CN111398859A - User low-voltage cause big data analysis method and system - Google Patents
User low-voltage cause big data analysis method and system Download PDFInfo
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Abstract
A user low-voltage cause big data analysis method and a system thereof are provided, the method comprises the steps that a user ammeter is used for collecting voltage data of a user side, a station area electric energy meter collecting device is used for collecting three-phase voltage, current, reactive power and active power electric quantity data of a power supply outlet side, and a transformer substation bus voltage collecting device is used for collecting three-phase or two-phase bus voltage data; and respectively generating a user side low voltage event, a platform area outlet low voltage event and a bus low voltage event. And automatically analyzing the low voltage reason of each user by a user low voltage cause big data analysis system by utilizing the user side voltage data, the platform area outlet voltage data and the bus voltage data. The system is a computer device comprising a memory, a processor, and a computer program stored on the memory and executable on the processor. The invention fully utilizes the existing electric acquisition device of the electric energy meter in the transformer area and the bus voltage acquisition of the transformer substation, does not need to add new hardware, and realizes the analysis of the low voltage cause of the transformer area through the executable program code of the computer.
Description
Technical Field
The invention relates to a method and a system for analyzing big data of a user low-voltage cause, and belongs to the technical field of power distribution and utilization.
Background
At present, in order to improve the power consumption experience of users, the power supply enterprises develop HP L C electric meter upgrading and reconstruction on the user side to realize 15-minute acquisition of user side voltage, but meanwhile, large data analysis is not carried out on massive user voltage data, and comprehensive analysis is not carried out on the user low voltage by combining operation data of connected transformer areas and 10kV lines.
According to the method and the system for analyzing the big data of the user low-voltage cause, line parameters of a 0.4kV low-voltage line and a 10kV line are not needed to be mastered, the analysis of the user low-voltage cause can be realized only by collecting the user voltage, the three-phase voltage, the current, the active electric quantity and the reactive electric quantity of the low-voltage side of the outlet of a transformer area and the voltage condition of a 10kV line bus of the transformer area, and operation and maintenance personnel can know the reason of the user low voltage without carrying out corresponding low-voltage investigation work.
Disclosure of Invention
The invention aims to solve the technical problem of providing a method and a system for analyzing big data of a user low-voltage cause in order to timely and accurately find out the reason of the user low-voltage cause.
The technical scheme for realizing the invention is as follows: a user low-voltage cause big data analysis method comprises the steps that a user ammeter is used for collecting user side voltage data, a transformer area electric energy meter collecting device is used for collecting three-phase voltage, current, reactive power and active power electric quantity data of a power supply outlet side, and a transformer substation bus voltage collecting device is used for collecting three-phase or two-phase bus voltage data; respectively generating a user side low voltage event, a platform area outlet low voltage event and a bus low voltage event; the reason of the low-voltage event at the user side at each time is defaulted to be the 0.4kV low-voltage line net rack problem, and the reason of the low-voltage event at the outlet at each time is defaulted to be the 10kV line net rack problem; and automatically analyzing the low voltage reason of each user by a user low voltage reason big data analysis system.
The user side low voltage event generation rule and method: storing user side voltage data acquired by a user electric meter into a user voltage operation table, wherein the table name is defined as ur _ operation _ data, and the fields comprise a user number, a user name, a station area number, acquisition time and a voltage value, reading the user voltage operation table in a program according to an analysis period, if the three-phase user three-phase voltage is obtained, obtaining the minimum value of the user side voltage of each acquisition point, if the single-phase user is obtained, the user side voltage of each acquisition point is the minimum value, and newly adding the ur _ minvlot in the program; if the voltage values of the users are less than 198V for one hour or more continuously, generating a user low voltage event, newly adding a user low voltage reason field ur _ lowvlot _ replay in a program, setting the default value to be 0.4kV line net rack problem as '9', storing the user low voltage event obtained by calculation into a user low voltage event data table, defining the table name to be ur _ operation _ et, and enabling the fields to comprise fields such as a user number, a user name, a station area number of the user, starting time, ending time, a minimum value, a low voltage reason and the like.
The generation rule and the method of the platform area outlet low-voltage event are as follows: the method comprises the steps that three-phase voltage data collected by a station area collection device and at an outlet of a station area are stored in a user voltage operation table, the table name is defined as pb _ operation _ data, fields comprise a distribution number, collection time, a three-phase voltage value and a three-phase current value, the station area voltage operation table is read in a program according to an analysis period, the minimum value of the three-phase voltage at the outlet of the station area of each collection point is obtained, and a field dt _ minvlot is newly added in the program; if the minimum value of the three-phase voltage of the outlet of the transformer area is less than 198V for one hour or more continuously, generating a transformer area outlet low-voltage event, newly adding an outlet low-voltage reason field dt _ lowvlot _ reason in a program, setting the default value to be 10kV line grid problems, setting the default value to be 6, storing the calculated transformer area low-voltage event into a transformer area low-voltage event data table, defining the table name to be pb _ operation _ et, and storing the fields comprising a transformer area number, a transformer area name, a bus number to which the transformer area belongs, starting time, ending time, a minimum value, a low-voltage reason and other fields.
