CN105321123A - Comprehensive evaluation system and review method for power distribution network of project - Google Patents
Comprehensive evaluation system and review method for power distribution network of project Download PDFInfo
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- CN105321123A CN105321123A CN201510651463.9A CN201510651463A CN105321123A CN 105321123 A CN105321123 A CN 105321123A CN 201510651463 A CN201510651463 A CN 201510651463A CN 105321123 A CN105321123 A CN 105321123A
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
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- Y04S—SYSTEMS INTEGRATING TECHNOLOGIES RELATED TO POWER NETWORK OPERATION, COMMUNICATION OR INFORMATION TECHNOLOGIES FOR IMPROVING THE ELECTRICAL POWER GENERATION, TRANSMISSION, DISTRIBUTION, MANAGEMENT OR USAGE, i.e. SMART GRIDS
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Abstract
Support for power distribution network planning and project optimization sequencing is provided by proposing a review method for scientifically determining an investment scale of power distribution network construction. Key indexes, such as an N-I passing rate and a reloading rate, of a power distribution network are taken as targets, and an evaluation result is used as an important basis for evaluating necessity of a project. The power distribution network project is scientifically evaluated by establishing an index system model, and a project implementation effect is predicted and analyzed. Investment efficiency is substantially increased, and unordered and inefficient investments are avoided. In a process of constructing an evaluation system, a power distribution network development state is taken as a start, development indexes are analyzed, and the indexes are orientated and described by classification. The project is classified according to a development target, a scientific comprehensive evaluation index system is established, an evaluation standard of a qualitative index and a quantitative index is determined, a quantification evaluation method of the power distribution network planning and construction is researched, and an index weight is properly determined, to propose the review method for scientifically determining an investment scale of power distribution network construction.
Description
Technical field
The present invention relates to the anticipation of power distribution network project implementation effect, for rationally determining that key target for investment and scale of investment provide the comprehensive assessment system of important policy-making foundation, belonging to power industry planning for the expansion of power grids management domain.
Background technology
Electrical network assessment traditional is at present all the after-action review for planning implementation effect, not strong to the directive significance of power network development, have passed the transformation of city net for many years and rural power grids, Shanxi Province's distribution network transform progress achieves certain achievement, be greatly improved in power supply target and power supply reliability, but still there is many problems:
1) grid structure is relatively weak, and power supply capacity is not enough.
Due to distribution construction and transformation funds deficiency, and the exploitation of city Rapid Expansion, cause distribution grid structure relatively weak, power supply capacity is not strong.
2) distribution running environment is severe, and economy is not high.
Power network line is aging, transformer underloading, outside destroy, theft and customer power supply facility failure outstanding problem, have a strong impact on distribution economical operation.
3) electric network reconstruction dynamics is inadequate, and power supply quality is not up to standard.
Circuit overload is serious, radius of electricity supply is long, three-phase imbalance is serious, reactive-load compensation is not enough causes power supply quality to decline.
For the problem that power distribution network power supply capacity, power supply quality and economy are not high, present situation electrical network is assessed from power supply capacity, power supply quality, economy three general orientation.Corresponding Proposal for update is provided, the newly-built and transformation project of reasonable arrangement according to assessment result.
Summary of the invention
The inventive method is intended to solve the outstanding problem such as low-level, duplicate construction perplexing power distribution network for a long time, for rationally determining the policy-making foundation that key target for investment and scale of investment provide important.
For achieving the above object, technical scheme of the present invention is as follows:
Affect two angles from present situation electrical network and engineering project, carry out the foundation of evaluation system, and by its assessment foundation as electrical network.Evaluation system is divided into two large divisions, and a part is the assessment for present situation electrical network, and the data of institute's foundation are device data and the peak load data of present situation electrical network; Another part is the assessment for engineering project impact, and foundation is except device data and peak load data, and also need scrap build information and the load increment of engineering project, its step is as follows:
(1) propose distribution network planning project evaluation target, start with from power distribution network current situation, analyze present situation development indicators, and the location that index is classified and description.
