CN105139145A - Medium-voltage distribution line theory line loss analysis system - Google Patents
Medium-voltage distribution line theory line loss analysis system Download PDFInfo
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- CN105139145A CN105139145A CN201510584919.4A CN201510584919A CN105139145A CN 105139145 A CN105139145 A CN 105139145A CN 201510584919 A CN201510584919 A CN 201510584919A CN 105139145 A CN105139145 A CN 105139145A
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Abstract
The present invention provides a medium-voltage distribution line theory line loss analysis system, comprising an information collection part and an analysis part. The information collection part includes a transformer information collection module, a line information collection module, a current information collection module and a load information collection module. The analysis part includes a power grid device analysis module, a power grid technology analysis module and a load distribution analysis module. The power grid device analysis module is configured to analyze the influence on the line loss caused by the selection of a power grid device; the power grid technology analysis module is configured to analyze the influence on the line loss caused by the power grid application technology; and the load distribution analysis module is configured to analyze the influence on the line loss caused by the load distribution. According to the invention, the medium-voltage distribution line theory line loss analysis system is configured to provide reference data for determining whether line losses with different types are reasonable or not, and a data support is provided to the correction of the line loss management of distribution lines exceeding the range of the line loss.
Description
Technical field
The invention belongs to medium-voltage distribution field, particularly relate to a kind of medium-voltage distribution circuit theory wire loss analytic system.
Background technology
Distribution system refers to be directly that a part of electric system that user serves, and medium voltage distribution network generally refers to from the 10kV line outlet of 110kV/10kV or 35kV/10kV step-down substation to user side.Power distribution network is as the end of power network, and its electric pressure is low, be directly connected with user, circuit distribution is wide, on-line apparatus is many, and therefore system also exists impedance, causes electric energy in conversion, conveying, assigning process inevitably along with a large amount of line loss.
Based on current basic data management present situation, all need a large amount of manpower and materials of cost to carry out line loss statistical work every year, obtain line loss whether reasonably normative reference.On the one hand, workload is complicated, has increased the weight of the work load of electric power personnel; On the other hand, the mode of data acquisition manual entry, easily causes error and inefficiency.Therefore, in the urgent need to for 10kV via net loss theory calculate and the deep research of Optimal flattening.
Summary of the invention
In view of this, the present invention proposes a kind of medium-voltage distribution circuit theory wire loss analytic system, for judging whether dissimilar line loss rationally provides reference frame, for the correction of the distribution line management line loss exceeding line loss scope provides data supporting.
For achieving the above object, the technical scheme of the invention is achieved in that
A kind of medium-voltage distribution circuit theory wire loss analytic system, comprises information part and analysis part;
Described information collection component divides and comprises transformer information acquisition module, line information acquisition module, current information acquisition module, information on load acquisition module;
Described analysis part comprises grid equipment analysis module, electric power network technique analysis module, power load distributing analysis module; The impact that described grid equipment analysis module causes line loss for the selection analyzing grid equipment; The impact that described electric power network technique analysis module causes line loss for analyzing power grid application technology; Described power load distributing analysis module is used for analysis load and distributes the impact caused line loss;
Described grid equipment analysis module corresponding described transformer information acquisition module, line information acquisition module, current information acquisition module; The corresponding described current information acquisition module of corresponding described electric power network technique analysis module; The corresponding described information on load acquisition module of described power load distributing analysis module.
Preferably, described transformer information acquisition module comprises transformer capacity information acquisition unit and transformer on-position collecting unit.
Preferably, described line information acquisition module comprises basic routing line information acquisition unit and branched line information acquisition unit, described basic routing line information acquisition unit is for gathering basic routing line length and resistance information, and described branched line information acquisition unit is for gathering branched line length and resistance information.
Preferably, described current information acquisition module comprises backbone current collecting unit and branch current collecting unit, described backbone current collecting unit is for gathering the current information of basic routing line, and described branch current collecting unit is for gathering the current information of branched line.
