CN114977323A - Method and system for measuring and calculating photovoltaic project access capacity of distribution network area - Google Patents

Method and system for measuring and calculating photovoltaic project access capacity of distribution network area Download PDF

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Publication number
CN114977323A
CN114977323A CN202210668386.8A CN202210668386A CN114977323A CN 114977323 A CN114977323 A CN 114977323A CN 202210668386 A CN202210668386 A CN 202210668386A CN 114977323 A CN114977323 A CN 114977323A
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photovoltaic
area
distribution
capacity
transformer
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王小虎
罗宗杰
戴乔旭
陈臻
张华煜
高天舒
符方炫
余声望
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Guangdong Power Grid Co Ltd
Zhanjiang Power Supply Bureau of Guangdong Power Grid Co Ltd
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Guangdong Power Grid Co Ltd
Zhanjiang Power Supply Bureau of Guangdong Power Grid Co Ltd
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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
    • H02J3/46—Controlling of the sharing of output between the generators, converters, or transformers
    • H02J3/466—Scheduling the operation of the generators, e.g. connecting or disconnecting generators to meet a given demand
    • 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
    • H02J3/004—Generation forecast, e.g. methods or systems for forecasting future energy generation
    • 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
    • H02J2300/00—Systems for supplying or distributing electric power characterised by decentralized, dispersed, or local generation
    • H02J2300/20—The dispersed energy generation being of renewable origin
    • H02J2300/22—The renewable source being solar energy
    • H02J2300/24—The renewable source being solar energy of photovoltaic origin
    • 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
    • Y04—INFORMATION OR COMMUNICATION TECHNOLOGIES HAVING AN IMPACT ON OTHER TECHNOLOGY AREAS
    • Y04S—SYSTEMS INTEGRATING TECHNOLOGIES RELATED TO POWER NETWORK OPERATION, COMMUNICATION OR INFORMATION TECHNOLOGIES FOR IMPROVING THE ELECTRICAL POWER GENERATION, TRANSMISSION, DISTRIBUTION, MANAGEMENT OR USAGE, i.e. SMART GRIDS
    • Y04S10/00—Systems supporting electrical power generation, transmission or distribution
    • Y04S10/50—Systems or methods supporting the power network operation or management, involving a certain degree of interaction with the load-side end user applications

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Supply And Distribution Of Alternating Current (AREA)

Abstract

The invention provides a method and a system for measuring and calculating photovoltaic project access capacity of a distribution network area, wherein the method comprises the steps of selecting an optimal area group meeting photovoltaic local consumption conditions according to the accumulated transmission electric quantity of photovoltaic effective power generation time of distribution changes of each area in a random day; calculating according to the distribution transformer highest load rate array to obtain a recommended installation photovoltaic capacity array; and calculating the photovoltaic suggested installation capacity meeting the load requirement by adopting an approximation algorithm according to the electricity selling income of the distribution area and the photovoltaic cost. According to the method, the distribution area suitable for installing the distributed photovoltaic is more accurately determined by selecting the distribution area suitable for installing the distributed photovoltaic and combining the actual situation of the distribution area to calculate the recommended access capacity, so that the operation pressure and the line loss of the power distribution network are reduced.

Description

Method and system for measuring and calculating photovoltaic project access capacity of distribution network area
Technical Field
The invention belongs to the technical field of power grid control, and particularly relates to a method and a system for measuring and calculating photovoltaic project access capacity of a distribution network area.
Background
Along with the continuous development of whole county photovoltaic pilot point work, there is the distributed photovoltaic access constantly on rural distribution network low pressure platform district side. The transformer area is connected with photovoltaic capacity and position, the operation level of equipment such as distribution transformer and low-voltage wires of the transformer area is influenced, and the consumption condition of photovoltaic development and power generation is determined, so that the economic investment of a photovoltaic development project is influenced to a certain extent. The existing method for measuring and calculating the capacity of a photovoltaic access transformer area is mainly used for estimating the photovoltaic access capacity according to the capacity of transformer distribution of the transformer area, so that the total power of photovoltaic power generation does not exceed the total power of the transformer distribution.
