CN109599895A - A kind of distributed photovoltaic cut-in method based on clustering - Google Patents
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- H02J3/383—
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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
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- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B10/00—Integration of renewable energy sources in buildings
- Y02B10/10—Photovoltaic [PV]
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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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- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E10/00—Energy generation through renewable energy sources
- Y02E10/50—Photovoltaic [PV] energy
- Y02E10/56—Power conversion systems, e.g. maximum power point trackers
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Abstract
The present invention provides a kind of distributed photovoltaic cut-in method based on clustering, comprising the following steps: S100, is taken photo by plane by satellite and assesses distributed photovoltaic total resources with site inspection, roof is divided into photovoltaic roof and common roof；S200, distributed photovoltaic roof ratio chart is established；S300, clustering is carried out according to distributed photovoltaic roof ratio chart, primarily determines the position of distributed photovoltaic socket points；S400, distributed photovoltaic is fully loaded with to each distributed photovoltaic socket points of access, judge whether the influence of the quality of voltage to power grid, harmonic wave, short circuit current and load factor meets index request, if being unsatisfactory for index request, clustering is re-started, Optimum distribution formula photovoltaic accesses the position of distributed photovoltaic socket points；S500, the actual environment according to scene and geographical assets factor, the final position for determining distributed photovoltaic socket points；S600, distributed photovoltaic is accessed by distributed photovoltaic socket points, so that the access of distributed photovoltaic is safe and reliable.
Description
Technical field
The present invention relates to distributed photovoltaic cut-in method more particularly to a kind of distributed photovoltaic accesses based on clustering
Method.
Background technique
As typical cleaning renewable resource, distributed photovoltaic due to its is resourceful, have a wide range of application the features such as, closely
Development at full speed has been obtained over year.Industrial park good for roof, distributed photovoltaic power generation are even more to receive the investor's
Favor.But large-scale distributed photovoltaic power generation access can be to the side such as Electric Power Network Planning, construction, operation and maintenance and safe and stable operation
Face all generates large effect, how to realize the multiple distributed photovoltaic access work in unified management industrial park, avoids in region
Power grid quality exceeds tolerance range and the unbalanced problem of line load, to promote distributed photovoltaic access to the friend of power grid
Good development is the key that study at present.
Summary of the invention
The purpose of the present invention is to provide a kind of distributed photovoltaic cut-in method based on clustering realizes distributed light
Volt can be accessed safely and reliably.
In order to achieve the above object, the present invention adopts the following technical scheme: a kind of distributed photovoltaic based on clustering
Cut-in method, which comprises the following steps:
S100, it is taken photo by plane by satellite and assesses distributed photovoltaic total resources with site inspection, roof is divided into distributed light
Lie prostrate the common roof that total resources is less than setting value more than or equal to the photovoltaic roof and distributed photovoltaic total resources of setting value；
S200, distributed photovoltaic roof ratio chart is established；
S300, clustering is carried out according to distributed photovoltaic roof ratio chart, primarily determines distributed photovoltaic socket points
Position；
S400, by the fully loaded each distributed photovoltaic socket points of access of distributed photovoltaic, judge the quality of voltage to power grid, humorous
Whether the influence of wave, short circuit current and load factor meets index request, if being unsatisfactory for index request, re-starts clustering,
The position of Optimum distribution formula photovoltaic socket points；
S500, the actual environment according to scene and geographical assets factor, the final position for determining distributed photovoltaic socket points；
S600, distributed photovoltaic is accessed by distributed photovoltaic socket points.
Further, the distributed photovoltaic roof ratio chart in the S200 includes the position and each roof of photovoltaic roof
The distance between.
Further, the clustering uses K- means clustering algorithm, comprising the following steps:
S301, the roof expanse and cluster that cluster is selected according to the distributed photovoltaic access capacity of distributed photovoltaic socket points
Number K；
S302, K cluster is arbitrarily generated, the roof expanse determined in S301 is passed through in the determining cluster of space split plot design
The heart, the cluster centre are the position of distributed photovoltaic socket points.
