CN104795813A - Method for constructing medium-voltage distribution network demonstration system accessed by adaptive distributed power source - Google Patents
Method for constructing medium-voltage distribution network demonstration system accessed by adaptive distributed power source Download PDFInfo
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- CN104795813A CN104795813A CN201510162857.8A CN201510162857A CN104795813A CN 104795813 A CN104795813 A CN 104795813A CN 201510162857 A CN201510162857 A CN 201510162857A CN 104795813 A CN104795813 A CN 104795813A
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J2203/00—Indexing scheme relating to details of circuit arrangements for AC mains or AC distribution networks
- H02J2203/20—Simulating, e g planning, reliability check, modelling or computer assisted design [CAD]
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Abstract
A method for constructing a medium-voltage distribution network demonstration system accessed by an adaptive distributed power source includes determining main transformer capacity by 50% of load rate according to the maximum load of a target area, selecting a radiative frame structure as a frame structure of the medium-voltage distribution network, determining feeder line section of the medium-voltage distribution network by a method of selecting lead section by economic load power supply distance, and finally constructing the medium-voltage distribution network demonstration system according to the determined main transformer capacity, the radiative frame structure and the feeder line section, so that planners of the power distribution network can accurately analyze influences of the power distribution network accessed by the distributed power source according to the constructed medium-voltage distribution demonstration system quantitatively.
Description
Technical field
The present invention relates to Distribution system design technical field, particularly a kind of method building the medium voltage distribution network example system adapting to distributed power source access.
Background technology
Deterioration and the human society of exhaustion, the earth environment day by day of fossil fuel increase the dependence of the energy, make the utilization of distributed power source become the important means of national governments' energy-saving and emission-reduction, development green energy resource.Distributed power source generally can access medium voltage distribution network on the spot, greatly changes the general layout of original power distribution network, brings deep effect to power distribution network.
When distribution network planning personnel carry out planning application work, need the calculation of distribution network model that holds water to support, distributed power source access centering could be assessed scientifically and rationally and be press-fitted the impact that power distribution network brings.But power distribution network is larger, multi-point and wide-ranging, complex structure, containing a fairly large number of feeder line, distribution transforming etc., makes to set up unified example system model and becomes extremely difficult.
Summary of the invention
In view of this, be necessary to provide a kind of method building the medium voltage distribution network example system adapting to distributed power source access, said method is utilized to set up a medium voltage distribution network example system adapting to distributed power source and access, to carry out quantitative analysis exactly on after distributed power source access to the impact of power distribution network.
Build a method for the medium voltage distribution network example system adapting to distributed power source access, comprise the steps:
According to the peak load of objective area, undertaken determining main transformer capacity by 50% load factor;
Selective radiation formula grid structure is the grid structure of medium voltage distribution network;
Economic load power supply distance is adopted to select the method for conductor cross-section to determine feeder line cross section in medium voltage distribution network, wherein, economic load power supply distance refers to when reaching the maximum voltage drop allowable value that electric power enterprise specifies, the maximum distance that can reach when predetermined cross-sectional wire bearing maximum economic load level;
Construct the medium voltage distribution network example system of objective area according to the main transformer capacity determined, radiant type grid structure and feeder line cross section, on after distributed power source access, quantitative analysis is exactly carried out on the impact of power distribution network according to the medium voltage distribution network example system built to make distribution network planning personnel.
Above-mentioned structure adapts to the method for the medium voltage distribution network example system of distributed power source access, according to the peak load of objective area, undertaken determining main transformer capacity by 50% load factor, selective radiation formula grid structure is the grid structure of medium voltage distribution network, economic load power supply distance is adopted to select the method for conductor cross-section to determine feeder line cross section in medium voltage distribution network, last according to the main transformer capacity determined, the medium voltage distribution network example system of objective area is constructed in radiant type grid structure and feeder line cross section, on after distributed power source access, quantitative analysis is exactly carried out on the impact of power distribution network according to the medium voltage distribution network example system built to make distribution network planning personnel.
Accompanying drawing explanation
Accompanying drawing 1 is the flow chart of steps of the method for the medium voltage distribution network example system of the structure adaptation distributed power source access of a better embodiment.
Fig. 2 is the peak load-cost curve of middle pressure feeder line cross section series.
Fig. 3 is the method concrete steps flow chart building the 10kV medium voltage distribution network example system adapting to distributed power source access.
Fig. 4 is 10kV medium voltage distribution network example system.
In figure: the method step S301 ~ S304 building the medium voltage distribution network example system adapting to distributed power source access.
