Abstract
With the increasing diversification of human energy consumption forms in the integrated energy market, analyzing the comprehensive energy consumption behavior of user groups according to their changing energy demand characteristics is an important issue to be urgently addressed. To solve this problem, an analysis method of user’s comprehensive energy consumption behavior based on the evolutionary game is proposed in this article. First, three types of users including residents, large industries, and commercial users are considered for this purpose. Then, a utility model which takes into account the energy consumption characteristics of these users and their comfort factors is constructed based on the subjective and objective combination weighting method. Thereafter, an evolutionary game theory is used to analyze the dynamic selection process for users by selecting energy suppliers and then using the selection results when the evolutionary equilibrium is reached. Finally, the model is solved by using a distributed iterative method. The correctness and validity of the proposed method are verified by the simulation results.
1 Introduction
With the deepening of the energy crisis, the integrated energy system, which can break the heterogeneous energy barrier and improve comprehensive energy consumption efficiency (Yu et al., 2016; Ai and Hao, 2018; Chen et al., 2020) has developed rapidly in the recent years. With the gradual advancement of the comprehensive energy marketization process, people have more and more diversified energy forms available to them in the process of energy consumption, such as natural gas, electric energy, coal, etc (Cui et al., 2019). On a longer time scale, people’s energy consumption load may shift between different forms of energy (Boutaba et al., 2018; Huang et al., 2019). Therefore, for an integrated energy system, different forms of heterogeneous energy will form new coupling nodes (Zeng et al., 2018) on the user side by linking people’s energy consumption behavior (Yang et al., 2022a). In the aforementioned context, it is of great theoretical and practical significance (Yang and Wang, 2016; Liu et al., 2019) to study users’ choice behavior of different forms of energy for the planning and operation of the future integrated energy system (Yang et al., 2021a; Yang et al., 2021b; Yang et al., 2022b).
Thus, this study proposes a comprehensive user energy consumption behavior analysis method based on the evolutionary game. First, a utility model is constructed according to the subjective and the objective combination weighting method taking into account the residential, large industrial, and the commercial users as the main users. This model is based upon their energy consumption characteristics and comfort level factors (Guan and Pu, 2010). On this basis, a game model is proposed to describe the dynamic process of user energy consumption choice based on the evolutionary game method. Finally, Jorgen (2015) the distributed iterative method is used to solve the model, and then the evolutionary equilibrium result is obtained (Samadi et al., 2012). Compared with the traditional method, the proposed method is more accurate and effective as it fully considers the dynamic evolutionary game process when users choose to consume different forms of energy. The results verify the effectiveness of the proposed method. Therefore, the research can provide a reference for energy suppliers to formulate a reasonable pricing strategy.
2 User utility index construction
This study comprehensively considers the reaction mechanism of users towards energy prices and incentive policies in the integrated energy market. It constructs the user utility evaluation index system from the angle of energy consumption characteristics and the user psychology, which mainly consists of the following four indicators: comprehensive energy consumption cost (B1), energy supply occupancy (B2), energy supply reliability rate (B3), and user comfort level (B4).
2.1 Comprehensive energy consumption cost
The energy price of different energy types will directly affect the energy consumption cost of users which will further affect users’ energy consumption choices. Furthermore, the transformation cost of the user in the process of changing the energy type will also affect their energy choice decision. Therefore, this research studies the comprehensive energy consumption cost from the perspective of different types of user groups, including energy consumption cost and transformation cost. First, the research period is set as T, and in the research period, if m type users choose energy type n, then the comprehensive energy consumption cost of m type users choosing energy type n is illustrated as follows:
In the aforementioned formula: is the total energy consumption cost of an m-type user selecting energy type n, is the total transformation cost of an m-type user selecting energy type n, and is the actual energy consumption load of an m-type user selecting energy type n in period t.The calculation formula of energy consumption cost for each period when m type users select energy type n is as follows:
In the aforementioned formula: is the selling price of energy type n in time period t.
in Eq. 1 contains the equipment installation cost of the user selecting a certain energy type for the first time and the equipment transformation cost after selecting a new energy type.
