CN116413545B - Method and system for evaluating electric energy quality of direct-current distribution network - Google Patents
Method and system for evaluating electric energy quality of direct-current distribution network Download PDFInfo
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Abstract
The invention relates to the technical field of power distribution networks, and particularly discloses a method and a system for evaluating the power quality of a direct-current power distribution network, wherein the method comprises the following steps: s1, dividing a regional distribution network line, S2, detecting the regional distribution network line, S3, analyzing the regional distribution network line, S4, detecting a regional distribution network line terminal, S5, analyzing the regional distribution network line terminal, S6, comprehensively analyzing the power quality of the regional distribution network line, S7 and processing the terminal.
Description
Technical Field
The invention relates to the technical field of power distribution networks, in particular to a method and a system for evaluating the power quality of a direct-current power distribution network.
Background
The direct current power distribution network is an emerging distributed energy network, has the advantages of high efficiency, safety, reliability and the like, is an important component of a future energy distributed supply system, is widely applied, wherein the application of the power distribution network is wider in a public area illumination level, however, a series of electric energy quality problems exist in the application of the power distribution network in the illumination level, if the electric energy evaluation of the power distribution network in the illumination level is inaccurate, the normal operation of equipment is influenced, the service life of the equipment is reduced, the operation cost is increased and the like on one hand, the normal operation of power distribution network power utilization terminals is influenced on the other hand, the service efficiency of the power distribution network is reduced, and therefore, certain loss and unnecessary maintenance cost are brought to a power distribution company.
The power quality evaluation of the power distribution network in the prior art can meet the current requirements to a certain extent, but has certain defects, and the power quality evaluation is specifically implemented in the following layers: (1) In the prior art, the coincidence of the current and the voltage of a power distribution network line is mostly analyzed, the attention to the current deviation of the line to which the power distribution network belongs is not high, the length of the power distribution line influences the current deviation of the power distribution line to a certain extent, the result of the power quality evaluation of the power distribution network line at the current and voltage level is inaccurate due to the neglect of the power distribution line in the prior art, and further powerful data support cannot be provided for the power quality analysis of the subsequent power distribution network line, so that the safety and the reliability of the power distribution network are difficult to guarantee.
(2) The analysis strength of the power distribution network to the applied electric terminals is not deep enough in the prior art, the brightness and the control state of the electric terminals are factors for the electric energy evaluation of the electric terminals, the electric energy evaluation quality of the electric terminals reflects the electric evaluation quality of the power distribution network to a certain extent, the validity of the electric terminal quality evaluation is difficult to ensure due to the neglect of the prior art, the reference value of the power distribution network quality evaluation is further reduced, and the related maintenance work of the related staff of the subsequent power distribution network is not facilitated.
Disclosure of Invention
In order to overcome the defects in the background technology, the embodiment of the invention provides a method and a system for evaluating the electric energy quality of a direct current power distribution network, which can effectively solve the problems related to the background technology.
The aim of the invention can be achieved by the following technical scheme: the invention provides a method for evaluating the electric energy quality of a direct current power distribution network, which comprises the following steps: s1, dividing a regional power distribution network line: obtaining each line of the regional power distribution network, dividing each line of the regional power distribution network according to a preset length interval, marking the divided lines as a plurality of sub-lines, and obtaining a plurality of sub-lines corresponding to each line of the regional power distribution network.
S2, detecting a regional power distribution network line: and detecting the current and the voltage of a plurality of sub-circuits corresponding to each circuit to which the regional power distribution network belongs, and further acquiring the power utilization information corresponding to each circuit to which the regional power distribution network belongs in a set detection period.
S3, analyzing the regional distribution network lines: analyzing each line of the regional power distribution network at each detection time according to the power consumption information corresponding to each line of the regional power distribution network at the set detection periodPoint-to-point power quality assessment index。
S4, detecting a regional power distribution network line terminal: and detecting all the power utilization terminals corresponding to the regional power distribution network, and further acquiring images corresponding to all detection time points of the power utilization terminals corresponding to all lines of the regional power distribution network.
S5, analyzing a regional power distribution network line terminal: analyzing the electric energy quality evaluation coefficients corresponding to the electric terminals corresponding to the lines of the regional distribution network at each detection time point according to the images corresponding to the electric terminals corresponding to the lines of the regional distribution network at each detection time point。
S6, comprehensively analyzing the electric energy quality of the regional power distribution network line: and analyzing the electric energy quality evaluation index corresponding to the regional power distribution network.
And S7, the processing terminal displays the power quality evaluation index corresponding to the regional power distribution network.
Further, the electricity consumption includes current and voltage corresponding to each sub-line at each detection time point.
