CN110879335B - Method for evaluating heavy overload condition of power distribution network line - Google Patents
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Abstract
The invention discloses a method for evaluating a heavy overload condition of a power distribution network line, which comprises the following steps: step S1, determining parameter information related to the evaluation; step S2, acquiring basic data information through a management system; step S3, evaluating the heavy overload condition of the power distribution network line; step S4, determining the priority of the heavy overload problem of the power distribution network line; and step S5, evaluating the heavy overload condition of the regional distribution network. By implementing the invention, the overload problem caused by short-time load fluctuation factors and the overload problem existing for a long time and appearing at high frequency are distinguished, and the pertinence of problem solving and processing is improved; the evaluation result of the macroscopic overall level of the regional power grid operation is obtained, and the specified optimization suggestion of the distribution network line heavy overload problem is also obtained, so that the decision reference requirements of decision-making personnel at different levels are met; the problem processing priority order is disclosed, the real operability of the evaluation result is improved, and the evaluation result is convenient to convert.
Description
Technical Field
The invention belongs to the field of power grid evaluation, and relates to a method for evaluating a heavy overload condition of a power distribution network line.
Background
Heavy overloading of a power distribution network line means that the power of the line approaches or exceeds the maximum power allowed by the equipment. Overload operation of a power distribution network line can cause the operation life of related equipment to be reduced, the equipment is damaged, even the equipment is burnt by fire, the safe operation of the power distribution network and the power supply of users are affected, and the influence must be immediately handled.
After the power distribution network line is overloaded, the load is often controlled by adopting a temporary load transfer or peak load shifting mode, and temporary power failure of a user can be caused. Part of the problems of overload of the power distribution network lines can be thoroughly solved only by modifying a power grid or building new lines, and the long duration time has great influence on life.
Aiming at the problem of heavy overload of a power distribution network line, a scientific and efficient evaluation method is needed to be adopted, the problem is judged, found and solved as much as possible in advance or in a seedling stage, adverse effects and solving cost caused by the problem are reduced, and safe and stable operation of a power grid and reliable power supply of a user are guaranteed.
The existing evaluation method also has the following problems:
the heavy overload condition of each line at the maximum load moment of the whole network at the highest load day of the region in each year is used as an analysis object, and the analysis result may have larger deviation with the actual heavy overload of the line due to the difference of characteristic curves of the individual line and the whole load of the region.
And (3) carrying out heavy overload problem evaluation by taking the highest load rate of the line in the period, mainly considering the severity of the heavy overload of the line, but not considering the continuity of the heavy overload problem, and being not beneficial to distinguishing the overload problem caused by short-time load fluctuation factors and the overload problem existing for a long time and occurring at high frequency.
The evaluation result is tabulated or abstract score data of a series of index statistical results, the relation between the evaluation result and the next optimization decision is not reflected, and the constructive suggestion is difficult to provide for the next optimization, transformation, construction and the like of the power distribution network.
Disclosure of Invention
The technical problem to be solved by the embodiment of the invention is to provide a method for evaluating the heavy overload condition of a distribution network line, and solve the problems that the severity and the continuity are not considered and differentiation is not realized when the heavy overload condition of the distribution network line is comprehensively evaluated.
The invention provides a method for evaluating a heavy overload condition of a power distribution network line, which comprises the following steps:
step S1, determining parameter information related to the evaluation;
step S2, acquiring basic data information through a management system;
step S3, evaluating the heavy overload condition of the power distribution network line;
step S4, determining the priority of the heavy overload problem of the power distribution network line;
and step S5, evaluating the heavy overload condition of the regional distribution network.
Further, in step S1, the parameter information related to the evaluation specifically includes:
the line load rate refers to the ratio of the actual value of the line transmission power or current to the rated value;
line load rate, which refers to the ratio of the actual value of the line transmitted power or current to the rated value;
line heavy load alarm load rate betazThe power or current transmitted by the line exceeds a heavy load alarm value;
line overload load factor betagThe upper limit value of the power or current transmitted by the line;
a unit counting period T for further dividing the counting time interval into unit counting time intervals with equal duration;
criterion f for determining the problem of reproducibilitycFor judging the standard of repeatability problem when the heavy load or overload frequency of the power distribution network line exceeds fcThe problem is identified as a repeatability problem.
