1 Distributed Energy Resources, Transmission Power System Control, Energy Transition: An Exploratory Bibliometric Analysis Hussein Suprême, Senior Member, IEEE, Nivine Abou Daher, Member, IEEE, Martin de Montigny, Annissa Heniche Oussédik Abstract Energy transition is promoted by the international and scientific community to reduce society's carbon footprint and fight against climate change. In this context, power systems are increasingly equipped with distributed energy resources (DER) and variable energy resources (VER). Because of the variability introduced by these resources and power electronics converters, serving as the interface between them and AC power system, power systems operators are facing more challenges to maintain network reliability. Even if most of DERs are connected to distribution system, their integration will also impact the transmission system behavior. Furthermore, the utilities must ensure a better coordination and communications of the actions taken by the transmission system operator (TSO) and distribution system operator (DSO). In the context of end-to-end electricity system transition, development, and integration, the main objective of this transversal study is to analyze the content of published work. The aim is to target the new challenges to solve in order to maintain the reliability of the transmission and distribution power systems. The analysis is based on a bibliometric study of the Scopus database for published documents from 2011 to 2020. By using of statistical methods, a quantitative analysis is done on the one hand to highlight the evolution of science in this specific research area and on the other hand to identify current and future trends and challenges. Index Terms—Distributed energy resources, Power system control, Energy transition, Variable renewable energy, Transmission power system, Defense plans, Wide area control system. I. INTRODUCTION1 E NERGY plays a unique and crucial role worldwide. Without this, no activity can occur. The use of energy in society is a process that begins with a primary source involving several intermediate processes of refining or converting it to a different form of energy. It is ultimately found in consuming devices that are part of our daily lives (house, smart electronic devices), transportation, power systems, and so on. These transformations are major sources of carbon emissions. Therefore, energy consumption plays an important role in the transition to a low-carbon society. Energy transition designates a significant change in an energy system that could be related to one or a combination of green renewable resource use, system structure, scale, economics, end-use behavior, and energy policy [1]. As 1 This work was supported in part by Centre de recherche d’HydroQuébec (CRHQ). H. Suprême, N. Abou Daher, M. de Montigny, and A. Heniche Oussédik are with the Centre de recherche d’Hydro-Québec, Varennes, Québec, J3X 1S1, Canada (e-mail: supreme.hussein2@hydroquebec.com, aboudaher.nivine@hydroquebec.com, demontigny.martin@hydroquebec.com, heniche-oussedik.annissa@hydroquebec.com). investors prioritize environmental, social, and governance factors, the importance of energy transition continues to increase. Several signatory countries of COP26 have set the goal of a carbon-neutral economy by launching net-zero greenhouse gas emission targets for 2050 [2] [3] [4] [5] [6]. Furthermore, they are committed to adopting national and regional regulations in favor of the decarbonization of the economy, decentralization of electricity production, digitalization of the energy industry, the deregulation of the energy market, and democratization to strengthen the participation of skeptical consumers and prevent protests [7] [8] [9]. The increasing penetration of renewable energy into power systems, onset of electrification and improvements in energy storage are all key drivers of energy transition [10] [11]. In this new energy context, utilities and power grid operators face significant challenges in planning system operations [12], power system control and automation [13], and effectively communicating transmission and distribution systems [14] [15] [16]. Two main power system development models will emerge [17] [18]: a) large bulk transmission systems capable of interconnecting load regions and large centralized variable renewable energy (VRE) sources [19] [20], as well as to provide more interconnections between several countries and different energy markets [21] [22] [23]; and b) microgrids with clusters of small, largely self-contained distributed energy resources (DER), including decentralized generation, storage, electrical vehicles [24], and active customer participation operated in an intelligent way [25] [26]. Bibliometric review involves the use of statistical methods to quantitatively analyze publication data produced by individuals or institutions, such as peer-reviewed journal articles, books, conference proceedings, periodicals, reviews, reports, and related documents. Thus, the results permit the visualization of the evolution of science in a specific research area and the identification of current and future trends. Bibliometric reviews are popular in the fields of research related to management [27], economics [28], fuzzy research [29] [30], innovation [31], and pricing research [32]. In the power systems literature, several papers have addressed the concepts of energy transition and the high penetration of DER and VRE in power transmission and distribution systems. Few studies have analyzed the state-of-the-art of each of these concepts separately from a bibliometric perspective [33] [34] [35]. To the best of our knowledge, no bibliometric analysis has been conducted in the literature that crosses these concepts and mainly focuses on the behavior of power grids. The aim of this paper is to provide a general overview of research performed on energy transition, DER, VRE, and the control of these technologies over the last decade using bibliometric methods. We used Scopus as the database for collecting information. The main contributions of this paper are as follows: 1) Sorting out the issues of energy transition, high penetration of DER and VRE, and showing the main research issues and research trends at this stage. 2) Summarizing the research progress in the fields, which can help related researchers to further understand the domain. 3) Such a comprehensive review provides valuable research prospects for subsequent research. 