Further, the space split plot design the following steps are included:
S3021, polygon is constituted in roof expanse；
S3022, the photovoltaic point for the multiple dispersions for including in polygon is divided into multiple triangles, in each triangle
Contain a complete photovoltaic roof；
S3023, center of gravity calculation is carried out to polygon, obtained barycentric coodinates are cluster centre.
Further, the barycentric coodinates G (x of the polygonm, ym) calculation method it is as follows:
Wherein, xmFor the X-coordinate value of barycentric coodinates, ymFor the Y-coordinate value of barycentric coodinates, n is the quantity of triangle, triangle
The barycentric coodinates of shape are Gi(xi, yi)。
Further, the distributed photovoltaic access capacity of the single distributed photovoltaic socket points is 4-6 megawatts.
Further, the index of the quality of voltage is voltage deviation:
Voltage deviation=(virtual voltage-voltage rating)/voltage rating × 100%.
Further, the index of the harmonic wave is allowable harmonic current Ihi:
Wherein, IhiThe h subharmonic current permissible value of points of common connection, S are injected for i-th of userk1For points of common connection
Practical minimum capacity of short circuit, Sk2For benchmark capacity of short circuit, IhpFor h subharmonic current permissible value, SiFor the use of i-th of user
Electric protocol capacity, StFor the system power supply place capacity of points of common connection, a is Phase Stacking system.
Further, the index of the short circuit current is that the exceeded node of short circuit current increases ratio KSC:
Wherein, KSCIncrease ratio for the exceeded node of short circuit current after the fully loaded each distributed photovoltaic socket points of access of distributed photovoltaic
Example, NSCDGIt is more than switch 95% section of rupturing capacity for short circuit current after the fully loaded each distributed photovoltaic socket points of access of distributed photovoltaic
The number of point, NSCIt is more than switch rupturing capacity for short circuit current before the fully loaded each distributed photovoltaic socket points of access of distributed photovoltaic
The number of 95% node, nNODI are the number of a certain voltage class Short-circuit Current of Power Network operator node in region.
Further, the index of the load factor includes line load rate TLWith main transformer load factor TS:
Wherein, TLFor line load rate, PLFor the capacity of trunk of line security current limit, KLIt is fully loaded for distributed photovoltaic
Access route maximum power after each distributed photovoltaic socket points, SLFor the minimum of computation load of route itself；
Wherein, TS is main varying load rate, and PS is main transformer rated capacity, and KS is each distributed light of the fully loaded access of distributed photovoltaic
Caused main transformer maximum power after volt socket points, SS are the minimum of computation load of main transformer itself.
After adopting the above technical scheme, the present invention has the advantage that
The position of distributed photovoltaic socket points is obtained by clustering, and by judging that the fully loaded access of distributed photovoltaic is each
Whether the influence after distributed photovoltaic socket points to the quality of voltage of power grid, harmonic wave, short circuit current and load factor, which meets index, is wanted
It asks, then re-starts clustering if it does not meet the requirements, so that the position of distributed photovoltaic socket points can meet making for power grid
With demand, final distributed photovoltaic socket points are determined with geographical assets factor in the actual conditions by scene, so that distribution
The access of formula photovoltaic is safe and reliable.
Detailed description of the invention
The present invention will be further explained below with reference to the attached drawings:
Fig. 1 is the flow chart of distributed photovoltaic cut-in method of the present invention.
Specific embodiment
The present invention will be further explained below with reference to the attached drawings and specific examples.It is to be appreciated that following "upper",
Indicating positions or the position such as "lower", "left", "right", " longitudinal direction ", " transverse direction ", "inner", "outside", "vertical", "horizontal", "top", "bottom"
The word for setting relationship is based only upon orientation or positional relationship shown in the drawings, only for the purposes of the description present invention and simplifies description, and
It is not that device/element of indication or suggestion meaning must have a particular orientation or be constructed and operated in a specific orientation, therefore
It is not considered as limiting the invention.