Taking into account the equipment differences caused by the conversion of electricity to natural gas, then the natural gas to heat and other energy sources as well as the user’s equipment removal and installation costs, the specific formula is as shown as follows:
In the formula stated previously: stands for the direct installation cost of the equipment generated by the user’s first choice of an energy type; is the direct cost of new installation of the equipment of energy type n; represents the user-side equipment transformation cost generated by energy using the equipment transformed by other forms of energy (i.e., dismantling of original equipment and installation of new equipment); stands for the cost of dismantling old equipment and installing new equipment after the energy type changes from c to n; is the energy supply occupancy rate of energy type n selected by m type users at time t (t = 2, 3…n); is the energy supply occupancy rate corresponding to the user’s first selection; takes the positive value from the variation of the before and after energy supply occupancy rates, so .
2.2 Energy supply occupancy
The energy supply occupancy in the integrated energy market reflects the image of energy suppliers in the market, which indirectly affects the decision-making of user energy consumption. In general, the energy supply occupancy is closely related to the user’s choice of energy consumption. Thus, this study is divided based on user type and load usage, and the specific formula is as follows:
In the formula: is a total load of m-type users in the research period.
2.3 Energy supply reliability rate
The reliability rate of the energy supply directly reflects the energy supply level of the supplier. Longer the effective energy supply times of the supplier, the better the reliability of the energy supply, and correspondingly, the higher the probability of users choosing this type of energy. This study uses the ratio of the user’s valid time of energy supply to the research period as an indicator of reliability of energy supply, and the formula is as follows:
In the formula: is the average energy failure time of energy type n (unit: hour/user type). depicts the energy supply time of energy type n (unit: hour).
2.4 User comfort level
In the user’s decision-making process to choose different types of energy, their energy consumption experience, and their comfort level changes with the influence of external factors. The reference (De Greve et al., 2017) describes user comfort level in the form of quadratic function, exponential function, and logarithmic function. In this study, an exponential function considering the influence of environmental factors is used to characterize the user comfort level, and the formula is illustrated as follows:
\In the formula: is the profit coefficient of user comfort level, is the user’s energy consumption experience coefficient, is the energy supply occupancy rate of energy type n selected by m-type users, and is the random quantity related to external factors, ∈ (0,1).
3 User energy consumption behavior decision based on the evolutionary game
The construction of the user utility function needs to consider multiple indexes. Each index has a different influence on the user utility index system. Therefore, it is necessary to determine the influence of each index in the decision-making process of different types of user groups by applying the weight coefficient (Jalali and Kazemi, 2015). At present, the subjective weighting method and the objective weighting method are usually used to determine weight. However, in this study, the method of combination weighting is used to calculate the weight index (Guo et al., 2017). The analytic hierarchy process and the coefficient of variation are respectively used to calculate the subjective and objective weight values of the user utility index.
The evolutionary game is used to analyze users’ comprehensive energy consumption behavior. Electricity, natural gas, and heat suppliers first release the energy supply information to the users, then calculate their utility of energy type selection and update their game strategy based on this. The energy supplier will update the energy supply occupancy rate according to the current user ’group’s selection status and then release it to the users. Both sides achieve the final evolutionary equilibrium in the process of the evolutionary game (Cheng and Yu, 2018). Figure 1 shows the relation of the evolutionary game.
FIGURE 1
Setting as the proportion of m type users choosing energy type n at time t, satisfies that and . The group’s state of m-type users can be expressed as . The user group state in the region can be expressed by matrix X:
In the process of energy type selection, users will constantly update the utility function and optimize their own strategies according to the utility function (Xiao, 2010). Therefore, this article introduces the correction factor in order to represent the proportion of m-type users transferring from strategy q to strategy n. At any random point in time, each user can transfer proportionally from strategy q to strategy n by the factor . It has been assumed that all users modify their own strategies. The dynamic change process of user group state X shown previously can be described by a differential equation. The specific formula is as follows:
In the Eq. 9, the first and the second item on the right side of the equation represents the proportion of m-type users who transfer from other strategies to strategy n and those who change from strategy n to other strategies. Where, is related to the current user utility function and user group state. In order to construct the mathematical relationship between the user selection ratio and the optional strategy, the Logit discrete choice model [28] is used to solve the problem, and the formula is as follows:
By substituting the aforementioned equation into Eq. 9, the final dynamic change formula of the user group is as follows:
Since the heat consumption of large industrial users and the natural gas and heat consumption ratio of commercial users are limited by actual production, the load absorption capacity is limited. The aforementioned load constraint conditions are as follows:
4 Example analysis
4.1 Example explanation
In this study, the dynamic selection behavior between residential, large industrial, and commercial user groups (M = 3) and electricity, natural gas, and heat suppliers (n = 3) is simulated. The simulation program used MATLAB R2016a to calculate the evolutionary game model of chapter 3. The research period is 1 day, and = 1 h which is divided into 24 periods. At the same time, the distributed iterative algorithm is used to calculate the evolutionary equilibrium.
