CN110826821B - Distribution network planning method based on distributed optical storage and charging - Google Patents
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Abstract
The invention provides a power distribution network planning method based on distributed light storage and charging, which comprises the following steps: acquiring electric vehicle data of a power supply area corresponding to the line, predicting a load value of the electric vehicle during charging, calculating a total capacity value of charging stations of the power supply area according to the load value, and constructing a plurality of charging station address selection combinations according to the total capacity value of the charging stations; energy storage stations are arranged at the charging stations at the same time, the total capacity of the energy storage stations is designed at the same time, and a plurality of energy storage station site selection combinations are constructed; comprehensively considering the energy storage station site selection combination and the charging station site selection combination to obtain a plurality of site selection combinations considering the charging stations and the energy storage stations at the same time; and respectively calculating the line loss and the voltage offset of each addressing combination according to the addressing combination, simultaneously calculating the economic loss caused by the line loss, calculating the economic loss caused by the voltage offset, obtaining the sum of the economic losses of each combination, and selecting the combination with the minimum economic loss as an addressing scheme.
Description
Technical Field
The invention relates to the technical field of power grid planning, in particular to a power distribution network planning method based on distributed light storage and charging.
Background
The access of distributed photovoltaic and charging station loads will affect the tide distribution, power supply reliability and scheduling operation of the traditional power distribution network, and the influence on the power distribution network will be larger and larger along with the continuous development of the distributed photovoltaic and charging station loads. Energy storage and distributed photovoltaic are built synchronously, the adjusting pressure of the power grid after the distributed photovoltaic is connected can be greatly reduced, auxiliary services such as frequency modulation are avoided being used excessively, instantaneous active power loss of a circuit can be compensated timely, the voltage deviation time is shortened, and the key indexes of the power grid are improved. In addition to cost limitations, the main limitations of energy storage planning are site selection and volume fixing.
At present, the planning and research direction for optical storage and charging is only directed at the whole city, and the operation capacity of the integration of optical storage and charging when a network distribution line is connected into the city is not considered, and whether the cooperative planning and site selection of a charging station and an energy storage station can optimize the line flow and the voltage or not is not considered.
Disclosure of Invention
The invention aims to provide a power distribution network planning method based on distributed optical storage and charging, so as to solve the problems in the background technology.
The invention is realized by the following technical scheme: a method for planning a power distribution network based on distributed optical storage and charging, the method comprising:
collecting data of a power distribution network on any power distribution line, wherein the data comprises data of static elements on the line and time sequence data of dynamic elements on the line;
acquiring electric vehicle data of a power supply area corresponding to the line, predicting a load value of an electric vehicle during charging, calculating a total capacity value of charging stations of the power supply area according to the load value, and constructing a plurality of charging station address selection combinations according to the total capacity value of the charging stations;
energy storage stations are arranged at the charging stations at the same time, the total capacity of the energy storage stations is designed at the same time, and a plurality of energy storage station site selection combinations are constructed;
comprehensively considering the energy storage station site selection combination and the charging station site selection combination to obtain a plurality of site selection combinations considering the charging stations and the energy storage stations at the same time;
and respectively calculating the line loss and the voltage offset of each addressing combination according to the addressing combination, simultaneously calculating the economic loss caused by the line loss, calculating the economic loss caused by the voltage offset, obtaining the sum of the economic losses of each combination, and selecting the combination with the minimum economic loss as an addressing scheme.
Preferably, the predicting the load value when the electric vehicle is charged includes: the calculation method comprises the following steps:
wherein, a c Simultaneous charging rate, k, for electric vehicles e The proportion of the electric automobile in the total amount of the automobile in a certain area, w eav Is the average battery capacity, t, of the electric vehicle e Is the average full time of the battery of the electric automobile,
the total amount of traffic per day, sigma k, for a plurality of lines in a region i Total parking amount, n, of a plurality of parking lots in a certain area i The charging load value of the charging station.
Preferably, the capacity of the charging station for the power supply area is calculated according to the load value, and the calculation method is as follows:
s v ＝P v /ρ v
wherein s is v For charging station capacity, and P v For charging load value, ρ v Is the load factor.
Preferably, the number of the energy storage stations is several, and the total capacity of the energy storage stations is 30% of daily average electric quantity of the line.
Preferably, the site selection combination considering the charging stations and the energy storage stations comprises at least one charging station and at least one energy storage station at the same time.
Preferably, the method for calculating the economic loss caused by the line loss comprises the following steps: and setting an average electricity price, and obtaining an economic loss result of the line loss by the product of the line loss value and the average electricity price.
