor of each distribution line is obtained by: the ambient temperature and the ambient humidity of each distribution line are respectively recorded as
And extracting the proper environment temperature of the distribution circuit corresponding to the low-voltage distribution network from the power grid database>
And a suitable ambient humidity->
Analyzing the line loss power influence factor +.>
In the formula->
Is natural constant (18)>
Respectively set line loss power influence weight values of the distribution line corresponding to service life, ambient temperature and ambient humidity,
。
the invention obtains the line loss power influence factors of the distribution lines according to the environmental parameters of the distribution lines, and analyzes the line loss power of the distribution lines by combining the basic information of the distribution lines, thereby realizing intelligent dynamic response capability, improving the flexibility of a reactive compensation analysis mode of the low-voltage distribution network at the later stage, further effectively monitoring the reactive compensation requirement of the low-voltage distribution network and realizing dynamic, efficient and intelligent reactive compensation effect.
Further, provided thatThe analysis mode of the reactive compensation influence coefficient of the line of the target low-voltage distribution network is as follows: extracting rated reactive power and rated line loss power of each distribution line from a power grid database, and respectively marking the rated reactive power and the rated line loss power as
And reactive power of each distribution line is +.>
And line loss power->
Reactive compensation influence coefficient analysis formula for substituted line
Obtaining a line reactive compensation influence coefficient of the target low-voltage distribution network>
In the formula->
Is natural constant (18)>
Reactive power of a preset distribution line and line loss power correspond to reactive compensation weight factors respectively.
The method and the system analyze the electrical parameters and the environmental parameters of each distribution line and evaluate the line reactive compensation influence coefficient of the target low-voltage distribution network, so that the reactive compensation effect of the distribution line is effectively analyzed, and the accurate grasping and optimizing of the compensation effect in the later period is ensured.
The transformer operation monitoring module is used for monitoring the operation state of the low-voltage transformer corresponding to the target low-voltage distribution network in a set time period to obtain the operation power data of the low-voltage transformer. Wherein the operating power data of the low voltage transformer includes input power, output power, input power factor, output power factor, current through the copper wire, and core flux density.
The input power and the output power of the low-voltage transformer are monitored through power sensors arranged at the input end and the output end of the low-voltage transformer respectively, the input power factor and the output power factor of the low-voltage transformer are monitored through power factor tables arranged at the input end and the output end of the low-voltage transformer respectively, the current flowing through copper wires of the low-voltage transformer is monitored through a current sensor connected in series with the copper wires corresponding to the low-voltage transformer, and the magnetic flux density of an iron core of the low-voltage transformer is monitored through a magnetic flux performance tester arranged at the periphery of the corresponding iron core of the low-voltage transformer.
The power sensor monitors the input power and the output power of the low-voltage transformer at each time point in a set time period, the input power and the output power of the low-voltage transformer are obtained after average calculation, and the input power factor, the output power factor, the current flowing through a copper wire and the magnetic flux density of the iron core of the low-voltage transformer are obtained in the same way.
The transformer reactive compensation evaluation module is used for analyzing the operation power data of the low-voltage transformer and evaluating the transformer reactive compensation influence coefficient of the target low-voltage distribution network
。
In a preferred embodiment of the present invention, the analyzing the operation power data of the low voltage transformer specifically includes: extracting current flowing through copper wire from operating power data of low-voltage transformer
And extracting the standard resistance of copper wires in the low-voltage transformer from the power grid database>
Analyzing to obtain copper loss power of the low-voltage transformer>
Wherein->
。
Extracting core flux density from operating power data of low voltage transformer
And extracting standard volume of the iron core in the low-voltage transformer from the power grid database>
And standard resistance->
Analyzing to obtain iron loss power of the low-voltage transformer>
，
In the formula->
For the proportionality coefficient at the set unit vector circle frequency, +.>
Is the Dragon index of the set iron core material.
Extracting input power from operating power data of a low voltage transformer
And output power->
Analyzing to obtain the working efficiency of the low-voltage transformer>
。
Further, the transformer reactive compensation influence coefficient evaluation formula of the target low-voltage power distribution network is as follows
，/>
Target low-voltage power distribution networkReactive compensation influence coefficient of the transformer, +.>
Respectively setting reactive compensation weight factors corresponding to the working efficiency and the power factor of the low-voltage transformer,
the low-voltage transformers stored in the power grid database are respectively corresponding to rated working efficiency, rated input power factor and rated output power factor, < >>
The input power factor and the output power factor are respectively in the operation power data of the low-voltage transformer.
By monitoring the operation power data of the low-voltage transformer, the method and the device evaluate the reactive compensation influence coefficient of the transformer of the target low-voltage power distribution network, so that the transformer can be compensated in time along with the power data change of the transformer, and reactive compensation analysis can be flexibly and accurately carried out on the transformer.
The reactive compensation state analysis module is used for analyzing reactive compensation state coincidence coefficients of the target low-voltage distribution network
In the formula->
And if the target low-voltage distribution network does not accord with the reactive compensation state, acquiring the electric energy quality index of the target low-voltage distribution network for the set reactive compensation correction factor.
