CN110365054A - Distributed generation resource maximum penetration level calculation method for rural power grids - Google Patents
Distributed generation resource maximum penetration level calculation method for rural power grids Download PDFInfo
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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
- H02J3/38—Arrangements for parallely feeding a single network by two or more generators, converters or transformers
- H02J3/381—Dispersed generators
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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
The invention discloses a kind of distributed generation resource maximum penetration level calculation methods for rural power grids, the power supply structure of the rural power grids including analyzing region to be analyzed；If single supply irradiation structure, then the maximum apparent energy of zoning internal loading and the maximum penetration level of regional power grid to be analyzed is calculated；Structure is got in touch with hand in hand if dual power supply, it is then by boundary of interconnection switch that two sections of feeder lines of fanout operation are whole as two independent regional power grids, calculate the maximum penetration level that each regional power grid allows to allow to access total score cloth power supply on the distributed generation resource maximum penetration level and feeder line that access；It finally adjusts the distributed generation resource maximum penetration level that each regional power grid allows to access and meets limitation requirement.Calculation method of the present invention realizes that simply the data information amount needed is few, application easy to spread, and high reliablity, accuracy are good and scientific and reasonable.
Description
Technical field
Present invention relates particularly to a kind of distributed generation resource maximum penetration level calculation methods for rural power grids.
Background technique
Electric energy has become essential secondary energy sources in people's production and life, gives people's production and life band
Endless convenience is carried out.In recent years, with the continuous failure of traditional fossil energy, photovoltaic, wind-powered electricity generation, biomass power generation distributed
Power supply is increasingly valued by people.
Photovoltaic, wind-powered electricity generation, biomass distributed power supply present in rural area fast development and concentrate exploitation, resident in flakes
The situation of the comprehensive propulsion of sporadic development and rural area.Rural power grids are in power grid end, and electric network composition is weak, mostly single electricity
Source radiation structure or dual power supply get in touch with hand in hand structure, and electricity consumption is seasonal strong, and load fluctuation is big, as distributed generation resource is in rural area
Power grid permeability steps up, and the weak electrical characteristic of rural power grids is more complicated and changeable, power supply quality to rural power grids and steady
It is qualitative to bring lot of challenges.
Carry out the preconsolidation stress technique study of rural power grids distributed generation resource maximum penetration level for grasping rural power grids
Digestion capability, carry out reasonable distributed generation resource and net layout have important practical significance.Domestic and foreign scholars are to distribution
The critical accounting of power supply has carried out correlative study, however existing research achievement is for power distribution network distributed generation resource allowed capacity
Research, mainly considers specific grid structure and various safe and stable operation constraint conditions, final acquisition distributed generation resource
Installation site and installed capacity, belonging to the grid-connected design phase needs emphasis to consider the problems of.Emphasis solution is needed when planning early period
Certainly the problem of is to grasp regional power grid from macroscopically determining that regional power grid receives the limit of distributed generation resource capacity and receive distribution
The remaining space of power supply, to effectively instruct the orderly access of distributed generation resource during planning construction.
Entitled " the grid-connected digestion capability analysis of regional distribution network distributed photovoltaic based on permeability " (electric system is automatic
Change, 2017 (14): the 105-111 pages) propose that the method for planning capacity based on permeability index group, this article think capacity permeability
The degree of saturation of regional distribution network photovoltaic installed capacity is embodied, when capacity permeability is more than 100%, it is meant that if continued
Increase photovoltaic installed capacity, necessarily will appear the period that photo-voltaic power supply can not be dissolved by local load in regional distribution network, therefore
This article is using capacity permeability as the photovoltaic installed capacity limit in regional distribution network.Although there can be reversal tidal current, function is sent
As long as rate is no more than the overload capacity of route or equipment, still it can receive, therefore the estimation method is relatively conservative, will cause pole
Limited capacity amount is underestimated.
Summary of the invention
The purpose of the present invention is to provide good and scientific and reasonable points for rural power grids of a kind of high reliablity, accuracy
Cloth power supply maximum penetration level calculation method.