For the convenience of calculation due to the difference in energy load units of different forms of energy,, this study unified the energy load units of electricity, natural gas, and heat according to the conversion standard between different energy sources and standard coal (Feng, 2011). Specific energy load data (typical daily energy load data) was quoted from reference [29]. Table 1 shows the parameters and in indicator B1. The average failure time of the parameter in indicator B3 is 0.5 for the electricity supplier, 0.86 for the heat supplier, and 1.05 for the natural gas supplier.
TABLE 1
| Weight user type | ||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Resident | 0.380 | 0.353 | 0.369 | 0.120 | 0.150 | 0.132 | 0.250 | 0.223 | 0.239 | 0.250 | 0.274 | 0.260 |
| Large industry | 0.083 | 0.096 | 0.088 | 0.350 | 0.342 | 0.347 | 0.350 | 0.346 | 0.348 | 0.217 | 0.216 | 0.217 |
| Commerce | 0.281 | 0.243 | 0.228 | 0.033 | 0.065 | 0.046 | 0.468 | 0.463 | 0.466 | 0.218 | 0.229 | 0.260 |
| Parameter value in indicator | ||||||||||||
| Weight user type | /yuan | /yuan | ||||
| Electricity supply | Heat supply | Natural gas supply | Electricity supply | Heat supply | Natural gas supply | |
| Resident | 1900 | 1750 | 1,600 | 2,300 | 2,100 | 2000 |
| Large industry | 2000 | 1,500 | 1,400 | 2,600 | 1900 | 1700 |
| Commerce | 1800 | 1,600 | 1900 | 2,350 | 2000 | 2,700 |
Weight of index and parameter value of different types of users.
In order to avoid the influence of large fluctuation of energy load on the evaluation results, in this study is 0.6, which can be adjusted according to the actual situation. Table 1 shows the subjective and objective weight values, and combined weight values of each utility index based on the combination weighting method.
4.2 Simulation results and analysis
The evolutionary game method is used to calculate the model of the user’s energy choice. The energy supply occupancy rates of electric, heat, and natural gas energy types in the initial state are set as (0.27, 0.42, 0.31) and (0.33, 0.33, 0.33) respectively. The comprehensive energy selection results of the three types of user groups are calculated respectively, as shown in Figure 2.
FIGURE 2
According to Figure 2, the selection process of residential, large industrial, and commercial user groups all converge iteratively. Furthermore, the evolutionary equilibrium results obtained by the aforementioned three types of user groups are the same under the initial state of two different energy supply occupancy rates. It indicates that the user group’s selection of different energy types is unrelated to the initial state of energy supply occupancy.
Also according to Figure 2, among the total energy consumption load of the residential user group, the proportions of the final electricity load, heat load, and natural gas load are 0.229, 0.382, and 0.389 respectively. In the final evolution result of residential user energy load, heat and natural gas load account for a relatively higher proportion. The main reason is residential users are more sensitive to price and energy cost, which has the highest weight of energy consumption cost (0.369). Compared with the electricity load, the unit price of natural gas and heat after conversion is 0.23 yuan and 0.19 yuan less respectively. Therefore, residential users are more inclined toward increasing the proportion of natural gas and heat load as much as possible under the premise of ensuring the reliability and comfort of users’ energy supply.
In the total energy consumption load of the large industrial user group, the proportion of final electricity load, heat load, and natural gas load are 0.309, 0.231, and 0.460 respectively. The main reason is similar to residential users. Large industrial users engaged in production are also very sensitive to the price of energy consumption. Therefore, they tend to choose primary energy for energy supply, which leads to natural gas accounting for a relatively high proportion of their comprehensive energy consumption. However, compared with residential users, large industrial users have higher requirements for energy supply reliability, and their weight of energy supply reliability is 0.109 higher than that of residential users. The electricity supply reliability of electric load is 0.015 higher than that of heat load. Moreover, according to the actual production limitation, the heat load absorption capacity of large industrial users is very low. As a result, although from the point of view of cost, electricity cost is 2,539.4 yuan higher than the heating cost, in the final energy consumption result the electric load accounts for a higher proportion.