The bus low-voltage event generation rule and method are as follows: storing three-phase or two-phase bus voltage data acquired by a substation bus voltage acquisition device into a bus voltage operation table, wherein the table name is defined as bs _ operation _ data; taking the minimum value of the three-phase voltage of the 10kV bus of each acquisition point, and setting a field bs _ minvlot in a program; and if the minimum value of the 10kV bus voltage is less than 9.5kV for one hour or more continuously, generating a bus low-voltage event, storing the calculated bus low-voltage event into a bus low-voltage event data table, defining the table name as bs _ operation _ et, and enabling fields to comprise bus numbers, bus names, starting time, ending time, minimum values and other fields.
The automatic analysis analyzes the low voltage reason of the user on the basis of analyzing the low voltage reason of the platform area outlet, so as to form a user low voltage reason analysis result;
the reasons for the low voltage at the outlet of the platform area are analyzed in two steps as follows:
the first analysis step was as follows:
(1) when a low-voltage event occurs, if the acquisition point of the zenith area is smaller than 24 points, the acquisition problem of the station area collector is determined, and the dt _ lowvlot _ replay field in the current exit low-voltage event is reset to be 0, which indicates the acquisition problem of the station area collector; otherwise, entering the step (2);
(2) when a low-voltage event occurs, calculating the average value of the three-phase voltage of each acquisition point during the event; whether the average minimum value of the three-phase voltage of each acquisition point is greater than 198V or not during the event; if yes, judging that the three-phase unbalance problem of the transformer area is caused by the current low-voltage event, and resetting the dt _ lowvlot _ replay field of the current transformer area outlet voltage low-voltage event to be 1, so that the three-phase load unbalance problem of the transformer area is represented; otherwise, entering the step (3);
(3) if yes, judging the current low-voltage event reason as the problem of the fault of the phase interruption and the poor contact of the transformer area, resetting a dt _ lowvlot _ replay field of the current transformer area outlet low-voltage event to be '2' to represent the problem of the fault of the phase interruption and the poor contact of the transformer area, and otherwise, entering the next step of analysis;
① if there is a u at a certain collection point within the event occurrence timea+ub-uc|<50V, and max (u)a,ub,uc)>198V, judging the platform area to be the defect problems of phase failure and poor contact, namely Yyn0 transformation defect problem is phase C, and Dyn11 transformation defect problem is phase A;
② if there is a u at a certain collection point within the event occurrence timea+uc-ub|<50V, and max (u)a,ub,uc)>198V, judging the platform area to be the defect problems of phase failure and poor contact, namely Yyn0 transformation defect problem is B phase, and Dyn11 transformation defect problem is C phase;
③ if there is a u at a certain collection point within the event occurrence timec+ub-ua|<50V, and max (u)a,ub,uc)>198V, judging the platform area to be the phase failure and poor contact defect problem, namely Yyn0 distribution defect problem is phase A, and Dyn11 distribution defect problem is phase B;
wherein: u. ofa、ub、ucThree-phase outlet voltage data sequences of outlets a, b and c of the transformer area during a low-voltage event;
the second step of analysis:
(1) grouping the outlet low-voltage events of the transformer area by day according to the affiliated 10kV lines, and searching for outlet low-voltage events with all outlet low-voltage reasons dt _ lowvlot _ reacson fields set to be 6; whether a 10kV bus low-voltage event exists within the outlet low-voltage time or not; if the bus low-voltage problem exists, the current outlet low-voltage event is judged to be the bus low-voltage problem, and the dt _ lowvlot _ reason field of the current transformer area outlet low-voltage event is reset to be 4, which indicates that the cause of the transformer area outlet low-voltage event is caused by the bus low-voltage problem;
(2) grouping the low-voltage events at the outlets of the transformer areas by 10kV lines on a daily basis, and searching for an event with a field value of '2' of dt _ lowvlot _ reason of the low-voltage events at the outlets of all the transformer areas due to phase failure and poor contact defects; if the problems of line breakage and poor contact of 10kV lines exist in 2 or more transformer area low-voltage events, setting a dt _ lowvlot _ reason field of a transformer area outlet low-voltage event to be '2' and resetting the dt _ lowvlot _ reason field to be '5', wherein the transformer area outlet low-voltage which indicates the problems of the line breakage and poor contact is caused by the line defect;
(3) grouping the station area outlet low-voltage events by 10kV lines by days, searching for all events of which the distribution transformer outlet low-voltage events are caused by the 10kV line grid structure problem dt _ lowvlot _ reason, wherein the field value is 6, if distribution transformers smaller than 2 exist, judging that the related station area has the distribution transformer gear problem, and resetting the low-voltage event dt _ lowvlot _ reason field of the current station area outlet to be 2 to be 3.
The user low voltage analysis steps are as follows:
(1) when a user low-voltage event occurs, if the user acquisition point is less than 24 points on the day, determining that the user-side ammeter acquires a problem; resetting the ur _ lowvlot _ relay field in the low-voltage event at the outlet of the transformer area to be 7, and indicating the collection problem of the electric meter at the user side; otherwise, entering the step (2);
(2) grouping the low-voltage events at the user side by station area by day, searching whether a low-voltage event at the outlet of the station area exists in the low-voltage time with the low-voltage event ur _ lowvlot _ replay field of all users as '9', and if so, assigning the low-voltage event dt _ lowvlot _ replay field at the outlet of the station area at the same moment to the related low-voltage event ur _ lowvlot _ replay field;
(3) grouping the low-voltage events at the user side by station area by day, searching for the event of which the low-voltage event field value is 9 because of the 0.4kV low-voltage line network frame problem ur _ lowvlot _ relay again, judging the related user as a single-user service line problem if the user is less than 2 users, and resetting the low-voltage event dt _ lowvlot _ relay field value of the exit of the station area to be 9 to be 8.