(2) propose distribution network planning classification of the items method, comprehensively analyze for power distribution network developing goal and lay the foundation.
(3) according to developing goal, classification of the items, set up item comprehensive evaluation model, researchs and proposes scientific and reasonable power distribution network assessment indicator system.
(4) study the quantitative estimation method that distribution network planning is built, reasonable agriculture products weight, sets up unified evaluation criteria and workflow.
(5) reviewing method of science determination distribution network construction scale of investment and key target for investment is proposed.
(6) build informatization platform and dock with " huge construction program " infosystem, by the arrangement of achievement overall application in power distribution network project.
Accompanying drawing explanation
Fig. 1 is institute's using method FB(flow block) in an embodiment of the present invention (power distribution network synthesis evaluation system implementing procedure figure).
Fig. 2 is this practical example project evaluation process flow diagram
Fig. 3 is this example assessment weight setting figure
Fig. 4 is this instance system one-piece construction figure
Embodiment
Below in conjunction with the drawings and specific embodiments, the invention will be further described.
Embodiment:
1. set up evaluation system
Affect two angles from present situation electrical network and engineering project, carry out the foundation of evaluation system.Intrinsic complicacy is assessed for power distribution network, need to set up effective appraisal procedure and system to it, and by its assessment foundation as electrical network, appraisal procedure should support that various ways is as present situation electrical network simultaneously, newly-built electrical network, the assessment of the multiple mode classifications such as subregion electrical network.Affecting operation of power networks undesirable element to search, should accomplish to make clear to the result of assessment, should navigate on concrete equipment, and prompting is provided to solution, and then effectively instruct electric network reconstruction and planning.
Generally speaking, evaluation system is divided into two large divisions, a part is the assessment for present situation electrical network, and the data of institute's foundation are device data and the peak load data of present situation electrical network; Another part is the assessment for engineering project impact, and foundation, except device data and peak load data, also needs scrap build information and the load increment of engineering project.
Because evaluation item is more, there is different stressing different regions to difference assessment, so introduce the concept of score value in evaluation system, for composing disparity items in system with different weights.
Have passed the transformation of city net for many years and rural power grids, Shanxi Province's distribution network transform progress achieves certain achievement, be greatly improved in power supply target and power supply reliability, but still there is many problems, for the problem that power distribution network power supply capacity, power supply quality and economy are not high, Shanxi Province's present situation electrical network is assessed from power supply capacity, power supply quality, economy three general orientation.Corresponding Proposal for update is provided, the newly-built and transformation project of reasonable arrangement according to assessment result.
1.1 evaluation of power supply capability
1) apparatus of load rate qualification rate index
This indicator-specific statistics object is the main transformer and circuit that are running in the middle of the whole network or 110kV sheet net, adds up the Qualification of its load factor.Being considered as heavy duty when load factor is more than 80%, is overload more than 100%.
2) N-1 qualification rate index
This indicator-specific statistics object is the main transformer and circuit that are running in the middle of the whole network or 110kV sheet net, adds up the Qualification that its N-1 calculates.
3) substation operation mode qualification rate index
This indicator-specific statistics object is the transformer station run in the middle of the whole network or 110kV sheet net, adds up the ratio that its method of operation meets security regulations.
4) radius of electricity supply qualification rate index
This indicator-specific statistics object is the 10kV feeder line in the middle of the whole network or 110kV sheet net, adds up the qualified ratio of its radius of electricity supply.In rural power grids, 10kV feeder line is then considered as long more than 15km.
5) main transformer on average most high capacity rate index
This indicator-specific statistics object is the main transformer in the middle of the whole network or 110kV sheet net, adds up its average most high capacity rate level.Average most high capacity rate gets the highest daily peak load mean value calculation of 25 days of annual load.When there are 2 main transformers in transformer station, with within 50% for acceptability limit; When there are 3 main transformers in transformer station, with within 65% for acceptability limit; When there are 4 main transformers in transformer station, with within 72% for acceptability limit.
6) transformer station and subscriber station mode of connection evaluation index
This indicator-specific statistics object is transformer station in the middle of the whole network or 110kV sheet net and subscriber station, adds up the rationality of its mode of connection.
