CN104616125A - Calculation method for analyzing influence of grounding mode on power distribution network power supplying reliability - Google Patents
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Abstract
The invention discloses a calculation method for analyzing influence of grounding mode on power distribution network power supplying reliability, and belongs to the field of power distribution network power supplying reliability analysis in an electric power system. The calculation method is characterized by comprising the following steps: (1) conducting statistics on correlation data of single-phase grounding fault conditions of all grounding modes; analyzing the factors influencing power supplying reliability; (2) building a mathematical model of all the evaluation indexes of power supplying reliability; calculating all the evaluation indexes of power supplying reliability; (3) calculating the scores of the power supplying reliability indexes of the grounding modes; confirming the weight of the indexes; (4) calculating the power supplying reliability scores of the grounding modes according to the power supplying reliability scoring model; (5) comparing and confirming the grounding modes with relatively excellent reliability. The calculation method comprehensively considers all the evaluation indexes of power supplying reliability, is suitable for pole line and cable pipeline power distribution networks at the same time, and is relatively comprehensive in analysis, and relatively accurate in calculation result.
Description
Technical Field
A calculation method for analyzing the influence of a grounding mode on the power supply reliability of a power distribution network belongs to the field of power supply reliability analysis of the power distribution network of a power system.
Background
The distribution network power supply reliability is a measure of the power supply capacity of a power grid for continuously supplying power to customers in a certain statistical period, and is an important index of the power supply service quality. With the development of economic society, the improvement of the living standard of people and the wide popularization of electric appliances, the requirement of users on the power supply reliability of a power system is higher and higher. The neutral grounding mode is closely related to the power supply reliability. At present, the influence of a neutral point grounding mode on the power supply reliability mainly stays on qualitative analysis and field operation experience, and quantitative analysis and calculation are lacked.
In the literature, "decision method research of neutral point grounding mode of medium-voltage distribution network" about the influence of the neutral point grounding mode on power supply reliability, only a line trip rate (sum of short-time power failure trip and long-time power failure trip) model under different grounding modes is established, and the completely different influence of the short-time power failure trip and the long-time power failure trip is ignored. Furthermore, the reliability of the power supply cannot be evaluated by the trip rate alone. The literature, namely 'influence of a neutral point grounding mode on the reliability of a power distribution network', mainly aims at a cable line power distribution network, only a trip rate model is established, and the selected power supply reliability evaluation index is expected power supply shortage. The literature, "comprehensive selection method of medium-voltage power grid grounding mode" is to comprehensively consider factors such as power supply reliability, personal safety, equipment safety, insulation level, overvoltage, relay protection, communication interference, system development planning and the like, and give corresponding weights to the factors respectively to perform comparative selection of grounding modes, and how to perform detailed analysis and modeling on power supply reliability of a local mode is not performed.
Disclosure of Invention
The technical problem to be solved by the invention is as follows: the method overcomes the defects of the prior art, provides a calculation method for analyzing the influence of the grounding mode on the power supply reliability of the power distribution network, which comprehensively considers various evaluation indexes of the power supply reliability and is simultaneously suitable for the power distribution network of overhead lines and cable lines.
The technical scheme adopted by the invention for solving the technical problems is as follows: the calculation method for analyzing the influence of the grounding mode on the power supply reliability of the power distribution network is characterized by comprising the following steps of: the method comprises the following steps:
step a, counting relevant data of single-phase earth fault conditions of each grounding mode, and analyzing factors influencing power supply reliability;
step b, calculating each evaluation index of power supply reliability;
calculating each evaluation index of the power supply reliability according to the mathematical model of each evaluation index of the power supply reliability;
step c, calculating power supply reliability index scores under each grounding mode and determining the weight of each index;
calculating the score of each power supply reliability index according to a power supply reliability index score formula, and determining the weight of each power supply reliability index;
step d, calculating power supply reliability scores in different grounding modes;
calculating power supply reliability scores in different grounding modes according to a power supply reliability scoring model formula;
step e, comparing and determining a grounding mode with better reliability;
comparing the calculated power supply reliability scores of the grounding modes, the grounding mode with the smaller power supply reliability score has better power supply reliability.
