CN114037480A - New-energy vehicle charging pile demand prediction and deployment optimization method for new city - Google Patents
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Abstract
The invention discloses a new-energy vehicle charging pile demand prediction and deployment optimization method for a new city, which uses a city migration learning paradigm, utilizes city migration knowledge with rich historical data to help a target city to predict user demands of a candidate deployment scheme, and simultaneously utilizes a heuristic thought to provide a new model of prediction-planning iterative interaction and a corresponding efficient solution method, quickly searches an optimal solution in an explosive scheme combination, and ensures the preference and convergence of the method. The method of the invention simultaneously carries out prediction and planning, ensures the optimization tendency and convergence of the deployment scheme adjusting process, improves the solving efficiency by a heuristic method, greatly reduces the time required by optimization, simultaneously uses the dynamic planning thought to search the optimal solution in the iterative process, and really realizes the synchronous demand prediction and the charging pile deployment scheme optimization.
Description
Technical Field
The invention relates to the technical field of urban calculation, urban planning and new energy vehicles, in particular to a new city-oriented new energy vehicle charging pile demand prediction and deployment optimization method.
Background
The method for predicting the charging demand of the charging pile deployed in a new city is mainly divided into two types: prediction from implicit data and prediction from explicit data.
1. And predicting according to implicit data. The method mainly comprises the following steps: and modeling the association between the parking demand, population distribution, traffic flow, refueling record and the charging demand by using implicit data which is associated with the charging demand, such as the parking demand, population distribution, traffic flow, refueling record and the like, and further calculating the charging demand of the new city. The implicit data and the charging demand data have different natural attributes, which bring substantial space-time mobility differences, and the predicted charging demand is very easy to make mistakes.
2. And predicting according to the explicit data. The method mainly comprises the following steps: and calculating the charging requirement of the whole city through the acquired partial charging requirement data. For example, a charging trajectory is extracted from the traveling trajectories of a plurality of charging cars to obtain the distribution of charging demands; or the transaction data is crawled from the charging transaction platform, and point of interest information (POI) corresponding to the charging station is combined to serve as the charging requirement. However, in a completely new city, it is almost impossible to directly acquire such explicit data.
However, when a new city is faced, a charging vehicle needs to be popularized in the new city, and then a charging station needs to be deployed in the city, and we naturally expect that the deployment of the charging station can bring greater benefit, so we need to deploy according to the charging requirement of the city, but because the new city lacks historical data of the charging station, the charging requirement of the city cannot be predicted, and further an optimal deployment scheme cannot be selected from a candidate charging station set.
The definition of the charging pile deployment optimization is as follows: for a group of candidate schemes, the maximum benefit which can be obtained in each scheme is automatically calculated, and then the optimal solution is found from the whole candidate scheme set. From the optimization goal, the existing work mainly aims at maximizing the social benefits of the charging station, for example, meeting the charging requirements of the vehicle owners as much as possible and reducing the queuing waiting time.
The invention aims to solve the problem of predicting the charging demand and optimizing the deployment scheme under the condition of no charging data when a charging station is deployed in a new city.
Disclosure of Invention
Aiming at the problems, the invention provides a new energy vehicle charging pile demand prediction and deployment optimization method for a new city.
In order to achieve the above purpose, the invention provides the following technical scheme:
a new-energy-vehicle charging pile demand prediction and deployment optimization method for a new city comprises the following steps:
S2, charging pile distribution according to source cityTarget city charging pile distributionSource city data DSCTarget city data DTCTraining a charging demand prediction model and predicting charging demand distribution of a target city
S3, calculating daily average revenue R of current charging pile distribution by using prediction resultTC;
S4, giving a revenue increase threshold value theta, if RTCTheta is less than or equal to theta, the process is finished, and the distribution of the charging piles in the current target city is returnedOtherwise, executing step S5;
S6, pairTraversing, and predicting by using a charging demand prediction model to obtain a new charging demand;
s7, searching by dynamic planning thoughtOptimal solution of (2), toCarrying out primary updating; it jumps to step S2.
Further, the charging demand prediction model comprises a context module, a portrait feature module, a demand prediction module and a field self-adaption module: wherein the context characteristics of each charging station in the source city and the target city are input into the context module and output as context characteristics fc(ii) a The portrait characteristics of each charging station of the source city and the target city are input into the portrait characteristic module and outputp(ii) a Context feature fcAnd portrait features fpCombining the obtained site joint characteristics f, inputting the site joint characteristics f and the time intervals into a demand prediction module, and outputting the charging demand containing the charging demand in each time intervalSite association feature f input domain adaptive module, output domain tagIndicating the domain to which the site feature belongs.