1.2 power supply quality assessments
1) line voltage distribution landing qualification rate index
This indicator-specific statistics object is the 110 ~ 35kV circuit run in the middle of the whole network or 110kV sheet net, adds up the Qualification of its voltage-drop, is considered as out-of-limit when voltage-drop is more than 5%.
2) busbar voltage qualification rate index
This indicator-specific statistics object is the mesolow side bus run in each transformer station in the middle of the whole network or 110kV sheet net, adds up its voltage Qualification.According to the internal examination regulation of " regulation of the some engineering philosophy of electrical network " and Utilities Electric Co., the voltage acceptability limit of 110kV bus is the voltage acceptability limit of-3% ~+7%, 35 ~ 10kV bus is 0% ~+7%.
3) main transformer power factor qualification rate index
This indicator-specific statistics object is the main transformer run in the middle of the whole network or 110kV sheet net, adds up the Qualification of its low side power factor.According to " regulation of the some engineering philosophy of electrical network ", the power factor acceptability limit of the secondary side of 220kV transformer station is the power factor acceptability limit of 0.95 ~ 0.98,110kV and 35kV substation secondary side is 0.9 ~ 0.98.In addition, also power factor should be considered as the situation of reactive power releasing defective.
1.3 economic evaluation
1) main transformer theory wire loss qualification rate index
This indicator-specific statistics object is the main transformer run in the middle of the whole network or 110kV sheet net, adds up the Qualification of its theoretical loss calculation.When theoretical loss calculation lower than 1% time be considered as out-of-limit.
2) main transformer load balancing degrees index
This indicator-specific statistics object is the main transformer run in each transformer station in the middle of the whole network or 110kV sheet net, adds up its load balance degree.It is qualified to be considered as within load factor difference 30%.
3) high damage distribution transforming rate index
This indicator-specific statistics object is through the improved the whole network circuit of engineering project, adds up its theoretical loss situation.It is identical that statistical method and present situation net height damage distribution transforming rate index.
4) main transformer Optimal load coefficient index
This indicator-specific statistics object is the main transformer in the middle of the whole network or 110kV sheet net, adds up the deviation situation between its Rate of average load and Optimal load coefficient.
2. projects is to the impact evaluation of electrical network
Because newly-built, the yet to be built project of power distribution network is numerous, project can cause the impact of stability to electrical network, so the equipment that should affect from project yet to be built is started with, the type of engineering project is segmented, assess according to the class after segmentation again, the quality of outstanding a certain intermediate item, assesses each kind equipment in this engineering project.Electrical network belonging to simultaneously combining, assesses whole electrical network, and then finds its issuable impact.
The basic ideas of engineering project impact evaluation are for being first divided into " by engineering objective classification ", " by engineering equipment classification " two large classes by engineering, segment again from each large class again, be divided into the assessment of two-stage, then the engineering project run in real work is segmented by different classification.
Appraisal procedure then utilizes projects assessment mode in present situation electrical network again to add up the equipment adding or change in engineering project, load condition, the engineering project yet to be built counting certain or a certain class builds the impact of rear projects evaluation index on existing electrical network, as shown in Figure 2.
The classification of 2.1 projects
Projects is mainly divided into " by engineering objective classification ", " by engineering equipment classification " two large classes, wherein " by engineering objective classification " be divided into again the percent of pass of N-1 " improve ", " minimizing radius of electricity supply ", " increasing power supply point ", " optimizing 10KV outlet position in storehouse " four large classes, classify by engineering objective and be divided into again " pole line platform district class ", " transformer station pole line class ", " platform district cable class " three groups.