Preferably, the mathematical model of each evaluation index of power supply reliability in step b includes a mathematical model of a power supply reliability evaluation index including an average number of long-term power outages per year of the user, an average long-term power outages per year of the user, and an average number of short-term power outages per year of the user.
Preferably, it is characterized in that:
the mathematical model of the average long-term power failure times of the user per year is as follows:
the mathematical model of the average long-term power failure time of the user per year is as follows:
the mathematical model of the average annual short-time power failure times of the user is as follows:
wherein:as a lineLength of (d);the total number of evenly distributed users on the line;single-phase earth fault rate;is the rate of permanent single-phase earth faults;the permanent fault online repair rate is obtained;mean time to failure for a single fault;the average number of the users with power failure in a single fault is;、are respectively a lineThe probability of power failure of other lines caused by the extension of single-phase earth fault overvoltage accidents and fire accidents;
wherein, when the low resistance grounding mode does not allow reclosing to be switched in,，，，(ii) a When the low resistance grounding mode allows the reclosing switch to be switched in,，，，(ii) a When the automatic line selection device selects the line in the resonance grounding mode,，，，(ii) a When the line selection is realized by manually pulling the resonant grounding mode, average trial pull is setThe strip line can complete one-time line selection at the moment，，，。
Preferably, the power supply reliability index score formulas in step c are respectively:
（）
wherein,in a manner of groundingThe average long-term power failure times of the users per year are scored;in a manner of groundingAverage long-term power failure times of users;for being comparedAverage long-term power failure times of users in the grounding mode,is a constant between (0, 100 m);
（）
wherein,in a manner of groundingThe average long-term power failure time of the user is scored;in a manner of groundingAverage long-term power failure time of the user;for being comparedAverage long-term power failure time of a user in a grounding mode,is a constant between (0, 100 m);
（）
wherein,in a manner of groundingThe average annual short-time power failure times of the users are scored;in a manner of groundingAverage number of short-term power failure times per year for the user;for being comparedAverage annual average short-time power failure times of users in the grounding mode,is a constant between (0, 100 m).
Preferably, the power supply reliability scoring model formula in step d is:
wherein:、、respectively scoring the average long-term power failure times of the user, the average long-term power failure time of the user and the average long-term power failure times of the user in each power supply reliability index score in the step c;、、and c, respectively weighting the average long-term power failure times of the user per year, the average long-term power failure time of the user per year and the average short-term power failure times of the user per year corresponding to the weight of each power supply reliability index in the step c.
Compared with the prior art, the invention has the beneficial effects that:
the calculation method for analyzing the influence of the grounding mode on the power supply reliability of the power distribution network establishes a mathematical calculation model which can be simultaneously suitable for the power distribution network of the overhead line and the cable line and reflects the influence of the grounding mode on the power supply reliability, and establishes a mathematical model for comparing the power supply reliability of the grounding mode by comprehensively considering various evaluation indexes of the power supply reliability. The method realizes quantitative calculation and comparison of the influence of the grounding mode on the power supply reliability, is relatively comprehensive in consideration, and relatively accurate in calculation result. In the aspect of power supply reliability, more effective data support can be provided for the selection of the grounding mode of the power distribution network.
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Fig. 1 is a flowchart of a calculation method for analyzing an influence of a grounding mode on power supply reliability of a power distribution network.
Detailed Description
Fig. 1 shows a preferred embodiment of the present invention, which is further described below with reference to fig. 1.
