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    25 November 2023, Volume 45 Issue 11
    Planning and Scheduling Strategy
    Research on the source-load-storage collaborative scheduling strategy for new energy accommodation based on Stackelberg game
    DU Yuze, DONG Haiying
    2023, 45(11):  1-9.  doi:10.3969/j.issn.2097-0706.2023.11.001
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    China's dual carbon target requires an increasing share of new energy in the power grid. To enhance the new energy consumption rate, a source-load-storage collaborative scheduling strategy based on Stackelberg game is proposed for the power system consisting of virtual power plants (VPPs), load aggregators (LAs), and energy storage systems (ESSs). The autonomous VPP serves as a leader at the upper level, while the LA with demand response capability, both a power purchaser and a consumer, acts as the follower at the lower level. A win-win situation can be achieved by new energy consumers and the source-load-storage system through a game of pricing and energy usage strategies between the upper and lower levels. The results of the case study on the proposed strategy show that it is possible to create the win-win situation between source, load and storage by taking time-of-use pricing and game theory, and to increase the new energy accommodation capacity. And ESSs can alleviate fluctuations of loads and new energy outputs, rise the return of VPPs at source end, lower the electricity costs of LAs with the premise of ensuring energy uses' satisfaction, ensure energy consumption at the load end, enhance the demand responsiveness of customers, and expand the room for new energy's grid connection. Taking distributed Genetic Algorithm and Quadratic Programming (GA-QP) in solving process is of good convergence speed and effectiveness,and able to protect the privacy of all parties in the game.

    Data-driven reactive power optimization algorithm for the distribution network with high proportion of renewable energy
    LIN Honghong, YU Tao, ZHANG Guiyuan, ZHANG Xiaoshun
    2023, 45(11):  10-19.  doi:10.3969/j.issn.2097-0706.2023.11.002
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    With the integration of massive distributed new energy into distribution networks, power loss and voltage deviation at nodes are becoming increasingly severe. The high requirements on high-proportion renewable energy distribution networks' adjustability can not be satisfied by traditional measures merely,such as installation of reactive power compensation devices, adjusting the voltage at the generator side. Therefore,the reactive power regulation capacities of different types of new energy generators in distribution networks are study deeply. The study analyses the objective function and constraint settings,and outlines a data-driven reactive power regulation algorithm. The algorithm can regulate node voltage and reduce power loss of the distribution network at the same time. Firstly,a mathematical model of reactive power optimization for the high-proportion new energy distribution network is constructed, and solved by various intelligent algorithms. Subsequently,the reactive power regulation solution sets obtained from the algorithms are used as training data for the deep learning long-short-term memory(LSTM)network. The trained network can predict reactive power regulation strategies efficiently based on the model above. Finally,the effectiveness and optimization performance of the proposed algorithm is validated by in an IEEE 14-bus system and an IEEE 33-bus system.

    Review on intelligent planning and decision-making technology for the new active distribution network
    WU Xueqiong, XIA Dong
    2023, 45(11):  20-26.  doi:10.3969/j.issn.2097-0706.2023.11.003
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    With the accelerating construction of new power system and popularity of active renewable distributed energy,passive distribution networks are moving towards active distribution networks quickly.However,renewable power is intermittent and uncontrollable,and the penetration of high-proportion renewable energy has brought serious threats to the safe and reliable operation of networks.Active distribution network is an effective solution for large-scale distributed energy grid connection and distribution network optimal operation.To maintain the optimal operation state of the power grid, scholars have conducted extensive researches about active distribution network management.The hot issues in this field include active distribution network planning,active distribution network intelligent decision-making,active distribution network power supply restoration and active distribution network load management. The progress made in these key technologies and the status quos of active distribution networks at home and abroad are analysed. And the analysis results show that the robust planning for active distribution networks taking uncertainties and temporal and spatial correlations into consideration is the development direction for the following studies.