Further, in step S2, the specific process of acquiring the basic data information is as follows:
step S21, acquiring distribution network line information and affiliated operation and maintenance unit information D (i) from a distribution network graph model management system through a data interface, wherein i represents the ith line;
step S22, obtaining the maximum load rate beta of the line within the statistical time period from the main network energy management system through the data interface according to the line name and the GISIDmax(i) Time of maximum load tmax(i);
Step S23, acquiring the highest load rate information beta of the distribution network line in each unit statistical period in the statistical time period from the main network energy management system through the data interface according to the line name and the GISIDTmax(i, j), wherein j represents the j-th unit statistic period.
Further, in step S3, the specific process of evaluating the heavy overload of the distribution network line is as follows:
step S31, based on the obtained line maximum load rate betamax(i) According to the screening condition that the maximum load rate beta of the line is (i) > betaz, screening out a line set of which the load rate is greater than the overload warning value in the evaluation period, namely a heavy overload line set needing attention or optimization, wherein the specific expression is as follows:
L(i)={Li|βmax(i)>βz,i=1,2,3,...N}
step S32, for the screened heavily overloaded lines, evaluating the overload condition of each line i in each unit cycle j;
step S33, calculating the total overload times S of the distribution network lines in the whole evaluation periodg(i);
Step S34, for the screened heavy overload lines, evaluating the heavy load condition of each line i in each unit cycle j;
step S35, calculating the total reloading times S of the distribution network lines in the whole evaluation periodz(i);
And step S36, summarizing to obtain a heavy overload circuit list and a circuit heavy overload condition.
Further, in step S32, the overload condition of each line i in each unit cycle j is evaluated according to the following formula:
wherein i represents the ith line, j represents the jth unit statistical period, and betaTmax(i, j) is the highest load rate, β, of line i in the j unit statistical periodgIs the overload load rate of the power distribution network line.
Further, in step S33, the total number of overloads of the distribution network line in the whole evaluation period is calculated according to the following formula:
wherein i represents the ith line, j represents the jth unit statistical period, Cg(i, j) is the overload condition of line i in the j unit statistical period, Sg(i) Is the total number of overloads of line i over the entire evaluation period.
Further, in step S34, the overloading condition of each route i in each unit cycle j is evaluated according to the following formula:
wherein i represents the ith line, j represents the jth unit statistical period, and betaTmax(i, j) is the highest load rate, β, of line i in the j unit statistical periodgIs the overload load rate, beta, of the distribution network linezThe heavy load rate of the power distribution network line is disclosed.
Further, in step S35, the total number of reloads of the distribution network line in the whole evaluation period is calculated according to the following formula:
wherein i represents the ith line, j represents the jth unit statistical period, Cz(i, j) is the overloading condition of the line i in the j unit statistical period, Sz(i) Is the total number of reloads of line i over the entire evaluation period.
Further, in step S4, the specific process of determining the priority of the power distribution network line heavy overload problem is as follows:
step S41, obtaining the priority sequence of the distribution network line heavy overload problem according to a severity-repeatability decision matrix, wherein in the severity-repeatability decision matrix, the Y axis represents the maximum load rate of the line, and the X axis represents the heavy load or overload times;
step S42, judging whether the line overload times is 0, if not, adopting the overload times Sg(i) If 0, the number of times of overloading S is adoptedz(i);
Step S43, the heavy overload problem is classified into four categories by the line coordinates being located in different areas:
the class A problem is the overload problem with high load rate and high occurrence frequency, which is the heavy overload problem to be solved first;
the B-type problem, the overload problem with high load rate but low occurrence frequency, is a problem solved firstly by suboptimum;
the class C problem, the heavy load problem with high load rate and high frequency, needs to control the load increase and access of the line;
the class D problem, the heavy load problem with high load rate and high frequency, needs to pay attention to the development trend of the line heavy overload problem.
Further, in step S5, the specific process of evaluating the area distribution network heavy overload includes:
step S51, according to different units, respectively carrying out accumulation calculation on the overload times and the overload times of all circuits administered by each unit to obtain the total times of the overload and the overload of the circuits of the power grid management units in each region;
and step S52, summarizing the results to obtain the evaluation result of the heavy overload condition of the regional distribution network, wherein the evaluation result comprises the total number of the regional line overload for reflecting the severity and the frequency of the regional distribution network line overload, and the total number of the regional line overload for reflecting the severity and the frequency of the regional distribution network line overload.