Classify by engineering objective: engineering yet to be built is planned object angle from engineering, the impact brought after engineering construction is segmented, be also beneficial to while specifying its own significance place of engineering and a strict control is carried out to engineering project.The project wherein improving the percent of pass of N-1 mainly improves existing power distribution network 10kV circuit based on radiation type electric supply, and load factor is too high, and segmentation is unreasonable, and connectivity number is very few, cannot meet N-1 criterion; It is unreasonable that minimizing radius of electricity supply intermediate item is mainly used in improving rack, and circuit is long, Yong Huduo, 10kV line powering radius is excessive.It is very few that optimization 10KV outlet position in storehouse intermediate item is mainly used in improving transformer station's power supply point, and 10kV outlet position in storehouse is very few, and it is too much that low capacity Middle Voltage takies transformer station 10kV position in storehouse, causes the low situation of transformer station 10kV position in storehouse utilization ratio.
Classify by engineering equipment: classify by equipment difference involved in different engineering project, if any engineering project relate to the upgrading of transformer station and overhead transmission line in 110kV.Have and belong to transformer station, track remodelling class; If engineering item mainly adjusts the grid structure in pole line and platform district, belong to pole line, platform district class; Engineering project, as being only adjust low-voltage platform area, cable, belongs to platform district, cable intermediate item.
2.2 assessment weight
The assessment of engineering project divides from different classification dimensions engineering project, this mode classification ensure that taxonomic diversity, comprehensive while also have certain problem.Often different engineering projects may belong to assessment classification in multiple, this has just occurred that a project belongs to the situation in multiple evaluation index direction, at this moment then needs to arrange weight to different direction of assessments.Shown in concrete accompanying drawing 3.
Assessment before an engineering project yet to be built is examined, and object classification in project is arranged by different weights, and then weights different in device class is arranged.The estimation items arranged is not had not participate in assessment.And then assess by the method that the estimation items arranged corresponding in the assessment models of present situation electrical network finds out correspondence.
2.3 assessment result
For the assessment result of engineering project different directions, give the assessment suggestion of different directions.
The suggestion of power supply capacity aspect: the main transformer point transformer station higher to load factor lists the loading condition of main transformer, and recommended replacement suitable capacity main transformer or the change method of operation; The situation long to feeder line radius of electricity supply after statistics, gives to point out and advises transforming longer feeder line.Prompting is provided to the equipment do not calculated by N-1, out-of-date loading condition as obstructed in main transformer, the time loading condition that service interruption is crossed; Provide the power supply situation at responsible consumer station when transformer station and responsible consumer are assessed, warning is provided to ungratified subscriber station, and the power supply path that display is actual.
The suggestion of power supply quality aspect: line drop is added up, and compare with the acceptance value preset, if pressure drop ratio is comparatively large, then provides prompting, and provide the suggestion needing to install additional reactive power compensator; Statistics busbar voltage qualification rate situation, and the value that underproof situation provides no-power vacancy is gone out to the busbar voltage classified calculating of different electric pressure; In statistics different substation, the power factor of transformer, provides the prompting of wanted compensating reactive power to the underproof situation of power factor.
The suggestion of power supply economics aspect: add up main transformer theoretical loss, and compare with active loss, reminds main transformer larger for deviation, and prompting needs the inspection carrying out measurement aspect; Distribution transforming is carried out to the statistics of loss, list the distribution transforming that loss is larger, and provide the suggestion changing distribution transforming model.
The suggestion of engineering project aspect: Engineering Project Evaluation suggestion is mainly carried out from the engineering of classifying by engineering objective, wherein the engineering in different engineering classification is assessed after arranging weight, different direction of assessments is finally divided to provide assessment result suggestion, if statistics is improving in the engineering project in N-1, to the index situation of power supply capacity, power supply quality, power supply economics aspect.Identical assessment is carried out to the engineering of difference classification, and finally provides the effect of dissimilar engineering in raising mains supply ability, power supply quality, economy.And assessment result is sorted.
According to above classification of the items dissimilar project assessed by project evaluation method, add analysis and aid decision making, generate and assess form accordingly.The assessment result that form content comprises title, date of formation, the assessment result of every index and corresponding interpretation of result and aid decision making suggestion, gathers.
3. reviewing method
Strict practicable " huge construction program " System Construction scheme is about the related request of power distribution network project appraisal, and in conjunction with evaluation system achievement, various dimensions carry out project appraisal.