As shown in Figure 1, the present invention provides a kind of distributed photovoltaic cut-in method based on clustering, including following step
It is rapid:
S100, it is taken photo by plane by satellite and assesses distributed photovoltaic total resources with site inspection, roof is divided into distributed light
Lie prostrate the common roof that total resources is less than setting value more than or equal to the photovoltaic roof and distributed photovoltaic total resources of setting value；
S200, distributed photovoltaic roof ratio chart is established, distributed photovoltaic roof ratio chart includes the position of photovoltaic roof
The distance between each roof；
S300, clustering is carried out according to distributed photovoltaic roof ratio chart, primarily determines distributed photovoltaic socket points
Position；
S400, by the fully loaded each distributed photovoltaic socket points of access of distributed photovoltaic, judge the quality of voltage to power grid, humorous
Whether the influence of wave, short circuit current and load factor meets index request, if being unsatisfactory for index request, re-starts clustering,
The position of Optimum distribution formula photovoltaic access distributed photovoltaic socket points；
S500, the actual environment according to scene and geographical assets factor, the final position for determining distributed photovoltaic socket points；
S600, distributed photovoltaic is accessed by distributed photovoltaic socket points.
In the present embodiment, setting value is 100 kilowatts, can be to avoid the failure bring pair because of route or distributed photovoltaic
The reliability effect of other systems utmostly realizes the accuracy of prediction.
The appraisal procedure of distributed photovoltaic total resources includes: in S100
S101, using gridding analysis method in distribution network planning, the base of grid dividing foundation in planning for the expansion of power grids
On plinth, in conjunction with photovoltaic property, several adjacent territorial classification grades or are wanted reliability identical or close, roof property
It asks almost the same plot to form one and uses power grid；
S102, it is taken photo by plane and site inspection by carrying out high-precision satellite to selected industry park region, in conjunction with local light
According to radiation condition, existing Roof Resources are analyzed and simulation and forecast one by one, cleithral mountable distribution is showed by survey calculation
The area and mounting condition of formula photovoltaic assess the photovoltaic resources total amount in the case of existing roof；
S103, the planning blank plot for selected assessment area consider the planning vacant lot planning that municipal sector provides, root
Consider that roof area accounts for the 40% of occupied area according to the Experience in Development in mature area, collects local new energy development coefficient assessment
Plan the mountable distributed photovoltaic total capacity on roof；
The photovoltaic resources total amount of S104, integration existing roof and barren ground obtained, obtains the distribution of selected areas
Total resources.
Clustering in S300 uses K- means clustering algorithm, comprising the following steps:
S301, the roof expanse and cluster that cluster is selected according to the distributed photovoltaic access capacity of distributed photovoltaic socket points
Number K；
S302, K cluster is arbitrarily generated, the roof expanse determined in S301 is passed through in the determining cluster of space split plot design
The heart, the cluster centre are the position of distributed photovoltaic socket points.
Space split plot design in S302 specifically includes the following steps:
S3021, polygon is constituted in roof expanse；
S3022, the photovoltaic point for the multiple dispersions for including in polygon is divided into multiple triangles, in each triangle
Contain a complete not divided photovoltaic roof；
S3023, center of gravity calculation is carried out to polygon, obtained barycentric coodinates are cluster centre.
Specifically, in S3023 polygon barycentric coodinates G (xm, ym) calculation method it is as follows:
Wherein, xmFor the X-coordinate value of barycentric coodinates, ymFor the Y-coordinate value of barycentric coodinates, n is the quantity of triangle, triangle
The barycentric coodinates of shape are Gi(xi, yi)。
In the present embodiment, in order to avoid the failure bring because of route or distributed photovoltaic is to the reliability of other systems
It influences, utmostly realizes the validity of distributed photovoltaic socket points, the distributed photovoltaic of single distributed photovoltaic socket points connects
The total capacity for the photovoltaic roof for including in the roof expanse for entering total capacity in 4-6 megawatt range, therefore selecting is in 4-6 megawatt range
It is interior.
The index of quality of voltage is voltage deviation in S400:
Voltage deviation (%)=(virtual voltage-voltage rating)/voltage rating × 100%.
" power quality admissible deviation of supply volt- age " (GB12325-2008) under normal operating conditions, uses electric system
The tolerance of family receiving end supply voltage is provided: 10kV and following three phase supply voltage deviation be nominal voltage ±
7%.