Further, the context module is composed of a convolution block, a spatiotemporal attention module, a convolution block and a global pooling layer in sequence, wherein each convolution block comprises a convolution layer, a normalization layer and a ReLU activation function.
Further, the image feature module is composed of two fully connected layers with a ReLU activation function.
Furthermore, the demand forecasting module consists of an embedding layer, two full-connection layers and a full-connection layer, the time interval is converted into an array q through the embedding layer, the site characteristics connect the output result with the q through the two full-connection layers, and then the output result is input into the full-connection layer to obtain the forecasting result.
Further, the demand prediction module loss function:
Ldemand=(1-α)Lreg+αLrank
wherein L isregRepresents the mean square error, LrankIndicating a ranking error.
Further, LregThe calculation formula of (2) is as follows:
SSCindicating the charging requirements of the source city and,and y represents the predicted and true values of the target city charging demand, respectively.
Further, LrankThe calculation formula of (2) is as follows:
wherein, PijRepresenting y in the truth of the target cityiRatio yjThe probability of the higher ranking is that,indicating y in the predictioniRatio yjHigher probability of ranking, PijThe calculation formula of (2) is as follows:
oij=yi-yj(yi>yj)。
further, the domain adaptation module is composed of two fully connected layers.
Further, the loss function of the domain adaptation module is:
wherein: d is a domain label and the domain name is,is a predicted domain label, S ═ Ssc∪STC,Andis a weight parameter that is a function of,andis a deviation parameter.
Compared with the prior art, the invention has the beneficial effects that:
the new-energy-vehicle charging pile demand prediction and deployment optimization method for the new city, provided by the invention, uses a city migration learning paradigm, utilizes city migration knowledge with rich historical data to help a target city to predict user demands of a candidate deployment scheme, and simultaneously utilizes a heuristic thought to provide a new model of prediction-planning iterative interaction and a corresponding efficient solution method, so that an optimal solution is rapidly searched in an explosive scheme combination, and the trend and the convergence of the method are ensured. The method of the invention simultaneously carries out prediction and planning, ensures the optimization tendency and convergence of the deployment scheme adjusting process, improves the solving efficiency by a heuristic method, greatly reduces the time required by optimization, simultaneously uses the dynamic planning thought to search the optimal solution in the iterative process, and really realizes the synchronous demand prediction and the charging pile deployment scheme optimization.
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In order to more clearly illustrate the embodiments of the present application or technical solutions in the prior art, the drawings needed to be used in the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments described in the present invention, and other drawings can be obtained by those skilled in the art according to the drawings.
Fig. 1 is a schematic flow diagram of a new energy vehicle charging pile demand prediction and deployment optimization method for a new city.
Detailed Description
For a better understanding of the present solution, the method of the present invention is described in detail below with reference to the accompanying drawings.
1. Problem scenario
Now, if a new city needs to be popularized, charging stations need to be deployed in the city. We naturally expect that the deployment of the charging stations can bring greater benefits, so we need to deploy according to the charging needs of the city, but because a new city lacks the historical data of the charging stations, the charging needs of the city cannot be predicted, and further, an optimal deployment scheme cannot be selected from a candidate charging station set.
2. Problem definition
We define: charging stationWherein liIs ciThe geographical location of the mobile station (c),andare respectively ciThe number of the medium slow filling piles and the fast filling piles,andare respectively at ciThe cost of deploying one slow-fill pile and one fast-fill pile,andrespectively represent CiThe service prices of the slow-fill pile and the fast-fill pile in the time interval T.Andrespectively represent ciThe utilization of the slow and fast charging piles during the time interval T is used in the present problem to represent the charging demand of the charging station.
We consider two cities: source city, charging stations have been deployed, and the set of charging stations is marked as CsC. Each deployed charging station c in the source cityi∈CSCIs known. Target city, no charging stations yet deployed, a candidate deployment partyRecord as CTC. Candidate charging stations c in the target cityi∈CTCOnly is provided withThese 5 attributes are known.
We use collectionsTo represent a target city deployment scenario CTCThe number of slow-charging and fast-charging piles of each station.Is represented by CSCThe number of slow-charging and fast-charging piles of each station. DSCAnd DTCThe method is used for representing multi-source situation data in a source city and a target city respectively, namely POI data, road network data and traffic data.