Further, the specific analysis method of the electric energy quality evaluation index corresponding to each detection time point of each line of the regional power distribution network comprises the following steps: extracting the current of each sub-line at each detection time point from the power utilization information corresponding to each line of the regional power distribution network in the set detection periodAnd voltage->Wherein->Expressed as the number of each line>，Expressed as the number of each sub-line, +.>，/>Number expressed as each detection time point, +.>。
Analyzing current quality evaluation indexes corresponding to all lines of regional power distribution network at all detection time pointsWherein->For a predefined safety current, +.>For the number of sub-lines,the regional distribution network is->The line is at->Current deviation evaluation index corresponding to each detection time point, < >>、/>Respectively expressed as a predefined current safety, a corresponding influence weight factor of the current deviation evaluation index, wherein ∈ ->Is a natural constant.
Similarly, analysis areaVoltage quality evaluation index corresponding to each detection time point of each line to which power distribution network belongs。
Comprehensively analyzing electric energy quality evaluation indexes corresponding to all lines of regional power distribution network at all detection time pointsWherein->、/>The duty factors corresponding to the predefined current quality evaluation and the voltage quality evaluation are respectively adopted.
Further, the current deviation evaluation index corresponding to each detection time point of each line of the regional power distribution networkThe specific analysis method comprises the following steps: analyzing the current difference value +.A. of each detection time point and adjacent time point of each sub-line corresponding to each line to which the detection period is set in the regional distribution network>Further, the current difference value (I) of the unit length corresponding to each detection time point and the adjacent time point of each sub-line corresponding to each line to which the detection period belongs in the regional distribution network is built according to the current difference value (I)>。
Extracting a safe current difference value interval of a unit length corresponding to the regional power distribution network from the cloud database, and further extracting a corresponding upper limit value from the safe current difference value intervalAnd lower limit value->。
Analyzing current coincidence coefficients of all lines of regional power distribution network corresponding to all sub-lines at all detection time points。
Marking the sub-lines of which the current coincidence coefficients of the lines belonging to the regional distribution network at all detection time points are smaller than a predefined current coincidence coefficient threshold value as target sub-lines, further obtaining all target sub-lines of the lines belonging to the regional distribution network at all detection time points, and counting the corresponding quantity of the target sub-lines。
Counting the number of corresponding sub-circuits of each circuit to which the regional power distribution network belongsFurther analyzing the current deviation evaluation index +.f corresponding to each line of the regional distribution network at each detection time point>WhereinThe regional distribution network is->The corresponding line is->The strip sub-line is in the +.>Current deviation index for each detection time point.
Further, each line to which the regional power distribution network belongs corresponds to a current deviation index of each sub-line and each adjacent sub-line at each detection time pointThe specific analysis method comprises the following steps: the analysis area distribution network is in a set detection periodThe current difference value of each corresponding sub-line and adjacent sub-line at each detection time point of each belonging line +.>。
Analyzing the allowable current difference value of each sub-line corresponding to each line to which the regional power distribution network belongs according to the allowable current difference value corresponding to each reference length stored in the cloud database。
Analyzing current deviation indexes of each sub-line corresponding to each line to which the regional power distribution network belongs and adjacent sub-lines at each detection time pointWherein->Is a correction factor corresponding to a predefined current deviation index.
Further, the specific analysis method of the electric energy quality evaluation coefficient corresponding to each detection time point of the electric terminal corresponding to each line of the regional power distribution network comprises the following steps: and analyzing the brightness corresponding to each detection time point of each line application terminal of the regional power distribution network according to the image corresponding to each detection time point of each line application terminal of the regional power distribution network.
And extracting the starting brightness and the extinguishing brightness corresponding to the power utilization terminal from the cloud database.
Comparing the brightness corresponding to each line of the regional power distribution network at each detection time point with the extinction brightness corresponding to the power utilization terminal, and if the brightness corresponding to each line of the regional power distribution network at each detection time point is consistent with the extinction brightness corresponding to the power utilization terminal, performing the following analysis:
the control state of each line pair application terminal of the regional power distribution network at the detection time point is obtained from the power utilization terminal monitoring background, wherein the control state comprises opening and closing, and if each line pair application terminal of the regional power distribution network at the detection time pointThe control state is closed, and the power quality evaluation coefficient at the detection time point is marked asOtherwise, it is marked +.>Wherein->。
Acquiring power quality evaluation coefficients corresponding to application power terminals of all lines of regional power distribution network at the detection time pointWherein->。
Otherwise, the following analysis is performed: extracting the brightness corresponding to each detection time point of the application electric terminal of each line pair belonging to the regional power distribution network according to the brightness corresponding to each detection time point of the application electric terminal of each line belonging to the regional power distribution network。
According to the corresponding starting brightness of the power utilization terminalAnalyzing brightness coincidence coefficients +.f corresponding to all lines of regional distribution network to application electric terminals at the detection time point>。
If the detection time point is the first detection time point, taking the brightness coincidence coefficient corresponding to the detection time point of the application electric terminal of each line pair of the regional distribution network as the electric energy quality evaluation coefficient corresponding to the detection time point of the application electric terminal of each line pair of the regional distribution network, otherwise, acquiring the previous time point of the detection time point of the application electric terminal of each line pair of the regional distribution networkLuminance coincidence coefficient at bit detection time pointFurther analyzing the power quality evaluation coefficient (corresponding to the detection time point) of each line pair application electric terminal of the regional power distribution network>，/>And the allowable brightness of the power utilization terminal is predefined and accords with the error of the coefficient.