Preferably, described grid equipment analysis module comprises transformer analytic unit, circuit analysis unit, reactive-load compensation analytic unit; The analysis that described transformer analytic unit affects line loss for transformer total volume and quantity; The analysis that described circuit analysis unit affects line loss for circuit model and line length; Described reactive-load compensation analytic unit is used for the analysis that reactive power compensator affects line loss.
Preferably, described electric power network technique analysis module comprises voltage-regulating technique analytic unit and reactive power compensation technology analytic unit; Described voltage-regulating technique analytic unit is for analyzing the impact of voltage-regulating technique on line loss; Described reactive power compensation technology analytic unit is for analyzing the impact of reactive power compensation technology on line loss.
Preferably, described power load distributing analysis module comprises power load distributing analytic unit, and described power load distributing analytic unit is used for analysis circuit power load distributing situation and power load distributing coefficient; According to the impact of power load distributing coefficient analysis on line loss.
Further, described analytic system also comprises environmental analysis module, and described environmental analysis module is for analyzing the impact that residing for meteorology and circuit, environment causes line loss.
Relative to prior art, a kind of medium-voltage distribution circuit theory wire loss analytic system of the present invention has following advantage:
Pass through the present invention, the work of basic theory line loss analyzing can be carried out, to define in practical line loss the scope of not clear loss and fall the space of damage, thus formulating corresponding reducing loss measure, for Electric Power Network Planning, transformation and capacitance reactive compensation, economical operation provide reliable foundation.
On the one hand, for judging whether dissimilar line loss rationally provides reference frame, thus alleviating the MV distribution systems loss statistical work amount of grass-roots unit, avoiding the input of a large amount of manpower and materials, reduce human cost and improve work efficiency; On the other hand, be convenient to accurately grasp the MV distribution systems exhaustion range eliminated beyond operational management factor, for the correction of the distribution line management line loss exceeding line loss scope provides data supporting, to enhancing electrical network anti-accident ability, improve Regulation maintenance levels and there is important more practical value and realistic meaning.
Accompanying drawing explanation
The accompanying drawing forming a part of the present invention is used to provide a further understanding of the present invention, and schematic description and description of the present invention, for explaining the present invention, does not form inappropriate limitation of the present invention.In the accompanying drawings:
Fig. 1 is structural representation of the present invention.
Embodiment
It should be noted that, when not conflicting, the feature in embodiments of the invention and embodiment can combine mutually.
Below with reference to the accompanying drawings and describe the present invention in detail in conjunction with the embodiments.
Loss analysis for 10KV MV distribution systems:
10kV via net loss affects by many factors, can be divided into three major types according to each factor character, is grid equipment factor, electric power network technique factor, power load distributing respectively.
Grid equipment factor mainly comprises the factors such as transformer, circuit, reactive-load compensation equipment.
Electric power network technique factor mainly refers to, to the influential different equipment technology of line loss tool, mainly comprise: voltage-regulating technique and reactive power compensation technology etc.
Power load distributing refers to the type that load distributes along circuit.
One: grid equipment factor
1. transformer affects 10kV via net loss
Transformer is selected to be mainly manifested in transformer capacity, number transformer and transformer model (S7 is serial, S9 is serial, S11 is serial) line loss impact.
To identical load, there is the transformer capacity making transformer loss minimum, when departing from this capacity, transformer loss will increase.To same time 10kV circuit, number transformer affects loss.
The line is busy that to damage proportion comparatively large in transformer loss, and answer emphasis to carry out considering total volume and the quantity of transformer, load factor 30% transformer of such as 10 SCB10-500, is calculated as follows:
When calculating minimal losses, replace with max cap. model SCB10-2500 equivalence in current SCB10 type, be equivalent to the SCB10-2500 transformer 10*500/2500=2 platform of load factor 30%.Then the SCB10-2500 transformer loss minimal losses the most of these 2 load factors 30% is calculated.