This distributed generation resource maximum penetration level calculation method for rural power grids provided by the invention, including it is as follows
Step:
S1. it analyzes the power supply structure of the rural power grids in region to be analyzed: handing in hand for single supply irradiation structure or dual power supply
Get in touch with structure；
If S2. the power supply structure of the rural power grids in region to be analyzed is single supply irradiation structure, according to the history of power grid
The maximum apparent energy of data zoning internal loading；
S3. the distribution of regional power grid to be analyzed is calculated in conjunction with the historical data of power grid according to the calculated result of step S2
Formula power supply maximum penetration level；
If S4. the power supply structure of the rural power grids in region to be analyzed is that dual power supply gets in touch with hand in hand structure, opened with contact
Closing is boundary, whole using two sections of feeder lines of fanout operation as two independent regional power grids, further according to each region power grid
Historical data, calculate each region power grid allow access distributed generation resource maximum penetration level；
S5. according to the historical data of each region power grid, being calculated under standby operation mode on feeder line allows to access always
The maximum penetration level of distributed generation resource；
S6. according to the calculated result of step S5, the distributed generation resource maximum access that single regional power grid allows to access is adjusted
Capacity, the maximum penetration level limitation for being allowed to meet total score cloth power supply requires, to obtain the distribution of regional power grid to be analyzed
Formula power supply maximum penetration level.
According to the maximum apparent energy of the historical data zoning internal loading of power grid described in step S2, specially use
The maximum apparent energy S of following formula zoning internal loadingcon,max:
P in formulacon,maxFor the active power at regional power grid internal loading maximum moment, Qcon,maxMost for regional power grid internal loading
The reactive power at big moment.
The maximum penetration level of the rural power grids in calculating region to be analyzed, specially uses following formula described in step S3
Calculate the maximum penetration level P of the rural power grids in region to be analyzedgen,max:
P in formulacon,minFor the active power of regional power grid internal loading minimal instant, Qcon,minMost for regional power grid internal loading
The reactive power at small moment, Scon,maxFor the maximum apparent energy of regional power grid internal loading.
The distributed generation resource maximum penetration level that calculating each region power grid allows to access described in step S4, is specially adopted
The distributed generation resource maximum penetration level P that each region power grid allows to access is calculated with following formulagen1,maxAnd Pgen2,max:
P in formulacon1,minFor the active power of the load minimal instant of regional power grid 1, Pcon1,maxFor the negative of regional power grid 1
The active power at lotus maximum moment, Qcon1,maxFor the reactive power at the load maximum moment of regional power grid 1, Qcon1,minFor region
The reactive power of the load minimal instant of power grid 1；Pcon2,minFor the active power of the load minimal instant of regional power grid 2,
Pcon2,maxFor the active power at the load maximum moment of regional power grid 2, Qcon2,maxFor load maximum moment of regional power grid 2
Reactive power, Qcon2,minFor the reactive power of the load minimal instant of regional power grid 2.
The maximum penetration level for allowing to access total score cloth power supply is calculated on feeder line described in step S5, specially adopts
The maximum penetration level for allowing to access total score cloth power supply on feeder line is calculated with following formula:
P in formulagen1,maxAllow the distributed generation resource maximum penetration level accessed, P for regional power grid 1gen2,maxFor region electricity
Net 2 allows the distributed generation resource maximum penetration level accessed, (Pcon1+Pcon2)minFor 2 total load of regional power grid 1 and regional power grid
The active power of minimal instant, (Qcon1+Qcon2)minFor the idle function of 2 total load minimal instant of regional power grid 1 and regional power grid
Rate, Ssum,maxFor the maximum apparent energy of 2 total load of regional power grid 1 and regional power grid.
This distributed generation resource maximum penetration level calculation method for rural power grids provided by the invention, by villages and small towns area
Domain power grid research object as a whole, to overload the rigid restrictive condition accessed as distributed generation resource, in conjunction with single radial pattern knot
It is maximum quasi- to propose distributed generation resource under two kinds of power supply modes for structure and the operation characteristic for getting in touch with two kinds of power supply modes of structure hand in hand
Enter capacity calculation methods, which realizes that simply the data information amount needed is few, application easy to spread, and reliability
Height, accuracy are good and scientific and reasonable.
Detailed description of the invention
Fig. 1 is the method flow schematic diagram of the method for the present invention.
Fig. 2 is the electrical schematic of the single supply irradiation structure in the method for the present invention.
Fig. 3 hands in hand for the dual power supply in the method for the present invention gets in touch with the electrical schematic of structure.