The embodiment of the invention has the following beneficial effects:
the embodiment of the invention provides a method for evaluating the heavy overload condition of a power distribution network line, which considers the severity of the heavy overload problem of the line and the persistence of the heavy overload problem, is favorable for distinguishing the overload problem caused by short-time load fluctuation factors and the overload problem existing for a long time and appearing at high frequency, and improves the pertinence of problem solution and processing.
The law of the distribution network line heavy overload problem is disclosed from two levels of regions and equipment, the evaluation result of the regional power grid operation macroscopic overall level is obtained, the specified distribution network line heavy overload problem optimization suggestion is also obtained, and the decision reference needs of decision-making personnel at different levels are met.
And a quantitative evaluation result and a decision strategy are provided, the problem processing priority is disclosed, the real operability of the evaluation result is improved, the evaluation result conversion is facilitated, and a constructive suggestion is provided for the optimization, the transformation, the construction and the like of the next power distribution network.
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In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is within the scope of the present invention for those skilled in the art to obtain other drawings based on the drawings without inventive exercise.
Fig. 1 is a schematic main flow chart of an embodiment of a method for evaluating a heavy overload condition of a power distribution network line provided by the present invention.
Fig. 2 is a heavy overload line list and a schematic diagram of a line heavy overload condition of an embodiment of a method for evaluating a power distribution network line heavy overload condition according to the present invention.
Fig. 3 is a schematic diagram of a severity-repeatability decision matrix of an embodiment of the method for evaluating the heavy overload condition of the power distribution network line provided by the present invention.
Fig. 4 is a schematic diagram of a result of evaluating a heavy overload condition of a regional distribution network according to an embodiment of the method for evaluating a heavy overload condition of a distribution network line provided by the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention will be described in further detail with reference to the accompanying drawings.
Fig. 1 is a schematic main flow chart illustrating an embodiment of a method for evaluating a heavy overload condition of a power distribution network line provided by the present invention, where in this embodiment, the method includes the following steps:
step S1, determining parameter information related to the evaluation;
in a specific embodiment, the parameter information related to evaluation specifically includes:
line load factor beta(i)The ratio of the actual value of the power or current transmitted by the line to the rated value;
line heavy load alarm load rate betazThe power or current transmitted by the line exceeds a heavy-load alarm value and needs to be concerned or optimized;
line overload load factor betagThe upper limit value of power or current transmitted by a line needs to be immediately controlled, the overload load rate of the power distribution network line is generally set to 100 percent, and in actual operation, the load rate can be alarmed according to the requirement of reducing user influence and finding and eliminating overload early-stage problems in advance, and the line overloadβgSet to less than 100%, Bg>Bz;
A unit statistical period T, which is used to further divide the statistical period into unit statistical periods with equal duration, and generally determine the unit statistical period according to the variation period of line load increase, aiming to count the occurrence frequency of heavy overload problems and find out repeatability problems; for example, if the unit statistical period T is set to be once a day, the number of times of overload of a certain distribution network line is recorded as 1 increase when an overload condition occurs on the certain distribution network line on a certain day in the statistical period;
criterion f for determining the problem of reproducibilitycFor judging the standard of repeatability problem when the heavy load or overload frequency of the power distribution network line exceeds fcThe problem is identified as a repeatability problem, e.g., setting fcAnd when the number of times is 3, and the heavy load times of the power distribution network line in the statistical time period is equal to or more than 3, the line is considered as having the problem of repeated heavy load.
Step S2, acquiring basic data information through a management system;
in a specific embodiment, the specific process of acquiring the basic data information is as follows:
step S21, acquiring distribution network line information such as line name and GISID and the affiliated operation and maintenance unit information D (i) from the distribution network graph model management system through a data interface, such as a subarea power supply office or a power supply station, wherein i represents the ith line;
step S22, obtaining the maximum load rate beta of the line within the statistical period from the main network Energy Management System (EMS) through the data interface according to the line name and the GISIDmax(i) Time of maximum load tmax(i);
Step S23, obtaining the highest load rate information beta of the distribution network line in each unit statistical period in the statistical time period from the main network Energy Management System (EMS) through the data interface according to the line name and the GISIDTmax(i, j), wherein j represents the j-th unit statistic period.