As shown in fig. 1, a calculation method for analyzing an influence of a grounding mode on power supply reliability of a power distribution network includes the following steps:
step a, counting relevant data of single-phase earth fault conditions of each grounding mode, and analyzing factors influencing power supply reliability;
and analyzing factors influencing the power supply reliability of the grounding mode of the neutral point according to the one-way grounding fault condition of each grounding mode. The influence of the neutral point grounding mode on the power supply reliability is mainly reflected in the influence on long-time power failure and short-time power failure during single-phase grounding fault. LineThe reason why the single-phase earth fault causes the long-term power failure is mainly two: linePower cut and lineThe single-phase earth fault extends to cause other lines to be powered off. Wherein the fault propagation includes an overvoltage event propagation and an arc fire event propagation. Under different grounding modes, the times of long-time power failure and the power failure time are different.
The influence of the grounding mode on the short-time power failure is mainly reflected in the number of short-time power failure times. Further analysis is made of the main factors of single-phase earth fault rate (the number of single-phase earth faults occurring every kilometer of lines and equipment every year), the ratio of instantaneous and permanent single-phase earth faults, the probability of power failure of other lines caused by single-phase earth fault expansion, the number of short-time power failure, the number of long-time power failure, the time length and the like.
B, calculating each evaluation index of the power supply reliability according to the mathematical model of each evaluation index of the power supply reliability;
with a certain outlet of the substationFor the object of study, setting up a circuitHas a length ofThe average total number of distributed users is(ii) a Having a single-phase earth fault rate ofWherein the ratio of permanent single-phase earth faults is(ii) a The permanent fault on-line repair rate is(ii) a Mean time to failure for a single fault of(ii) a Average number of users with single fault(ii) a Line arrangementThe probabilities of power failure of other lines caused by single-phase earth fault overvoltage accident and fire accident expansion are respectively、. The above will correspond to different values under different grounding modes, and establish the mathematical model of each index of the power supply reliability according to the above values:
average long-term power failure times of users:
average long-term power failure time of a user:
average number of power failures in short time per year for users:
wherein, when the low resistance grounding mode does not allow reclosing to be switched in,，，，(ii) a When the low resistance grounding mode allows the reclosing switch to be switched in,，，，(ii) a When the automatic line selection device selects the line in the resonance grounding mode,，，，(ii) a When the line selection is realized by manually pulling the resonant grounding mode, average trial pull is setThe strip line can complete one-time line selection at the moment，，，。
And after the establishment of the mathematical model of each index of the power supply reliability is completed, substituting corresponding parameters to calculate each index of the power supply reliability under different grounding modes.
Step c, calculating scores of power supply reliability indexes in each grounding mode and determining the weight of each index;
calculating the score of the power supply reliability index under each grounding mode-----，Respectively scoring the average long-term power failure times of the user per year, the average long-term power failure time of the user per year and the average short-term power failure times of the user per year;
（）
wherein,in a manner of groundingThe average long-term power failure times of the users per year are scored;in a manner of groundingAverage long-term power failure times of users;for being comparedAverage long-term power failure times of users in the grounding mode,is a constant between (0, 100 m);
（）
wherein,in a manner of groundingThe average long-term power failure time of the user is scored;in a manner of groundingAverage long-term power failure time of the user;for being comparedAverage long-term power failure time of a user in a grounding mode,is a constant between (0, 100 m);
（）
wherein,in a manner of groundingThe average annual short-time power failure times of the users are scored;in a manner of groundingAverage number of short-term power failure times per year for the user;for being comparedAverage annual average short-time power failure times of users in the grounding mode,is a constant between (0, 100 m).
Average long-term power failure times per year for users, and average short-term power failure times per year for usersThe weights are respectively used、、And the expression can be reasonably selected according to actual needs.
Step d, calculating the power supply reliability scores of all grounding modes according to the power supply reliability score model;
the power supply reliability scoring model is as follows:
wherein:、、scores corresponding to average long-term power failure times of users per year, average long-term power failure times of users per year and average short-term power failure times of users per year;、、the weights of the average long-term power failure times of the users, the average long-term power failure time of the users and the average short-term power failure times of the users can be respectively combined according to actual needsAnd (6) selecting.
Step e, comparing and determining a grounding mode with better reliability;
scoring the calculated power supply reliability of each grounding modeThe comparison is carried out in such a way that,the power supply reliability of the grounding mode with a small value is excellent.