Acquiring power quality evaluation coefficients corresponding to application power terminals of all lines of regional power distribution network at the detection time pointWherein->。
Acquiring electric energy quality evaluation coefficients corresponding to all detection time points of power application terminals corresponding to all lines of regional power distribution networkWherein->。
Further, the specific analysis method of the electric energy quality assessment index corresponding to the regional power distribution network comprises the following steps: analyzing comprehensive power quality evaluation coefficients corresponding to all lines of regional power distribution network at all detection time points。
Screening various abnormal time points corresponding to the various lines of the regional power distribution network according to the comprehensive power quality evaluation coefficients corresponding to the various lines of the regional power distribution network at various detection time points, and further counting the number of the abnormal time points corresponding to the various lines of the regional power distribution network。
Counting the number of corresponding detection time points of each line of regional power distribution networkFurther, the electric energy quality evaluation index corresponding to the regional distribution network is analyzed>Wherein->For the number of lines>To detect the number of time points.
The second aspect of the invention provides a power quality evaluation system of a direct current power distribution network, comprising: the regional distribution network line dividing module is used for acquiring each line of the regional distribution network, dividing each line of the regional distribution network according to a preset length interval, marking the divided lines as a plurality of sub-lines, and further obtaining a plurality of sub-lines corresponding to each line of the regional distribution network.
The regional power distribution network line detection module is used for detecting currents and voltages of a plurality of sub-lines corresponding to each line of the regional power distribution network, and further obtaining power utilization information corresponding to each line of the regional power distribution network in a set detection period.
The regional distribution network line analysis module is used for analyzing the electric energy quality assessment index corresponding to each line of the regional distribution network at each detection time point according to the electric energy consumption corresponding to each line of the regional distribution network at the set detection period。
The regional distribution network line terminal detection module is used for detecting all the power utilization terminals corresponding to the regional distribution network, and further obtaining images corresponding to all the power utilization terminals corresponding to all the lines of the regional distribution network at all detection time points.
The regional distribution network line terminal analysis module is used for analyzing the power quality evaluation coefficients corresponding to the detection time points of the power utilization terminals corresponding to the lines of the regional distribution network according to the images corresponding to the detection time points of the power utilization terminals corresponding to the lines of the regional distribution network。
And the comprehensive analysis module is used for analyzing the electric energy quality assessment index corresponding to the regional distribution network.
And the processing terminal is used for displaying the power quality evaluation index corresponding to the regional power distribution network.
Compared with the prior art, the embodiment of the invention has at least the following advantages or beneficial effects: (1) According to the method, each line of the regional distribution network is divided in the regional distribution network line division, so that a foundation is laid for line analysis of the subsequent regional distribution network.
(2) The method and the device for detecting the current and the voltage of the divided lines in the line detection of the regional distribution network provide powerful data support for the line analysis of the subsequent regional distribution network.
(3) According to the invention, in the regional distribution network line analysis, not only is the current-voltage consistency of the distribution network line analyzed, but also the current deviation of the line to which the distribution network belongs is analyzed, so that the accuracy of the power quality evaluation result of the distribution network line at the current-voltage level is ensured, and a powerful data support is provided for the power quality analysis of the subsequent distribution network line, so that the safety and reliability of the distribution network are ensured.
(4) The method and the device detect the power utilization terminal of the regional distribution network in the detection of the regional distribution network line terminal, thereby laying a certain foundation for the analysis of the power utilization terminal of the subsequent regional distribution network.
(5) According to the invention, in the analysis of the regional power distribution network line terminal, the power quality of the regional power distribution network power utilization terminal is analyzed through the brightness and the control state of the power utilization terminal, so that the effectiveness of the power utilization terminal quality assessment is ensured, the reference value of the power distribution network quality assessment is improved to a certain extent, and the related maintenance work of related workers of the subsequent power distribution network is facilitated.
Drawings
The invention will be further described with reference to the accompanying drawings, in which embodiments do not constitute any limitation of the invention, and other drawings can be obtained by one of ordinary skill in the art without inventive effort from the following drawings.
FIG. 1 is a flow chart of the method of the present invention.
Fig. 2 is a schematic diagram of the module connection of the present invention.