Step S3, evaluating the heavy overload condition of the power distribution network line;
in a specific embodiment, the specific process of evaluating the heavy overload of the power distribution network line is as follows:
step S31, based on the obtained line maximum load rate betamax(i) According to the maximum load factor beta of the linemax(i) And screening a line set with the load rate larger than the overload warning value in the evaluation period, namely a heavy overload line set needing attention or optimization under the screening condition of more than beta z, wherein the specific expression is as follows:
L(i)={Li|βmax(i)>βz,i=1,2,3,…N}
step S32, for the selected heavily overloaded lines, evaluating the overload condition of each line i in each unit cycle j according to the following formula:
wherein i represents the ith line, j represents the jth unit statistical period, and betaTmax(i, j) is the highest load rate, β, of line i in the j unit statistical periodgIs the overload load rate of the power distribution network line;
step S33, calculating the total overload times S of the distribution network lines in the whole evaluation periodg(i) I.e. the total number of cycles in which overload occurs, is calculated according to the following formula:
wherein i represents the ith line, j represents the jth unit statistical period, Cg(i, j) is the overload condition of line i in the j unit statistical period, Sg(i) Is the total number of overloads of line i over the entire evaluation period;
step S34, for the selected heavily overloaded lines, evaluating the overloading condition of each line i in each unit cycle j according to the following formula:
wherein i represents the ith line, j represents the jth unit statistical period, and betaTmax(i, j) is the highest load rate, β, of line i in the j unit statistical periodgIs the overload load rate, beta, of the distribution network linezIs the power distribution network line heavy load rate;
step S35, calculating the total reloading times S of the distribution network lines in the whole evaluation periodz(i) I.e. the total number of cycles in which a reload occurs, is calculated according to the following formula:
wherein i represents the ith line, j represents the jth unit statistical period, Cz(i, j) is the overloading condition of the line i in the j unit statistical period, Sz(i) Is the total number of reloads of line i over the entire evaluation period;
in step S36, as shown in fig. 2, a heavy overload route list and a route heavy overload condition are obtained.
Step S4, determining the priority of the heavy overload problem of the power distribution network line;
in a specific embodiment, the specific process of determining the priority of the power distribution network line heavy overload problem is as follows:
step S41, as shown in fig. 3, obtaining a priority order of the distribution network line heavy overload problem according to a severity-repeatability decision matrix, in which a Y axis represents a maximum load rate of the line and represents a severity of the heavy overload problem, and an X axis represents a heavy load or overload frequency and represents an occurrence frequency of the heavy overload problem;
in the specific embodiment, the system comprises four lines:
transverse line Y1: y ═ betaz;
Transverse line Y2: y ═ betag;
Vertical line X1: x is 1;
vertical line X2: x ═ fc;
Wherein, betazFor line heavy load alarm load rate, betagFor lines of an electricity distribution networkOverload rate, fcCriteria were identified for repeatability problems.
Step S42, the ordinate is the maximum load rate in the evaluation period, the abscissa is the heavy load or overload frequency, whether the line overload frequency is 0 or not is judged, if not, the overload frequency S is adoptedg(i) If 0, the number of times of overloading S is adoptedz(i);
Step S43, the heavy overload problem is classified into four categories by the line coordinates being located in different areas:
the class A problem is the overload problem with high load rate and high occurrence frequency, which is the heavy overload problem to be solved first;
the problems of type B, the overload problem of high load rate but low occurrence frequency, are the problems solved in the suboptimal, the problems need to be further confirmed to cause the temporary increase of the load rate, and control measures are taken for the relevant variables causing the high load rate;
the problem of C type, the heavy load problem with high load rate but high frequency, shows that the line load of the distribution network is in a high state for a long time, and the line load needs to be controlled to be newly increased and accessed;
the class D problem, the heavy load problem with high load rate and high frequency, needs to pay attention to the development trend of the line heavy overload problem, and takes further measures according to the situation.
And step S5, evaluating the heavy overload condition of the regional distribution network.