However, in the existing method, the maximum installed capacity is sought simply from the consideration of a photovoltaic investment developer, and the photovoltaic capacity is not selectively accessed according to the actual load operation level of a distribution network distribution area, so that the photovoltaic power generation of a part of distribution areas cannot be effectively consumed on the spot, although the problem of heavy overload of outgoing line equipment in the distribution and transformation uploading process cannot be caused, the loss of the distribution areas, medium-voltage lines and other equipment is increased, and the method does not have good economy.
Disclosure of Invention
In view of the above, the invention aims to solve the problem that the photovoltaic access capacity estimated by the existing measurement and calculation method increases the loss of equipment such as a transformer area and a medium-voltage line, and has no good economy.
In order to solve the technical problems, the invention provides the following technical scheme:
in a first aspect, the invention provides a method for measuring and calculating the photovoltaic project access capacity of a distribution network area, which comprises the following steps:
collecting output electric quantity data of distribution transformers of each area and calculating the accumulated transmission electric quantity of the distribution transformers in the photovoltaic effective power generation time within a random day;
selecting a station area meeting photovoltaic local consumption conditions according to the accumulated electric quantity to form an optimal station area group;
the method comprises the steps that an accumulated output electric quantity array and a distribution transformer highest load rate array of a preferred station group in a set time range in the photovoltaic effective power generation time every day are correlated, and a recommended installation photovoltaic capacity array is obtained through calculation according to the distribution transformer highest load rate array;
and calculating the photovoltaic suggested installation capacity meeting the load requirement by adopting an approximation algorithm for the accumulative output electric quantity array and the suggested installation photovoltaic capacity array according to the power selling income of the distribution area and the photovoltaic cost.
Further, according to the accumulated transmission electric quantity, a station area meeting the photovoltaic local consumption condition is selected to form an optimal station area group, and the method specifically comprises the following steps:
determining the condition W suitable for photovoltaic access of the transformer area according to the operation requirement of the distribution transformer 1 /(S 0 *a*b)>N set Wherein W is 1 For cumulative delivery of electric power, S 0 For the rated capacity of the distribution transformer, a is the heavy-load operating condition of the distribution transformer, b is the full-time-domain duration, N set Is a set value;
and screening according to the distribution and transformation rated capacity of the accumulated transmission electric quantity of each station area on random days, and forming the station areas meeting the conditions into an optimal station area group.
Further, the recommended installation photovoltaic capacity array obtained by calculation according to the distribution transformer highest load rate array is specifically calculated according to the following formula:
S pv ＝P max /c
in the formula, S pv To suggest the installation of photovoltaic capacity, P max And c is the photovoltaic power generation efficiency for the highest load rate of the distribution transformer.
Further, by combining the electricity selling income of the distribution room and the photovoltaic cost, calculating the photovoltaic suggested installation capacity meeting the load requirement by adopting an approximation algorithm for the accumulative output electric quantity array and the suggested installation photovoltaic capacity array, and specifically comprising the following steps of:
recording the accumulated output electric quantity array as W (W) 1 、W 2 、…、W n ) Proposing to install a photovoltaic capacity array S PV ((S PV1 、S PV2 、…S PVn ) N represents a set time range;
obtaining electricity selling price C Price of electricity And the comprehensive daily cost C of photovoltaic construction pv Calculating photovoltaic local consumption electricity selling income W n *C Price of electricity And a comprehensive cost S for photovoltaic construction PVn *C pv ；
According to W n *C Price of electricity -S PVn *C pv And carrying out iterative operation on more than or equal to epsilon to obtain the transformer area installation photovoltaic capacity meeting the expected income, wherein epsilon is the numerical value of the expected income.
