CN112350334A - Power supply method of comprehensive parking lot charging facility - Google Patents

Abstract

The invention discloses a power supply method of a comprehensive parking lot charging facility, which comprises the following steps: step S10, generating a typical daily load curve of the comprehensive parking lot according to the service vehicles of the comprehensive parking lot, the type, the power and the quantity of the charging piles; step S11, generating a grid daily load curve and power supply capacity of the comprehensive yard production year and the distant view year; step S12, performing long-range power supply margin evaluation; step S13, carrying out power supply margin evaluation of the production year; step S14, performing controllable load evaluation; and step S15, generating a comprehensive yard power supply scheme suggestion according to the evaluation result. By implementing the method and the device, a reasonable power supply scheme suggestion can be generated, the power supply requirement is met, and the equipment utilization rate and the land utilization efficiency are improved.

Description

Power supply method of comprehensive parking lot charging facility

Technical Field

The invention relates to the field of power system application, in particular to a power supply method of a comprehensive parking lot charging facility.

Background

In recent years, the electric automobile industry is rapidly developed under the promotion of national industrial policies, energy conservation, emission reduction and the like, but with the increase of the number of electric automobiles, the problems of shortage of charging places, delay in construction of charging facilities and the like appear. In order to save urban land and accelerate the construction of charging facilities, a three-dimensional comprehensive parking lot is planned, namely, an electric vehicle charging station is constructed in a three-dimensional mode in a relatively concentrated land, so that the charging requirements of various types of electric vehicles such as buses, taxies, social vehicles and the like are met, and the land utilization efficiency is improved. The land occupation of a large-scale comprehensive parking lot can reach 4 ten thousand square meters, and the electricity utilization telegraph is over 10 thousand volt-ampere. With the investment of the comprehensive parking lot, the centralized charging of the charging facilities can bring certain impact to the power grid, and the power supply capacity of the local power grid is tested.

According to the conventional standard, a user reporting a load exceeding a certain value (such as 4 ten thousand volt-ampere) needs to configure a transformer substation to solve the power supply problem, if the load is smaller than the fixed value, a medium-voltage distribution network access mode is adopted, but the power consumption time period of the comprehensive yard is different from the conventional load to a certain extent, and a 'one-off' power supply scheme is adopted, so that the influence of overestimation on a power grid is easily caused, the utilization rate of equipment of a new station is low, the influence on the power grid can be underestimated, and the power supply tension of a near area is caused. How to formulate high-efficient power supply scheme in order to satisfy power supply demand, promote equipment utilization ratio and land use efficiency simultaneously is the problem that needs to solve urgently.

Disclosure of Invention

The technical problem to be solved by the invention is to provide a power supply method of a comprehensive parking lot charging facility, which can generate a reasonable power supply scheme proposal, meet the power supply requirement and simultaneously improve the equipment utilization rate and the land utilization efficiency.

The technical scheme adopted by the invention is that a power supply method of a comprehensive parking lot charging facility is provided, which comprises the following steps:

step S10, generating a typical daily load curve S1 of the comprehensive parking lot according to the service vehicles of the comprehensive parking lot, the type, the power and the quantity of the charging piles;

step S11, according to the production time of the comprehensive parking lot and the high-voltage distribution network grid, generating a typical daily load curve S2 of the high-voltage distribution network grid of the production year of the comprehensive parking lot_{Put into production}And the power supply capacity W of the main transformer in the grid_{Put into production}Typical daily load curve S2 of high-voltage distribution network grid of distant view year_{Distant view}And the power supply capacity W of the main transformer in the grid_{Distant view}；

Step S12, the power supply margin of the distant view is evaluated, and the typical daily load curve S2 of the high-voltage distribution network grid corresponding to the distant view year is used_{Distant view}And the typical daily load curve S1 of the integrated parking lot_{Distant view}Overlapping to generate a total daily load curve S of the distant view annual grid_{Distant view}Calculating the corresponding daily maximum load P_{maxs-perspective}According to said daily maximum load P_{maxs-perspective}Determining whether the capacity of a newly added transformer substation is needed in a long term;

step S13, carrying out power supply margin evaluation of the production year, and carrying out typical daily load curve S2 of the high-voltage distribution network grid corresponding to the production year_{Put into production}And the typical daily load curve S1 of the integrated parking lot_{Put into production}Overlapping to generate a total daily load curve S of the production year grid_{Put into production}Calculating the corresponding first day maximum load P_{maxs-production}Determining whether the capacity of the newly increased substation is needed in the near future according to the maximum load on the first day;