Specific embodiment
It is as shown in Figure 1 the method flow schematic diagram of the method for the present invention: provided by the invention this for rural power grids
Distributed generation resource maximum penetration level calculation method, includes the following steps:
S1. it analyzes the power supply structure of the rural power grids in region to be analyzed: handing in hand for single supply irradiation structure or dual power supply
Get in touch with structure；
Single supply irradiation structure, the structure are usually powered by single supply, can be equivalent to entire radial pattern regional distribution network
Integral load, electrical schematic are as shown in Figure 2；
Dual power supply gets in touch with hand in hand structure, although which is duplicate supply looped network structure, but comes according to radial structure
Operation, wherein double-fed line mutual backup, load power supply reliability, electrical schematic such as Fig. 3 institute are improved by interconnection switch
Show；
If system is single supply irradiation structure, steps are as follows for calculating:
If S2. the power supply structure of the rural power grids in region to be analyzed is single supply irradiation structure, according to the history of power grid
The maximum apparent energy of data zoning internal loading；Specially using the maximum view of following formula zoning internal loading in function
Rate Scon,max:
P in formulacon,maxFor the active power at regional power grid internal loading maximum moment, Qcon,maxMost for regional power grid internal loading
The reactive power at big moment；
S3. the rural power grids in region to be analyzed are calculated in conjunction with the historical data of power grid according to the calculated result of step S2
Maximum penetration level；The maximum penetration level of the rural power grids in region to be analyzed is specially calculated using following formula
Pgen,max:
P in formulacon,minFor the active power of regional power grid internal loading minimal instant, Qcon,minMost for regional power grid internal loading
The reactive power at small moment, Scon,maxFor the maximum apparent energy of regional power grid internal loading；
In the specific implementation: assuming that electricity consumption apparent energy total in region is Scon, wherein active power and reactive power are divided
It Wei not PconAnd Qcon.Assume that distributed power generation power is P in region simultaneouslygen, ignore distributed power generation transmission loss, then single electricity
Source stream is to the trend of regional power grid
Before introducing distributed generation resource, equipment and route are usually that will not overload, and strength of current appears in load at this time
Maximum moment, maximum apparent energy are represented by
In formula, Pcon,maxAnd Qcon,maxThe respectively active power and reactive power at regional power grid internal loading maximum moment.When
A large amount of distributed generation units are connected in regional distribution network, since distributed power generation is reversal tidal current, when distributed generation resource is contributed
When maximum and power load minimum, reversal tidal current reaches maximum, then the strength of current after accessing distributed distributed generation resource is
In above formula, Pcon,minAnd Qcon,minThe respectively active power and reactive power of regional power grid internal loading minimal instant.
After accessing distributed generation resource, as long as the strength of current after access is smaller than the strength of current before access, overload situations would not occur,
Should it meet
Smax≤Scon,max
Available following condition
Meanwhile if system is that dual power supply gets in touch with hand in hand structure, steps are as follows for calculating:
If S4. the power supply structure of the rural power grids in region to be analyzed is that dual power supply gets in touch with hand in hand structure, opened with contact
Closing is boundary, whole using two sections of feeder lines of fanout operation as two independent regional power grids, further according to each region power grid
Historical data, calculate each region power grid allow access distributed generation resource maximum penetration level；Specially calculated using following
Formula calculates the distributed generation resource maximum penetration level P that each region power grid allows to accessgen1,maxAnd Pgen2,max:
P in formulacon1,minFor the active power of the load minimal instant of regional power grid 1, Pcon1,maxFor the negative of regional power grid 1
The active power at lotus maximum moment, Qcon1,maxFor the reactive power at the load maximum moment of regional power grid 1, Qcon1,minFor region
The reactive power of the load minimal instant of power grid 1；Pcon2,minFor the active power of the load minimal instant of regional power grid 2,
Pcon2,maxFor the active power at the load maximum moment of regional power grid 2, Qcon2,maxFor load maximum moment of regional power grid 2
Reactive power, Qcon2,minFor the reactive power of the load minimal instant of regional power grid 2；
S5. according to the historical data of each region power grid, being calculated under standby operation mode on feeder line allows to access always