The voltage data of the user side is collected, and the collection interval is generally 15 minutes or 30 minutes; collecting three-phase voltage, current, reactive power and active power electric quantities at the outlet side of the transformer area, wherein the sampling interval is generally 15 minutes or 30 minutes; collecting three-phase or two-phase bus voltage data, wherein the collection interval is generally 15 minutes or 30 minutes; storing the time sequence data to a background database; the system is divided into a user voltage operation table, a platform area operation data table and a bus voltage data table.
A user low voltage cause big data analysis system, which is a computer device comprising a memory, a processor and a computer program stored on the memory and executable on the processor, wherein the processor executes the program to implement the following steps:
(1) the method comprises the steps that a user ammeter is used for collecting voltage data of a user side, and the collecting interval is generally 15 minutes or 30 minutes; the method comprises the following steps of collecting three-phase voltage, current, reactive power and active power electrical quantities at the power supply outlet side by using a district electric energy meter collecting device, wherein the sampling interval is generally 15 minutes or 30 minutes; acquiring three-phase or two-phase bus voltage data by using a bus voltage acquisition device of a transformer substation, wherein the acquisition interval is generally 15 minutes or 30 minutes, and storing time sequence data into a background database;
(2) generating a user side low voltage event, a platform area outlet low voltage event and a bus low voltage event for the collected user side voltage data, platform area outlet voltage data and 10kV bus voltage data;
(3) judging a user outlet low voltage generation event, taking the minimum value of the user side voltage of each acquisition point, newly adding a field ur _ minvlot in the program, if the user voltage values are less than 198V for one hour or more continuously, generating a user low voltage event, newly adding a user low voltage reason field ur _ lowvlot _ replay in the program, setting the default value to be 0.4kV line grid problem, and setting the default value to be 9%;
(4) judging a platform area outlet low-voltage generation event, taking the minimum value of outlet three-phase voltage of each acquisition point platform area, newly adding a field dt _ minvlot in a program, if the minimum value of the outlet three-phase voltage of each acquisition point platform area is less than 198V for one hour or more continuously, generating the platform area outlet low-voltage event, newly adding an outlet low-voltage reason field dt _ lowvlot _ reason in the program, setting the default value to be 10kV line grid frame problem to be 6;
(5) judging a 10kV bus outlet low-voltage generation event, taking the minimum value of the 10kV bus three-phase voltage of each acquisition point, setting a field bs _ minvlot in a program, and generating a bus low-voltage event if the 10kV bus voltage minimum values are less than 9.5kV for one hour or more continuously;
(6) preliminary analysis of the cause of low voltage at the outlet of the area
When a low-voltage event occurs, if the acquisition point of the sky table area is smaller than 24 points, the acquisition problem of the table area collector is judged, and the dt _ lowvlot _ reason field in the table area outlet low-voltage event and sequence is reset to be 0, which represents the acquisition problem of the table area collector;
calculating the average value of the three-phase voltage of each acquisition point during an event, judging whether the average minimum value of the three-phase voltage of each acquisition point during the event is greater than 198V, and if so, judging that the three-phase imbalance problem of the transformer area exists;
calculating whether the problems of poor contact and phase failure exist when a low-voltage event occurs;
(7) further analyzing the reason of low voltage at the outlet of the platform area
Grouping the outlet low-voltage events of the transformer area by day according to the affiliated 10kV lines, searching outlet low-voltage events with dt _ lowvlot _ reason fields in all outlet low-voltage reason programs set as 6, and judging whether 10kV bus low-voltage events exist in the outlet low-voltage time;
grouping the platform outlet low-voltage events by 10kV lines by day, searching for all the platform outlet low-voltage reasons due to phase failure and poor contact defects, namely, events with a dt _ lowvlot _ reason field value of 2 in a program, if 2 or more platform outlet low-voltage events exist, judging that the 10kV lines have the problems of line breakage and poor contact defects, resetting the dt _ lowvlot _ reason field in the related platform outlet low-voltage event program to be 5, and indicating that the platform outlet low-voltage of the defect problems of line breakage, poor contact and the like is caused by the line defect problems;
grouping the station area outlet low-voltage events by 10kV lines by day, searching all distribution transformer outlet low-voltage events again because of the 10kV line grid structure problem, namely, the event with the dt _ lowvlot _ reason field value of 6 in the program, if the distribution transformer with less than 2 stations exists, judging the related station area as the station area distribution transformer gear problem, and resetting the dt _ lowvlot _ reason field in the related station area outlet low-voltage event program to be 3;
(8) further analyzing the reason of low voltage of user
When a user low-voltage event occurs, if the user acquisition point is less than 24 points on the day, determining that the user-side ammeter acquires a problem; resetting the ur _ lowvlot _ relay field in the low-voltage event at the outlet of the transformer area to be 7, and indicating the collection problem of the electric meter at the user side; otherwise, entering the next step;
grouping the low-voltage events at the user side by station area by day, searching whether a low-voltage event at the outlet of the station area exists in the low-voltage time with the low-voltage event ur _ lowvlot _ replay field of all users as '9', and if so, assigning the low-voltage event dt _ lowvlot _ replay field at the outlet of the station area to the low-voltage event ur _ lowvlot _ replay field of the related user;
grouping low-voltage events at a user side by station area by day, searching for an event of which the value of the low-voltage event field of all users is 9 because of the 0.4kV low-voltage line grid structure problem ur _ lowvlot _ relay, judging the related user as a single-user service line problem if the user is less than 2 users, and resetting the low-voltage event ur _ lowvlot _ relay field of the related user to be 8;
(9) form the analysis result of the user low voltage reason
And performing statistical analysis on all the user low-voltage events in the statistical period to obtain 10 types of statistical results such as a user ammeter acquisition problem, a single-user service line access problem, a 0.4kV low-voltage line network frame problem, a distribution area acquisition problem, a three-phase imbalance problem, a distribution area defect problem, an unreasonable gear problem, a 10kV line defect problem, a low bus voltage, a 10kV line network frame problem and the like.
