CN111598380A - Distribution line negative loss reason distinguishing method - Google Patents
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Abstract
A distribution line negative loss reason distinguishing method accurately distinguishes the line negative loss reason by acquiring multi-party information of line electricity supply and sale, gateway multiplying power and distribution transformer electricity and combining a corresponding analysis algorithm of line long-term continuous negative loss, repeated negative loss of the line and sudden negative loss of the line. The attached figure is a process for judging the reasons of the line burst negative loss state. The method for judging the negative loss reason of the distribution line can solve the problems of difficulty in troubleshooting and low speed in troubleshooting of the negative loss reason of the 10kV distribution line to a certain extent, can improve the abnormal line troubleshooting efficiency, guides operation and maintenance personnel of an electric power system to conduct targeted rectification and elimination, and has important significance for comprehensively improving the quality of basic data and troubleshooting the stock problem of the system.
Description
Technical Field
The invention relates to a method for judging negative loss reasons of a distribution line, belonging to the technical field of power grids.
Background
At present, a power system adopts a 'quartering' management method for distribution network loss, namely, the loss in the electric energy transmission process is accurately evaluated according to four-dimensional calculation of branching, partitioning, voltage division and distribution area, and the branching line loss of a 10kV distribution line gradually becomes one of important indexes for distribution network operation and maintenance at present. However, due to the problems of complex power distribution network lines, inaccurate basic information and standing accounts, frequent failure of the power acquisition equipment and the like, the lines often have negative loss, so that the negative loss of the power distribution lines is eliminated, and the improvement of the branch line loss index is of great significance to lean management of the power system.
At present, a power system checks basic machine account problems by combing negative loss lines, analysis and management of line negative loss reasons are mainly concentrated under the online condition, negative losses of distribution lines are found through abnormal values of electricity supply and sales, no complete and reliable method is provided for studying and judging the specific negative loss reasons, the distribution line is complex in structure and multiple in line parameter interference factors, the checking process is long in time consumption, the negative loss management workload is large, and the efficiency is low.
Disclosure of Invention
The invention aims to solve the problems of difficulty in troubleshooting and low management speed of negative loss line reasons of a 10kV distribution line, and provides a method for judging the negative loss reason of the distribution line in order to improve the line abnormity management efficiency and guide operation and maintenance personnel of an electric power system to pertinently correct, correct and eliminate defects.
According to the technical scheme, the method for judging the negative loss reason of the distribution line accurately judges the reason of the negative loss of the line by acquiring multi-party information of the electricity supply and sale quantity, the gateway multiplying power and the distribution transformer electricity quantity of the line and combining a corresponding analysis algorithm of the long-term continuous negative loss, the repeated negative loss of the line and the sudden negative loss state of the line.
The long-term continuous negative loss refers to a curve graph of nearly 20 antenna loss rates, and the antenna loss rate is below-1% per day; the repeated negative loss of the line means that the line loss rate curve chart is close to 20, and the line loss is normal and the negative loss alternately appears twice or more; the line burst negative loss refers to a curve graph of the antenna loss rate of nearly 20, and the line loss rate changes from normal to negative loss only once.
The multi-party information of the line power supply and sale, the gateway multiplying power and the distribution transformer power is acquired by the following steps:
the power supply amount details of the negative loss line in about 20 days comprise the power supply amount configuration details: the power consumption of the line gateway, the name and the power supply quantity of the distributed power supply and the multiplying power of a power distribution line gateway table;
the electricity selling quantity of the line is detailed in 20 days, and comprises the name, the electricity quantity and the transformation ratio information of all public transformers and special transformers which are connected under the line, and the electricity selling quantity of the distributed power supply; and drawing an electric quantity curve and a line loss rate curve according to the electric quantity for sale.