Strengthen the management of appraising to prefecture-level company's project scheduling, arrange the beginning of the year company of prefectures and cities to report annual engineering project proposed program, province development of company portion organizes relevant department to evaluate reporting plan.In units of company of city, according to by classification of the items principle, after item argument is calculated by evaluating system, quantize to show that key index promotes degree.In conjunction with object of planning requirement, correctly whether, the ratio between investments of scale of investment and each intermediate item is the need of adjustment for comprehensive analysis project investment direction and key target for investment.
The careful authority of examining and appraising of 220 and 110 kilovolts of normal grid projects is transferred to province through grinding institute by current Guo Wang company, economize companies ask and economize the leading action carrying out technical support through grinding institute, entrust the normal grid project of evaluation can compile carefully system and evaluation quality overall responsibility to company of province.35 kilovolts and following items foundation intersection audit and review, the whole province sets up the north, middle part, three evaluation groups in south.
Before evaluation, one by one analysis and assessment are carried out to engineering project by Review Team, by the impact of single project on the whole network, carry out project necessity demonstration.Company of province organize regularly to can compile carefully system and evaluation situation spot-check, to not carrying out being circulated a notice of criticism of analysis and assessment on request, and include checking system in.
4. the foundation of power distribution network evaluating system informatization platform
In conjunction with " huge construction program " information platform that Guo Wang company one-level is disposed, after power distribution network evaluation information system is built by Shanxi company, strictly include program plan informatization platform in and implement.
In order to better analysis project project is on the impact of electrical network, need the docking of " huge construction program " management system.The technological means of application message, sets up evaluation system and program plan system interface, thus carries out unified management and calculating.While being docked at raising assess effectiveness by data, be convenient to the fast finding of assessment result and suggestion improvement.By depositing unified for data in a database, and in conjunction with the basic power distribution network data that existing system derives, set up facilities network rack data.In conjunction with engineering project already present in existing Engineering Project Mgmt System, synchronous operation is carried out to data, set up engineering project database, and carry out perfect further to desired data in Engineering Project Evaluation.The success of system docking ensure that present situation electrical network carries out the result correctness of assessment and engineering project impact evaluation, and overall system architecture as shown in Figure 4.
Although above-mentioned, the specific embodiment of the present invention is described; but not limiting the scope of the invention; the technological development personnel in affiliated field should be understood that; on the basis of technical scheme of the present invention; the technological development personnel of this area and association area do not need to pay the various amendment or distortion that creative work can make, still within protection scope of the present invention.
Claims (4)
1. present situation electrical network assessment
According to the method that device data and the peak load data of present situation electrical network are assessed present situation electrical network.
2. engineering project impact evaluation
Not only according to device data and peak load data, also need the engineering project impact evaluation method that the scrap build information of engineering project and load increment carry out.
3. reviewing method
After being calculated by evaluating system by item argument, quantize to draw key index, in conjunction with evaluation system achievement, various dimensions carry out project appraisal.
4. power distribution network evaluating system informatization platform
The technological means of application message, sets up evaluation system and program plan system interface, thus carries out unified management and calculating, is convenient to the fast finding of assessment result and suggestion improvement.
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| CN108305017A (en) * | 2018-03-06 | 2018-07-20 | 国网陕西省电力公司经济技术研究院 | A kind of analysis method of 35kV power distribution networks development model |
| CN108665133A (en) * | 2017-03-31 | 2018-10-16 | 中国电力科学研究院 | A kind of construction method and system of distribution system operational efficiency evaluation model |
| CN110310048A (en) * | 2019-07-10 | 2019-10-08 | 云南电网有限责任公司电力科学研究院 | A kind of distribution planning overall process appraisal procedure and device |
| CN112737123A (en) * | 2020-12-28 | 2021-04-30 | 王文林 | Visual early warning system of regional electric wire netting intelligent scheduling |
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Cited By (5)
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| CN112737123A (en) * | 2020-12-28 | 2021-04-30 | 王文林 | Visual early warning system of regional electric wire netting intelligent scheduling |
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Application publication date: 20160210 |