Compared with the traditional user low-voltage analysis and manual troubleshooting method, the user outlet low-voltage cause big data analysis method has the advantages that the parameters of 0.4kV lines and 10kV lines are not required to be considered, the user low-voltage 10-class cause automatic analysis can be realized only by utilizing the user voltage data, the station area outlet data and the 10kV line bus voltage data, the types of analysis results are multiple, the user low-voltage cause analysis result is fine and reasonable, and the practical requirement is met. According to the method and the system for analyzing the low-voltage cause of the user outlet, the existing electrical acquisition devices of the user side electric meter and the platform area electric energy meter and the substation bus voltage acquisition device are fully utilized, no additional hardware is needed, and the low-voltage cause analysis of the user is realized through a computer executable program code. The method is only suitable for analyzing the low-voltage cause of the user, provides 10 types of cause judgment rules of the low-voltage cause of the user, obtains the cause of each low-voltage event of the user by utilizing a big data technology, and can provide auxiliary reference for low-voltage treatment of the low-voltage user.
Drawings
FIG. 1 is a flow chart of a method for analyzing big data of low voltage cause at a user outlet according to the present invention.
Detailed Description
As shown in fig. 1, the method for analyzing big data of low voltage cause of a user in this embodiment includes the following steps:
first, data acquisition
The method comprises the steps of storing operation data such as user voltage data collected by a user ammeter, station outlet voltage and current collected by a station electricity collection device and 10kV bus voltage data collected by a substation bus voltage collection device into a background database, and dividing the operation data into a user operation data table (ur _ operation _ data), a station operation data table (pb _ operation _ data) and a bus voltage data table (bs _ operation _ data).
Second, data preprocessing
And field data such as specified user voltage, three-phase voltage of an outlet of a transformer area, three-phase current of the transformer area, bus voltage and the like cannot be null. For a user, if the user voltage data of a certain acquisition point is empty, deleting the data of the acquisition point data; for a distribution room, if only one field of data of three-phase voltage and three-phase current of a certain acquisition point is empty, deleting data of the acquisition point; for 10kV bus voltage, if two or three field data of the three-phase voltage of a certain acquisition point are null, the data of the acquisition point are deleted. And after data preprocessing, respectively sequencing the user voltage data, the transformer area data and the 10kV bus voltage in an ascending order according to the acquisition time.
Third, generating low voltage event
Determining and analyzing a user low-voltage time period, generating a corresponding low-voltage event according to the user low voltage, the platform area outlet low voltage and the 10kV bus voltage data, and judging the low-voltage event rule as follows:
the user side low voltage event generation rule and method: storing user side voltage data acquired by a user electric meter into a user voltage operation table, wherein the table name is defined as ur _ operation _ data, and the fields comprise a user number, a user name, a station area number, acquisition time and a voltage value, reading the user voltage operation table in a program according to an analysis period, if the three-phase user three-phase voltage is obtained, obtaining the minimum value of the user side voltage of each acquisition point, if the single-phase user is obtained, the user side voltage of each acquisition point is the minimum value, and newly adding the ur _ minvlot in the program; if the voltage values of the users are less than 198V for one hour or more continuously, generating a user low voltage event, newly adding a user low voltage reason field ur _ lowvlot _ replay in a program, setting the default value to be 0.4kV line net rack problem as '9', storing the user low voltage event obtained by calculation into a user low voltage event data table, defining the table name to be ur _ operation _ et, and enabling the fields to comprise fields such as a user number, a user name, a station area number of the user, starting time, ending time, a minimum value, a low voltage reason and the like.
The generation rule and the method of the platform area outlet low-voltage event are as follows: the method comprises the steps that three-phase voltage data collected by a station area collection device and at an outlet of a station area are stored in a user voltage operation table, the table name is defined as pb _ operation _ data, fields comprise a distribution number, collection time, a three-phase voltage value and a three-phase current value, the station area voltage operation table is read in a program according to an analysis period, the minimum value of the three-phase voltage at the outlet of the station area of each collection point is obtained, and a field dt _ minvlot is newly added in the program; if the minimum value of the three-phase voltage of the outlet of the transformer area is less than 198V for one hour or more continuously, generating a transformer area outlet low-voltage event, newly adding an outlet low-voltage reason field dt _ lowvlot _ reason in a program, setting the default value to be 10kV line grid problems, setting the default value to be 6, storing the calculated transformer area low-voltage event into a transformer area low-voltage event data table, defining the table name to be pb _ operation _ et, and storing the fields comprising a transformer area number, a transformer area name, a bus number to which the transformer area belongs, starting time, ending time, a minimum value, a low-voltage reason and other fields.