The method comprises the following steps of:
(1) observing the power curve diagram in the intelligent circuit billboard, judging whether the power supply and sale of the circuit are consistent, and taking the power supply data of the 20-antenna circuit as a sequence of { X }iUsing the electricity selling data as a series of numbers YiCalculating average values of power supply quantity and electricity sales quantity respectively
And then calculating a Pearson correlation coefficient of the electricity supply sale quantity:
when the Pearson correlation coefficient rho of the electricity supply and sale quantity is larger than or equal to 0.9, judging that the electricity supply and sale quantity of the line is consistent in change; preliminarily judging that the line negative loss reason is line variable relation error, checking the acquired public and special variable list under the distribution line with a basic ledger of a power supply station, and necessarily comparing with the actual situation on site for further confirmation;
(2) if the Pearson correlation coefficient rho is less than 0.9, no obvious relation exists between the electricity supply and the electricity sale; continuously checking whether the configuration of the line distributed power supply is complete or not, and judging by checking reverse electric quantity in the line electric quantity sold; if the distributed power supply is connected under the distribution line, the bottom of the power supply reverse meter should record electric quantity, which indicates that the distributed power supply has input electric quantity to the line; checking the line power supply amount detail to determine whether negative loss is caused by that reverse power amount of the distributed power supply is not included in the line power supply amount due to non-configuration or error configuration of the distributed power supply;
(3) if the distributed power supply does not exist under the line, the problem of line gateway metering is preliminarily judged, and the situation that the power supply amount is reduced due to the fact that gateway metering is out of phase and the like may occur.
The method comprises the following steps of:
(1) observing a power supply and sale curve chart of the line, judging whether the power supply amount is obviously reduced or not, and taking the reduction amplitude exceeding 20% as a basis; if the line power supply quantity is obviously reduced, the problem is positioned to the error of the line power supply quantity; checking whether the electric quantity of the line gateway meter is lost or not, and if so, determining the problem as a line gateway acquisition fault; continuously checking whether the configuration of the line distributed power supply is complete or not; if the configuration is complete and no electric quantity exists, the negative loss reason is the electric quantity acquisition fault of the distributed power supply; if the configuration is incomplete, the problem is that the distributed power supply is not configured, so that the reverse electric quantity of the distributed power supply is not brought into the line power supply quantity, and negative loss is caused;
(2) checking whether the power supply curve has dislocation phenomenon under the condition that the input power is normal, and calculating 20 the power supply data { X) of the antenna circuit in the step (1) similar to the situation that the circuit has long-term continuous negative lossiData of electricity sales { Y }iPearson's correlation coefficient ρ0(ii) a Then the data of the power supply amount is adjusted forward one day, and the corresponding relation is from the original (X)i,Yi) (i ═ 1,2.. 20), adjusted to (X)i+1,Yi) (i ═ 1,2.. 19), the pearson correlation coefficient for the 19 sets of data was calculated and recorded as ρ1(ii) a If both satisfy rho0< 0.9 and ρ1If the power supply quantity curve is not less than 0.9, judging that the power supply quantity curve has a dislocation phenomenon, and determining the problem as a gateway meter clock error, namely that the power quantity collected by a line gateway is the power quantity of the previous day and does not have a corresponding relation with the power supply quantity of the line, so that the line outlet is repeatedly negatively damaged;
(3) if the power supply and sales curve does not have a dislocation phenomenon and the situation that the gateway multiplying power is large (more than 20000) and the power sales is small (generally less than 2000kWh or one-tenth of the line multiplying power) occurs, the situation that the repeated negative loss is caused by the situation that the metering accuracy of the gateway meter is insufficient is preliminarily judged;
(4) if the voltage does not appear, continuously checking whether a special transformer is supplied with power by the double power supplies or not under the line; if yes, the private transformer is judged to be caused by repeatedly changing the main supply line, and if not, the public-private transformer ratio is preliminarily judged to be wrong.
The line burst negative loss reason judging step is as follows:
(1) observing a line power supply and sale curve graph, and judging whether the line power supply is obviously reduced or not according to the condition that the reduction amplitude exceeds 20%; if the input electric quantity is obviously reduced, checking whether the electric quantity of the line gateway is zero, and if the electric quantity of the line gateway is zero, judging that the line gateway has a collection fault; if the electric quantity of the gateway of the line transformer substation is not in a problem, checking whether a distributed power supply is connected below the line; if no distributed power supply is preliminarily judged to be temporarily unloaded, after the temporary line load is changed, the GIS and PMS system modeling and maintenance online work cannot follow up in time; if a distributed power supply exists under the line, whether the synchronous electric quantity of the power supply is abnormal or not needs to be checked, 20% of the average value of the electric quantity in about 20 days is calculated as a criterion, and if the average value of the electric quantity does not exceed the criterion, the reason of the negative loss is judged to be temporary load shedding; if the electric quantity of the distributed power supply is zero, judging that the distributed power supply has a collection fault;
(2) if the input electric quantity of the line is not obviously reduced, the sudden negative loss reason of the line appears at the electricity selling end; checking the detail of all public and private electric quantities under the line, drawing a distribution transformer electric quantity curve chart before and after the line generates negative loss by combining the distribution transformer synchronous electric quantity, and observing whether an electric quantity abnormal value exists; similarly, judging that the problem of code hopping at the bottom of the distribution transformer table occurs by taking 20% of the average value of the electricity sold for 20 days after exceeding the distribution transformer as a criterion; if the problem does not exist, the situation that the newly added distributed power supply is not configured in the system possibly exists under the line is judged.