step S14, performing controllable load evaluation, and generating a controllable daily load curve S3 of the comprehensive parking lot according to the reducible load of the comprehensive parking lot; total daily load curve S of production year grid_{Put into production}Superposed with the controllable daily load curve S3 to generate a load curve K after the on-production year grid control_{Put into production}Calculating the corresponding second-day maximum load P_{maxk-commissioning}Determining whether the capacity of the newly increased transformer substation is needed in the near future according to the maximum load of the second day;

step S15, generating a comprehensive yard power supply scheme suggestion according to the evaluation results of the steps S12-S14, wherein the comprehensive yard power supply scheme at least comprises one of the following:

synchronously constructing a transformer substation by combining the comprehensive yard;

the main transformer is not built in the near term, and the main transformer is built according to the load development in the long term;

newly adding planned substation distribution points in advance;

and (4) determining whether ordered charging is required by utilizing the power supply of the existing transformer substation.

Preferably, in the step S10, the accuracy of the load curve is acquired once or more in half an hour.

Preferably, the step S12 further includes:

if the total load of the distant view year grid is S_{Distant view}Corresponding daily maximum load P_{maxs-perspective}Grid power supply capability W ≦_{Distant view}Determining that the capacity of the transformer substation does not need to be newly increased in the long term;

if P is_{maxs-perspective}>W_{Distant view}And determining that the capacity of the newly added substation is needed in the long term.

Preferably, the step S13 further includes:

if the total load of the production year grid is S_{Put into production}Corresponding daily maximum load P_{maxs-production}Grid power supply capacity W at production year_{Put into production}If yes, determining that the newly added transformer substation capacity is not needed in the near future, and the process goes to step S15;

if P is_{maxs-production}>W_{Put into production}The flow advances to step S14.

Preferably, the step S14 further includes:

if P is_{maxk-commissioning}≦W_{Put into production}Determining that the capacity of the transformer substation does not need to be increased newly in the near term, but orderly charging is needed to be carried out, and controlling the peak load;

if P is_{maxk-commissioning}>W_{Put into production}And determining that the capacity of the newly added substation is required recently.

Preferably, the step S15 further includes:

in the evaluation result, if newly increased transformer substation capacity is recommended in both the distant view and the production year, the power supply scheme is to combine the comprehensive yard to synchronously construct the transformer substation;

if only a distant view suggests newly increasing the capacity of the transformer substation, the power supply scheme reserves transformer substation land for combining the comprehensive vehicle yard, a main transformer is not built in the near future, and the distant view is built according to load development;

if the newly increased capacity of the transformer substation is only recently suggested, the power supply scheme is that planned transformer substation distribution points are newly increased in advance in a high-voltage distribution network grid of the comprehensive vehicle yard, including new construction or extension;

and if the capacity of the newly-added transformer substation is not needed in the near and long periods, the power supply scheme is to utilize the existing transformer substation for power supply and provide whether ordered charging is needed or not according to the evaluation result.

The implementation of the invention has the following beneficial effects:

the invention provides a power supply method of a comprehensive parking lot charging facility, which is based on gridding analysis and planning, considers controllable load influence, comprehensively analyzes factors such as near-term and far-term load development and power grid development and generates a reasonable power supply scheme suggestion. By implementing the invention, the power supply requirement of the three-dimensional comprehensive parking lot can be met, and the equipment utilization rate and the land utilization efficiency are improved simultaneously.

Drawings

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 introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is within the scope of the present invention for those skilled in the art to obtain other drawings based on the drawings without inventive exercise.

Fig. 1 is a schematic main flow chart of an embodiment of a power supply method of an integrated yard charging facility according to the present invention.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments.

For those skilled in the art to more clearly understand the objects, technical solutions and advantages of the present invention, the following description will be further provided in conjunction with the accompanying drawings and examples.