The bus low-voltage event generation rule and method are as follows: storing three-phase or two-phase bus voltage data acquired by a substation bus voltage acquisition device into a bus voltage operation table, wherein the table name is defined as bs _ operation _ data; taking the minimum value of the three-phase voltage of the 10kV bus of each acquisition point, and setting a field bs _ minvlot in a program; and if the minimum value of the 10kV bus voltage is less than 9.5kV for one hour or more continuously, generating a bus low-voltage event, storing the calculated bus low-voltage event into a bus low-voltage event data table, defining the table name as bs _ operation _ et, and enabling fields to comprise bus numbers, bus names, starting time, ending time, minimum values and other fields.
Fourthly, preliminarily analyzing the reason of low voltage at the outlet of the platform area
(1) When a low-voltage event occurs, if the acquisition point of the zenith area is smaller than 24 points, judging that the acquisition problem of the station area collector is generated, resetting a dt _ lowvlot _ reason field in the low-voltage event at the outlet of the station area to be 0, and indicating that the acquisition problem of the station area collector is generated, otherwise, entering the step (2);
(2) when a low-voltage event occurs, calculating the average value of the three-phase voltage of each acquisition point during the event, judging whether the average minimum value of the three-phase voltage of each acquisition point during the event is greater than 198V, if so, judging that the three-phase of the transformer area is unbalanced, resetting a dt _ lowvlot _ reason field of the low-voltage event at the outlet of the transformer area to be 1, indicating that the three-phase load of the transformer area is unbalanced, and otherwise, entering the step (3);
(3) calculating whether the defect problems of poor contact, phase failure and the like exist when the low-voltage event occurs, wherein the judgment rule is shown in substeps ①, ② and ③, if so, judging that the defect problems of phase failure and poor contact exist in the transformer area, resetting a dt _ lowvlot _ replay field of the low-voltage event at the outlet of the transformer area to be '2', representing the defect problems of phase failure and poor contact of the transformer area, and otherwise, entering the next step;
① if there is a u at a certain collection point within the event occurrence timea+ub-uc|<50V and max (u)a,ub,uc)>198V, the mesa region was judged to be phase loss and defective contact (Yyn0 distribution defect problem is phase C, Dyn11 distribution defect problem is phase A).
② if there is a u at a certain collection point within the event occurrence timea+uc-ub|<50V and max (u)a,ub,uc)>198V, it is determined that the mesa region is open-phase and has poor contact (Yyn0 formula)Metamorphic defect problem is phase B, Dyn11 is assigned metamorphic defect problem is phase C).
③ if there is a u at a certain collection point within the event occurrence timec+ub-ua|<50V and max (u)a,ub,uc)>198V, the mesa region was judged to be phase loss and defective contact (Yyn0 transformation defect problem is phase A, Dyn11 transformation defect problem is phase B).
Wherein: u. ofa、ub、ucThree phase outlet voltage data sequences for the station outlets a, b, c during a low voltage event.
Fifthly, further analyzing the reason of low voltage at the outlet of the platform area
1) Grouping the platform area outlet low-voltage events by day according to the affiliated 10kV lines, searching for outlet low-voltage events with all outlet low-voltage reasons dt _ lowvlot _ reason fields set to be 6, judging whether 10kV bus low-voltage events exist in the outlet low-voltage time, if yes, judging the outlet low-voltage events at the moment as the problem of bus low voltage, resetting the dt _ lowvlot _ reason fields of the platform area outlet low-voltage events at the moment to be 4, and indicating that the cause of the platform area outlet low voltage is caused by the bus low-voltage problem.
2) Grouping the station outlet low-voltage events by 10kV lines by days, searching for all the events of which the low-voltage reasons of the station outlet are phase failure and poor contact defects (the value of dt _ lowvlot _ replay field is '2'), resetting the related station outlet low-voltage event dt _ lowvlot _ replay field to '5' if the low-voltage events of 2 or more stations are judged to be the defects of 10kV line disconnection, poor contact and the like, and indicating that the station outlet low voltage of the related defect problems of line disconnection, poor contact and the like is caused by the line defect problems.
3) Grouping the station outlet low-voltage events by 10kV lines by day, searching all events of distribution transformer outlet low-voltage events which are caused by 10kV line grid frame problems (the value of dt _ lowvlot _ replay field is '6') again, if distribution transformers smaller than 2 exist, judging the related station as the station distribution transformer gear problem, and resetting the related station outlet low-voltage events dt _ lowvlot _ replay field to be '3'.