Further, the screening of heavy overload areas is further included after the preferred area group is formed, and the screening of heavy overload areas specifically includes:
acquiring the load rate condition of each distribution transformer in the optimal station group in the invalid time of photovoltaic power generation;
and recording the times of the load rate of each area reaching the heavy load rate condition, and if the times reach a preset value, recording the corresponding area as a heavy overload area and screening the heavy overload area in the preferred area group.
In a second aspect, the present invention provides a system for measuring and calculating a photovoltaic project access capacity of a distribution network area, including:
the data acquisition unit is used for acquiring output electric quantity data of distribution transformers of each area and calculating the accumulated transmission electric quantity of the distribution transformers in the photovoltaic effective power generation time within a random day;
the station area selection unit is used for selecting station areas meeting photovoltaic local consumption conditions according to the accumulated transmission electric quantity to form an optimal station area group;
the first calculation unit is used for associating an accumulated output electric quantity array of the optimal station group in the photovoltaic effective power generation time and a distribution transformer highest load rate array every day in a set time range, and calculating according to the distribution transformer highest load rate array to obtain a recommended installation photovoltaic capacity array;
and the second calculation unit is used for calculating the photovoltaic suggested installation capacity meeting the load requirement by adopting an approximation algorithm for the accumulated output electric quantity array and the suggested installation photovoltaic capacity array according to the power selling income of the distribution room and the photovoltaic cost.
Further, the selecting of the preferred station area group by the station area selecting unit specifically includes:
determining the condition W suitable for photovoltaic access of the transformer area according to the operation requirement of the distribution transformer 1 /(S 0 *a*b)>N set Wherein W is 1 For cumulative delivery of electric power, S 0 For the rated capacity of the distribution transformer, a is the heavy-load operating condition of the distribution transformer, b is the full-time-domain duration, N set Is a set value;
and screening according to the distribution and transformation rated capacity of the accumulated transmission electric quantity of each station area on random days, and forming the station areas meeting the conditions into an optimal station area group.
Further, the calculation of the suggested installation photovoltaic capacity array by the first calculation unit is specifically calculated according to the following formula:
S pv ＝P max /c
in the formula, S pv To suggest the installation of photovoltaic capacity, P max And c is the photovoltaic power generation efficiency for the highest load rate of the distribution transformer.
Further, the calculation of the photovoltaic suggested installation capacity meeting the load requirement by the second calculation unit specifically includes:
recording the accumulated output electric quantity array as W (W) 1 、W 2 、…、W n ) Proposing to install a photovoltaic capacity array S PV ((S PV1 、S PV2 、…S PVn ) N represents a set time range;
obtaining electricity selling price C Price of electricity And the comprehensive daily cost C of photovoltaic construction pv Calculating the electricity selling income W of photovoltaic consumption on the spot n *C Price of electricity And a comprehensive cost S for photovoltaic construction PVn *C pv ；
According to W n *C Price of electricity -S PVn *C pv And carrying out iterative operation on more than or equal to epsilon to obtain the transformer area installation photovoltaic capacity meeting the expected income, wherein epsilon is the numerical value of the expected income.
Further, the method also comprises the following steps: a heavy overload region screening unit;
the heavy overload platform area screening unit is used for acquiring the load rate condition of each distribution transformer in the optimal platform area group in the ineffective time of photovoltaic power generation; and recording the times of the load rate of each area reaching the heavy load rate condition, and if the times reach a preset value, recording the corresponding area as a heavy overload area and screening the heavy overload area in the preferred area group.
In conclusion, the invention provides a method and a system for measuring and calculating the photovoltaic project access capacity of a distribution network area, wherein the method comprises the steps of selecting an optimal area group meeting photovoltaic local consumption conditions according to the accumulated transmission electric quantity of photovoltaic effective power generation time of distribution transformers of each area in a random day; calculating according to the distribution transformer highest load rate array to obtain a recommended installation photovoltaic capacity array; and calculating the photovoltaic suggested installation capacity meeting the load requirement by adopting an approximation algorithm according to the electricity selling income of the distribution area and the photovoltaic cost. According to the method, the distribution area suitable for installing the distributed photovoltaic is selected, and the recommended access capacity is calculated by combining the actual condition of the distribution area, so that the distribution area suitable for installing the distributed photovoltaic can be determined more accurately, and the operation pressure and the line loss of the power distribution network are reduced.