    Control and Safety Strategy
    Smart home energy management based on artificial emotion LSTM algorithm
    YIN Linfei, LIU Jinyuan
    2023, 45(11):  27-35.  doi:10.3969/j.issn.2097-0706.2023.11.004
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    With the further deepening of China's social urbanization and the development of cities,there are shortages of social resources,especially power resources. Overload of electricity consumption forces power rationing in some districts to ease the pressure of municipal power supply. In this context,it is particularly important for users to manage and save energy autonomously. In order to enable users of household electricity to independently manage the usage of electric energy , realize two-way interaction between the power grid and user ends,and ensure the implementation of demand-side response, a smart home energy management method based on artificial emotion long short-term memory (AELSTM)network algorithm is proposed. This method is mainly composed of artificial emotional deep neural network(AEDNN)and long-short-term memory(LSTM)network. The combination of the two components allows humanized real-time monitoring and management of household electricity consumption.

    Fine non-invasive load monitoring based on CEEMD and GWO-LSTM
    LU Weiwei, YIN Linfei
    2023, 45(11):  36-44.  doi:10.3969/j.issn.2097-0706.2023.11.005
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    Aiming at the low accuracy of short-term thermal load prediction caused by the lag of central heating system and other factors, a fine non-invasive load monitoring method based on Complementary Ensemble Empirical Mode Decomposition (CEEMD) data processing technology and Gray Wolf Optimization and Long Short-Term Memory (GWO-LSTM) network is proposed. The collected raw data about heat load are decomposed into several stationary intrinsic mode functions (IMFs) by CEEMD, and each IMF is modelled and predicted separately. Then,the final prediction result is obtained by superimposing the predicted values of each IMF. To improve the prediction accuracy, GWO is used to optimize the number of neurons in the hidden layer, the number of training times, and the initial learning rate of the LSTM, then the CEEMD-GWO-LSTM prediction model for short-term heat load is established. Simulation experiments were conducted on the simple LSTM model and CEEMD-LSTM model. The experimental results showed that the root mean square error(RMSE), mean absolute error(MAE), and mean absolute percentage error (MAPE)of the prediction made by CEEMD-GWO-LSTM model were 0.591 5 MW, 0.460 2 MW, and 8.083 8%, respectively, which were significantly lower than that of other models.

    Electrical Economy and Trading
    Evolutionary game behavior and decision-making between power generation companies and power grid companies under the agent purchasing mechanism in bidding process
    CHENG Lefeng, PENG Pan, CHEN Dongli
    2023, 45(11):  45-54.  doi:10.3969/j.issn.2097-0706.2023.11.006
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    Based on the roles of power grid enterprises playing in the power market and the game between two power supply enterprises, a three-party evolutionary game model for heterogeneous enterprises and power grid in power purchasing mode is established under which the supply exceeds the demand. Since the information asymmetry of the sellers and purchasers,both sides follow compensation mechanisms to minimize their own risks and maximized their benefits. The game behaviors of the bidding in the electricity market are analyzed under two bidding mechanisms: market clearing price (MCP) and pay-as-bid (PAB). The research findings are as follows: Under MCP mechanism, the three-party game system takes two evolutionarily stable strategies (ESSs) for bidding immune to compensation. Changing the compensation coefficient only affects the path of convergences to different ESSs. Under PAB mechanism, adjusting the compensation coefficient leads to different ESSs, the price of electricity under the PAB mechanism is lower than that under the MCP mechanism under certain conditions.

    Pricing for shared energy storage strategy on the demand side of power grid based on Nash equilibrium theory
    CUI Jindong, ZHU Zengchen, LI Ruotong
    2023, 45(11):  55-61.  doi:10.3969/j.issn.2097-0706.2023.11.007
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    With the advancement of the construction of new power systems, small energy storage devices on the user side have become increasingly important. However, their disorder charging and discharging behaviors not only pose safety hazards to the power grid, but also cause resource waste. Based on this, a joint scheduling mode for small energy storage devices on the user side is proposes,which are integrated on an energy storage aggregator cloud service platform. The optimal operation models for energy storage operators, energy storage device investors, and the power grid are established. Based on Nash equilibrium theory, a cooperative game model for all participating entities under their constraints is established. In a numerical simulation analysis,the optimal pricing scheme for shared energy storage devices is obtained by model solving. The results indicate that the optimal pricing scheme can not only achieve the goals of peak load regulation and resources saving, but also lead to a win-win situation among the three participating entities. The feasibility and scientificity of the proposed pricing mechanism have been proven.