In a specific embodiment, the specific process for evaluating the heavy overload of the regional distribution network comprises the following steps:
step S51, according to different units, respectively carrying out accumulation calculation on the overload times and the overload times of all circuits administered by each unit to obtain the total times of the overload and the overload of the circuits of the power grid management units in each region;
specifically, taking the power supply a as an example:
and (4) solving the total overload times of the distribution network lines of the A power supply station, namely screening the lines governed by the A power supply station according to the affiliated units D (i), and carrying out S treatment on each lineg(i) Summing to obtain;
calculating the total heavy load times of the distribution network lines of the A power supply station, namely screening the lines governed by the A power supply station according to the affiliated units D (i), and screening all the linesSz(i) And summing to obtain the final product.
Step S52, as shown in FIG. 4, summarizing the results to obtain the result of evaluating the heavy overload condition of the regional distribution network, including the total number of regional line overload, which is used to reflect the severity and frequency of regional distribution network line overload, and the regional management unit should incline the resource priority processing, and adopt the means to eliminate the overload problem as soon as possible, so as to make the index return to zero; the region line overloading is always used for reflecting the severity and frequency of the region distribution network line overloading, the region management unit pays attention to the lines, and measures are taken through two dimensions of reducing the line overloading rate (reducing the severity of heavy overload) or reducing the heavy overload frequency (reducing the frequency of heavy overload problems), so that the indexes are reduced.
Further details may be had by reference to and in conjunction with the preceding description of the drawings and will not be described in detail herein.
The embodiment of the invention has the following beneficial effects:
the embodiment of the invention provides a method for evaluating the heavy overload condition of a power distribution network line, which considers the severity of the heavy overload problem of the line and the persistence of the heavy overload problem, is favorable for distinguishing the overload problem caused by short-time load fluctuation factors and the overload problem existing for a long time and appearing at high frequency, and improves the pertinence of problem solution and processing.
The law of the distribution network line heavy overload problem is disclosed from two levels of regions and equipment, the evaluation result of the regional power grid operation macroscopic overall level is obtained, the specified distribution network line heavy overload problem optimization suggestion is also obtained, and the decision reference needs of decision-making personnel at different levels are met.
And a quantitative evaluation result and a decision strategy are provided, the problem processing priority is disclosed, the real operability of the evaluation result is improved, the evaluation result conversion is facilitated, and a constructive suggestion is provided for the optimization, the transformation, the construction and the like of the next power distribution network.
While the invention has been described in connection with what is presently considered to be the most practical and preferred embodiment, it is to be understood that the invention is not to be limited to the disclosed embodiment, but on the contrary, is intended to cover various modifications and equivalent arrangements included within the spirit and scope of the appended claims.
Claims (10)
1. A method for evaluating the heavy overload condition of a power distribution network line is characterized by comprising the following steps:
step S1, determining parameter information related to the evaluation;
step S2, acquiring basic data information through a management system;
step S3, evaluating the heavy overload condition of the power distribution network line;
step S4, obtaining the priority sequence of the distribution network line heavy overload problem according to a severity-repeatability decision matrix, wherein in the severity-repeatability decision matrix, the Y axis represents the maximum load rate of the line and shows the severity of the heavy overload problem, and the X axis represents the heavy load or overload times and shows the occurrence frequency of the heavy overload problem; and judging whether the overload times of the line is 0 or not, if not, adopting the overload times Sg(i) If 0, the number of times of overloading S is adoptedz(i) (ii) a Classifying the heavy overload problem according to different areas where the line coordinates are located;
and step S5, evaluating the heavy overload condition of the regional distribution network according to the classification result.
2. The method according to claim 1, wherein in step S1, the parameter information related to the evaluation specifically includes:
line load rate, which refers to the ratio of the actual value of the line transmitted power or current to the rated value;
line heavy load alarm load rate betazThe power or current transmitted by the line exceeds a heavy load alarm value;
line overload load factor betagThe upper limit value of the power or current transmitted by the line;
a unit counting period T for further dividing the counting time interval into unit counting time intervals with equal duration;
criterion f for determining the problem of reproducibilitycFor judging the standard of repeatability problem when the heavy load or overload frequency of the power distribution network line exceeds fcThe problem is identified as a repeatability problem.