The line loss rate is: line loss rate (power supply amount-electricity sales amount)/power supply amount 100%;
when the line loss rate is less than-1%, the line loss is called negative loss.
The method for judging the negative loss reason of the distribution line has the advantages that the problems that the negative loss reason of the 10kV distribution line is difficult to find and is low in treatment speed can be solved to a certain extent, the abnormal treatment efficiency of the line can be improved, operation and maintenance personnel of an electric power system can be guided to conduct targeted rectification and elimination, and the method is of great significance for comprehensively improving the quality of basic data and checking the stock of a system.
Drawings
FIG. 1 is a flow of determining the cause of long-term sustained negative loss of a line;
FIG. 2 is a flow of determining the reason for repeated negative loss of the line;
FIG. 3 is a process of determining the cause of sudden negative loss of a line;
FIG. 4 is a graph of the power supply of the present embodiment;
FIG. 5 is a line loss rate curve of example Nos. 11.7 to 26;
fig. 6 is a line loss rate curve of example nos. 11.7 to 24.
Detailed Description
The negative loss of the distribution line includes a long-term continuous negative loss, a repeated negative loss and an abrupt negative loss, and the flow of determining the negative loss cause is shown in fig. 1, fig. 2 and fig. 3.
The invention will now be further explained by taking a 10kV line of a 35kV substation of a certain company as an example.
A10 kV crystal line of a 35kV field pond transformer substation of a certain company in a certain city discovers sudden negative loss from 11 and 26 days in 2019, the line loss rate of the 11 and 26 days in 11 months is-106.26%, the power supply capacity is 7820kWh, the power selling capacity is 16170.6kWh, and the power loss is-6112.7 kWh.
According to the method, the power supply and sale amount of the crystal line in about 20 days, the power supply and sale amount, the power supply configuration details (the line gateway power amount, the name of a distributed power supply and the power supply amount) and the multiplying power of the distribution line gateway table are obtained from an integrated power and line loss management system, wherein the power supply and sale amount is shown in a table 1, and the multiplying power of the distribution line gateway table is shown in a table 2. And acquiring the electricity selling quantity detail of the line in 20 days, including the names, the electric quantity, the transformation ratio information and the like of all the public transformers and the special transformers which are connected under the line. Fig. 4 to 6 are graphs showing power curves and line loss rates according to the power supply.
TABLE 1 Crystal line nearly 20 days for electricity sales
TABLE 2 line power allocation and rate
Since the line loss rate values from 11 months 7 to 24 are small, the remaining data are plotted in fig. 6 by eliminating the line loss rates of 25 and 26 days.
According to the requirement of the method, the line loss rate is subjected to negative loss in the period from No. 7 to No. 24 according to the data and the curve chart of the near 20 antenna loss rate, and the line loss rate is changed from normal to negative loss only in the period from No. 25 (the line loss rate is below-1%), so that the line is divided into the sudden negative loss lines. The invention relates to a line sudden negative loss condition and a reason judging process under the sudden negative loss condition, which observes a line power supply and sale curve graph and judges whether the line power supply is obviously reduced. When the number 25 of the line is negatively damaged, the power supply quantity reduction range is (20160-7520)/20160 100% -62.7%, if the power supply quantity is more than 20%, the power supply quantity is judged to be obviously reduced, but the power quantity of the line gateway is not reduced to zero, and the line gateway acquisition fault can be preliminarily eliminated. Then, the gate configuration of the crystal line is checked, and it can be known from table 2 that the distributed power supply is not connected under the line, and it can be determined that there is no problem in the input power. Therefore, according to the sudden load loss reason judging process, the reason can be positioned to temporary load shedding.