When calculating maximum loss, with in current SCB10 type minimum capacity model SCB10-250 equivalence replace: be equivalent to load factor be 30% SCB10-250 number of units be 10*500/250=20 platform, then calculate the SCB10-250 transformer loss maximum loss the most then calculating these 2 load factors 30%.
2. circuit affects 10kV via net loss
The wire type of circuit, line length, system of laying, arrangement of conductor even earthing mode etc. all have impact to loss.
When conductor cross-section increases, resistance reduces, and loss will be caused to decline; Otherwise when conductor cross-section reduces, resistance increases, and loss will be caused to rise.
When line length increases, resistance increases, and loss will be caused to rise; Otherwise when line length reduces, resistance reduces, and loss will be caused to decline.
Conductor laying mode, arrangement of conductor (horizontal, homeotropic alignment, triangle arrangement and wire spacing) have impact on line parameter circuit value (admittance, electric capacity, reactance), thus have influence on line loss.
In reality, conductor laying mode, arrangement of conductor and earthing mode are less on line loss impact, and wire type and line length are on the impact of line loss to answer emphasis to consider.
3. reactive-load compensation is on the impact of 10kV via net loss
Reactive-load compensation is mainly through compensation capacity, compensation way and compensation system distribution influence line loss.
When Reactive Power Device capacity configuration is different, power network current by different, thus affects line loss; Different compensation ways also affects line loss.Current Reactive Compensation Mode is roughly divided into fixed compensation and auto-compensation.The magnitude numerical value that fixed compensation is equivalent to change power network current is stable, and the power network current size that auto-compensation is equivalent to change different loads is different, thus affects line loss.In addition, the distribution of reactive power compensator also has impact to line loss.For low-voltage compensation, when only installing reactive power compensator in substation transformer low-pressure side, not affecting the electric current of low-voltage circuit, only the above system of substation transformer being had an impact; And when installing reactive power compensator in user side, then can reduce the electric current of low-voltage circuit, the above system of substation transformer is had an impact too, thus line loss is had an impact.
Known by above analysis, reactive-load compensation, by the idle transmission at electrical network of impact, changes power network current, and square being directly proportional of line loss and electric current, thus reactive-load compensation produces considerable influence to line loss, therefore, should consider that Reactive Power Device is on the impact of line loss from the angle of line current.
4. other equipment are on the impact of 10kV via net loss
Circuit widely used iron or aluminum metal-ware, switch, automation installation and metering outfit etc. also can have an impact to line loss due to its model difference, and such as stem-winder loss monthly can reach 1kWh, and electronic watch loss is that the half of stem-winder is even less.But the region larger for user power utilization electricity, the impact of above factor on line loss is less, can not consider.
Two: electric power network technique factor
1, voltage-regulating technique is on the impact of 10kV via net loss
Electrical network is in operation, and voltage is not stablize constant, but change along with the change of load, voltage-regulating technique can change line voltage, make the whole network voltage in allowed band in more by a small margin.The voltage-regulating technique of voltage mainly contains transformer regulating (without excitation pressure regulation, on-load voltage regulation) and reactive-load compensation.When load is constant, adopts Voltage Technique that voltage is raised, can electric current be reduced, circuit line loss is reduced, and the now fixed loss of transformer will raise; Then inverse variation is produced when voltage is reduced.
Therefore, should consider that voltage-regulating technique is on the impact of 10kV via net loss from the angle of line current.
2, reactive power compensation technology is on the impact of 10kV via net loss
Reactive-load compensation is the key factor affecting line loss, the impact of reactive power compensation technology on line loss is embodied in reactive power compensator automatization level, as fixed compensation, grouping switching robotization compensate and dynamic auto compensation technique, improve line current, line loss is impacted.Therefore, should consider that reactive power compensation technology is on the impact of 10kV via net loss from the angle of line current.
Three: power load distributing factor
Payload and power load distributing all have considerable influence to line loss: under voltage certain condition, power network line loss power and transformer variable loss power are directly proportional to load square, load is larger, and loss power is larger, has different power attenuation rates under different load level; Power load distributing is different, also has impact to line loss.When load concentrates on supply line's end, line loss is maximum, and loss minimization when concentrating on circuit head end, under other distributed condition, line loss is between both.