In the total energy consumption load of the commercial user group, the proportion of final electricity load, heat load, and natural gas load are 0.510, 0.278, and 0.212 respectively. The main reason is that commercial users care more about user comfort and energy supply reliability, which is different from residential users and large industrial users. The weights of these two indicators i.e. user comfort and energy supply reliability are 0.260 and 0.466 respectively, which are the highest among the three types of users. Overall, the user comfort and energy supply reliability of electric load is the best. Moreover, for industry reasons, commercial users have a high cost of retrofitting electricity to other forms of energy and a limited capacity to absorb heat and natural gas loads (Yang et al., 2013). Therefore, in the energy consumption results of commercial users, their electrical load accounts for the highest proportion.
4.3 Comparison and analysis
In order to verify the correctness and effectiveness of the proposed method, the static clustering analysis method and the proposed method were used for the simulation, and the calculation results were compared. The two methods are as follows:
1) Static cluster analysis. The clustering decision is made directly according to the energy consumption characteristics of the three types of users without considering the dynamic change of load proportion of different types in the decision-making process.
2) The proposed method. According to the energy attributes of three types of users, the dynamic changes of different load proportions in the decision-making process are described by using evolutionary game theory.
The user utility results of the two methods are shown in Table 2.
TABLE 2
| Utility | Static cluster analysis method | Utility | Proposed method | ||||
|---|---|---|---|---|---|---|---|
| User type | Electricity supply | Heat supply | Natural gas supply | User type | Electricity supply | Heat supply | Natural gas supply |
| Resident | 0.548 | 0.546 | 0.487 | Resident | 0.645 | 0.587 | 0.512 |
| Large industry | 1.501 | 1.152 | 1.127 | Large industry | 1.576 | 1.163 | 1.178 |
| Commerce | 1.982 | 0.718 | 0.502 | Commerce | 2.029 | 0.789 | 0.537 |
Users’ utility results of two methods.
According to Table 2, in comparison with the static clustering analysis method, the user utility value calculated by the proposed method in this article is higher. Specifically, for residential users, the utility of electricity supply, heat supply, and natural gas supply calculated by the proposed method is 9.7, 4.1, and 2.5% higher, respectively. For large industrial users, the utility of electricity supply, heat supply, and natural gas supply calculated by the proposed method is 7.5, 1.1, and 5.1% higher, respectively. For commercial users, the utility of electricity supply, heat supply, and natural gas supply calculated by the proposed method is 4.7, 7.1, and 3.5% higher, respectively.
The analysis shows that the proposed method in this study is better in assisting users to make decisions on energy selection. The reason is that the perspective of the static clustering analysis method is to evaluate the energy consumption selection of user utility statically. However, the dynamic game between users and energy types in the process of choosing their own comprehensive energy consumption ratio is not considered, which makes it difficult for users and energy suppliers to optimize their own utility through interaction in the process of energy consumption selection and decision making. Contrary to the static clustering analysis method, the proposed method of this study aims to build an evolutionary game model of user energy choice decisions. The main objective of this model is to ensure that users and energy suppliers can dynamically adjust their decisions according to the situation of the evolutionary game so as to achieve utility maximization and increase the effectiveness and accuracy of decision results.
5 Conclusion
In this study, the idea of a dynamic game is applied to the decision-making process of users’ comprehensive energy consumption. Moreover, an analysis method of user comprehensive energy consumption behavior based on an evolutionary game is proposed. According to the simulation examples, the conclusions are as follows:
1) The user group’s choice of different energy types is unrelated to the initial state of energy supply occupancy and is only related to the energy consumption selection bias and the utility index of different types of energy.
2) When the evolutionary equilibrium is reached, if the specificity of user behavior is higher, the proportion of users choosing this kind of energy would be greater. Therefore, in the process of comprehensive energy market competition, the cultivation of user specificity is conducive to improving the market share of energy suppliers.
3) The proposed method in this study can ensure that users and energy suppliers adjust their decisions dynamically according to the situation of the evolutionary game, which assists them to realize the optimization of utility. As a result, the effectiveness and accuracy of decision results are higher.
Statements
Data availability statement
The raw data supporting the conclusion of this article will be made available by the authors, without undue reservation.