Referring to fig. 1, a main flow diagram of an embodiment of a method for supplying power to an integrated yard charging facility according to the present invention is shown. In this embodiment, the method for supplying power to the integrated yard charging facility includes the following steps:

step S10, generating a typical daily load curve S1 of the comprehensive parking lot according to the service vehicles of the comprehensive parking lot, the type, the power and the quantity of the charging piles;

for example, for a certain comprehensive parking lot, the daytime service vehicles are mainly electric taxis, logistics vehicles, sanitation vehicles, private cars and a small number of public buses for charging, and the night service vehicles are mainly public buses and electric taxis. Taking the charging of the bus in a typical day (which can be taken as a normal working day generally) as an example, the bus is continuously returned to the field for charging at 23:00-1:00 at night, a small amount of charging is carried out at 10:00-15:00 at the day, the proportion of the charging pile occupied by each time period is predicted according to the charging characteristics and the number of the buses, and the daily charging curve of the bus is calculated according to the number of the charging piles, the occupation ratio and the power. Similarly, for various different service vehicles, corresponding charging curves are predicted and superposed to obtain a comprehensive yard daily load curve;

more preferably, the accuracy of the load curve is better when 48 points (one point in a half hour) and above because the charging load is influenced by the charging price, and the charging peak-valley average price may change in half an hour.

Step S11, according to the production time of the comprehensive parking lot and the high-voltage distribution network grid, generating a typical daily load curve S2 of the high-voltage distribution network grid of the production year of the comprehensive parking lot_{Put into production}And the power supply capacity W of the main transformer in the grid_{Put into production}Typical daily load curve S2 of high-voltage distribution network grid of distant view year_{Distant view}And the power supply capacity W of the main transformer in the grid_{Distant view}；

A gridding concept is gradually established in urban power distribution networks of 110kV and below, a complex power distribution network is divided into a plurality of geographically and electrically relatively independent power supply grids, and the grids are used as units for distribution network management. For a high-voltage distribution network, administrative divisions, main roads and the like can be combined for division, 3-4 substations are contained in one grid, the power supply ranges of the substations in the same grid are close, and the mutual support capacity is strong. In order to meet the power supply requirement of the comprehensive parking lot, analysis needs to be carried out from a high-voltage distribution network grid where the comprehensive parking lot is located.

For the high-voltage distribution network grid of the comprehensive vehicle yard, according to a load density method, a prospective typical daily load curve is predicted by using land properties and building areas, all transformer stations in the grid are considered according to the scale of a final main transformer, and a prospective typical daily load curve S2 of the prospective annual grid corresponding to the grid of the comprehensive vehicle yard is obtained_{Distant view}And simultaneously, the main transformer power supply capacity W in the grid is calculated by combining the total main transformer capacity and the reasonable load rate of the medium-voltage distribution network from voltage reduction in the distant view grid_{Distant view}(ii) a The grid load of the comprehensive parking lot production year can be predicted according to the existing load curve, a load reporting method, a growth rate method and other methods, and by combining with near-middle-period substation planning, a typical daily load curve S2 of the corresponding production year grid is obtained_{Put into production}And simultaneously, the main transformer power supply capacity W in the grid is calculated by combining the total main transformer capacity and the reasonable load rate of the network from voltage reduction to medium voltage distribution in the production year grid_{Put into production}。

Step S12, the power supply margin of the distant view is evaluated, and the typical daily load curve S2 of the high-voltage distribution network grid corresponding to the distant view year is used_{Distant view}And the typical daily load curve S1 of the integrated parking lot_{Distant view}Overlapping to generate a total daily load curve S of the distant view annual grid_{Distant view}Calculating the corresponding daily maximum load P_{maxs-perspective}：

Specifically, if the prospective year grid total load S_{Distant view}Corresponding daily maximum load P_{maxs-perspective}Grid power supply capability W ≦_{Distant view}The power supply capacity of the comprehensive yard is satisfied by the set point capacity of the prospective planning transformer substation, and the capacity of the transformer substation is determined not to be newly added in the long term;

if P is_{maxs-perspective}>W_{Distant view}And the setting point capacity of the distant view transformer substation cannot meet the power supply requirement of the comprehensive parking lot, and the capacity of the newly added transformer substation is determined to be needed in the long term.

Step S13, the power supply margin of the production year is evaluated, and the typical sun of the high-voltage distribution network grid corresponding to the production year is chargedLoad curve S2_{Put into production}And the typical daily load curve S1 of the integrated parking lot_{Put into production}Overlapping to generate a total daily load curve S of the production year grid_{Put into production}Calculating the corresponding first day maximum load P_{maxs-production}：

Wherein if the year of production is put into operation, the total grid load S_{Put into production}Corresponding first day maximum load P_{maxs-production}Grid power supply capacity W at production year_{Put into production}If the planned substation distribution point capacity in the production year meets the comprehensive yard power supply requirement, the newly increased substation capacity is not needed in the near future, and the operation enters step S15;

if P is_{maxs-production}>W_{Put into production}If the distribution point capacity of the transformer station in the production year cannot meet the power supply requirement of the comprehensive parking lot, the step S14 is executed.