Therefore, should consider that payload is on the impact of line loss from the angle of line current, and consider seven kinds of power load distributing coefficients (1, load is uniformly distributed; 2, load evenly successively decreases distribution; 3, load uniform increments distribution; 4, load first half section uniform increments, second half section evenly successively decrease; 5, load first half section evenly successively decrease, second half section uniform increments; 6, load first uniform increments along the line, evenly to successively decrease afterwards; 7, load along the line first evenly to successively decrease, rear uniform increments) impact on line loss.
Four: environmental factor
The change of meteorological condition, will cause the change of electrical network parameter on the one hand, thus cause line loss to change.As temperature raises, resistance will be caused to increase; Humidity increases, and leakage reactance will be caused to diminish; Rainy weather will make soil resistivity reduce, and stake resistance is reduced.Meeting acceleration equipment is aging on the other hand, has an impact to the power supply facilities maintenances such as line corridor and health status, as aging in multicore low-voltage insulation, and Leakage Current increases, increasing device loss to a certain extent; Trees cleaning under line corridor not in time, may cause tree electric discharge, increasing device loss.But the above impact that these produce line loss is less, so substantially do not consider.
In sum, the present invention carries out theory wire loss analysis to 10KV MV distribution systems, should have following 26S Proteasome Structure and Function, as shown in Figure 1:
Comprise information part and analysis part;
Described information collection component divides and comprises transformer information acquisition module, line information acquisition module, current information acquisition module, information on load acquisition module;
Described analysis part comprises grid equipment analysis module, electric power network technique analysis module, power load distributing analysis module; The impact that described grid equipment analysis module causes line loss for the selection analyzing grid equipment; The impact that described electric power network technique analysis module causes line loss for analyzing power grid application technology; Described power load distributing analysis module is used for analysis load and distributes the impact caused line loss;
Described grid equipment analysis module corresponding described transformer information acquisition module, line information acquisition module, current information acquisition module; The corresponding described current information acquisition module of corresponding described electric power network technique analysis module; The corresponding described information on load acquisition module of described power load distributing analysis module.
Wherein, described transformer information acquisition module comprises transformer capacity information acquisition unit and transformer on-position collecting unit.
Wherein, described line information acquisition module comprises basic routing line information acquisition unit and branched line information acquisition unit, described basic routing line information acquisition unit is for gathering basic routing line length and resistance information, and described branched line information acquisition unit is for gathering branched line length and resistance information.
Wherein, described current information acquisition module comprises backbone current collecting unit and branch current collecting unit, and described backbone current collecting unit is for gathering the current information of basic routing line, and described branch current collecting unit is for gathering the current information of branched line.
Wherein, described grid equipment analysis module comprises transformer analytic unit, circuit analysis unit, reactive-load compensation analytic unit; The analysis that described transformer analytic unit affects line loss for transformer total volume and quantity; The analysis that described circuit analysis unit affects line loss for circuit model and line length; Described reactive-load compensation analytic unit is used for the analysis that reactive power compensator affects line loss.
Wherein, described electric power network technique analysis module comprises voltage-regulating technique analytic unit and reactive power compensation technology analytic unit; Described voltage-regulating technique analytic unit is for analyzing the impact of voltage-regulating technique on line loss; Described reactive power compensation technology analytic unit is for analyzing the impact of reactive power compensation technology on line loss.
Wherein, described power load distributing analysis module comprises power load distributing analytic unit, and described power load distributing analytic unit is used for analysis circuit power load distributing situation and power load distributing coefficient; According to the impact of power load distributing coefficient analysis on line loss.
In addition, described analytic system can also comprise environmental analysis module, and described environmental analysis module is for analyzing the impact that residing for meteorology and circuit, environment causes line loss.
By the present invention, 10KV MV distribution systems can be met and analyze requirement, carry out theory wire loss analytical work.