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, a first aspect of the present invention provides a method for evaluating power quality of a dc power distribution network, including: s1, dividing a regional power distribution network line: obtaining each line of the regional power distribution network, dividing each line of the regional power distribution network according to a preset length interval, marking the divided lines as a plurality of sub-lines, and obtaining a plurality of sub-lines corresponding to each line of the regional power distribution network.
According to the method, each line of the regional distribution network is divided in the regional distribution network line division, so that a foundation is laid for line analysis of the subsequent regional distribution network.
S2, detecting a regional power distribution network line: and detecting the current and the voltage of a plurality of sub-circuits corresponding to each circuit to which the regional power distribution network belongs, and further acquiring the power utilization information corresponding to each circuit to which the regional power distribution network belongs in a set detection period.
In a specific embodiment of the present invention, the electricity consumption includes a current and a voltage corresponding to each sub-line at each detection time point.
It should be noted that, a current and voltage on-line detector is used to detect current and voltage of a plurality of sub-lines corresponding to each line to which the regional power distribution network belongs.
The method and the device for detecting the current and the voltage of the divided lines in the line detection of the regional distribution network provide powerful data support for the line analysis of the subsequent regional distribution network.
S3, analyzing the regional distribution network lines: analyzing the electric energy quality evaluation index corresponding to each line of the regional distribution network at each detection time point according to the electric energy consumption information corresponding to each line of the regional distribution network at the set detection period。
In a specific embodiment of the present invention, the specific analysis method of the power quality assessment index corresponding to each line to which the regional power distribution network belongs at each detection time point includes: extracting the current of each sub-line at each detection time point from the power utilization information corresponding to each line of the regional power distribution network in the set detection periodAnd voltage->Wherein->Indicated as the number of each line,，/>expressed as the number of each sub-line, +.>，/>Expressed as each detection timeThe number of the dots is given by the number,。
analyzing current quality evaluation indexes corresponding to all lines of regional power distribution network at all detection time pointsWherein->For a predefined safety current, +.>For the number of sub-lines,the regional distribution network is->The line is at->Current deviation evaluation index corresponding to each detection time point, < >>、/>Respectively expressed as a predefined current safety, a corresponding influence weight factor of the current deviation evaluation index, wherein ∈ ->Is a natural constant.
Similarly, analyzing voltage quality evaluation indexes corresponding to all lines of regional power distribution network at all detection time points。
Comprehensively analyzing electric energy quality evaluation indexes corresponding to all lines of regional power distribution network at all detection time pointsWherein->、/>The duty factors corresponding to the predefined current quality evaluation and the voltage quality evaluation are respectively adopted.
In a specific embodiment of the present invention, the current deviation evaluation index corresponding to each line to which the regional power distribution network belongs at each detection time pointThe specific analysis method comprises the following steps: analyzing the current difference value +.A. of each detection time point and adjacent time point of each sub-line corresponding to each line to which the detection period is set in the regional distribution network>Further, the current difference value (I) of the unit length corresponding to each detection time point and the adjacent time point of each sub-line corresponding to each line to which the detection period belongs in the regional distribution network is built according to the current difference value (I)>。
It should be noted that, in the construction area distribution network, each line to which the set detection period belongs corresponds to a current difference value of a unit length corresponding to each sub-line at each detection time point and an adjacent time pointThe specific method comprises the following steps: the length corresponding to each line of the regional distribution network in the set detection period is obtained and divided by a preset length interval, so that the length corresponding to each sub-line of each line of the regional distribution network in the set detection period is obtained>。
Constructing each line corresponding to each sub-line of each line of the regional distribution network in the set detection period at each detection time pointCurrent difference per unit length corresponding to adjacent time point。
Extracting a safe current difference value interval of a unit length corresponding to the regional power distribution network from the cloud database, and further extracting a corresponding upper limit value from the safe current difference value intervalAnd lower limit value->。
Analyzing current coincidence coefficients of all lines of regional power distribution network corresponding to all sub-lines at all detection time points。
Marking the sub-lines of which the current coincidence coefficients of the lines belonging to the regional distribution network at all detection time points are smaller than a predefined current coincidence coefficient threshold value as target sub-lines, further obtaining all target sub-lines of the lines belonging to the regional distribution network at all detection time points, and counting the corresponding quantity of the target sub-lines。
Counting the number of corresponding sub-circuits of each circuit to which the regional power distribution network belongsFurther analyzing the current deviation evaluation index +.f corresponding to each line of the regional distribution network at each detection time point>WhereinThe regional distribution network is->The corresponding line is->The strip sub-line is in the +.>Current deviation index for each detection time point.