The maximum penetration level of distributed generation resource；Specially being calculated using following formula allows to access total score cloth power supply most on feeder line
Big allowed capacity:
P in formulagen1,maxAllow the distributed generation resource maximum penetration level accessed, P for regional power grid 1gen2,maxFor region electricity
Net 2 allows the distributed generation resource maximum penetration level accessed, (Pcon1+Pcon2)minFor 2 total load of regional power grid 1 and regional power grid
The active power of minimal instant, (Qcon1+Qcon2)minFor the idle function of 2 total load minimal instant of regional power grid 1 and regional power grid
Rate, Ssum,maxFor the maximum apparent energy of 2 total load of regional power grid 1 and regional power grid；
S6. according to the calculated result of step S5, the distributed generation resource maximum access that single regional power grid allows to access is adjusted
Capacity, the maximum penetration level limitation for being allowed to meet total score cloth power supply requires, to obtain the rural power grids in region to be analyzed
Maximum penetration level；
In the specific implementation, using interconnection switch as boundary, using two sections of feeder lines of fanout operation as two independent areas
Domain power grid is whole, as a result, can be with according to the above analysis to guarantee that two sections of feeder zone all avoid overloading after distributed generation resource access
The distributed generation resource maximum penetration level for obtaining accessing on two sections of feeder zone should meet respectively
In formula: Pcon1,min、Qcon1,min、Pcon1,maxAnd Qcon1,maxThe respectively 1 load minimum and maximum moment pair of regional power grid
The active power and reactive power answered, Pcon2,min、Qcon2,min、Pcon2maxAnd Qcon2,maxRespectively 2 load minimum of regional power grid and
Maximum moment corresponding active power and reactive power；
In standby operation mode, the load of two sections of feeder lines is by same power supply power supply, so distributed generation resource and load are
The sum of two sections of feeder lines, in order to guarantee that overload situations, the maximum access of two sections of feeder line total score cloth power supplys does not also occur in spare period
Capacity also needs to meet
(P in formulagen1+Pgen2)maxAllow the total score cloth power supply maximum access accessed for regional power grid 1 and regional power grid 2
Capacity, (Pcon1+Pcon2)minFor the active power of 2 total load minimal instant of regional power grid 1 and regional power grid, (Qcon1+Qcon2)min
For the reactive power of 2 total load minimal instant of regional power grid 1 and regional power grid, Ssum,maxIt is total for regional power grid 1 and regional power grid 2
The maximum apparent energy of load；
And in the same area, the maximum output moment of distributed power generation is almost the same, can be approximately considered
(Pgen1+Pgen2)max=Pgen1,max+Pgen2,max
It is available:
Therefore hand in hand in contact power supply structure, in addition to guaranteeing that overload fault does not occur, should also protect under normal operation mode
Transmission capacity under standby operation mode is demonstrate,proved to carry in range.
Below in conjunction with one embodiment, the method for the present invention is further described:
By taking 10 kilovolts of certain village domain power distribution network hand in hand contact power supply structure as an example, using the distributed generation resource of this patent proposition
Maximum penetration level planing method is carried out photovoltaic maximum penetration level and is calculated, which includes two sections of feeder lines, wherein
Feeder line 1 has 3 load points, and feeder line 2 has 2 load points, interconnection switch is arranged between feeder line 1 and feeder line 2.Collect source side flow direction
Nearly 1 year load uncertainty data on single hop feeder line, statistics obtain the minimum and maximum power parameter of single hop feeder zone internal loading,
Two sections of feeder line flow datas are superimposed to obtain nearly 1 year total load uncertainty data on feeder line simultaneously, statistics obtains feeder line total load
Minimum and maximum power parameter, relevant parameter is as shown in the table:
1 parameter schematic table of table
| Parameter name | Feeder line 1 | Feeder line 2 | Feeder line total load |
| Maximum active power | 9.8MW | 6.5MW | 15.4MW |
| Maximum reactive power | 2Mvar | 1.6Mvar | 2.7Mvar |
| Minimum active power | 2.1MW | 1.8MW | 4.3MW |
| Minimum reactive power | 900kvar | 600kvar | 1.9Mvar |
According to load parameter shown in upper table, the photo-voltaic power supply maximum access for allowing to access on feeder line 1 and feeder line 2 can be calculated
Capacity is respectively
Pgen1,max< 12.06MW
Pgen2,max< 8.46MW
In standby mode, the maximum penetration level of total photo-voltaic power supply needs to meet
Pgen1,max+Pgen2,max< 19.8MW
Since above-mentioned condition is both needed to meet, the photo-voltaic power supply for allowing to access on adjustable feeder line 1 and feeder line 2 is maximum
Allowed capacity can plan that the maximum penetration level of feeder line 1 and feeder line 2 is respectively 12MW and 7.8MW.