3. The method as claimed in claim 2, wherein in step S2, the specific process of obtaining the basic data information is as follows:
step S21, acquiring distribution network line information and affiliated operation and maintenance unit information D (i) from a distribution network graph model management system through a data interface, wherein i represents the ith line;
step S22, obtaining the maximum load rate beta of the line within the statistical time period from the main network energy management system through the data interface according to the line name and the GISIDmax(i) Time of maximum load tmax(i);
Step S23, acquiring the highest load rate information beta of the distribution network line in each unit statistical period in the statistical time period from the main network energy management system through the data interface according to the line name and the GISIDTmax(i, j), wherein j represents the j-th unit statistic period.
4. The method of claim 3, wherein in step S3, the detailed procedure for evaluating the heavy overload of the distribution network line is as follows:
step S31, based on the obtained line maximum load rate betamax(i) According to the maximum load factor beta of the linemax(i) And screening a line set with the load rate larger than the overload warning value in the evaluation period, namely a heavy overload line set needing attention or optimization under the screening condition of more than beta z, wherein the specific expression is as follows:
L(i)={Li|βmax(i)>βz,i=1,2,3,...N};
step S32, for the screened heavily overloaded lines, evaluating the overload condition of each line i in each unit cycle j;
step S33, calculating the total overload times S of the distribution network lines in the whole evaluation periodg(i);
Step S34, for the screened heavy overload lines, evaluating the heavy load condition of each line i in each unit cycle j;
step S35, calculating the total reloading times S of the distribution network lines in the whole evaluation periodz(i);
And step S36, summarizing to obtain a heavy overload circuit list and a circuit heavy overload condition.
5. A method according to claim 4, characterized in that in step S32, the overload condition of each line i in each unit cycle j is evaluated according to the following formula:
wherein i represents the ith line, j represents the jth unit statistic period, and betaTmax(i, j) is the highest load rate, β, of line i in the j unit statistical periodgIs the overload load rate of the power distribution network line.
6. The method of claim 5, wherein in step S33, the total number of overloads of the distribution network line during the whole evaluation period is calculated according to the following formula:
wherein i represents the ith line, j represents the jth unit statistical period, Cg(i, j) is the overload condition of line i in the j unit statistical period, Sg(i) Is the total number of overloads of line i over the entire evaluation period.
7. The method of claim 6, wherein in step S34, the overloading condition of each route i in each unit cycle j is evaluated according to the following formula:
wherein i represents the ith line, j represents the jth unit statistical period, and betaTmax(i, j) is the system of line i in the j-th unitMaximum load factor, beta, in the counting periodgIs the overload load rate, beta, of the distribution network linezThe heavy load rate of the power distribution network line is disclosed.
8. The method of claim 7, wherein in step S35, the total number of reloads of the distribution network line during the whole evaluation period is calculated according to the following formula:
wherein i represents the ith line, j represents the jth unit statistical period, Cz(i, j) is the overloading condition of the line i in the j unit statistical period, Sz(i) Is the total number of reloads of line i over the entire evaluation period.
9. The method of claim 8, wherein in step S4, classifying the heavy overload problem according to the different areas where the line coordinates are located specifically comprises:
the class A problem is the overload problem with high load rate and high occurrence frequency, which is the heavy overload problem to be solved first;
the B-type problem, the overload problem with high load rate but low occurrence frequency, is a problem to be solved in the suboptimum state;
the class C problem, the heavy load problem with high load rate and high frequency, needs to control the new load and access of the line;
the class D problem, the heavy load problem with high load rate and high frequency, needs to pay attention to the development trend of the line heavy overload problem.
10. The method of claim 9, wherein in step S5, the specific process of evaluating the heavy overload of the regional distribution network is:
step S51, according to different units, respectively carrying out accumulation calculation on the overload times and the overload times of all circuits administered by each unit to obtain the total times of the overload and the overload of the circuits of the power grid management units in each region;
and step S52, summarizing the results to obtain the evaluation result of the heavy overload condition of the regional distribution network, wherein the evaluation result comprises the total number of the regional line overload for reflecting the severity and the frequency of the regional distribution network line overload, and the total number of the regional line overload for reflecting the severity and the frequency of the regional distribution network line overload.
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