In a specific embodiment, the power quality index obtaining manner of the target low-voltage power distribution network is as follows: monitoring instantaneous three-phase voltage, instantaneous input power and instantaneous output power of low-voltage transformer corresponding to target low-voltage distribution network, and analyzing electric energy quality index of target low-voltage distribution network
In the formula->
Is the instantaneous three-phase voltage of the low-voltage transformer, < >>
，/>
Instantaneous input power, instantaneous output power, for low-voltage transformer, < >>
Is the allowable error value of the preset input power and output power of the transformer.
It should be explained that the voltmeter monitors the instantaneous three-phase voltage of the low-voltage power distribution network corresponding to the low-voltage transformer.
The reactive compensation adjustment processing module is used for analyzing the demand compensation capacity of the target low-voltage distribution network and further carrying out reactive compensation adjustment processing on the target low-voltage distribution network according to the demand compensation capacity of the target low-voltage distribution network.
In a preferred embodiment of the present invention, the demand compensation capacity analysis method of the target low-voltage power distribution network is as follows: comparing the reactive compensation state coincidence coefficient of the target low-voltage distribution network with the reactive compensation state coincidence coefficient range corresponding to each preset reactive compensation level, screening the reactive compensation level of the target low-voltage distribution network, extracting the standard compensation capacity corresponding to each reactive compensation level of the low-voltage distribution network from a power grid database, screening to obtain the standard compensation capacity of the target low-voltage distribution network, and recording the standard compensation capacity as
Analyzing the demand compensation capacity of the target low-voltage distribution network>
Wherein
，/>
Is the rated power quality index of the low-voltage distribution network.
The reactive compensation method and the system have the advantages that the reactive compensation state of the target low-voltage distribution network accords with the coefficient and the electric energy quality index, the demand compensation capacity of the target low-voltage distribution network is analyzed, reactive compensation adjustment is carried out, and therefore the accuracy and timeliness of reactive compensation of the low-voltage distribution network can be improved, and the distribution running stability and reliability of the low-voltage distribution network are further improved.
The power grid database is used for storing basic information, rated reactive power and rated line loss power of each distribution line, storing proper environment temperature and proper environment humidity, copper wire standard resistance, standard volume and standard resistance of an iron core of the distribution line corresponding to the low-voltage distribution network, and storing standard compensation capacity corresponding to rated working efficiency, rated input power factor, rated output power factor and reactive compensation levels of the low-voltage transformer.
The foregoing is merely illustrative and explanatory of the principles of this invention, as various modifications and additions may be made to the specific embodiments described, or similar arrangements may be substituted by those skilled in the art, without departing from the principles of this invention or beyond the scope of this invention as defined in the claims.
Claims (9)
1. The utility model provides a low pressure reactive compensation intelligent monitoring control system which characterized in that includes:
the distribution line numbering module is used for taking lines between the low-voltage transformer corresponding to the target low-voltage distribution network and each power utilization user as each distribution line and sequentially numbering the distribution lines according to a set sequence;
the distribution line operation monitoring module is used for carrying out electric monitoring and environment monitoring on each distribution line in a set time period to obtain electric parameters and environment parameters of each distribution line;
the circuit reactive compensation evaluation module is used for analyzing the electrical parameters and the environmental parameters of each distribution circuit by combining the lengths of the distribution circuits and evaluating the circuit reactive compensation influence coefficient of the target low-voltage distribution network
；
The transformer operation monitoring module is used for monitoring the operation state of the low-voltage transformer corresponding to the target low-voltage distribution network in a set time period to obtain operation power data of the low-voltage transformer;
the transformer reactive compensation evaluation module is used for analyzing the operation power data of the low-voltage transformer and evaluating the transformer reactive compensation influence coefficient of the target low-voltage distribution network
；
Reactive compensation state analysis module for analyzing reactive compensation state coincidence coefficient of target low-voltage distribution network
In the formula->
For the set reactive compensation correction factor, if the target low-voltage distribution network does not accord with the reactive compensation state, acquiring the electric energy quality index of the target low-voltage distribution network;
the reactive compensation adjustment processing module is used for analyzing the required compensation capacity of the target low-voltage distribution network and further carrying out reactive compensation adjustment processing on the target low-voltage distribution network;
and the power grid database is used for storing basic information, rated reactive power and rated line loss power of each distribution line, storing proper environment temperature and proper environment humidity, copper wire standard resistance, standard volume and standard resistance of an iron core of the low-voltage distribution network corresponding to the distribution line, and storing standard compensation capacity corresponding to the low-voltage transformer, rated working efficiency, rated input power factor, rated output power factor and reactive compensation level.
2. The intelligent monitoring control system for low-voltage reactive compensation according to claim 1, wherein: the electrical parameters include a current waveform diagram and a voltage waveform diagram, and the environmental parameters include an environmental temperature and an environmental humidity.