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In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without inventive exercise.
Fig. 1 is a schematic flow chart of a method for measuring and calculating the photovoltaic project access capacity of a distribution network area according to an embodiment of the present invention.
Detailed Description
In order to make the objects, features and advantages of the present invention more obvious and understandable, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention, and it is apparent that the embodiments described below are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Along with the continuous development of whole county photovoltaic pilot point work, there is the distributed photovoltaic access constantly on rural distribution network low pressure platform district side. The transformer area is connected with photovoltaic capacity and position, the operation level of equipment such as distribution transformer and low-voltage wires of the transformer area is influenced, and the consumption condition of photovoltaic development and power generation is determined, so that the economic investment of a photovoltaic development project is influenced to a certain extent. The existing method for measuring and calculating the capacity of a photovoltaic access transformer area is mainly used for estimating the photovoltaic access capacity according to the capacity of transformer distribution of the transformer area, so that the total power of photovoltaic power generation does not exceed the total power of the transformer distribution.
However, in the existing method, the maximum installed capacity is sought simply from the consideration of a photovoltaic investment developer, and the photovoltaic capacity is not selectively accessed according to the actual load operation level of a distribution network distribution area, so that the photovoltaic power generation of a part of distribution areas cannot be effectively consumed on the spot, although the problem of heavy overload of outgoing line equipment in the distribution and transformation uploading process cannot be caused, the loss of the distribution areas, medium-voltage lines and other equipment is increased, and the method does not have good economy.
Based on the method, the invention provides a system of a method for measuring and calculating the photovoltaic project access capacity of a distribution network area.
The following describes an embodiment of the method for measuring and calculating the access capacity of the photovoltaic project of the distribution network area in detail.
Referring to fig. 1, the present embodiment provides a method for measuring and calculating a photovoltaic project access capacity of a distribution grid area, including:
s100: and collecting output electric quantity data of distribution transformers of each area and calculating the accumulated transmission electric quantity of the distribution transformers in the photovoltaic effective power generation time in random days.
The full-coverage intelligent distribution transformer terminal ammeter is used for collecting real-time electric quantity data of the distribution transformer, collecting load rate data of the distribution transformer recorded by the distribution transformer terminal in real time, and uploading the data to a database to realize the regular collection of output electric quantity data of the distribution transformer area.
Wherein, can define the photovoltaic active power generation time of daytime and photovoltaic power generation dead time at night, 06: 00-18: the 00 period is the photovoltaic effective power generation time, 18: 00-24: 00. the next day 00: 00-06: and 00 is the photovoltaic power generation dead time.
S200: and selecting the station areas meeting the photovoltaic local consumption condition according to the accumulated electric quantity to form the preferred station area group.
Through the transmission electric quantity data W in the recorded photovoltaic effective power generation time of the distribution transformer in random days 1 And distribution transformer rated capacity S 0 The distribution transformer accumulated transmission electric quantity ratio relation is used for preferably selecting the distribution area group X meeting photovoltaic local consumption 1 . The conditions that the transformer area is suitable for photovoltaic access are as follows:
W 1 /(S 0 *a*b)>N set
wherein W 1 For cumulative delivery of electric power, S 0 In order to change rated capacity, a is the heavy-load operation condition of the distribution transformer, 0.8 is taken in the embodiment, b is the full time domain duration, 12, N is taken in the embodiment set For the set value, this example takes 50%.
Namely, the area with the average full-time-domain power consumption exceeding 50% under the conditions of power transmission/distribution transformer heavy-load operation within the photovoltaic effective power generation time is screened out through the calculation formula.
S300: and calculating an accumulated output electric quantity array and a distribution transformation maximum load rate array of the associated optimal station group in the photovoltaic effective power generation time each day in a set time range according to the distribution transformation maximum load rate array to obtain a recommended installation photovoltaic capacity array.