In a specific embodiment of the present invention, each line to which the regional power distribution network belongs corresponds to a current deviation index of each sub-line and adjacent sub-lines at each detection time pointThe specific analysis method comprises the following steps: analyzing current difference values of each sub-line corresponding to each line of the regional distribution network, to which the set detection period belongs, and each detection time point of adjacent sub-lines。
Analyzing the allowable current difference value of each sub-line corresponding to each line to which the regional power distribution network belongs according to the allowable current difference value corresponding to each reference length stored in the cloud database。
It should be noted that, the allowable current difference value of each line corresponding to each sub-line of each line of the regional power distribution network is as follows: and extracting the numbers of the corresponding sub-circuits of each circuit of the regional power distribution network, which belong to the set detection period, multiplying the numbers by a preset length interval to obtain the length between the corresponding sub-circuits of each circuit of the regional power distribution network and the circuit starting point, and marking the length between the corresponding sub-circuits of each circuit of the regional power distribution network and the circuit starting point as a reference length.
Extracting allowable current difference values corresponding to each reference length from the cloud database, and screening the allowable current difference values corresponding to each sub-line of each line of the regional power distribution network according to the reference length of each line of the regional power distribution network。
Analyzing current deviation indexes of each sub-line corresponding to each line to which the regional power distribution network belongs and adjacent sub-lines at each detection time pointWherein->Is a correction factor corresponding to a predefined current deviation index.
According to the invention, in the regional distribution network line analysis, not only is the current-voltage consistency of the distribution network line analyzed, but also the current deviation of the line to which the distribution network belongs is analyzed, so that the accuracy of the power quality evaluation result of the distribution network line at the current-voltage level is ensured, and a powerful data support is provided for the power quality analysis of the subsequent distribution network line, so that the safety and reliability of the distribution network are ensured.
S4, detecting a regional power distribution network line terminal: and detecting all the power utilization terminals corresponding to the regional power distribution network, and further acquiring images corresponding to all detection time points of the power utilization terminals corresponding to all lines of the regional power distribution network.
The method and the device detect the power utilization terminal of the regional distribution network in the detection of the regional distribution network line terminal, thereby laying a certain foundation for the analysis of the power utilization terminal of the subsequent regional distribution network.
S5, analyzing a regional power distribution network line terminal: analyzing the electric energy quality evaluation coefficients corresponding to the electric terminals corresponding to the lines of the regional distribution network at each detection time point according to the images corresponding to the electric terminals corresponding to the lines of the regional distribution network at each detection time point。
In a specific embodiment of the present invention, the specific analysis method of the power quality evaluation coefficient corresponding to each detection time point at each line application electric terminal to which the regional power distribution network belongs includes: and analyzing the brightness corresponding to each detection time point of each line application terminal of the regional power distribution network according to the image corresponding to each detection time point of each line application terminal of the regional power distribution network.
The specific analysis method of the brightness of the power application terminal corresponding to each line of the regional power distribution network at each detection time point comprises the following steps: and randomly selecting the distribution points from the images of the application terminals of the lines belonging to the regional distribution network at each detection time point, and further acquiring the brightness of the distribution points of the application terminals of the lines belonging to the regional distribution network at each detection time point.
And eliminating the maximum brightness and the minimum brightness in the brightness of each distribution point of each line application terminal of the regional power distribution network at each detection time point, further carrying out average value processing on all the rest brightness, and taking the processing result as the brightness of each line application terminal of the regional power distribution network at each detection time point.
And extracting the starting brightness and the extinguishing brightness corresponding to the power utilization terminal from the cloud database.
The off-state luminance is the luminance at which the power terminal is turned off.
Comparing the brightness corresponding to each line of the regional power distribution network at each detection time point with the extinction brightness corresponding to the power utilization terminal, and if the brightness corresponding to each line of the regional power distribution network at each detection time point is consistent with the extinction brightness corresponding to the power utilization terminal, performing the following analysis: the control state of each line of the regional power distribution network to the application power terminal at the detection time point is obtained from the power consumption terminal monitoring background, wherein the control state comprises opening and closing, and if the control state of each line of the regional power distribution network to the application power terminal at the detection time point is closing, the power quality evaluation coefficient at the detection time point is marked as followsOtherwise, it is marked +.>Wherein->。
Acquiring power quality evaluation coefficients corresponding to application power terminals of all lines of regional power distribution network at the detection time pointWherein->。
Otherwise, the following analysis is performed: extracting the brightness corresponding to each detection time point of the application electric terminal of each line pair belonging to the regional power distribution network according to the brightness corresponding to each detection time point of the application electric terminal of each line belonging to the regional power distribution network。
According to the corresponding starting brightness of the power utilization terminalAnalyzing brightness coincidence coefficients +.f corresponding to all lines of regional distribution network to application electric terminals at the detection time point>。
If the detection time point is the first detection time point, taking the brightness coincidence coefficient corresponding to the detection time point of the application electric terminal of each line pair of the regional power distribution network as the power quality evaluation coefficient corresponding to the detection time point of the application electric terminal of each line pair of the regional power distribution network, otherwise, acquiring the brightness coincidence coefficient of the detection time point of the previous detection time point of the application electric terminal of each line pair of the regional power distribution networkFurther analyzing the power quality evaluation coefficient (corresponding to the detection time point) of each line pair application electric terminal of the regional power distribution network>，/>And the allowable brightness of the power utilization terminal is predefined and accords with the error of the coefficient.