Compared with the prior art, the invention has the following beneficial effects:
according to the power distribution network planning method based on distributed light storage and charging, combination modes comprising the charging stations and the energy storage stations are obtained through comprehensive consideration, the site selection scheme is determined through the judgment mode of each combination economic loss, the site selection of the charging stations and the energy storage stations which are (to be) accessed into the 10kV line of the distributed photovoltaic can be guided, the network loss generated by the line during operation after the line is built is reduced, and the line operation voltage quality is improved.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed to be used in the description of the embodiments will be briefly introduced below, and it is obvious that the drawings in the following description are only preferred embodiments of the present invention, and it is obvious for those skilled in the art that other drawings can be obtained according to these drawings without inventive exercise.
Fig. 1 is a flowchart of a power distribution network planning method based on distributed optical storage and charging according to the present invention;
FIG. 2 is a schematic view of an assembly according to the present invention;
fig. 3 is another schematic diagram of the present invention.
Detailed Description
In order to better understand the technical content of the invention, specific embodiments are provided below, and the invention is further described with reference to the accompanying drawings.
Referring to fig. 1 to 3, a method for planning a power distribution network based on distributed optical storage, the method comprising:
collecting data of a power distribution network on any power distribution line, wherein the data comprises data of static elements on the line and time sequence data of dynamic elements on the line;
splitting any distribution line into n sections, dividing the distribution line into n-1 nodes, marking the nodes with letters A, B, C, and arranging a charging station or an energy storage station at the nodes, and simultaneously acquiring time sequence data of static elements and dynamic elements on the n sections of lines, wherein the static elements comprise static elements such as switches, the dynamic elements comprise dynamic elements such as loads and distributed power supplies, and the acquired data are stored into power flow calculation software according to hours;
simultaneously acquiring electric vehicle data of a power supply area corresponding to the line, predicting a load value of the electric vehicle during charging, calculating a total capacity value of charging stations of the power supply area according to the load value, and constructing a plurality of charging station address selection combinations according to the total capacity value of the charging stations;
the electric vehicle data comprises data such as electric charging use and the like, and meanwhile, the load value of the electric vehicle during charging can be predicted by adopting the following formula:
wherein, a c Charge synchronization rate, k, for electric vehicles r The proportion of the electric automobile in the total amount of the automobile in a certain area, w eav Is the average battery capacity, t, of the electric vehicle e Is the average full time of the battery of the electric automobile,
the total amount of traffic per day, Σ k, for a plurality of lines in an area i Total parking amount, n, of a plurality of parking lots in a certain area i A charging load value for the charging station;
after the load value of the electric vehicle during charging is obtained, the total capacity value of the charging station in the power supply area can be calculated by adopting the following formula:
S V ＝P V /ρ v
wherein S is v For charging station capacity, and P v For charging load value, ρ v In order to obtain the load factor, the load factor is the rated charging station load factor at saturation, and since the rated capacity of the charging station is usually the whole value of 1000kVA, 500kVA, 300kVA at the time of construction, a plurality of charging stations can be selected and combined according to the calculated total capacity value of the charging stations in the power supply area, and the rated capacity of the charging station is larger than the calculated total capacity value of the charging stations in the power supply area, for example, the calculated total capacity value of the charging stations in the power supply area is 1950kVA capacity, but the rated capacity of the charging station is usually the whole value of 1000kVA, 500kVA, 300kVA, and the whole value closest to 1950kVA is 2000kVA, therefore, the rated capacity of the charging station can be selected as 2000kVA plurality of charging station address combinations can be obtained: a. two 1000kVA charging stations; b. one 1000kVA charging station and two 500kVA charging stations;
the method comprises the following steps of simultaneously arranging energy storage stations at charging stations, simultaneously designing the total capacity of the energy storage stations, wherein the total capacity of the energy storage stations is 30% of the daily average electric quantity of a power distribution line, and during construction, the rated capacity of the energy storage stations is usually an integral value of 1, 3 and 5Mwh, so that a plurality of energy storage stations can be selected for combination according to the calculated total capacity value of the energy storage stations in a power supply area, the rated capacity of the energy storage stations is larger than the calculated total capacity value of the energy storage stations in the power supply area, for example, the calculated total capacity value of the charging stations in the power supply area is 1950KVA capacity, the calculated capacity of the energy storage stations in the power supply area is 5.4Mwh, and because the energy storage conditions of the energy storage stations are always in dynamic transformation, the rated capacity of the energy storage stations can be in a range value of 5-6Mwh, the rated capacity of the charging stations can be 2000KVA, and the following considerations and site selection combination of the energy storage stations can be obtained:
when the energy storage station is 6Mwh, the combination mode of the charging station and the energy storage station is as follows: a. one 1000kVA charging station, two 500kVA charging stations and two 3MWh energy storage stations; b. two 1000kVA charging stations and two 3MWh energy storage stations;
when the energy storage station is 5Mwh, the combination mode of the charging station and the energy storage station is as follows: a. one 1000kVA charging station, two 500kVA charging stations and one 5MWh energy storage station; b. two 1000kVA charging stations and one 5MWh energy storage station;
respectively calculating the line loss and the voltage offset of each addressing combination according to the addressing combination, wherein the calculation mode of the line loss is as follows: setting an average electricity price, and obtaining an economic loss result of the line loss by the product of the line loss value and the average electricity price; for example, when the energy storage station is 6Mwh, the line loss of the combination a obtained by the power flow calculation software is 3250 degrees, the average price of electricity is set to be 0.8 yuan/degree, and the economic loss of the combination a is 2600 yuan
Similarly, the electric quantity loss condition caused by the voltage deviation of the combination a is calculated through load flow calculation software, and meanwhile, the economic loss in the combination a is calculated according to the set average electricity price;
and when the sum of the economic loss caused by the line loss in the combination a and the combination b and the economic loss caused by the voltage offset are calculated respectively, comparing the economic losses in the combination a and the combination b respectively, and selecting the combination with the minimum economic loss as an addressing scheme.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents, improvements and the like made within the spirit and principle of the present invention should be included in the scope of the present invention.
Claims (6)
1. A power distribution network planning method based on distributed optical storage and charging is characterized by comprising the following steps:
collecting power distribution network data on any power distribution line, and storing the power distribution network data into load flow calculation software, wherein the data comprises data of static elements on the line and time sequence data of dynamic elements on the line;
acquiring electric vehicle data of a power supply area corresponding to the line, predicting a load value of the electric vehicle during charging, calculating a total capacity value of charging stations of the power supply area according to the load value, and constructing a plurality of charging station address selection combinations according to the total capacity value of the charging stations;
energy storage stations are arranged at the charging stations at the same time, the total capacity of the energy storage stations is designed at the same time, and a plurality of energy storage station site selection combinations are constructed;
comprehensively considering the energy storage station site selection combination and the charging station site selection combination to obtain a plurality of site selection combinations considering the charging stations and the energy storage stations at the same time;
and respectively calculating the line loss and the voltage offset of each addressing combination according to the addressing combination, simultaneously calculating the economic loss caused by the line loss, calculating the economic loss caused by the voltage offset, obtaining the sum of the economic losses of each combination, and selecting the combination with the minimum economic loss as an addressing scheme.
2. The method for planning the power distribution network based on the distributed light storage and charging of claim 1, wherein predicting the load value of the electric vehicle during charging comprises: the calculation method comprises the following steps:
wherein, a c Is an electric steamVehicle charging coincidence rate, k e The proportion of the electric automobile in the total amount of the automobile in a certain area, w eav Is the average battery capacity, t, of the electric vehicle e Is the average full time of the battery of the electric automobile,
the total amount of traffic per day, sigma k, for a plurality of lines in a region i Total parking amount of a plurality of parking lots in a certain area, n i The charging load value of the charging station.
3. The method according to claim 2, wherein the capacity of the charging station in the power supply area is calculated according to the load value, and the calculation method comprises:
S V ＝P V /ρ V
wherein S is V For charging station capacity, and P V For charging load value, ρ V Is the load factor.
4. The method according to claim 1, wherein the number of the energy storage stations is several, and the total capacity of the energy storage stations is 30% of the daily average electricity of the line.
5. The method according to claim 1, wherein the site selection combination of the charging stations and the energy storage stations is considered to include at least one charging station and at least one energy storage station.
6. The method for planning the power distribution network based on the distributed optical storage and charging system of claim 1, wherein the method for calculating the economic loss caused by the line loss comprises the following steps: and setting an average electricity price, and obtaining an economic loss result of the line loss by the product of the line loss value and the average electricity price.
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| CN104866915B (en) * | 2015-05-05 | 2018-08-28 | 湖南大学 | Electric automobile charging station Method for optimized planning based on overall life cycle cost |
| CN105160428B (en) * | 2015-08-19 | 2018-04-06 | 天津大学 | The planing method of electric automobile on highway quick charge station |
| CN106410799B (en) * | 2016-11-27 | 2019-04-16 | 东北电力大学 | Site selecting method for electric automobile charging station in photovoltaic high permeability power distribution network |
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