According to the optimized distribution area group X1 meeting photovoltaic local consumption, the maximum power P in the photovoltaic effective power generation time within one month is related max The following formula is satisfied, where S pv Proposing installed capacity for installing distributed photovoltaic for the platform area;
S pv ＝P max /c (1)
wherein c is the current photovoltaic solar power generation efficiency, namely the photovoltaic power generation efficiency is 70%.
By data station areaGroup X 1 On the basis, accumulating an output electric quantity array W (W1, W2, W3, …, Wn +1, … and W30) in the photovoltaic effective power generation time of each day in one month of the peak load month; maximum load rate P of distribution transformer in photovoltaic effective power generation time every day in one month of associated peak load month max Array P MAX (P MAX1 、P MAX2 、P MAX3 、…、P MAXn 、P MAXn+1 、…、P MAX30 ) (ii) a Obtaining an array S of recommended installation photovoltaic capacity through a formula (1) PV ((S PV1 、S PV2 、S PV3 、…、S PVn 、S PVn+1 、…、S PV30 )。
S400: and calculating the photovoltaic suggested installation capacity meeting the load requirement by adopting an approximation algorithm for the accumulative output electric quantity array and the suggested installation photovoltaic capacity array according to the power selling income of the distribution area and the photovoltaic cost.
In this step, the process of calculating by using an approximation algorithm includes:
1) by block of data stations X 1 The cumulative output electric quantity array W (W) in the photovoltaic effective power generation time every day in the peak load month 1 、W 2 、W 3 、…、W n 、W n+1 、…、W 30 ) The electricity selling income W consumed by the photovoltaic on the spot can be obtained by manually inputting the electricity selling price C n *C Price of electricity ；
2) Installation of an array S of photovoltaic capacities with recommendations PV ((S PV1 、S PV2 、S PV3 、…、S PVn 、S PVn+1 、…、S PV30 ) By manually inputting the average daily cost C of the photovoltaic construction and operation in unit capacity pv Can obtain the comprehensive cost S of the suggested photovoltaic construction PVn *C pv ；
3) According to an approximation algorithm W n *C Price of electricity -S PVn *C pv And carrying out iterative operation on more than or equal to epsilon, wherein epsilon is an expected income value.
Through the calculation formula, the daily cost generated by subtracting the corresponding recommended photovoltaic installation capacity from the electricity selling income generated by actually transmitting the electricity on a certain day can be distributed and changed, and if the daily cost is more than the set expected income, the photovoltaic installation capacity under the iteration number is judged to be the recommended capacity.
In addition, screening heavy overloaded lands is also included after the preferred land group is formed. The method comprises the steps of recording the load rate condition of the distribution transformer of the transformer area in the invalid time of photovoltaic power generation, namely load rate data and time (namely a heavy load rate condition), recording the condition that the power output power exceeds 80% of the capacity of the distribution transformer, and the duration time exceeds 60 minutes as a heavy load frequency m, if the heavy load frequency m is greater than 10 in one month, continuing to obtain a heavy overload transformer area Y2, wherein the heavy overload of the distribution transformer cannot be solved through photovoltaic access of the partial transformer area, and the problem of heavy overload of the distribution transformer is solved by increasing the distribution transformer capacity of the transformer area through adding new distribution transformers.
The photovoltaic access work of the low-voltage transformer area is completed in two steps, firstly, the transformer area is optimized to be suitable for installing distributed photovoltaic by utilizing electric quantity data, power information and the like recorded by transformer area distribution and transformation terminal equipment; and secondly, aiming at the distribution area suitable for installing the distributed photovoltaic, calculating the capacity for recommending the installation of the distributed photovoltaic by an approximation algorithm by combining the actual on-site consumed load rate condition of the distribution area and the comprehensive construction cost of the distributed photovoltaic.