Acquiring power quality evaluation coefficients corresponding to application power terminals of all lines of regional power distribution network at the detection time pointWherein->。
Acquiring electric energy quality evaluation coefficients corresponding to all detection time points of power application terminals corresponding to all lines of regional power distribution networkWherein->。
According to the invention, in the analysis of the regional power distribution network line terminal, the power quality of the regional power distribution network power utilization terminal is analyzed through the brightness and the control state of the power utilization terminal, so that the effectiveness of the power utilization terminal quality assessment is ensured, the reference value of the power distribution network quality assessment is improved to a certain extent, and the related maintenance work of related workers of the subsequent power distribution network is facilitated.
S6, comprehensively analyzing the electric energy quality of the regional power distribution network line: and analyzing the electric energy quality evaluation index corresponding to the regional power distribution network.
In a specific embodiment of the present invention, the specific analysis method of the power quality assessment index corresponding to the regional power distribution network includes: analyzing comprehensive power quality evaluation coefficients corresponding to all lines of regional power distribution network at all detection time points。
Screening various abnormal time points corresponding to the lines of the regional power distribution network according to the comprehensive power quality evaluation coefficients corresponding to the detection time points of the lines of the regional power distribution network, and further counting the lines of the regional power distribution networkNumber of road-corresponding abnormal time points。
It should be noted that, the specific method of each abnormal time point corresponding to each line of the regional power distribution network is as follows: and comparing the comprehensive power quality evaluation coefficient corresponding to each line of the regional power distribution network at each detection time point with a predefined comprehensive power quality evaluation coefficient threshold, and if the comprehensive power quality evaluation coefficient corresponding to a certain line of the regional power distribution network at a certain detection time point is smaller than the comprehensive power quality evaluation coefficient threshold, marking the time point as an abnormal time point, thereby obtaining each abnormal time point corresponding to each line of the regional power distribution network.
Counting the number of corresponding detection time points of each line of regional power distribution networkFurther, the electric energy quality evaluation index corresponding to the regional distribution network is analyzed>Wherein->For the number of lines>To detect the number of time points.
S7, processing the terminal: and displaying the electric energy quality evaluation index corresponding to the regional distribution network.
Referring to fig. 2, a second aspect of the present invention provides a power quality evaluation system for a dc power distribution network, including: the regional distribution network line dividing module is used for acquiring each line of the regional distribution network, dividing each line of the regional distribution network according to a preset length interval, marking the divided lines as a plurality of sub-lines, and further obtaining a plurality of sub-lines corresponding to each line of the regional distribution network.
The regional power distribution network line detection module is used for detecting currents and voltages of a plurality of sub-lines corresponding to each line of the regional power distribution network, and further obtaining power utilization information corresponding to each line of the regional power distribution network in a set detection period.
The regional distribution network line analysis module is used for analyzing the electric energy quality assessment index corresponding to each line of the regional distribution network at each detection time point according to the electric energy consumption corresponding to each line of the regional distribution network at the set detection period。
The regional distribution network line terminal detection module is used for detecting all the power utilization terminals corresponding to the regional distribution network, and further obtaining images corresponding to all the power utilization terminals corresponding to all the lines of the regional distribution network at all detection time points.
The regional distribution network line terminal analysis module is used for analyzing the power quality evaluation coefficients corresponding to the detection time points of the power utilization terminals corresponding to the lines of the regional distribution network according to the images corresponding to the detection time points of the power utilization terminals corresponding to the lines of the regional distribution network。
And the comprehensive analysis module is used for analyzing the electric energy quality assessment index corresponding to the regional distribution network.
And the processing terminal is used for displaying the power quality evaluation index corresponding to the regional power distribution network.
It should be noted that, the power quality evaluation system of the direct current distribution network further comprises a cloud database, wherein the cloud database is used for storing a safe current difference interval of a corresponding unit length of the regional distribution network, an allowable current difference value corresponding to each reference length, and on-luminance and off-luminance corresponding to the power utilization terminal.
The cloud database is connected with the regional distribution network line analysis module and the regional distribution network line terminal analysis module respectively.
The foregoing is merely illustrative of the structures of this invention and various modifications, additions and substitutions for those skilled in the art of describing particular embodiments without departing from the structures of the invention or exceeding the scope of the invention as defined by the claims.