After the line load loss reason is judged to be the temporary load shedding reason according to the method, the line operation and maintenance personnel enter the dispatching OMS system to check whether the operation mode of the 10kV crystal line changes recently.
The on-duty analysis report of the scheduling log of 11 months and 25 days shows that: after the 10kV crystal line #43 pole is powered on by the 10kV peak-sense line after 11 months, 25 days, the reason that the sudden negative loss of the crystal line is really temporary load reversal can be confirmed. The method for judging the negative loss reason of the distribution line can quickly and accurately judge the negative loss reason of the line.
Claims (7)
1. A distribution line negative loss reason distinguishing method is characterized in that the method accurately distinguishes the reason of line negative loss by acquiring multi-party information of line electricity supply and sale, gateway multiplying power and distribution transformer electricity and combining three state corresponding analysis algorithms of line continuous negative loss, repeated negative loss of the line and sudden negative loss of the line.
2. The method for determining the cause of negative loss of the distribution line according to claim 1, wherein the step of determining the cause of long-term sustained negative loss of the line comprises:
(1) observing the power curve diagram in the intelligent circuit billboard, judging whether the power supply and sale of the circuit are consistent, and taking the power supply data of the 20-antenna circuit as a sequence of { X }iUsing the electricity selling data as a series of numbers YiCalculating average values of power supply quantity and electricity sales quantity respectively
And then calculating a Pearson correlation coefficient of the electricity supply sale quantity:
when the Pearson correlation coefficient rho of the electricity supply and sale quantity is larger than or equal to 0.9, judging that the electricity supply and sale quantity of the line is consistent in change; preliminarily judging that the line negative loss reason is line variable relation error, checking the acquired public and special variable list under the distribution line with a basic ledger of a power supply station, and necessarily comparing with the actual situation on site for further confirmation;
(2) if the Pearson correlation coefficient rho is less than 0.9, no obvious relation exists between the electricity supply and the electricity sale; continuously checking whether the configuration of the line distributed power supply is complete or not, and judging by checking reverse electric quantity in the line electric quantity sold; if the distributed power supply is connected under the distribution line, the bottom of the power supply reverse meter should record electric quantity, which indicates that the distributed power supply has input electric quantity to the line; checking the line power supply amount detail to determine whether negative loss is caused by that reverse power amount of the distributed power supply is not included in the line power supply amount due to non-configuration or error configuration of the distributed power supply;
(3) if the distributed power supply does not exist under the line, the problem of line gateway metering is preliminarily judged, and the situation that the power supply amount is reduced due to the fact that gateway metering is out of phase and the like can occur.
3. The method of claim 1, wherein the step of determining the cause of negative loss repeatedly occurs on the line comprises:
(1) observing a power supply and sale curve chart of the line, judging whether the power supply amount is obviously reduced or not, and taking the reduction amplitude exceeding 20% as a basis; if the line power supply quantity is obviously reduced, the problem is positioned to the error of the line power supply quantity; checking whether the electric quantity of the line gateway meter is lost or not, and if so, determining the problem as a line gateway acquisition fault; continuously checking whether the configuration of the line distributed power supply is complete or not; if the configuration is complete and no electric quantity exists, the negative loss reason is the electric quantity acquisition fault of the distributed power supply; if the configuration is incomplete, the problem is that the distributed power supply is not configured, so that the reverse electric quantity of the distributed power supply is not brought into the line power supply quantity, and negative loss is caused;
(2) checking whether the power supply curve has dislocation phenomenon under the condition of normal input power, calculating 20 antenna circuit power supply data { X }iData of electricity sales { Y }iPearson's correlation coefficient ρ0(ii) a Then the data of the power supply amount is adjusted forward one day, and the corresponding relation is from the original (X)i,Yi) (i ═ 1,2.. 20), adjusted to (X)i+1,Yi) (i ═ 1,2.. 19), the pearson correlation coefficient for the 19 sets of data was calculated and recorded as ρ1(ii) a If both are fullFoot rho0< 0.9 and ρ1If the power supply quantity curve is not less than 0.9, judging that the power supply quantity curve has a dislocation phenomenon, and determining the problem as a gateway meter clock error, namely that the power quantity acquired by a line gateway is the power quantity of the previous day and does not have a corresponding relation with the power supply quantity of the line, so that the line outlet is repeatedly negatively damaged;
(3) if the power supply and sales curve is not dislocated, and the gateway multiplying power is large and the power sales is small, the situation that repeated negative loss is caused by the situation that the metering precision of the gateway meter is insufficient is preliminarily judged;
(4) if the voltage does not appear, continuously checking whether a special transformer is supplied with power by the double power supplies or not under the line; if yes, the private transformer is judged to be caused by repeatedly changing the main supply line, and if not, the public-private transformer ratio is preliminarily judged to be wrong.