Compared with the traditional method, by estimating the installed capacity of the distributed photovoltaic, the method can more accurately determine which distribution area configuration changes are suitable for installing the distributed photovoltaic through real-time data, improve the local consumption capability of photovoltaic power generation, reduce the problem of energy delivery caused by insufficient local consumption, and reduce the operation pressure and line loss of the power distribution network. According to the method, the capacity of the distributed photovoltaic which is recommended to be installed is measured and calculated through an approximation algorithm by combining the actual on-site consumed load rate condition of the distribution area and the comprehensive construction cost of the distributed photovoltaic, and the measuring and calculating method of the investment construction installation is provided for investment of the distributed photovoltaic construction investment.
The above is a detailed description of an embodiment of the method for measuring and calculating the access capacity of the photovoltaic project of the distribution network area, and the following is a detailed description of an embodiment of the system for measuring and calculating the access capacity of the photovoltaic project of the distribution network area.
This embodiment provides a system for calculating power distribution network platform district photovoltaic project access capacity, includes: the device comprises a data acquisition unit, a platform area selection unit, a first calculation unit and a second calculation unit.
In this embodiment, the data acquisition unit is configured to acquire output power data of distribution transformers of each area and calculate an accumulated transmission power of the distribution transformers in a photovoltaic effective power generation time within a random day.
In this embodiment, the station area selection unit is configured to select the station areas meeting the photovoltaic local consumption condition according to the accumulated electric power to form the preferred station area group.
It should be noted that the selecting of the preferred cell group by the cell selecting unit specifically includes:
determining the condition W suitable for photovoltaic access of the transformer area according to the operation requirement of the distribution transformer 1 /(S 0 *a*b)>N set Wherein W is 1 For cumulative delivery of electric power, S 0 For the rated capacity of the distribution transformer, a is the heavy-load operating condition of the distribution transformer, b is the full-time-domain duration, N set Is a set value;
and screening according to the distribution and transformation rated capacity of the accumulated transmission electric quantity of each station area on random days, and forming the station areas meeting the conditions into an optimal station area group.
In this embodiment, the first calculating unit is configured to associate the cumulative output electric quantity array of the preferred station group in the photovoltaic effective power generation time and the distribution transformation maximum load rate array each day within the set time range, and calculate the recommended installation photovoltaic capacity array according to the distribution transformation maximum load rate array.
It should be noted that the calculation of the suggested installation photovoltaic capacity array by the first calculation unit is specifically calculated according to the following formula:
S pv ＝P max /c
in the formula, S pv To suggest the installation of photovoltaic capacity, P max And c is the photovoltaic power generation efficiency for the highest load rate of the distribution transformer.
In this embodiment, the second calculation unit is configured to calculate, by using an approximation algorithm, a photovoltaic recommended installation capacity that meets the load requirement for the cumulative output electric quantity array and the recommended installation photovoltaic capacity array in combination with the power selling income of the distribution room and the photovoltaic cost.
It should be noted that, the second calculation unit calculates the photovoltaic suggested installation capacity meeting the load requirement, and specifically includes:
recording the accumulated output electric quantity array as W (W) 1 、W 2 、…、W n ) Proposing to install a photovoltaic capacity array S PV ((S PV1 、S PV2 、…S PVn ) N represents a set time range;
obtaining electricity selling price C Price of electricity And the comprehensive daily cost C of photovoltaic construction pv Calculating the electricity selling income W of photovoltaic consumption on the spot n *C Price of electricity And a comprehensive cost S for photovoltaic construction PVn *C pv ；
According to W n *C Price of electricity -S PVn *C pv And carrying out iterative operation on more than or equal to epsilon to obtain the transformer area installation photovoltaic capacity meeting the expected income, wherein epsilon is the numerical value of the expected income.
Further, the method also comprises the following steps: a heavy overload region screening unit;
the heavy overload platform area screening unit is used for acquiring the load rate condition of each distribution transformer in the optimal platform area group in the ineffective time of photovoltaic power generation; and recording the times of the load rate of each area reaching the heavy load rate condition, and if the times reach a preset value, recording the corresponding area as a heavy overload area and screening the heavy overload area in the preferred area group.