Claims (6)
1. The power quality evaluation method of the direct-current power distribution network is characterized by comprising the following steps of:
s1, dividing a regional power distribution network line: acquiring each line of the regional power distribution network, dividing each line of the regional power distribution network according to a preset length interval, marking the divided lines as a plurality of sub-lines, and obtaining a plurality of sub-lines corresponding to each line of the regional power distribution network;
s2, detecting a regional power distribution network line: detecting currents and voltages of a plurality of sub-circuits corresponding to each circuit to which the regional power distribution network belongs, and further obtaining power utilization information corresponding to each circuit to which the regional power distribution network belongs in a set detection period;
s3, analyzing the regional distribution network lines: analyzing the electric energy quality evaluation index corresponding to each line of the regional distribution network at each detection time point according to the electric energy consumption information corresponding to each line of the regional distribution network at the set detection period；
S4, detecting a regional power distribution network line terminal: detecting all the power utilization terminals corresponding to the regional power distribution network, and further obtaining images corresponding to all detection time points of the power utilization terminals corresponding to all lines of the regional power distribution network;
s5, analyzing a regional power distribution network line terminal: analyzing the electric energy quality evaluation coefficients corresponding to the electric terminals corresponding to the lines of the regional distribution network at each detection time point according to the images corresponding to the electric terminals corresponding to the lines of the regional distribution network at each detection time point；
S6, comprehensively analyzing the electric energy quality of the regional power distribution network line: analyzing a power quality evaluation index corresponding to the regional power distribution network;
s7, processing the terminal: displaying the electric energy quality evaluation index corresponding to the regional distribution network;
the specific analysis method of the electric energy quality evaluation coefficient corresponding to each line application electric terminal of the regional power distribution network at each detection time point comprises the following steps:
analyzing the brightness corresponding to each detection time point of each line application terminal of the regional power distribution network according to the image corresponding to each detection time point of each line application terminal of the regional power distribution network;
extracting the starting brightness and the extinguishing brightness corresponding to the power utilization terminal from the cloud database;
comparing the brightness corresponding to each line of the regional power distribution network at each detection time point with the extinction brightness corresponding to the power utilization terminal, and if the brightness corresponding to each line of the regional power distribution network at each detection time point is consistent with the extinction brightness corresponding to the power utilization terminal, performing the following analysis:
the control state of each line of the regional power distribution network to the application power terminal at the detection time point is obtained from the power consumption terminal monitoring background, wherein the control state comprises opening and closing, and if the control state of each line of the regional power distribution network to the application power terminal at the detection time point is closing, the power quality evaluation coefficient at the detection time point is marked as followsOtherwise, it is marked +.>Wherein->；
Acquiring power quality evaluation coefficients corresponding to application power terminals of all lines of regional power distribution network at the detection time pointWherein->；
Otherwise, the following analysis is performed: extracting the brightness corresponding to each detection time point of the application electric terminal of each line pair belonging to the regional power distribution network according to the brightness corresponding to each detection time point of the application electric terminal of each line belonging to the regional power distribution network；
According to the corresponding starting brightness of the power utilization terminalAnalyzing brightness coincidence coefficients +.f corresponding to all lines of regional distribution network to application electric terminals at the detection time point>；
If the detection time point is the first detection time point, taking the brightness coincidence coefficient corresponding to the detection time point of the application electric terminal of each line pair of the regional power distribution network as the power quality evaluation coefficient corresponding to the detection time point of the application electric terminal of each line pair of the regional power distribution network, otherwise, acquiring the brightness coincidence coefficient of the detection time point of the previous detection time point of the application electric terminal of each line pair of the regional power distribution networkFurther analyzing the power quality evaluation coefficient (corresponding to the detection time point) of each line pair application electric terminal of the regional power distribution network>，/>Error of the allowable brightness coincidence coefficient for the predefined power utilization terminal;
acquiring power quality evaluation coefficients corresponding to application power terminals of all lines of regional power distribution network at the detection time pointWherein->；
Acquiring electric energy quality evaluation coefficients corresponding to all detection time points of power application terminals corresponding to all lines of regional power distribution networkWherein->；
The specific analysis method of the electric energy quality assessment index corresponding to the regional power distribution network comprises the following steps:
analyzing comprehensive power quality evaluation coefficients corresponding to all lines of regional power distribution network at all detection time points，；
Screening various abnormal time points corresponding to all lines of the regional power distribution network according to comprehensive power quality evaluation coefficients corresponding to all lines of the regional power distribution network at various detection time points, and further counting the regional power distribution networkThe number of abnormal time points corresponding to each line；
Counting the number of corresponding detection time points of each line of regional power distribution networkFurther, the electric energy quality evaluation index corresponding to the regional distribution network is analyzed>Wherein->For the number of lines>To detect the number of time points.
2. The method for evaluating the power quality of a direct current power distribution network according to claim 1, wherein: the electricity consumption information comprises current and voltage corresponding to each sub-line at each detection time point.