We propose a charge demand prediction model f, givenDSCAnd DTCAnd charging demand of source cityUnder the condition of (1), minimizing the predicted value of the charge demandWith the true value YTCThe error between, namely:
deployment scheme for solving target city on the basisGiven CTC,YSC、DSC、DTCUnder the conditions of the charging demand prediction method f and the budget upper limit B, the revenue R is maximized and the deployment cost does not exceed the budget upper limit B, that is:
3. charging demand prediction model
The architecture of the charging demand prediction model is shown in fig. 1, and the charging demand prediction model is composed of four components, which are respectively: context module, portrait feature module, demand forecast module, domain self-adapting module.
1) Context module
Module input: all the context characteristics of each charging station in the source city and the target city include POI, road network characteristics, traffic characteristics of the charging station and its neighbor charging stations.
And (3) module output: context feature fc。
The module structure is as follows: volume block + spatio-temporal attention module + volume block + global pooling layer. Each convolution block contains one convolution layer, one normalization layer, and one ReLU activation function. The input for each volume block isThen outputting:
wherein WcAnd bcAre all learnable parameters, representing convolution operations,BN stands for batch normalization. To avoid overfitting, the discard operation will be enabled after the first volume block. The spatial attention module is used to encode the spatial correlation. The second convolution module is used to improve performance. The global pooling layer is used to reduce feature dimensionality.
2) Portrait feature module
Module input: and (3) portrait characteristics of each charging station of the source city and the target city, namely charging pile information of the charging stations per se and the neighbor charging stations.
And (3) module output: image feature fp。
The module structure is as follows: two fully-connected layers with a ReLU activation function.
3) Demand forecasting module
Module input: site association feature f (by f)cAnd fpCombined) and time intervals.
The module structure is as follows: the time interval is converted into an array q by an embedding layer. And the site characteristics connect the output result with q through two full-connection layers, and then input the output result into one full-connection layer to obtain a prediction result.
Loss function: l isdemand=(1-α)Lreg+αLrank
Wherein L isregRepresenting mean square error, SSCIndicating the charging requirements of the source city and,and y represents the predicted and true values of the target city charging demand, respectively.
LrankIndicating a ranking error. Wherein, PijRepresenting y in the truth of the target cityiRatio yjThe probability of the higher ranking is that,indicating y in the predictioniRatio yjHigher probability of ranking.
oij=yi-yj(yi>yj)
4) Domain adaptive module
Module input: site association feature f (by f)cAnd fpCombine to get)
The module structure is as follows: two fully connected layers.
wherein: d is a domain label and the domain name is,is a predicted domain label, S ═ Ssc∪STC,Andis a weight parameter that is a function of,andis a deviation parameter.
For the entire charge demand prediction module, our goal is to minimize LregAnd LrankTo maximize Ldomain. The final joint loss function is:
L=(1-α)Lreg+αLrank-βLdomain
4. charging pile deployment scheme optimization module
Module object: and in a given candidate charging station position set, the number of the fast-slow pile piles of each charging station is adjusted, and the daily income is maximized under the condition that the final total cost is not more than the upper limit B.
Module input: revenue growth threshold θ, total budget B, source city data DSCSource city charging pile distributionTarget city data DTC
Constructing a candidate set: if the number of the fast and slow charging piles of a certain charging station is (n)SF,nSs), defining a candidate set NiComprises the following steps:
the new-energy-vehicle charging pile demand prediction and deployment optimization method for the new city comprises the following steps:
(2) According toDSC、DTCTraining a charging demand prediction model f and predicting the charging demand distribution of a target city
(3) Calculating daily average revenue R of current charging pile distribution by using prediction resultTC;
(4) If R isTCTheta is less than or equal to theta, the process is finished, and the distribution of the charging piles in the current target city is returnedOtherwise, executing the step (5);
(7) looking up by dynamically planned thoughtOptimal solution of (2), toAn update is performed. And (4) jumping to the step (2).
The method realizes the prediction of the charging demand of the target city by using the historical data of the public charging station of the source city. The implicit data set is used for calculating the charging requirement of the target city, the intrinsic space-time mobility difference is brought by the difference of natural attributes among data, and the predicted charging requirement is very prone to errors. For new cities, explicit data is difficult to collect. According to the method and the device, charging data of the source city are used, multi-source data such as POI of the source city and POI of the target city are combined, image characteristics and situation characteristics which can be distinguished are learned, and then the charging requirement of the target city is predicted. Meanwhile, a domain adaptive network is introduced to guide the network to learn high-level semantic features irrelevant to the city. In the aspect of model design, the space-time characteristics of the charging behaviors are kept, meanwhile, the influence of the road network information, POI information, traffic information and other context characteristics on the charging behaviors is considered, and the mutual influence among the charging stations is introduced. Meanwhile, a domain self-adaptive network is introduced aiming at the domain deviation problem in the urban transfer learning, so that the distribution deviation of an input space caused by the change on an observation system is reduced. Therefore, the charging demand prediction method and the charging demand prediction device achieve the charging demand prediction under the condition that no target city charging data exists.