It should be noted that, the measurement and calculation system provided in this embodiment is used to implement the measurement and calculation method provided in the foregoing embodiment, and the specific settings of each unit are subject to complete implementation of the method, which is not described herein again.
The above examples are only intended to illustrate the technical solution of the present invention, and not to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions of the embodiments of the present invention.

Claims (10)

1. A method for measuring and calculating the photovoltaic project access capacity of a distribution network area is characterized by comprising the following steps:
collecting output electric quantity data of distribution transformers of each area and calculating the accumulated transmission electric quantity of the distribution transformers in the photovoltaic effective power generation time within a random day;
selecting a platform area meeting photovoltaic local consumption conditions according to the accumulated transmission electric quantity to form a preferred platform area group;
associating the accumulated output electric quantity array of the optimal station group in the photovoltaic effective power generation time and the distribution transformation highest load rate array every day in a set time range, and calculating according to the distribution transformation highest load rate array to obtain a recommended installation photovoltaic capacity array;
and calculating the photovoltaic recommended installation capacity meeting the load requirement by adopting an approximation algorithm for the accumulated output electric quantity array and the recommended installation photovoltaic capacity array according to the power selling income of the distribution room and the photovoltaic cost.
2. The method for measuring and calculating the photovoltaic project access capacity of the distribution network transformer area according to claim 1, wherein transformer areas meeting photovoltaic local consumption conditions are selected according to the accumulated transmission electric quantity to form a preferred transformer area group, and the method specifically comprises the following steps:
determining the condition W suitable for photovoltaic access of the transformer area according to the operation requirement of the distribution transformer 1 /(S 0 *a*b)>N set Wherein W is 1 For said accumulated delivery of electric power, S 0 For the rated capacity of the distribution transformer, a is the heavy-load operating condition of the distribution transformer, b is the full-time-domain duration, N set Is a set value;
and screening according to the distribution transformation rated capacity of the accumulated transmission electric quantity of each distribution area on random days, and forming the distribution areas meeting the conditions into the preferred distribution area group.
3. The method for measuring and calculating the access capacity of the photovoltaic project of the distribution network transformer area according to claim 1, wherein the recommended installation photovoltaic capacity array calculated according to the distribution transformer highest load rate group is specifically calculated according to the following formula:
S pv ＝P max /c
in the formula, S pv To suggest the installation of photovoltaic capacity, P max And c is the photovoltaic power generation efficiency for the highest load rate of the distribution transformer.
4. The method for measuring and calculating the access capacity of the photovoltaic project of the distribution network distribution area according to claim 3, wherein the photovoltaic recommended installation capacity meeting the load requirement is calculated by adopting an approximation algorithm for the accumulated output electric quantity array and the recommended installation photovoltaic capacity array by combining the electricity selling income of the distribution area and the photovoltaic cost, and specifically comprises the following steps:
recording the accumulated output electric quantity array as W (W) 1 、W 2 、…、W n ) The proposed installation of a photovoltaic capacity array S PV ((S PV1 、S PV2 、…S PVn ) N represents the set time range;
obtaining electricity selling price C Price of electricity And the comprehensive daily cost C of photovoltaic construction pv Calculating the electricity selling income W of photovoltaic consumption on the spot n *C Price of electricity And a comprehensive cost S for photovoltaic construction PVn *C pv ；
According to W n *C Price of electricity -S PVn *C pv And carrying out iterative operation on more than or equal to epsilon to obtain the transformer area installation photovoltaic capacity meeting the expected income, wherein epsilon is the numerical value of the expected income.
5. The method for measuring and calculating the photovoltaic project access capacity of the distribution network transformer area according to claim 1, wherein the step of screening out the heavy and overload transformer area after the optimal transformer area group is formed further comprises the following steps:
acquiring the load rate condition of each distribution transformer in the preferred station group in the invalid time of photovoltaic power generation;
and recording the times of the load factor of each area reaching the heavy load factor condition, and if the times reach a preset value, recording the corresponding area as the heavy overload area and screening the heavy overload area in the preferred area group.