The index of harmonic wave is allowable harmonic current I in S400hi:
Wherein, IhiThe h subharmonic current permissible value of points of common connection, S are injected for i-th of userk1For points of common connection
Practical minimum capacity of short circuit, Sk2For benchmark capacity of short circuit, IhpFor h subharmonic current permissible value, SiFor the use of i-th of user
Electric protocol capacity, StFor the system power supply place capacity of points of common connection, a is Phase Stacking system.
10 kv grid voltage total harmonic distortion factors are provided in " power quality utility network harmonic wave " (GB/T14549-93)
No more than 4.0%, odd harmonic voltage containing ratio is no more than 3.2%, and even harmonic voltages containing ratio is no more than 1.6%.
The index of S400 short circuit currents is that the exceeded node of short circuit current increases ratio KSC:
Wherein, KSCIncrease ratio for the exceeded node of short circuit current after the fully loaded each distributed photovoltaic socket points of access of distributed photovoltaic
Example, NSCDGIt is more than switch 95% section of rupturing capacity for short circuit current after the fully loaded each distributed photovoltaic socket points of access of distributed photovoltaic
The number of point, NSCIt is more than switch rupturing capacity for short circuit current before the fully loaded each distributed photovoltaic socket points of access of distributed photovoltaic
The number of 95% node, nNODI are the number of a certain voltage class Short-circuit Current of Power Network operator node in region.
The calculating of short circuit current only considers that distributed photovoltaic influences 10 kilovolts of buses three of most serious on grid short circuit electric current
The influence of phase short circuit operation mode.Distributed photovoltaic access power grid causes the short circuit current level of bus in substation to be not to be exceeded
16-25kA。
The index of load factor includes line load rate T in S400LWith main transformer load factor TS:
Wherein, TLFor line load rate, PLFor the capacity of trunk of line security current limit, KLIt is fully loaded for distributed photovoltaic
Access route maximum power after each distributed photovoltaic socket points, SLFor the minimum of computation load of route itself；
Wherein, TS is main varying load rate, and PS is main transformer rated capacity, and KS is each distributed light of the fully loaded access of distributed photovoltaic
Caused main transformer maximum power after volt socket points, SS are the minimum of computation load of main transformer itself.
Line load rate and main transformer load factor after distributed photovoltaic access power grid should all be no more than safe capacity.
If distributed photovoltaic socket points is unsatisfactory for These parameters requirement, roof expanse is adjusted, center of gravity calculation is re-started,
New distributed photovoltaic socket points are obtained, are judged again, until meeting index request.
Distributed photovoltaic socket points use ring network cabinet inlet-outlet line, and in order to which rational deployment builds ring network cabinet, S500 passes through selected
The actual field of net region is reconnoitred, and according to factors such as the actual environment at scene, geographical assets, judges the distribution of selection
Whether photovoltaic socket points, which have ready conditions, is built, if condition is suitable, which is point finally determined
Cloth photovoltaic socket points；If selected distributed photovoltaic socket points are located at the place of the unsuitable construction such as road, river, according to
Field experience slightly adjusts the position of distributed photovoltaic socket points, makes it suitable for the construction of distributed photovoltaic socket points.
In addition to above preferred embodiment, there are other embodiments of the invention, and those skilled in the art can be according to this
Invention makes various changes and modifications, and as long as it does not depart from the spirit of the invention, should belong to appended claims of the present invention and determines
The range of justice.
Claims (10)
1. a kind of distributed photovoltaic cut-in method based on clustering, which comprises the following steps:
S100, it is taken photo by plane by satellite and assesses distributed photovoltaic total resources with site inspection, roof is divided into distributed photovoltaic money
Source total amount is less than the common roof of setting value more than or equal to the photovoltaic roof and distributed photovoltaic total resources of setting value；
S200, distributed photovoltaic roof ratio chart is established；
S300, clustering is carried out according to distributed photovoltaic roof ratio chart, primarily determines the position of distributed photovoltaic socket points；
S400, by the fully loaded each distributed photovoltaic socket points of access of distributed photovoltaic, judge the quality of voltage to power grid, harmonic wave, short
Whether the influence of road electric current and load factor meets index request, if being unsatisfactory for index request, re-starts clustering, optimization point
The position of cloth photovoltaic socket points；
S500, the actual environment according to scene and geographical assets factor, the final position for determining distributed photovoltaic socket points；
S600, distributed photovoltaic is accessed by distributed photovoltaic socket points.