Taking a power supply station as an example, the overhead line is based on data in the power supply stationHas a single-phase earth fault rate ofIn the low-resistance grounding mode, the ratio of the faults in the permanent single-phase grounding fault is. According to the experience of the medium-voltage distribution network: compared with the method of adopting a non-grounding mode and utilizing an instantaneous short-circuit grounding phase bus for arc extinction and line selection, the long-time power failure frequency (namely, permanent single-phase grounding fault) caused by the grounding fault is reduced by more than 50 percent after the neutral point of the power distribution network adopts the tunable arc extinction coil. In addition, as a result of examination of data, since the permanent single-phase earth fault in the ungrounded mode and the small-resistance earth mode can be approximated to be identical, the permanent single-phase earth fault rate in the resonance earth mode can be approximated to be 50% in the small-resistance earth mode, and the permanent fault rate in the single-phase earth fault in the resonance earth mode can be assumed to be 50% in the single-phase earth fault rate in the resonance earth mode；
For a low resistance grounding system, the power is cut off immediately every fault, and the power cut time is the sum (total 7 hours) of the fault finding time (counted by 3 hours) and the fault repairing time (counted by 4 hours), namely(ii) a For a resonant grounded system, it can operate with a fault for 2 hours, with the outage time being the sum of the find time (1 hour in) and the fault repair time (4 hours in total) (total 5 hours), i.e. it is。
Is set to have a length ofLineIs the number of usersIn practice, the overhead line is generally an suburban line, the protection of branch lines and distribution transformers is considered, but the automatic switching supply of a distribution network automation system is not considered, so that the number of users in each power failure of a low-resistance grounding system is set to beConsidering that the user is charged and supplied in enough time in the resonance grounding mode, the average number of the power failure users is obviously less than that of the small-resistance grounding system, and the power failure users are taken. The other data are all 0.
Meanwhile, according to the data of the power supply bureau, the on-line fault repair rate under the resonance grounding mode is known asSingle phase connectionThe probability of other lines being powered off due to the extension of ground fault overvoltage accident is。
Therefore, the power supply reliability indexes under the small resistance grounding mode and the resonance grounding mode can be obtained:
(1) low resistance grounding mode (allow reclosing):
lineNumber of long-term power failure of user (times/a) due to single-phase earth fault:
(order/a)
LineAnnual outage time (hour/a) of the user due to single-phase earth fault:
lineNumber of short-term power failures per year (times/a) of users due to single-phase earth faults:
(order/a)
(2) In the resonant grounding mode:
lineNumber of annual user blackouts due to single-phase earth faults (times/a):
(order/a)
LineAnnual outage time (hour/a) of the user due to single-phase earth fault:
(hour/a)
And manually pulling a route to realize line selection. If each bus has 10 outgoing lines on average, considering the use of experience knowledge such as fault probability of each line, the fault of each time needs to be pulled for 4 times on average, namely。
LineNumber of short-term power failures per year (times/a) of users due to single-phase earth faults:
(order/a)
And then can get the average long-term power failure number of user year, the average long-term power failure time of user year, the average short-term power failure number of user year score under the low resistance ground mode and the resonance ground mode:、、
(1) low resistance grounding mode:
(2) resonant grounding mode
Is provided withNamely, in a low-resistance grounding mode:
in the resonant grounding mode:
therefore, the following steps are carried out:. According to the calculation results of the indexes and the weights set according to needs, the power supply reliability of the overhead line power distribution network in the resonance grounding mode is better.
The grounding mode comparison process under other conditions is the same, and the description is omitted here.
The foregoing is directed to preferred embodiments of the present invention, other and further embodiments of the invention may be devised without departing from the basic scope thereof, and the scope thereof is determined by the claims that follow. However, any simple modification, equivalent change and modification of the above embodiments according to the technical essence of the present invention are within the protection scope of the technical solution of the present invention.