Embodiment
Please refer to Fig. 1, it is the method flow diagram of the medium voltage distribution network example system of the structure adaptation distributed power source access of a better embodiment, and this structure adapts to the method for the medium voltage distribution network example system of distributed power source access, comprises the steps:
Step S301, according to the peak load of objective area, is undertaken determining main transformer capacity by 50% load factor.
Step S302, selective radiation formula grid structure is the grid structure of medium voltage distribution network.Wherein, the grid structure of domestic medium voltage distribution network is based on radiant type, and chain type and looped network, under normal operating conditions also based on open loop, are similar to the operational mode of radiant type grid structure, therefore the grid structure selective radiation formula of medium voltage distribution network example system.
Step S303, economic load power supply distance is adopted to select the method for conductor cross-section to determine feeder line cross section in medium voltage distribution network, wherein, economic load power supply distance refers to when reaching the maximum voltage drop allowable value that electric power enterprise specifies, the maximum distance that can reach when predetermined cross-sectional wire bearing maximum economic load level.Wherein, step S303 is specially: a. is serial according to the conductor cross-section that the distribution network planning Guidance Rule of electric power enterprise is given, calculate the economic load range of harness, that is: in a certain load range, the total cost of certain cross section wire is lower than the expense of other all optional wires, this load range is called the economic load range of this cross section wire, the expense computing formula of wire is as follows:, wherein, for wire total cost, for wire construction cost, comprise initial outlay and labour cost, for the wire wear and tear expense of the 1st year, , wherein, for electricity price, for circuit institute on-load, for line resistance, for circuit rated voltage, for line power factor, for cost coefficient, be multiplied by the present worth that this value can obtain internal loss expense project period, value is generally 0.9%, such as, for 10kV overhead transmission line LGJ model, expense-peak load curve as shown in Figure 2 can be obtained according to the formula in a step, the economic load range that can obtain LGJ model is thus as shown in table 1:
; B. according to the result of calculation in a step, in conjunction with different feeder line institutes on-load capacity, primary election conductor cross-section series, determines the conductor cross-section type of transformer station's output feeder; C. the economic load power supply distance of single conductor cross-section and conductor cross-section series is determined, computing formula is as follows:, wherein, for economic load power supply distance, for electrical network allows maximum pressure drop, be the upper limit of Conductor's Economic load range, such as, still for 10kV overhead transmission line LGJ model, economic load power supply distance as shown in table 2 below can be obtained:
According to every bar feeder line on-load situation, design example system line length is in the scope being not more than economic load power supply distance; D. according to the result of calculation in step c, the verification carrying out under N-1 condition to pressing feeder line cross section in primary election, if do not met N-1 requirement, then adjust conductor cross-section, choose the larger wire in harness middle section or perform step a after installing voltage regulating device or capacitor, and finally determine middle pressure feeder line cross section.
Step S304, construct the medium voltage distribution network example system of objective area according to the main transformer capacity determined, radiant type grid structure and feeder line cross section, on after distributed power source access, quantitative analysis is exactly carried out on the impact of power distribution network according to the medium voltage distribution network example system built to make distribution network planning personnel.
Below in conjunction with embodiment, the method building the medium voltage distribution network example system adapting to distributed power source access is described further, referring to Fig. 3:
Build 10kV medium voltage distribution network example system, wherein 10kV medium voltage distribution network example system comprises 110/10kV main transformer, grid structure and circuit, wherein circuit A and another substation line exist and get in touch with, this interconnector institute on-load is 1MW:(1) selection of main transformer capacity: the maximum supply load of this transformer is 25MW, and therefore 50MVA selected by 110/10kV main transformer; (2) selection of grid structure: issue for 2013 and " the distribution network planning designing technique directive/guide " implemented according to Guo Wang company, when 110kV main transformer capacity is 50MVA, 10kV outgoing line interval is 8 ~ 14, therefore go out number of lines and select 10, the number of lines can be changed according to actual demand, and grid structure takes radiant type; (3) selection of feeder line: calculate for simplifying, design 10kV power distribution network example system 10 returns back out line and is overhead transmission line, and wire type is LGJ, wherein circuit A ~ E is respectively with peak load to be 2MW, circuit F ~ J is respectively with peak load to be 3MW, and according to a step, circuit A ~ E can select 120 mm
2wire, circuit F ~ J can select 185 mm
2wire, consider circuit institute on-load situation according to step c, determine that circuit A ~ E length is 4km, determine that circuit F ~ J length is 3km; (4) N-1 verification: circuit A exists contact, if interconnector transformer station breaks down, need this line load to transfer to main transformer shown in this example system, then circuit A turns on-load is 3MW, and the wire of LGJ120 mm2 can be with peak load to be 6MW, meet N-1 verification; (5) suppose that circuit A ~ J institute on-load is uniformly distributed, and nodes is 5, thus constructs 10kV medium voltage distribution network example system as shown in Figure 4.