Author contributions
XFZ: methodology, software, investigation, formal analysis, and writing—original draft; JY: data curation, writing—original draft, and funding acquisition; QX: investigation; LuD: investigation; CY: resources; HW: resources; QH: supervision; LiD: validation; RS: writing—review and editing; XXZ: writing—review and editing.
Conflict of interest
XFZ, JY, QX, LuD, CY, HW, QH, LiD, RS, and XXZ were employed by the State Grid Yichang Power Supply Company.
The authors declare that the research was conducted in the absence of any commercial or financial relationships that could be construed as a potential conflict of interest.
Publisher’s note
All claims expressed in this article are solely those of the authors and do not necessarily represent those of their affiliated organizations, or those of the publisher, the editors, and the reviewers. Any product that may be evaluated in this article, or claim that may be made by its manufacturer, is not guaranteed or endorsed by the publisher.
References
1
AiQ.HaoR. (2018). Key technologies and challenges for multi-energy complementarity and optimization of inte grated energy system[J]. Automation Electr. Power Syst.42 (4), 2–10. (in Chinese). 10.7500/AEPS20170927008CrossRef Full Text | Google Scholar
2
BoutabaR.SalahuddinM. A.LimamN.AyoubiS.ShahriarN.Estrada-SolanoF.et al (2018). A comprehensive survey on machine learning for networking: Evolution, applications and research opportunities. J. Internet Serv. Appl.9 (1), 1–99. 10.1186/s13174-018-0087-2CrossRef Full Text | Google Scholar
3
ChenB.SunH.ChenY.GuoQ.WuW.QiaoZ. (2020). Energy circuit theory of integrated energy system Analysis (I): Gaseous circuit[J]. Proc. CSEE40 (02), 436–444. (in Chinese). 10.13334/j.0258-8013.pcsee.200028CrossRef Full Text | Google Scholar
4
ChengL.YuT. (2018). Typical scenario analysis of equilibrium stability of multi-group asymmetric evolutionary games in the open and ever-growing electricity market[J]. Proc. CSEE38 (19), 5687–5703. (in Chinese). 10.13334/j.0258-8013.pcsee.172219CrossRef Full Text | Google Scholar
5
CuiQ.BaiX.DongW.HuangB. (2019). Joint optimization of planning and operation in user-side multi-energy systems. Proc. CSEE39 (17), 4967–4981. (in Chinese). 10.13334/j.0258-8013.pcsee.181874CrossRef Full Text | Google Scholar
6
De GreveZ.LecronF.ValleeF.MorG.PerezD.DanovS.et al (2017). Comparing time-series clustering approaches for individual electrical load patterns. CIRED - Open Access Proc. J.2017 (1), 2165–2168. 10.1049/oap-cired.2017.1222CrossRef Full Text | Google Scholar
7
FengX. (2011). Research on power user classification Technology based on actual load curve [D]. North China: Electric Power University. Google Scholar
8
GuanH.PuL. (2010). A drivers' choice behavior model based on evolutionary game theory[J]. J. Beijing Univ. Technol.36 (08), 1077–1083. (in Chinese). 10.11936/bjutxb2010081077CrossRef Full Text | Google Scholar
9
GuoH.ChengH.MaZ.GeL. (2017). Comprehensive evaluation of power quality based on probability theory and combination weighting method[J]. Smart Grid5 (06), 524–528. (in Chinese). 10.14171/j.2095-5944.sg.2017.06.002CrossRef Full Text | Google Scholar
10
HuangW.ZhangN.KangC.LiM.HuoM. (2019). From demand response to integrated demand response: Review and prospect of research and application. Prot. Control Mod. Power Syst.4 (1), 1–13. 10.1186/s41601-019-0126-4CrossRef Full Text | Google Scholar
11
JalaliM. M.KazemiA. (2015). Demand side management in a smart grid with multiple electricity suppliers. Energy81 (1), 766–776. 10.1016/j.energy.2015.01.027CrossRef Full Text | Google Scholar
12
JorgenW. (2015). Weibull. Evolutionary game theory [M]. Shanghai: Shanghai People's Publishing House, 26–32. Google Scholar
13
LiuN.WangJ.WangL. (2019). Hybrid energy sharing for multiple microgrids in an integrated heat–electricity energy system. IEEE Trans. Sustain. Energy10 (3), 1139–1151. 10.1109/tste.2018.2861986CrossRef Full Text | Google Scholar
14