Sixthly, further user low voltage reason
(1) When a user low-voltage event occurs, if a user acquisition point is smaller than 24 points on the day, determining that the user side ammeter has an acquisition problem, resetting the ur _ lowvlot _ relay field in the platform area outlet low-voltage event to be 7, indicating that the user side ammeter has an acquisition problem, and otherwise, entering the step (2);
(2) grouping the low-voltage events at the user side by station area by day, searching whether a low-voltage event at the outlet of the station area exists in the low-voltage time with the low-voltage event ur _ lowvlot _ replay field of all users as '9', and if so, assigning the low-voltage event dt _ lowvlot _ replay field at the outlet of the station area to the low-voltage event ur _ lowvlot _ replay field of the related user;
(3) grouping the low-voltage events at the user side by station area by day, searching the events of which the low-voltage events are caused by the 0.4kV low-voltage line grid structure problem (the ur _ lowvlot _ relay field value is '9') again, judging the related users as the single-user service line problem if the users are less than 2 users, and resetting the ur _ lowvlot _ relay field of the related users to '8'.
Seventhly, forming a user low voltage reason analysis result
And forming final low-voltage event reasons of all user outlets according to the fourth, fifth and sixth steps, storing the final low-voltage event reasons into a database, performing statistical analysis on all user low-voltage events in a statistical period according to actual needs to obtain 10 types of statistical results such as user ammeter acquisition problems, single-user service line problems, 0.4kV low-voltage line net rack problems, station area collector problems, three-phase imbalance problems, station area defect problems, unreasonable gear problems, 10kV line defect problems, low bus voltage, 10kV line net rack problems and the like, automatically generating low-voltage reasons for each user low-voltage event, and performing low-voltage management work by operation and maintenance personnel in a targeted manner to solve the user low-voltage problems in time.
Eight, example verification
In order to verify the effectiveness of the user low-voltage cause analysis method, taking an example of 2020, 2 months and 1 days of a company in a certain county of a certain province as an example, low-voltage analysis results of some users are listed based on big data analysis results, and the results are as follows:
the result of the user low voltage reason is obtained by calculation based on user voltage data, distribution room operation data and 10kV line bus operation data, and through field verification, the accuracy of the analysis result of the distribution room outlet low voltage reason of the large data technology applied in the embodiment reaches 90%, and the field practical requirement is met.
Claims (8)
1. A user low-voltage cause big data analysis method is characterized in that a user electric meter is used for collecting voltage data of a user side, a platform area electric energy meter collecting device is used for collecting three-phase voltage, current, reactive power and active power electric quantity data of a power supply outlet side, and a transformer substation bus voltage collecting device is used for collecting three-phase or two-phase bus voltage data; respectively generating a user side low voltage event, a platform area outlet low voltage event and a bus low voltage event; the reason of the low-voltage event at the user side at each time is defaulted to be the 0.4kV low-voltage line net rack problem, and the reason of the low-voltage event at the outlet at each time is the 10kV line net rack problem; and automatically analyzing the low voltage reason of each user by a user low voltage cause big data analysis system by utilizing the user side voltage data, the platform area outlet voltage data and the bus voltage data.
2. The method for analyzing big data of user low voltage cause according to claim 1, wherein the rules and method for generating user-side low voltage event are as follows: the method comprises the steps that a user ammeter collects user side voltage data and stores the user side voltage data into a user voltage operation table, the table name is defined as ur _ operation _ data, if the three-phase user three-phase voltage is obtained, the minimum value is obtained by obtaining the minimum value of the user side voltage of each collection point, and the minimum value of the user side voltage of each collection point is obtained; if the single-phase user exists, the user side voltage of each acquisition point is the minimum value, and a field ur _ minvlot is newly added in the program; if the voltage values of the users are less than 198V for one hour or more continuously, generating a user low voltage event, newly adding a user low voltage reason field ur _ lowvlot _ replay in a program, setting the default value to be 0.4kV line net rack problem as '9', storing the user low voltage event obtained by calculation into a user low voltage event data table, defining the table name to be ur _ operation _ et, and enabling the fields to comprise a user number, a user name, a number of a station area to which the user belongs, starting time, ending time, a minimum value and a low voltage reason field.
3. The method for analyzing big data of user low voltage cause according to claim 1, wherein the rules and method for generating the station exit low voltage event are as follows: acquiring three-phase voltage data of an outlet of a transformer area by a transformer area acquisition device, storing the three-phase voltage data into a user voltage operation table, defining the table name as pb _ operation _ data, taking the minimum value of the three-phase voltage of the outlet of the transformer area of each acquisition point, and newly adding a field dt _ minvlot in a program; if the minimum value of the three-phase voltage of the outlet of the transformer area is less than 198V for one hour or more continuously, generating a transformer area outlet low-voltage event, newly adding an outlet low-voltage reason field dt _ lowvlot _ reason in a program, setting the default value to be 10kV line grid problems, setting the default value to be 6, storing the calculated transformer area low-voltage event into a transformer area low-voltage event data table, defining the table name to be pb _ operation _ et, and storing the field to comprise a transformer area number, a transformer area name, a bus number, a starting time, an ending time, a minimum value and a low-voltage reason field.
4. The method for analyzing big data of user low voltage cause according to claim 1, wherein the rule and method for generating bus low voltage event are as follows: storing three-phase or two-phase bus voltage data acquired by a substation bus voltage acquisition device into a bus voltage operation table, wherein the table name is defined as bs _ operation _ data; taking the minimum value of the three-phase voltage of the 10kV bus of each acquisition point, and setting a field bs _ minvlot in a program; and if the minimum value of the 10kV bus voltage is less than 9.5kV for one hour or more continuously, generating a bus low-voltage event, storing the calculated bus low-voltage event into a bus low-voltage event data table, defining the table name as bs _ operation _ et, and enabling fields to comprise a bus number, a bus name, starting time, ending time and a minimum value field.
