This paper presents an integrated route planning algorithm to provide optimal routes and corresponding charging schemes for EVs (Electric vehicles) users with different travel objectives based on spot price and traffic conditions. With the development of EVs, more users are facing difficulties to find a charging route that satisfy their demands. To solve the problem, the route planning algorithm is improved based on classified travel objectives, meanwhile the spot price forecast model is established to provide the user's economic assessment. Firstly, the classification of user's travel objectives is completed and the evaluation indicators are proposed. Secondly, a time-window electricity price forecasting based on the GRU (Gated recurrent unit) neural network is established to generate pricing information for route planning algorithm. Finally, SAA (Simulated annealing algorithm) is combined with A * (A-star) algorithm and Dijkstra algorithm to gain the integrated route planning algorithm. Also, the algorithm provides the users with optimal charging paths considering travel objective and price prediction. The results of the optimal routes are displayed on App (application) so that the users can choose their own charging paths and control EV's charging at any time. The simulations prove the effectiveness and accuracy of the proposed algorithm.INDEX TERMS Electric vehicle, spot price, route planning, travel objective, gated recurrent unit, A * algorithm, simulated annealing algorithm.

The operation prediction of wind farms will be accompanied by the need for massive data processing, especially the preprocessing of wind farm meteorological data or numerical weather prediction (NWP). Because NWP data are strongly correlated with wind farm operation, proper processing of NWP data could not only reduce data volume but also improve the correlations of wind farm operation predictions. For this purpose, this paper proposes a data preprocessing algorithm based on t-distributed stochastic neighbor embedding (t-SNE). Firstly, the data collected were normalized to eliminate the influence caused by different dimensions. The t-SNE algorithm is then used to reduce the dimensionality of the NWP data related to wind farm operation. Finally, the wind farm data visualization platform is established. In this paper, 22 index variables in NWP data were taken as objects. The t-SNE method was used to preprocess the NWP historical data of a wind farm, and the results were compared with the results of the principal component analysis (PCA) algorithm. It outperformed PCA in error precision; in addition, t-SNE dimension reduction preprocessing also had a visual effect, which could be applied to big data visualization platforms. A long short-term memory network (LSTM) was used to predict the operation of the wind farm by combining the preprocessed NWP data and the operation data. The simulation results proved that the effect of the preprocessed NWP data based on t-SNE on the wind power prediction was significantly improved.

No abstract

No abstract

With the advancement of a new round of power system reform and the continuous access to renewable energy, the auxiliary service market has received extensive attention as an important service to ensure the safe and reliable operation of the power grid. However, it is difficult for the automatic generation control (AGC) units in the system to meet real-time fastness requirements of the power market. Based on the premise that “market electricity” and “planned electricity” coexist under the background of new electricity reform, this paper focuses on the upgrade and reconstruction of AGC units in “planned electricity”. With capacity matching and speed matching as the planning objectives, the optimization and reconstruction algorithm and model of the AGC units are established. Taking capacity matching and speed matching as research targets, the optimization and reconstruction algorithm and model of the AGC units are established. Finally, the effectiveness of the model and the specific scheme of the AGC unit optimization and reconstruction are established through simulation.