Step S14, performing controllable load evaluation, and generating a controllable daily load curve S3 of the comprehensive parking lot according to the reducible load of the comprehensive parking lot; total daily load curve S of production year grid_{Put into production}Superposed with the controllable daily load curve S3 to generate a load curve K after the on-production year grid control_{Put into production}Calculating the corresponding second-day maximum load P_{maxk-commissioning}If P is_{maxk-commissioning}≦W_{Put into production}In the near term, the capacity of the transformer substation does not need to be increased newly, but orderly charging is needed to be carried out, and the peak load is controlled; if P is_{maxk-commissioning}>W_{Put into production}Newly increasing the capacity of the transformer substation in the near term;

it can be understood that the yard adopts an ordered charging strategy to smooth the charging demand and reduce the peak load, taking a bus as an example, the bus is charged in the yard sequentially at night 23:00-1:00, the charging peak value appears at 0:00-1:00, if the ordered charging is adopted, the load at the charging peak value can be limited and shifted to the time period after 1: 00; however, the ordered charging is not suitable for influencing the charging quantity, and is not suitable for shifting across the electricity price time period, for example, a user plans to charge in a valley period to save charging fee, and is not suitable for shifting to a flat period or a peak period;

the reducible load amount can be formulated in advance by a vehicle yard side agreement, a demand side response and the like, and a comprehensive vehicle yard controllable daily load curve S3 is generated according to the reducible load amount corresponding to the 48 points; if the parking lot does not control the charging load, S3 is a straight line with 48 points with 0;

the development of the distant view load has certain uncertainty, and a certain margin should be reserved for the power supply capacity, so that the influence of the controllable load of the train yard is not considered in the distant view in the embodiment.

Step S15, generating a comprehensive yard power supply scheme suggestion according to the evaluation result of the steps S12-S14, wherein the comprehensive yard power supply scheme at least comprises one of the following:

synchronously constructing a transformer substation by combining the comprehensive yard;

the main transformer is not built in the near term, and the main transformer is built according to the load development in the long term;

newly adding planned substation distribution points in advance;

and (4) determining whether ordered charging is required by utilizing the power supply of the existing transformer substation.

Specifically, if newly increased transformer substation capacity is recommended in the evaluation result in both the long-term view and the production year, the power supply scheme is to combine the comprehensive yard to synchronously construct the transformer substation;

if only a distant view suggests newly increasing the capacity of the transformer substation, the power supply scheme reserves transformer substation land for combining the comprehensive vehicle yard, a main transformer is not built in the near future, and the distant view is built according to load development;

if the newly increased capacity of the transformer substation is only recently suggested, the power supply scheme is that planned transformer substation distribution points are newly increased in advance in a high-voltage distribution network grid of the comprehensive vehicle yard, including new construction or extension;

and if the capacity of the newly-added transformer substation is not needed in the near and long periods, the power supply scheme is to utilize the existing transformer substation for power supply and provide whether ordered charging is needed or not according to the evaluation result.

The implementation of the invention has the following beneficial effects:

the invention provides a power supply method of a comprehensive parking lot charging facility, which is based on gridding analysis and planning, considers controllable load influence, comprehensively analyzes factors such as near-term and far-term load development and power grid development and generates a reasonable power supply scheme suggestion. By implementing the invention, the power supply requirement of the three-dimensional comprehensive parking lot can be met, and the equipment utilization rate and the land utilization efficiency are improved simultaneously.

While the invention has been described in connection with what is presently considered to be the most practical and preferred embodiment, it is to be understood that the invention is not to be limited to the disclosed embodiment, but on the contrary, is intended to cover various modifications and equivalent arrangements included within the spirit and scope of the appended claims.