5. The method for analyzing the big data of the user low voltage cause according to claim 1, wherein the automatic analysis analyzes the reason for the user low voltage on the basis of analyzing the reason for the low voltage at the platform outlet, so as to form an analysis result of the reason for the user low voltage;
the reasons for the low voltage at the outlet of the platform area are analyzed in two steps as follows:
the first analysis step was as follows:
(1) when a low-voltage event occurs, if the collection point of the balcony area is less than 24 points, the problem of collection of the balcony area collector is judged;
(2) when a low-voltage event occurs, calculating the average value of the three-phase voltage of each acquisition point during the event; whether the average minimum value of the three-phase voltage of each acquisition point is greater than 198V or not during the event; if yes, judging the three-phase imbalance problem of the transformer area according to the current low-voltage event reason; otherwise, entering the next step;
(3) if yes, judging the current low-voltage event reason as the problem of the fault of the phase interruption and the poor contact of the transformer area, resetting a dt _ lowvlot _ replay field of the current transformer area outlet low-voltage event to be '2' to represent the problem of the fault of the phase interruption and the poor contact of the transformer area, and otherwise, entering the next step of analysis;
① if there is a u at a certain collection point within the event occurrence timea+ub-uc|<50V, and max (u)a,ub,uc)>198V, the defect of phase loss and poor contact is judged to be the problem of the platform area, namely the problem of Yyn0 transformation defect is C phase, and the problem of Dyn11 transformation defect is C phasePhase A;
② if there is a u at a certain collection point within the event occurrence timea+uc-ub|<50V, and max (u)a,ub,uc)>198V, judging the platform area to be the defect problems of phase failure and poor contact, namely Yyn0 transformation defect problem is B phase, and Dyn11 transformation defect problem is C phase;
③ if there is a u at a certain collection point within the event occurrence timec+ub-ua|<50V, and max (u)a,ub,uc)>198V, judging the platform area to be the phase failure and poor contact defect problem, namely Yyn0 distribution defect problem is phase A, and Dyn11 distribution defect problem is phase B;
wherein: u. ofa、ub、ucThree-phase outlet voltage data sequences of outlets a, b and c of the transformer area during a low-voltage event;
the second step of analysis:
(1) grouping the outlet low-voltage events of the transformer area by day according to the affiliated 10kV lines, and searching outlet low-voltage events of all outlet low-voltage reasons; whether a 10kV bus low-voltage event exists within the outlet low-voltage time or not; if the bus low-voltage event exists, the current outlet low-voltage event is judged to be the bus low-voltage problem, and the dt _ lowvlot _ reason field of the current transformer area outlet low-voltage event is reset to be 4, which indicates that the cause of the transformer area outlet low-voltage event is caused by the bus low-voltage problem;
(2) grouping the low-voltage events at the outlets of the transformer areas by day according to 10kV lines, and searching events of low-voltage reasons of all the outlets of the transformer areas; if 2 or more transformer area low-voltage events exist, judging that the 10kV line has the problems of disconnection and poor contact, and causing the transformer area outlet low voltage indicating the problems of disconnection and poor contact caused by the line defect problem when the transformer area outlet low-voltage event indicates the problems of disconnection and poor contact;
(3) grouping the low-voltage events at the outlets of the transformer area by 10kV lines daily, searching all events of the distribution transformer outlet low-voltage events due to the 10kV line grid structure problem again, and if distribution transformers smaller than 2 are available, judging the related transformer area as the transformer area distribution transformer gear problem.
6. The method for analyzing big data of user low voltage cause according to claim 5, wherein the user low voltage analyzing steps are as follows:
(1) when a user low-voltage event occurs, if the user acquisition point is less than 24 points on the day, determining that the user-side ammeter acquires a problem; otherwise, entering the next step;
(2) grouping the low-voltage events at the user side by the transformer area by day, searching whether a transformer area outlet low-voltage event exists in the low-voltage time of all the low-voltage events of the user, and if so, assigning a transformer area outlet low-voltage reason field to a related user low-voltage event field at the same moment;
(3) and grouping the low-voltage events at the user side by the cell by day, searching for the event of which the low-voltage event cause is the 0.4kV low-voltage line network frame problem of all users again, and if the users are less than 2 users, judging the related users as the single-user service line problem.
7. The method for analyzing the big data of the low voltage cause of the user according to claim 1, wherein the user side voltage data is collected, and the collection interval is generally 15 minutes or 30 minutes; collecting three-phase voltage, current, reactive power and active power electric quantities at the outlet side of the transformer area, wherein the sampling interval is generally 15 minutes or 30 minutes; collecting three-phase or two-phase bus voltage data, wherein the collection interval is generally 15 minutes or 30 minutes; storing the time sequence data to a background database; the system is divided into a user voltage operation table, a platform area operation data table and a bus voltage data table.