3. The method for evaluating the power quality of a direct current power distribution network according to claim 2, wherein: the specific analysis method of the electric energy quality assessment index corresponding to each detection time point of each line of the regional power distribution network comprises the following steps:
extracting the current of each sub-line at each detection time point from the power utilization information corresponding to each line of the regional power distribution network in the set detection periodAnd voltage->Wherein->Expressed as the number of each line>，/>Expressed as the number of each sub-line, +.>，/>Number expressed as each detection time point, +.>；
Analyzing current quality evaluation indexes corresponding to all lines of regional power distribution network at all detection time pointsWherein->For a predefined safety current, +.>For the number of sub-lines +.>The regional distribution network is->The line is at->Current deviation evaluation index corresponding to each detection time point, < >>、/>Respectively expressed as a predefined current safety, a corresponding influence weight factor of the current deviation evaluation index, wherein ∈ ->Is a natural constant;
similarly, analyzing voltage quality evaluation indexes corresponding to all lines of regional power distribution network at all detection time points；
Comprehensively analyzing electric energy quality evaluation indexes corresponding to all lines of regional power distribution network at all detection time pointsWherein->、/>The duty factors corresponding to the predefined current quality evaluation and the voltage quality evaluation are respectively adopted.
4. A method for evaluating the power quality of a dc power distribution network according to claim 3, wherein: the current deviation evaluation index corresponding to each detection time point of each line to which the regional power distribution network belongsThe specific analysis method comprises the following steps:
analyzing the current difference value of each sub-line corresponding to each line of the regional distribution network at each detection time point and adjacent time points of each line to which the detection period is setAnd then construct the area distribution network in the set detection periodThe current difference value of unit length corresponding to each sub-line at each detection time point and adjacent time point of each line>；
Extracting a safe current difference value interval of a unit length corresponding to the regional power distribution network from the cloud database, and further extracting a corresponding upper limit value from the safe current difference value intervalAnd lower limit value->；
Analyzing current coincidence coefficients of all lines of regional power distribution network corresponding to all sub-lines at all detection time points；
Marking the sub-lines of which the current coincidence coefficients of the lines belonging to the regional distribution network at all detection time points are smaller than a predefined current coincidence coefficient threshold value as target sub-lines, further obtaining all target sub-lines of the lines belonging to the regional distribution network at all detection time points, and counting the corresponding quantity of the target sub-lines；
Counting the number of corresponding sub-circuits of each circuit to which the regional power distribution network belongsFurther analyzing the current deviation evaluation index +.f corresponding to each line of the regional distribution network at each detection time point>Wherein->The regional distribution network is->The corresponding line is->The strip sub-line is in the +.>Current deviation index for each detection time point.
5. The method for evaluating the power quality of a direct current power distribution network according to claim 4, wherein: the current deviation indexes of all the lines of the regional distribution network corresponding to all the sub-lines and adjacent sub-lines at all the detection time pointsThe specific analysis method comprises the following steps:
analyzing current difference values of each sub-line corresponding to each line of the regional distribution network, to which the set detection period belongs, and each detection time point of adjacent sub-lines；
Analyzing the allowable current difference value of each sub-line corresponding to each line to which the regional power distribution network belongs according to the allowable current difference value corresponding to each reference length stored in the cloud database；
Analyzing current deviation indexes of each sub-line corresponding to each line to which the regional power distribution network belongs and adjacent sub-lines at each detection time pointWherein->Is a correction factor corresponding to a predefined current deviation index.
6. A dc power distribution network power quality assessment system for performing a dc power distribution network power quality assessment method according to claim 1, comprising:
the regional power distribution network line dividing module is used for acquiring each line of the regional power distribution network, dividing each line of the regional power distribution network according to a preset length interval, marking the divided lines as a plurality of sub-lines, and further obtaining a plurality of sub-lines corresponding to each line of the regional power distribution network;
the regional power distribution network line detection module is used for detecting currents and voltages of a plurality of sub-lines corresponding to each line of the regional power distribution network, and further obtaining power utilization information corresponding to each line of the regional power distribution network in a set detection period;
the regional distribution network line analysis module is used for analyzing the electric energy quality assessment index corresponding to each line of the regional distribution network at each detection time point according to the electric energy consumption corresponding to each line of the regional distribution network at the set detection period；
The regional distribution network line terminal detection module is used for detecting all the power utilization terminals corresponding to the regional distribution network, and further obtaining images corresponding to the power utilization terminals corresponding to the lines of the regional distribution network at each detection time point;
the regional distribution network line terminal analysis module is used for analyzing the power quality evaluation coefficients corresponding to the detection time points of the power utilization terminals corresponding to the lines of the regional distribution network according to the images corresponding to the detection time points of the power utilization terminals corresponding to the lines of the regional distribution network；
The regional distribution network line power quality comprehensive analysis module is used for analyzing a power quality assessment index corresponding to the regional distribution network;
and the processing terminal is used for displaying the power quality evaluation index corresponding to the regional power distribution network.
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