2. distributed photovoltaic cut-in method according to claim 1, which is characterized in that the distributed photovoltaic in the S200
Roof ratio chart includes the position and the distance between each roof of photovoltaic roof.
3. distributed photovoltaic cut-in method according to claim 1, which is characterized in that the clustering uses K- mean value
Clustering algorithm, comprising the following steps:
Of S301, the roof expanse that cluster is selected according to the distributed photovoltaic access capacity of distributed photovoltaic socket points and cluster
Number K；
K S302, any generation cluster, determine cluster centre by space split plot design to the roof expanse determined in S301, should
Cluster centre is the position of distributed photovoltaic socket points.
4. distributed photovoltaic cut-in method according to claim 3, which is characterized in that the space split plot design includes following
Step:
S3021, polygon is constituted in roof expanse；
S3022, the photovoltaic point for the multiple dispersions for including in polygon is divided into multiple triangles, contained in each triangle
One complete photovoltaic roof；
S3023, center of gravity calculation is carried out to polygon, obtained barycentric coodinates are cluster centre.
5. distributed photovoltaic cut-in method according to claim 4, which is characterized in that the barycentric coodinates G of the polygon
(xm, ym) calculation method it is as follows:
Wherein, xmFor the X-coordinate value of barycentric coodinates, ymFor the Y-coordinate value of barycentric coodinates, n is the quantity of triangle, triangle
Barycentric coodinates are Gi(xi, yi)。
6. distributed photovoltaic cut-in method according to claim 3, which is characterized in that the single distributed photovoltaic socket
The distributed photovoltaic access capacity of point is 4-6 megawatts.
7. distributed photovoltaic cut-in method according to claim 1, which is characterized in that the index of the quality of voltage is electricity
Press deviation:
Voltage deviation=(virtual voltage-voltage rating)/voltage rating × 100%.
8. distributed photovoltaic cut-in method according to claim 1, which is characterized in that the index of the harmonic wave is harmonic wave electricity
Flow permissible value Ihi:
Wherein, IhiThe h subharmonic current permissible value of points of common connection, S are injected for i-th of userk1For the reality of points of common connection
Border minimum capacity of short circuit, Sk2For benchmark capacity of short circuit, IhpFor h subharmonic current permissible value, SiFor the electricity consumption association of i-th of user
Discuss capacity, StFor the system power supply place capacity of points of common connection, a is Phase Stacking system.
9. distributed photovoltaic cut-in method according to claim 1, which is characterized in that the index of the short circuit current is short
Electric current exceeded node in road increases ratio KSC:
Wherein, KSCIncrease ratio for the exceeded node of short circuit current after the fully loaded each distributed photovoltaic socket points of access of distributed photovoltaic,
NSCDGIt is more than switch 95% node of rupturing capacity for short circuit current after the fully loaded each distributed photovoltaic socket points of access of distributed photovoltaic
Number, NSCIt is more than switch rupturing capacity 95% for short circuit current before the fully loaded each distributed photovoltaic socket points of access of distributed photovoltaic
The number of node, nNODI are the number of a certain voltage class Short-circuit Current of Power Network operator node in region.
10. distributed photovoltaic cut-in method according to claim 1, which is characterized in that the index of the load factor includes
Line load rate TLWith main transformer load factor TS:
Wherein, TLFor line load rate, PLFor the capacity of trunk of line security current limit, KLFor the fully loaded access of distributed photovoltaic
Route maximum power after each distributed photovoltaic socket points, SLFor the minimum of computation load of route itself；
Wherein, TS is main varying load rate, and PS is main transformer rated capacity, and KS is that the fully loaded each distributed photovoltaic of access of distributed photovoltaic is inserted
Caused main transformer maximum power after seat point, SS are the minimum of computation load of main transformer itself.
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| CN115622122A (en) * | 2022-10-14 | 2023-01-17 | 国网河北省电力有限公司营销服务中心 | Distributed photovoltaic power distribution network access method |
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