    A day-ahead market pricing model for load aggregators based on potential game
    MEI Wenqing, LIU Xiaofeng, WANG Jiacheng, TAN Mengling
    2023, 45(11):  62-69.  doi:10.3969/j.issn.2097-0706.2023.11.008
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    As residential electricity consumption continues to increase and new power systems are under construction, demand response has become an important means to ensure the safety and stability of the superior power grid,and higher requirements on demand side are proposed by the power grid. Load aggregators play an increasingly important role as the intermediary between the system and users. To keep the stability of the aggregators' day-ahead bidding market and motivate users to participate in demand response, the load resources participating in demand response are taken as generalized demand-side resources. Then, a demand response mechanism based on price incentives is proposed, and a hierarchical trading model including the superior grid, load aggregators and users is established based on game theory and potential game. The revenue models of users and load aggregators are made based on the user response mechanism and day-ahead market bidding mechanism. The models can simplify the multi-objective optimization problem to single-objective convex quadratic programming problems through function construction. The proposed algorithm can converge to Nash equilibria in a short time and maintain the convergence under large-scale demand responses. Proven by the practical cases, the proposed model can improve the profit of load aggregators and the revenue of users at the same time.

    Comprehensive benefit evaluation for Energy Internet park projects based on combined weight of game
    SHEN Rongrong, JIANG Feng, WEI Zequan, LIU Shimin, QI Ze
    2023, 45(11):  70-81.  doi:10.3969/j.issn.2097-0706.2023.11.009
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    With the energy revolution,the proposal of the "Internet +" strategy, and the growing of renewable energy,Energy Internet,as a new energy application format,has gradually become an driver for energy transformation. To measure the comprehensive benefit of an Energy Internet park project,an evaluation model is constructed. A comprehensive benefit evaluation system for an Energy Internet park project covers four dimensions, economic benefit,social benefit,environmental benefit,and promotional value. Then, the comprehensive weights for the indicators are obtained by balancing the subjective and objective weights generated by Entropy Weight Method(EWM)and Bayesian Best and Worst Method(BBWM)with game theory. The comprehensive weights reflect all data and indicators mentioned. The comprehensive benefit evaluation model for Energy Internet park projects based on Measurement Alternatives and Ranking according to the Compromise Solution(MARCOS) is constructed. Taking a comprehensive benefit evaluation system for a microgrid in Beijing as the example,it is found that the clean energy consumption rate, payback period,and power supply reliability are three key indicators that affect the annual comprehensive benefit of the project. Finally,the robustness of the proposed model is demonstrated through sensitivity analysis and ranking consistency testing.

    Research on the pricing mechanism of pipelines' utility tunnel entering cost based on grey group clustering and CRITIC combined weighting
    XU Xiaojun, LI Kui, ZHANG Fangyin, ZHOU Yang, YE Fei, GUAN Qianfeng, MI Lele
    2023, 45(11):  82-89.  doi:10.3969/j.issn.2097-0706.2023.11.010
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    Underground laying method is recommended in municipal grid construction and upgrading, and reasonable pricing mechanism for the pipelines' utility tunnel entering cost is significant to the utility tunnel construction. The existing charging mechanism is flawed in allocation coefficients' calculation. Thus, a cost allocation model based on grey group clustering and CRITIC combined weighting is proposed. First of all, the cost-sharing indicators of all parties entering the tunnel are determined based on the principle of beneficiary payment. Then, the subjective weight coefficients and objective weight coefficients of different apportionment indexes are calculated based on grey group clustering and CRITIC, respectively. Finally, considering the subjective and objective weighting data, the combined weight of each apportionment index is calculated based on the sum of squares of deviations. The proposed model is applied to a pipelines' utility tunnel entering cost allocation scheme, and the case study verify the effectiveness of the proposed method.