Claims (5)
1. A calculation method for analyzing the influence of a grounding mode on the power supply reliability of a power distribution network is characterized by comprising the following steps: the method comprises the following steps:
step a, counting relevant data of single-phase earth fault conditions of each grounding mode, and analyzing factors influencing power supply reliability;
step b, calculating each evaluation index of power supply reliability;
calculating each evaluation index of the power supply reliability according to the mathematical model of each evaluation index of the power supply reliability;
step c, calculating power supply reliability index scores under each grounding mode and determining the weight of each index;
calculating the score of each power supply reliability index according to a power supply reliability index score formula, and determining the weight of each power supply reliability index;
step d, calculating power supply reliability scores in different grounding modes;
calculating power supply reliability scores in different grounding modes according to a power supply reliability scoring model formula;
step e, comparing and determining a grounding mode with better reliability;
comparing the calculated power supply reliability scores of the grounding modes, the grounding mode with the smaller power supply reliability score has better power supply reliability.
2. The calculation method for analyzing the influence of the grounding mode on the power supply reliability of the power distribution network according to claim 1, wherein the calculation method comprises the following steps: the mathematical model of each evaluation index of the power supply reliability in the step b comprises the mathematical model of the power supply reliability evaluation index including the average long-term power failure times of the user, the average long-term power failure time of the user and the average short-term power failure times of the user.
3. The calculation method for analyzing the influence of the grounding mode on the power supply reliability of the power distribution network according to claim 2, wherein the calculation method comprises the following steps:
the mathematical model of the average long-term power failure times of the user per year is as follows:
the mathematical model of the average long-term power failure time of the user per year is as follows:
the mathematical model of the average annual short-time power failure times of the user is as follows:
wherein:as a lineLength of (d);the total number of evenly distributed users on the line;single-phase earth fault rate;is the rate of permanent single-phase earth faults;the permanent fault online repair rate is obtained;mean time to failure for a single fault;the average number of the users with power failure in a single fault is;、are respectively a lineSingle phase earth fault over-voltage accidentAnd the probability of power failure of other lines caused by the expansion of fire accidents;
wherein, when the low resistance grounding mode does not allow reclosing to be switched in,，，，(ii) a When the low resistance grounding mode allows the reclosing switch to be switched in,，，，(ii) a When the automatic line selection device selects the line in the resonance grounding mode,，，，(ii) a Manual route selection realization by resonance grounding modeWhile, set the average trial pullThe strip line can complete one-time line selection at the moment，，，。
4. The calculation method for analyzing the influence of the grounding mode on the power supply reliability of the power distribution network according to claim 1, wherein the calculation method comprises the following steps: the power supply reliability index scoring formulas in the step c are respectively as follows:
（）
wherein,in a manner of groundingThe average long-term power failure times of the users per year are scored;in a manner of groundingAverage long-term power failure times of users;for being comparedAverage long-term power failure times of users in the grounding mode,is a constant between (0, 100 m);
（）
wherein,in a manner of groundingThe average long-term power failure time of the user is scored;in a manner of groundingAverage long-term power failure time of the user;for being comparedAverage long-term power failure time average value of user in grounding mode，Is a constant between (0, 100 m);
（）
wherein,in a manner of groundingThe average annual short-time power failure times of the users are scored;in a manner of groundingAverage number of short-term power failure times per year for the user;for being comparedAverage annual average short-time power failure times of users in the grounding mode,is a constant between (0, 100 m).
5. The calculation method for analyzing the influence of the grounding mode on the power supply reliability of the power distribution network according to claim 1, wherein the calculation method comprises the following steps: the power supply reliability scoring model formula in the step d is as follows:
wherein:、、respectively scoring the average long-term power failure times of the user, the average long-term power failure time of the user and the average long-term power failure times of the user in each power supply reliability index score in the step c;、、and c, respectively weighting the average long-term power failure times of the user per year, the average long-term power failure time of the user per year and the average short-term power failure times of the user per year corresponding to the weight of each power supply reliability index in the step c.
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