The foregoing is only preferred embodiment of the present invention, not in order to limit the present invention, within the spirit and principles in the present invention all, any amendment done, equivalent replacement, improvement etc., all should be included within protection scope of the present invention.
Claims (8)
1. a medium-voltage distribution circuit theory wire loss analytic system, is characterized in that: comprise information part and analysis part;
Described information collection component divides and comprises transformer information acquisition module, line information acquisition module, current information acquisition module, information on load acquisition module;
Described analysis part comprises grid equipment analysis module, electric power network technique analysis module, power load distributing analysis module; The impact that described grid equipment analysis module causes line loss for the selection analyzing grid equipment; The impact that described electric power network technique analysis module causes line loss for analyzing power grid application technology; Described power load distributing analysis module is used for analysis load and distributes the impact caused line loss;
Described grid equipment analysis module corresponding described transformer information acquisition module, line information acquisition module, current information acquisition module; The corresponding described current information acquisition module of corresponding described electric power network technique analysis module; The corresponding described information on load acquisition module of described power load distributing analysis module.
2. a kind of medium-voltage distribution circuit theory wire loss analytic system according to claim 1, is characterized in that: described transformer information acquisition module comprises transformer capacity information acquisition unit and transformer on-position collecting unit.
3. a kind of medium-voltage distribution circuit theory wire loss analytic system according to claim 1, it is characterized in that: described line information acquisition module comprises basic routing line information acquisition unit and branched line information acquisition unit, described basic routing line information acquisition unit is for gathering basic routing line length and resistance information, and described branched line information acquisition unit is for gathering branched line length and resistance information.
4. a kind of medium-voltage distribution circuit theory wire loss analytic system according to claim 1, it is characterized in that: described current information acquisition module comprises backbone current collecting unit and branch current collecting unit, described backbone current collecting unit is for gathering the current information of basic routing line, and described branch current collecting unit is for gathering the current information of branched line.
5. a kind of medium-voltage distribution circuit theory wire loss analytic system according to claim 1, is characterized in that: described grid equipment analysis module comprises transformer analytic unit, circuit analysis unit, reactive-load compensation analytic unit; The analysis that described transformer analytic unit affects line loss for transformer total volume and quantity; The analysis that described circuit analysis unit affects line loss for circuit model and line length; Described reactive-load compensation analytic unit is used for the analysis that reactive power compensator affects line loss.
6. a kind of medium-voltage distribution circuit theory wire loss analytic system according to claim 1, is characterized in that: described electric power network technique analysis module comprises voltage-regulating technique analytic unit and reactive power compensation technology analytic unit; Described voltage-regulating technique analytic unit is for analyzing the impact of voltage-regulating technique on line loss; Described reactive power compensation technology analytic unit is for analyzing the impact of reactive power compensation technology on line loss.
7. a kind of medium-voltage distribution circuit theory wire loss analytic system according to claim 1, it is characterized in that: described power load distributing analysis module comprises power load distributing analytic unit, described power load distributing analytic unit is used for analysis circuit power load distributing situation and power load distributing coefficient; According to the impact of power load distributing coefficient analysis on line loss.
8. a kind of medium-voltage distribution circuit theory wire loss analytic system according to claim 1, it is characterized in that: described analytic system also comprises environmental analysis module, described environmental analysis module is for analyzing the impact that residing for meteorology and circuit, environment causes line loss.
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| CN109615207A (en) * | 2018-12-04 | 2019-04-12 | 国网山东省电力公司无棣县供电公司 | A kind of low-voltage platform area supply load concocting method and system |
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| CN110261697A (en) * | 2019-06-20 | 2019-09-20 | 中国电力科学研究院有限公司 | The line loss calculation method and system of overhead transmission line in actual operating mode |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN107453369A (en) * | 2017-07-05 | 2017-12-08 | 北京天泰怡和科技有限公司 | Intelligent distribution network optimization economize on electricity drop damage system |
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Application publication date: 20151209 |