Based on the 10kV medium voltage distribution network example system of above-mentioned establishment, after investigation all kinds distributed power source (comprising inverter type, synchronous electric type and asynchronous machine type) accesses power distribution network, on the impact that power distribution network short circuit current produces.Distribution network planning personnel build simulation model according to the above-mentioned 10kV medium voltage distribution network example system provided, and carry out simulation calculation, result of calculation is as shown in table 3:
As shown in Table 3, distributed power source is after access 10kV medium voltage distribution network example system, if concentrate access distributed power source at system head end, when type is synchronous machine, the short circuit current produced key node is maximum.Short circuit current aspect, substation bus bar is the maximum node of out-of-limit possibility, therefore, time when considering distributed power source access on the affecting of system short-circuit electric current, after answering emphasis Computation distribution formula plant-grid connection, when substation bus bar place is short-circuited, to the percussion of system, dynamic and thermal effect check is carried out to substation bus bar and switch simultaneously.
Claims (2)
1. build a method for the medium voltage distribution network example system adapting to distributed power source access, comprise the steps:
According to the peak load of objective area, undertaken determining main transformer capacity by 50% load factor;
Selective radiation formula grid structure is the grid structure of medium voltage distribution network;
Economic load power supply distance is adopted to select the method for conductor cross-section to determine feeder line cross section in medium voltage distribution network, wherein, economic load power supply distance refers to when reaching the maximum voltage drop allowable value that electric power enterprise specifies, the maximum distance that can reach when predetermined cross-sectional wire bearing maximum economic load level;
Construct the medium voltage distribution network example system of objective area according to the main transformer capacity determined, radiant type grid structure and feeder line cross section, on after distributed power source access, quantitative analysis is exactly carried out on the impact of power distribution network according to the medium voltage distribution network example system built to make distribution network planning personnel.
2. the method building the medium voltage distribution network example system adapting to distributed power source access according to claim 1, it is characterized in that: the step of " adopting economic load power supply distance to select the method for conductor cross-section to determine feeder line cross section in medium voltage distribution network " is specially: a. is serial according to the conductor cross-section that the distribution network planning Guidance Rule of electric power enterprise is given, calculate the economic load range of harness, that is: in a certain load range, the total cost of certain cross section wire is lower than the expense of other all optional wires, this load range is called the economic load range of this cross section wire, the expense computing formula of wire is as follows:
Wherein, being wire total cost, is wire construction cost, comprising initial outlay and labour cost, is the wire wear and tear expense of the 1st year, wherein, being electricity price, is circuit institute on-load, for line resistance, for circuit rated voltage, being line power factor, is cost coefficient, be multiplied by the present worth that this value can obtain internal loss expense project period, value is generally 0.9%;
B. according to the result of calculation in a step, in conjunction with different feeder line institutes on-load capacity, primary election conductor cross-section series, determines the conductor cross-section type of transformer station's output feeder;
C. determine the economic load power supply distance of single conductor cross-section and conductor cross-section series, computing formula is as follows:
Wherein, being economic load power supply distance, for electrical network allows maximum pressure drop, is the upper limit of Conductor's Economic load range;
D. according to the result of calculation in step c, the verification carrying out under N-1 condition to pressing feeder line cross section in primary election, if do not met N-1 requirement, then adjust conductor cross-section, choose the larger wire in harness middle section or perform step a after installing voltage regulating device or capacitor, and finally determine middle pressure feeder line cross section.
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| CN105914735A (en) * | 2016-04-29 | 2016-08-31 | 国网辽宁省电力有限公司朝阳供电公司 | Power distribution network economical load flow calculating method |
| CN106296466A (en) * | 2016-08-29 | 2017-01-04 | 中国电力科学研究院 | A kind of feeder system planing method based on reliability |
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| CN103401270A (en) * | 2013-08-13 | 2013-11-20 | 国家电网公司 | Method and device for determining accepting ability of medium and lower voltage distribution network to distributed power sources |
| CN103887792A (en) * | 2014-03-21 | 2014-06-25 | 北京四方继保自动化股份有限公司 | Modeling method of low-voltage distribution network with distributed power supply |
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| CN105914735A (en) * | 2016-04-29 | 2016-08-31 | 国网辽宁省电力有限公司朝阳供电公司 | Power distribution network economical load flow calculating method |
| CN105914735B (en) * | 2016-04-29 | 2018-06-26 | 国网辽宁省电力有限公司朝阳供电公司 | A kind of power distribution network economic load tidal current computing method |
| CN106296466A (en) * | 2016-08-29 | 2017-01-04 | 中国电力科学研究院 | A kind of feeder system planing method based on reliability |
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