Support of the application by Hunan Province's Natural Science Fund In The Light youth project (2019JJ50006).
Claims (5)
1. a kind of distributed generation resource maximum penetration level calculation method for rural power grids, includes the following steps:
S1. it analyzes the power supply structure of the rural power grids in region to be analyzed: being got in touch with hand in hand for single supply irradiation structure or dual power supply
Structure；
If S2. the power supply structure of the rural power grids in region to be analyzed is single supply irradiation structure, according to the historical data of power grid
The maximum apparent energy of zoning internal loading；
S3. the distributed electrical of regional power grid to be analyzed is calculated in conjunction with the historical data of power grid according to the calculated result of step S2
Source maximum penetration level；
If S4. the power supply structure of the rural power grids in region to be analyzed is that dual power supply gets in touch with hand in hand structure, it is with interconnection switch
Boundary, it is whole using two sections of feeder lines of fanout operation as two independent regional power grids, further according to going through for each region power grid
History data calculate the distributed generation resource maximum penetration level that each region power grid allows to access；
S5. according to the historical data of each region power grid, being calculated under standby operation mode on feeder line allows to access total distributed
The maximum penetration level of formula power supply；
S6. according to the calculated result of step S5, the distributed generation resource maximum penetration level that single regional power grid allows to access is adjusted,
The maximum penetration level limitation for being allowed to meet total score cloth power supply requires, to obtain the distributed generation resource of regional power grid to be analyzed
Maximum penetration level.
2. the distributed generation resource maximum penetration level calculation method according to claim 1 for rural power grids, feature
It is according to the maximum apparent energy of the historical data zoning internal loading of power grid described in step S2, specially using as follows
The maximum apparent energy S of formula zoning internal loadingcon,max:
P in formulacon,maxFor the active power at electricity consumption moment maximum in region, Qcon,maxFor the presence or absence of electricity consumption moment maximum in region
Function power.
3. the distributed generation resource maximum penetration level calculation method according to claim 2 for rural power grids, feature
It is the maximum penetration level of the rural power grids in calculating region to be analyzed described in step S3, is specially calculated using following formula
The maximum penetration level P of the rural power grids in region to be analyzedgen,max:
P in formulacon,minFor the active power of regional power grid internal loading minimal instant, Qcon,minWhen for regional power grid internal loading minimum
The reactive power at quarter, Scon,maxFor the maximum apparent energy of regional power grid internal loading.
4. the distributed generation resource maximum penetration level calculation method of rural power grids is used for described according to claim 1~one of 3,
It is characterized in that the distributed generation resource maximum penetration level that calculating each region power grid allows to access described in step S4, specially
The distributed generation resource maximum penetration level P that each region power grid allows to access is calculated using following formulagen1,maxAnd Pgen2,max:
P in formulacon1,minFor the active power of the load minimal instant of regional power grid 1, Pcon1,maxIt is maximum for the load of regional power grid 1
The active power at moment, Qcon1,maxFor the reactive power at the load maximum moment of regional power grid 1, Qcon1,minFor regional power grid 1
The reactive power of load minimal instant；Pcon2,minFor the active power of the load minimal instant of regional power grid 2, Pcon2,maxFor area
The active power at the load of domain power grid 2 maximum moment, Qcon2,maxFor the reactive power at the load maximum moment of regional power grid 2,
Qcon2,minFor the reactive power of the load minimal instant of regional power grid 2.
5. the distributed generation resource maximum penetration level calculation method according to claim 4 for rural power grids, feature
It is that the maximum penetration level for allowing to access total score cloth power supply is calculated on feeder line described in step S5, specially using such as
Lower formula calculates the maximum penetration level for allowing to access total score cloth power supply on feeder line:
P in formulagen1,maxAllow the distributed generation resource maximum penetration level accessed, P for regional power grid 1gen2,maxPermit for regional power grid 2
Perhaps the distributed generation resource maximum penetration level accessed, (Pcon1+Pcon2)minWhen for 2 total load minimum of regional power grid 1 and regional power grid
The active power at quarter, (Qcon1+Qcon2)minFor the reactive power of 2 total load minimal instant of regional power grid 1 and regional power grid,
Ssum,maxFor the maximum apparent energy of 2 total load of regional power grid 1 and regional power grid.
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