3. The intelligent monitoring control system for low-voltage reactive compensation according to claim 2, wherein: analyzing the electrical parameters and the environmental parameters of each distribution line, specifically comprising:
substituting the current waveform diagram and the voltage waveform diagram of each distribution line into a set reference coordinate system, acquiring a current wave peak value and a voltage wave peak value of each unit period corresponding to each distribution line, analyzing a current fluctuation index and a voltage fluctuation index corresponding to each distribution line, further acquiring a current value and a voltage value of each distribution line, and recording the current value and the voltage value as
，/>
，/>
Numbering each distribution line, and screening the reference unit period corresponding to each distribution line according to the current value and the voltage value to obtain the time of the current peak point in the reference unit period corresponding to each distribution line +.>
And time of voltage peak point +.>
Analyzing to obtain reactive power of each distribution line>
，/>
In the formula->
Is the duration of the reference unit period;
extracting basic information of each distribution line from a power grid database, wherein the basic information comprises service life and standard resistance of each unit length line, which are respectively recorded as
And obtaining the line loss power influence factor of each distribution line according to the ambient temperature and the ambient humidity of each distribution line>
The line loss power influence factor and length of each distribution line are added>
Substituting line loss power analytic formula +.>
Obtaining the line loss power of each distribution line>
。
4. A low voltage reactive compensation intelligent monitoring control system according to claim 3, characterized in that: the line loss power influence factor obtaining mode of each distribution line is as follows:
the ambient temperature and the ambient humidity of each distribution line are respectively recorded as
And extracting the proper environment temperature of the distribution circuit corresponding to the low-voltage distribution network from the power grid database>
And a suitable ambient humidity->
Analyzing the line loss power influence factor +.>
In the formula->
Is a natural constant which is used for the production of the high-temperature-resistant ceramic material,
the set line loss power influence weight values of the distribution line corresponding to the service life, the ambient temperature and the ambient humidity are respectively +.>
。
5. A low voltage reactive compensation intelligent monitoring control system according to claim 3, characterized in that: the analysis mode of the reactive compensation influence coefficient of the line of the target low-voltage distribution network is as follows:
extracting rated reactive power and rated line loss power of each distribution line from a power grid database, and respectively marking the rated reactive power and the rated line loss power as
And reactive power of each distribution line is +.>
And line loss power->
Substituting line reactive compensation influence coefficient analysis formula +.>
Obtaining a line reactive compensation influence coefficient of the target low-voltage distribution network>
In the formula->
Is natural constant (18)>
Reactive power of a preset distribution line and line loss power correspond to reactive compensation weight factors respectively.
6. The intelligent monitoring control system for low-voltage reactive compensation according to claim 1, wherein: the analyzing the operation power data of the low-voltage transformer specifically comprises the following steps:
extracting current flowing through copper wire from operating power data of low-voltage transformer
And extracting the standard resistance of copper wires in the low-voltage transformer from the power grid database>
Analyzing to obtain copper loss power of the low-voltage transformer>
Wherein->
；
Extracting core flux density from operating power data of low voltage transformer
And extracting standard volume of the iron core in the low-voltage transformer from the power grid database>
And standard resistance->
Analyzing to obtain iron loss power of the low-voltage transformer>
，
In the formula->
For the proportionality coefficient at the set unit vector circle frequency, +.>
A Dragon index for the set iron core material;
extracting input power from operating power data of a low voltage transformer
And output power->
Analyzing to obtain the working efficiency of the low-voltage transformer>
。
7. The intelligent monitoring control system for low-voltage reactive compensation according to claim 6, wherein: the transformer reactive compensation influence coefficient evaluation formula of the target low-voltage distribution network is as follows
，
Reactive compensation influence coefficient of transformer for target low-voltage distribution network, < ->
Respectively setting reactive compensation weight factors corresponding to the working efficiency and the power factor of the low-voltage transformer, +.>
The low-voltage transformers stored in the power grid database are respectively corresponding to rated working efficiency and ratedInput power factor, rated output power factor, +.>
The input power factor and the output power factor are respectively in the operation power data of the low-voltage transformer.
8. The intelligent monitoring control system for low-voltage reactive compensation according to claim 7, wherein: the electric energy quality index acquisition mode of the target low-voltage distribution network is as follows:
monitoring instantaneous three-phase voltage, instantaneous input power and instantaneous output power of low-voltage transformer corresponding to target low-voltage distribution network, and analyzing electric energy quality index of target low-voltage distribution network
In the formula->
Is the instantaneous three-phase voltage of the low-voltage transformer, < >>
，/>
Instantaneous input power, instantaneous output power, for low-voltage transformer, < >>
Is the allowable error value of the preset input power and output power of the transformer.
9. The intelligent monitoring control system for low-voltage reactive compensation according to claim 8, wherein: the demand compensation capacity analysis mode of the target low-voltage distribution network is as follows:
comparing the reactive compensation state coincidence coefficient of the target low-voltage distribution network with the reactive compensation state coincidence coefficient range corresponding to each preset reactive compensation level, and screening the target low-voltage distribution networkReactive compensation levels, extracting standard compensation capacity corresponding to each reactive compensation level of the low-voltage distribution network from a power grid database, screening to obtain standard compensation capacity of a target low-voltage distribution network, and recording the standard compensation capacity as
Analyzing the demand compensation capacity of the target low-voltage distribution network>
Wherein
，/>
Is the rated power quality index of the low-voltage distribution network.
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