Claims (6)

1. A power supply method for an integrated yard charging facility, comprising the steps of:

step S10, generating a typical daily load curve S1 of the comprehensive parking lot according to the service vehicles of the comprehensive parking lot, the type, the power and the quantity of the charging piles;

step S11, according to the production time of the comprehensive parking lot and the high-voltage distribution network grid, generating a typical daily load curve S2 of the high-voltage distribution network grid of the production year of the comprehensive parking lot_{Put into production}And the power supply capacity W of the main transformer in the grid_{Put into production}Typical daily load curve S2 of high-voltage distribution network grid of distant view year_{Distant view}And the power supply capacity W of the main transformer in the grid_{Distant view}；

Step S12, the power supply margin of the distant view is evaluated, and the typical daily load curve S2 of the high-voltage distribution network grid corresponding to the distant view year is used_{Distant view}And the typical daily load curve S1 of the integrated parking lot_{Distant view}Overlapping to generate a total daily load curve S of the distant view annual grid_{Distant view}Calculating the corresponding daily maximum load P_{maxs-perspective}According to said daily maximum load P_{maxs-perspective}Determining whether the capacity of a newly added transformer substation is needed in a long term;

step S13, carrying out power supply margin evaluation of the production year, and carrying out typical daily load curve S2 of the high-voltage distribution network grid corresponding to the production year_{Put into production}And the typical daily load curve S1 of the integrated parking lot_{Put into production}Overlapping to generate a total daily load curve S of the production year grid_{Put into production}Calculating the corresponding first day maximum load P_{maxs-production}Determining whether the capacity of the newly increased substation is needed in the near future according to the maximum load on the first day;

step S14, performing controllable load evaluation, and generating a controllable daily load curve S3 of the comprehensive parking lot according to the reducible load of the comprehensive parking lot; total daily load curve S of production year grid_{Put into production}Superposed with the controllable daily load curve S3 to generate the post-production-year grid control loadLoad curve K_{Put into production}Calculating the corresponding second-day maximum load P_{maxk-commissioning}Determining whether the capacity of the newly increased transformer substation is needed in the near future according to the maximum load of the second day;

step S15, generating a comprehensive yard power supply scheme suggestion according to the evaluation results of the steps S12-S14, wherein the comprehensive yard power supply scheme at least comprises one of the following:

synchronously constructing a transformer substation by combining the comprehensive yard;

the main transformer is not built in the near term, and the main transformer is built according to the load development in the long term;

newly adding planned substation distribution points in advance;

and (4) determining whether ordered charging is required by utilizing the power supply of the existing transformer substation.

2. The method of claim 1, wherein in step S10, the accuracy of the load curve is acquired one or more times in half an hour.

3. The method of claim 2, wherein the step S12 further comprises:

if the total load of the distant view year grid is S_{Distant view}Corresponding daily maximum load P_{maxs-perspective}Grid power supply capability W ≦_{Distant view}Determining that the capacity of the transformer substation does not need to be newly increased in the long term;

if P is_{maxs-perspective}>W_{Distant view}And determining that the capacity of the newly added substation is needed in the long term.

4. The method of claim 3, wherein the step S13 further comprises:

if the total load of the production year grid is S_{Put into production}Corresponding daily maximum load P_{maxs-production}Grid power supply capacity W at production year_{Put into production}If yes, determining that the newly added transformer substation capacity is not needed in the near future, and the process goes to step S15;

if P is_{maxs-production}>W_{Put into production}The flow advances to step S14.

5. The method of claim 4, wherein the step S14 further comprises:

if P is_{maxk-commissioning}≦W_{Put into production}Determining that the capacity of the transformer substation does not need to be increased newly in the near term, but orderly charging is needed to be carried out, and controlling the peak load;

if P is_{maxk-commissioning}>W_{Put into production}And determining that the capacity of the newly added substation is required recently.

6. The method of claim 5, wherein the step S15 further comprises:

in the evaluation result, if newly increased transformer substation capacity is recommended in both the distant view and the production year, the power supply scheme is to combine the comprehensive yard to synchronously construct the transformer substation;

if only a distant view suggests newly increasing the capacity of the transformer substation, the power supply scheme reserves transformer substation land for combining the comprehensive vehicle yard, a main transformer is not built in the near future, and the distant view is built according to load development;

if the newly increased capacity of the transformer substation is only recently suggested, the power supply scheme is that planned transformer substation distribution points are newly increased in advance in a high-voltage distribution network grid of the comprehensive vehicle yard, including new construction or extension;

and if the capacity of the newly-added transformer substation is not needed in the near and long periods, the power supply scheme is to utilize the existing transformer substation for power supply and provide whether ordered charging is needed or not according to the evaluation result.

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