The method of the invention simultaneously carries out prediction and planning, ensures the optimization tendency and convergence of the deployment scheme adjusting process, and improves the solving efficiency by a heuristic method. In one iteration of the optimized deployment scenario, there are 5 candidate scenarios per site, which results in a totalNew deployment scenarios, where training and prediction are individually performed for each deployment scenario, are unacceptable. The application only carries out 1 training and 5| C in one iteration processTCPrediction of degree I, greatly reducingThe time required by optimization is reduced, meanwhile, the optimal solution in the iterative process is searched by using a dynamic planning idea, and the synchronous demand prediction and the optimization of the charging pile deployment scheme are really realized.
The above examples are only intended to illustrate the technical solution of the present invention, but 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: it is to be understood that modifications may be made to the technical solutions described in the foregoing embodiments, or equivalents may be substituted for some of the technical features thereof, but such modifications or substitutions do not depart from the spirit and scope of the technical solutions of the embodiments of the present invention.
Claims (10)
1. A new-energy-vehicle charging pile demand prediction and deployment optimization method for a new city is characterized by comprising the following steps:
S2, charging pile distribution according to source cityTarget city charging pile distributionSource city data DSCTarget city data DTCTraining a charging demand prediction model and predicting charging demand distribution of a target city
S3, calculating daily average revenue R of current charging pile distribution by using prediction resultTC;
S4, giving a revenue increase threshold value theta, if RTCTheta is less than or equal to theta, the process is finished, and the distribution of the charging piles in the current target city is returnedOtherwise, executing step S5;
S6, pairTraversing, and predicting by using a charging demand prediction model to obtain a new charging demand;
2. The new-city-oriented new-energy-vehicle charging pile demand prediction and deployment optimization method according to claim 1, wherein the charging demand prediction model comprises a context module, a portrait feature module, a demand prediction module and a field self-adaption module: wherein the context characteristics of each charging station in the source city and the target city are input into the context module and output as context characteristics fc(ii) a The portrait characteristics of each charging station of the source city and the target city are input into the portrait characteristic module and outputp(ii) a Context feature fcAnd portrait features fpCombining the obtained site joint characteristics f, inputting the site joint characteristics f and the time intervals into a demand prediction module, and outputting the charging demand containing the charging demand in each time intervalThe site association feature f is input to a domain adaptation module,output domain labelIndicating the domain to which the site feature belongs.
3. The new-energy-vehicle charging-pile demand prediction and deployment optimization method for the new city according to claim 2, wherein the context module sequentially comprises a convolution block, a spatio-temporal attention module, a convolution block and a global pooling layer, and each convolution block comprises a convolution layer, a normalization layer and a ReLU activation function.
4. The new-city-oriented new-energy-vehicle charging pile demand prediction and deployment optimization method according to claim 2, wherein the image feature module is composed of two full-connection layers with a ReLU activation function.
5. The new-energy-vehicle-charging-pile demand forecasting and deployment optimizing method for the new city according to claim 2, wherein the demand forecasting module is composed of an embedded layer, two fully-connected layers and a fully-connected layer, a time interval is converted into an array q through the embedded layer, site characteristics are connected with the q through the two fully-connected layers, and then the output result is input into the fully-connected layer to obtain a forecasting result.
6. The new-city-oriented new-energy vehicle charging pile demand forecasting and deployment optimizing method according to claim 2, characterized in that a demand forecasting module loss function:
Ldemand=(1-α)Lreg+αLrank
wherein L isregRepresents the mean square error, LrankIndicating a ranking error.
7. The new city-oriented new energy vehicle charging pile demand prediction and deployment optimization method according to claim 6, wherein L is LregThe calculation formula of (2) is as follows:
8. The new city-oriented new energy vehicle charging pile demand prediction and deployment optimization method according to claim 6, wherein L is LrankThe calculation formula of (2) is as follows:
wherein, PijRepresenting y in the truth of the target cityiRatio yjThe probability of the higher ranking is that,indicating y in the predictioniRatio yjHigher probability of ranking, PijThe calculation formula of (2) is as follows:
oij=yi-yj(yi>yj)。
9. the new-city-oriented new-energy-vehicle charging pile demand prediction and deployment optimization method according to claim 2, wherein the domain self-adaptation module is composed of two full-connection layers.
10. The new-city-oriented new-energy-vehicle charging pile demand prediction and deployment optimization method according to claim 2, wherein the loss function of the field adaptive module is as follows:
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