SamadiP.Mohsenian-RadH.SchoberR.WongV. W. S. (2012). Advanced demand side management for the future smart grid using mechanism design. IEEE Trans. Smart Grid3 (3), 1170–1180. 10.1109/tsg.2012.2203341CrossRef Full Text | Google Scholar
15
XiaoH. (2010). Research on several game problems in traffic planning [D]. China: Wuhan University. Google Scholar
16
YangN.DongZ.WuL.ZhangL.ShenX.ChenD.et al (2022b). A comprehensive review of security-constrained unit commitment. J. Mod. Power Syst. Clean Energy10 (3), 562–576. 10.35833/MPCE.2021.000255CrossRef Full Text | Google Scholar
17
YangN.QinT.WuL.HuangY.HuangY.XingC.et al (2021b). A multi-agent game based joint planning approach for electricity-gas integrated energy systems considering wind power uncertainty. Electr. Power Syst. Res.204, 107673. ISSN 0378-7796. 10.1016/j.epsr.2021.107673CrossRef Full Text | Google Scholar
18
YangN.YangC.WuL.ShenX.JiaJ.LiZ.et al (2022a). Intelligent data-driven decision-making method for dynamic multi-sequence: An E-Seq2Seq based SCUC expert system. IEEE Trans. Ind. Inf.18, 3126–3137. 10.1109/TII.2021.3107406CrossRef Full Text | Google Scholar
19
YangN.YangC.XingC.YeD.JiaJ.ChenD.et al (2021a). Deep learning-based SCUC decision-making: An intelligent data-driven approach with self-learning capabilities. IET Generation Trans. Dist.16, 629–640. 10.1049/gtd2.12315CrossRef Full Text | Google Scholar
20
YangP.TangG.NehoraiA. (2013). A game-theoretic approach for optimal time-of-use electricity pricing. IEEE Trans. Power Syst.28 (2), 884–892. 10.1109/tpwrs.2012.2207134CrossRef Full Text | Google Scholar
21
YangZ.WangL. (2016). Demand response management for multiple utility companies and multi-type users in smart grid[C]//Chinese Control Conference. China: IEEE, 10051–10055. Google Scholar
22
YuX.XuX.ChenS.WuJ.JiaH. (2016). A brief review to integrated energy system and energy internet [J]. Trans. China Electrotech. Soc.31 (01), 1–13. (in Chinese). 10.19595/j.cnki.1000-6753.tces.2016.01.002CrossRef Full Text | Google Scholar
23
ZengM.LiuY.ZhouP.WangY.HouM. (2018). Review and prospects of integrated energy system modeling and benefit evaluation[J]. Power Syst. Technol.42 (6), 1697–1708. (in Chinese). 10.13335/j.1000-3673.pst.2018.0150CrossRef Full Text | Google Scholar
Summary
Keywords
integrated energy market, evolutionary game, user’s comprehensive energy consumption behavior, subjective and objective combination weighting method, user utility model, evolutionary equilibrium
Citation
Zhu XF, Yao JW, Xie QY, Dai L, Yang CY, Wang HL, He Q, Deng L, Shen R and Zhou XX (2022) Research on the user comprehensive energy consumption decision-making method based on the evolutionary game. Front. Energy Res. 10:954250. doi: 10.3389/fenrg.2022.954250
Received
27 May 2022
Accepted
01 July 2022
Published
23 August 2022
Volume
10 - 2022
Edited by
Tinghui Ouyang, National Institute of Advanced Industrial Science and Technology (AIST), Japan
Reviewed by
Gaurav Sachdeva, DAV University, India
Sandeep Kumar Duran, Lovely Professional University, India
Updates
Copyright
© 2022 Zhu, Yao, Xie, Dai, Yang, Wang, He, Deng, Shen and Zhou.
This is an open-access article distributed under the terms of the Creative Commons Attribution License (CC BY). The use, distribution or reproduction in other forums is permitted, provided the original author(s) and the copyright owner(s) are credited and that the original publication in this journal is cited, in accordance with accepted academic practice. No use, distribution or reproduction is permitted which does not comply with these terms.
*Correspondence: Jun Wei Yao, yao-721210@163.com
This article was submitted to Smart Grids, a section of the journal Frontiers in Energy Research
Disclaimer
All claims expressed in this article are solely those of the authors and do not necessarily represent those of their affiliated organizations, or those of the publisher, the editors and the reviewers. Any product that may be evaluated in this article or claim that may be made by its manufacturer is not guaranteed or endorsed by the publisher.