8. A user low voltage cause big data analysis system for implementing the user low voltage cause big data analysis method according to claims 1 to 7, which is a computer device comprising a memory, a processor and a computer program stored in the memory and running on the processor, wherein the processor implements the following steps when executing the program:
(1) the method comprises the steps that a user ammeter is used for collecting voltage data of a user side, and the collecting interval is generally 15 minutes or 30 minutes; the method comprises the following steps of collecting three-phase voltage, current, reactive power and active power electrical quantities at the power supply outlet side by using a district electric energy meter collecting device, wherein the sampling interval is generally 15 minutes or 30 minutes; acquiring three-phase or two-phase bus voltage data by using a bus voltage acquisition device of a transformer substation, wherein the acquisition interval is generally 15 minutes or 30 minutes, and storing time sequence data into a background database;
(2) generating a user side low voltage event, a platform area outlet low voltage event and a bus low voltage event for the collected user side voltage data, platform area outlet voltage data and 10kV bus voltage data;
(3) judging a user outlet low voltage generation event, taking the minimum value of the user side voltage of each acquisition point, newly adding a field ur _ minvlot in the program, if the user voltage values are less than 198V for one hour or more continuously, generating a user low voltage event, newly adding a user low voltage reason field ur _ lowvlot _ replay in the program, setting the default value to be 0.4kV line grid problem, and setting the default value to be 9%;
(4) judging a platform area outlet low-voltage generation event, taking the minimum value of outlet three-phase voltage of each acquisition point platform area, newly adding a field dt _ minvlot in a program, if the minimum value of the outlet three-phase voltage of each acquisition point platform area is less than 198V for one hour or more continuously, generating the platform area outlet low-voltage event, newly adding an outlet low-voltage reason field dt _ lowvlot _ reason in the program, setting the default value to be 10kV line grid frame problem to be 6;
(5) judging a 10kV bus outlet low-voltage generation event, taking the minimum value of the 10kV bus three-phase voltage of each acquisition point, setting a field bs _ minvlot in a program, and generating a bus low-voltage event if the 10kV bus voltage minimum values are less than 9.5kV for one hour or more continuously;
(6) preliminary analysis of the cause of low voltage at the outlet of the area
When a low-voltage event occurs, if the acquisition point of the sky table area is smaller than 24 points, the acquisition problem of the table area collector is judged, and the dt _ lowvlot _ reason field in the table area outlet low-voltage event and sequence is reset to be 0, which represents the acquisition problem of the table area collector;
calculating the average value of the three-phase voltage of each acquisition point during an event, judging whether the average minimum value of the three-phase voltage of each acquisition point during the event is greater than 198V, and if so, judging that the three-phase imbalance problem of the transformer area exists;
calculating whether the problems of poor contact and phase failure exist when a low-voltage event occurs;
(7) further analyzing the reason of low voltage at the outlet of the platform area
Grouping the outlet low-voltage events of the transformer area by day according to the affiliated 10kV lines, searching outlet low-voltage events with dt _ lowvlot _ reason fields in all outlet low-voltage reason programs set as 6, and judging whether 10kV bus low-voltage events exist in the outlet low-voltage time;
grouping the platform outlet low-voltage events by 10kV lines by day, searching for all the platform outlet low-voltage reasons due to phase failure and poor contact defects, namely, events with a dt _ lowvlot _ reason field value of 2 in a program, if 2 or more platform outlet low-voltage events exist, judging that the 10kV lines have the problems of line breakage and poor contact defects, resetting the dt _ lowvlot _ reason field in the related platform outlet low-voltage event program to be 5, and indicating that the platform outlet low voltage of the related line breakage and poor contact defects is caused by the line defect problems;
grouping the station area outlet low-voltage events by 10kV lines by day, searching all distribution transformer outlet low-voltage events again because of the 10kV line grid structure problem, namely, the event with the dt _ lowvlot _ reason field value of 6 in the program, if the distribution transformer with less than 2 stations exists, judging the related station area as the station area distribution transformer gear problem, and resetting the dt _ lowvlot _ reason field in the related station area outlet low-voltage event program to be 3;
(8) further analyzing the reason of low voltage of user
When a user low-voltage event occurs, if the user acquisition point is less than 24 points on the day, determining that the user-side ammeter acquires a problem; resetting the ur _ lowvlot _ relay field in the low-voltage event at the outlet of the transformer area to be 7, and indicating the collection problem of the electric meter at the user side; otherwise, entering the next step;
grouping the low-voltage events at the user side by station area by day, searching whether a low-voltage event at the outlet of the station area exists in the low-voltage time with the low-voltage event ur _ lowvlot _ replay field of all users as '9', and if so, assigning the low-voltage event dt _ lowvlot _ replay field at the outlet of the station area to the low-voltage event ur _ lowvlot _ replay field of the related user;
grouping low-voltage events at a user side by station area by day, searching for an event of which the value of the low-voltage event field of all users is 9 because of the 0.4kV low-voltage line grid structure problem ur _ lowvlot _ relay, judging the related user as a single-user service line problem if the user is less than 2 users, and resetting the low-voltage event ur _ lowvlot _ relay field of the related user to be 8;
(9) form the analysis result of the user low voltage reason
And performing statistical analysis on all user low-voltage events in the statistical period to obtain 10 types of statistical results of user ammeter acquisition problems, single-user service line access problems, 0.4kV low-voltage line network frame problems, transformer area acquisition problems, three-phase imbalance problems, transformer area defect problems, unreasonable gear problems, 10kV line defect problems, low bus voltage and 10kV line network frame problems.
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