6. A system for measuring and calculating the photovoltaic project access capacity of a distribution network area is characterized by comprising:
the data acquisition unit is used for acquiring output electric quantity data of distribution transformers of each area and calculating the accumulated transmission electric quantity of the distribution transformers in the photovoltaic effective power generation time within a random day;
the station area selection unit is used for selecting station areas meeting photovoltaic local consumption conditions according to the accumulated transmission electric quantity to form an optimal station area group;
the first calculation unit is used for associating an accumulated output electric quantity array of the optimal station group in the photovoltaic effective power generation time and a distribution transformer highest load rate array every day in a set time range, and calculating to obtain a recommended installation photovoltaic capacity array according to the distribution transformer highest load rate array;
and the second calculation unit is used for calculating the photovoltaic suggested installation capacity meeting the load requirement by adopting an approximation algorithm for the accumulated output electric quantity array and the suggested installation photovoltaic capacity array according to the power selling income of the distribution room and the photovoltaic cost.
7. The system for measuring and calculating the access capacity of the photovoltaic project of the distribution network area according to claim 6, wherein the selecting, by the area selecting unit, a preferred area group specifically comprises:
determining the condition W suitable for photovoltaic access of the transformer area according to the operation requirement of the distribution transformer 1 /(S 0 *a*b)>N set Wherein W is 1 For said accumulated delivery of electric power, S 0 For the rated capacity of the distribution transformer, a is the heavy-load operating condition of the distribution transformer, b is the full-time-domain duration, N set Is a set value;
and screening according to the distribution and transformation rated capacity of the accumulated transmission electric quantity of each station area on random days, and forming the station areas meeting the conditions into the preferred station area group.
8. The system for measuring and calculating the access capacity of the photovoltaic project of the distribution network transformer area according to claim 6, wherein the first calculation unit calculates the recommended installation photovoltaic capacity array specifically according to the following formula:
S pv ＝P max /c
in the formula, S pv To suggest the installation of photovoltaic capacity, P max And c is the photovoltaic power generation efficiency for the highest load rate of the distribution transformer.
9. The system for calculating the photovoltaic project access capacity of the distribution network transformer area according to claim 8, wherein the second calculation unit calculates a photovoltaic recommended installation capacity meeting the load requirement, and specifically comprises:
recording the accumulated output electric quantity array as W (W) 1 、W 2 、…、W n ) The proposed installation of a photovoltaic capacity array S PV ((S PV1 、S PV2 、…S PVn ) N represents the set time range;
obtaining electricity selling price C Price of electricity And the comprehensive daily cost C of photovoltaic construction pv Calculating the electricity selling income W of photovoltaic consumption on the spot n *C Electricity price And a comprehensive cost S for photovoltaic construction PVn *C pv ；
According to W n *C Price of electricity -S PVn *C pv And carrying out iterative operation on more than or equal to epsilon to obtain the transformer area installation photovoltaic capacity meeting the expected income, wherein epsilon is the numerical value of the expected income.
10. The system for measuring and calculating the photovoltaic project access capacity of the distribution network transformer area according to claim 6, further comprising: a heavy overload region screening unit;
the heavy overload platform area screening unit is used for acquiring the load rate condition of each distribution transformer in the preferred platform area group in the invalid time of photovoltaic power generation; and recording the times of the load factor of each area reaching the heavy load factor condition, and if the times reach a preset value, recording the corresponding area as the heavy overload area and screening the heavy overload area in the preferred area group.
CN202210668386.8A 2022-06-14 2022-06-14 Method and system for measuring and calculating photovoltaic project access capacity of distribution network area Pending CN114977323A (en)

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN116054265A (en) * 2023-03-23 2023-05-02 国网山西省电力公司营销服务中心 Metering method and system for photovoltaic accessible capacity in transformer area

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN116054265A (en) * 2023-03-23 2023-05-02 国网山西省电力公司营销服务中心 Metering method and system for photovoltaic accessible capacity in transformer area

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