4. The method for determining the cause of negative loss of the distribution line according to claim 1, wherein the step of determining the cause of negative loss of the line burst is as follows:
(1) observing a line power supply and sale curve graph, and judging whether the line power supply is obviously reduced or not according to the condition that the reduction amplitude exceeds 20%; if the input electric quantity is obviously reduced, checking whether the electric quantity of the line gateway is zero, and if the electric quantity of the line gateway is zero, judging that the line gateway has a collection fault; if the electric quantity of the gateway of the line transformer substation is not in a problem, checking whether a distributed power supply is connected below the line; if no distributed power supply is preliminarily judged to be temporarily unloaded, after the temporary line load is changed, the GIS and PMS system modeling and maintenance online work cannot follow up in time; if a distributed power supply exists under the line, whether the synchronous electric quantity of the power supply is abnormal or not needs to be checked, 20% of the average value of the electric quantity in about 20 days is calculated as a criterion, and if the average value of the electric quantity does not exceed the criterion, the reason of the negative loss is judged to be temporary load shedding; if the electric quantity of the distributed power supply is zero, judging that the distributed power supply has a collection fault;
(2) if the input electric quantity of the line is not obviously reduced, the sudden negative loss reason of the line appears at the electricity selling end; checking the detail of all public and private electric quantities under the line, drawing a distribution transformer electric quantity curve chart before and after the line generates negative loss by combining the distribution transformer synchronous electric quantity, and observing whether an electric quantity abnormal value exists; similarly, judging that the problem of code hopping at the bottom of the distribution transformer table occurs by taking 20% of the average value of the electricity sold for 20 days after exceeding the distribution transformer as a criterion; if the problem does not exist, the fact that the newly-added distributed power supply is not configured in the system exists under the line is judged.
5. The method of claim 1, wherein the multi-party information comprises:
the power supply amount details of the negative loss line in about 20 days comprise the power supply amount configuration details: the power consumption of the line gateway, the name and the power supply quantity of the distributed power supply and the multiplying power of a power distribution line gateway table;
the electricity selling quantity of the line is detailed in 20 days, and comprises the name, the electricity quantity and the transformation ratio information of all public transformers and special transformers which are connected under the line, and the electricity selling quantity of the distributed power supply;
and drawing an electric quantity curve and a line loss rate curve according to the electric quantity for sale.
6. The method for determining the cause of the negative loss of the distribution line according to claim 1, wherein the long-term sustained negative loss is shown in a graph of an antenna loss rate close to 20, and the antenna loss rate is below-1% per day; the repeated negative loss of the line means that the line loss rate curve chart is close to 20, and the line loss is normal and the negative loss alternately appears twice or more; the line burst negative loss refers to a curve graph of the antenna loss rate of nearly 20, and the line loss rate changes from normal to negative loss only once.
7. The method of claim 5, wherein the line loss rate is: line loss rate (power supply amount-electricity sales amount)/power supply amount 100%;
when the line loss rate is less than-1%, the line loss is called negative loss.
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| CN112785152A (en) * | 2021-01-22 | 2021-05-11 | 国网山东省电力公司德州市陵城区供电公司 | Distribution line loss analysis method based on integrated electric quantity and line loss management system |
| CN113469486A (en) * | 2021-04-19 | 2021-10-01 | 国网河北省电力有限公司电力科学研究院 | Line negative loss and high loss analysis method |
| CN113487447A (en) * | 2021-04-19 | 2021-10-08 | 国网河北省电力有限公司电力科学研究院 | Power distribution network load prediction and line loss cause analysis method based on big data |
| CN114994453A (en) * | 2022-05-10 | 2022-09-02 | 国网江西省电力有限公司电力科学研究院 | Method for studying and judging abnormal line loss reasons of multi-dimensional characteristics of distribution line |
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