4) Sorting the challenges for voltage control, frequency control, local and wide-area control systems, special protection schemes and defense plans in the face of DER and VRE integration. The paper proceeds as follows. Section II describes the methodology in terms of data collection and analytical methods. Section III presents the leading journals in the corpus. Section IV presents the most productive and influential authors and Section V presents the most cited articles. Section VI discusses publication dynamics by mapping academic collaboration and geographic trends. 84 million scientific journals, patents, books, and conference papers from over 7000 publishers and 17.6 million authors. SciVal was used for more advanced bibliometric analysis. This decision-making support tool is based on statistical and mathematical analysis of scientific publication performances of over 20000 research institutions and their associated researchers from 230 nations worldwide. With access to more than 300 trillion metric values, SciVal quickly provides context for analysis and generates powerful data visualizations. The data can be analyzed at the national, institutional, individual, or customized research team level. VOSviewer is a software for constructing and viewing bibliometric maps. For instance, these maps include journals, researchers, or individual publications, and can be constructed based on citation, bibliographic coupling, cocitation, or co-authorship relations [36]. VOSViewer generates networks of co-occurrence of important terms extracted from a corpus of scientific literature. It was used to identify the major trends associated with the subjects under study and to capture some weak signals related to the areas identified in the corpus of selected publications. B. Search Strategy Bibliometric analysis was based on the data retrieved from the Scopus database. All documents were published from 2011 to 2020 with the expressions “distributed energy resources”, “energy transition”, and “control” in their titles, abstracts, or keywords retrieved. The research strategy was based on these three index terms by launching the query of the following equation: TITLE-ABS-KEY(|distributed energy resources|) AND TITLE-ABS-KEY(|energy transition |) AND TITLE-ABS-KEY(|control |) AND PUBYEAR > 2010 AND PUBYEAR < 2021 (1) II. DATA AND METHODOLOGY A. Tools Overview In this article, bibliometric analysis was carried out using three main tools: Scopus for data collection, SciVal and VOSviewer for analysis and visualization. Indeed, the data were collected from Scopus (Elsevier), which allows articles to be found by search terms and exported along with their metadata, such as their references, abstracts, and journal information. Their developers claimed to index over Fig. 1. Subject areas grouping – Accessed May 14, 2022 Inappropriate domains with few affinities to study subjects were excluded. The retained domains are shown in Fig. 1. A total of 6626 documents were retrieved. Those included 3491 conference papers, 2468 articles, 199 book chapters, 175 reviews, 54 conference reviews, 21 books, and ten editorials. The others were classified as short 3 surveys, letters, or undefined documents. Regarding language, 97% of the documents were written in English, 2% in Chinese, and 1% in other languages (Korean, Polish, Spanish, Japanese, etc.). Slightly more than a quarter of the documents (26.7%) were open access. All documents were uploaded to SciVal to create a new research area that facilitates the analysis. This conversion generated a corpus of more than 5150 documents in total for the period from 2011 to 2020; some links could not be referenced by Scival. Therefore, the bibliometric analysis carried out in this article was based on the proposed bibliographic references. The number of publications in these research areas is growing rapidly as shown in Fig. 2. Before 2015, the number of publications per year was less than 400. From 2016, an acceleration was observed until reaching 1003 publications in 2020. These index terms are becoming increasingly popular among scientists requiring innovative solutions. Fig. 2. Evolution of the number of publications per year C. Topic clusters and Topics SciVal clustered Scopus publications from 1996-present to present topics and topic clusters using a direct citation analysis. A topic is a dynamic collection of documents with commonly focused intellectual interest. Topic clusters are formed by aggregating topics with similar research interests to form a broader, higher-level research area. Each publication belonged to only one topic and one topic cluster. Prominence is used as an indicator to evaluate the momentum/movement or visibility of a particular topic. However, this is not a quality indicator. The calculation of a topic’s prominence combines three metrics to indicate the momentum of the topic: 1. Citation count in year to papers published in and . 2. Scopus views count in year n to papers published in n and . 3. Average CiteScore for year . Between 2011 and 2020, the corpus contributed 579 topics and 141 topic clusters. top 1% of worldwide topic clusters by prominence are shown in Table I. More than half of the documents in the database (2686/5150) were found in topic cluster TC1: Electric Power Transmission Networks; Wind Power; Electric Power Distribution. TC1 and TC2 are consistent, knowing that current market designs and operational practices do not provide a level playing field for DERs to deliver services [37]. Existing markets need to evolve [38] [21] [39], new markets need to be created [40] [41], and new roles and coordination functions need to be established between distribution system operators (DSO) and transmission system operators (TSO) [42] [43]. Most published works have focused on deterministic microgrid operations and energy management at the distribution level [44] [45]. More work needs to be done to assess the impacts of DERs penetration on the transmission system, defense plan, and application of stochastic methods in the operation of microgrids [12]. TABLE I TOP 1% OF WORLDWIDE TOPIC CLUSTERS BY PROMINENCE – ACCESSED MAY 14, 2022 Worldwide Scholarly Id Topic Cluster Prominence Output percentile TC1 Electric Power Transmission 2686 99.331 Networks; Wind Power; Electric Power Distribution TC2 Electricity; Energy; 43 99.264 Economics TC3 Secondary Batteries; Electric 9 99.933 Batteries; Lithium Alloys TC4 Algorithms; Computer 1 99.799 Vision; Models Because the number of documents is much higher in TC1, a query was launched to determine the top 50 keyphrases by relevance. As shown in Fig. 3, Electric Utilities is declining as a keyphrase. Power grids are being increasingly treated as part of Energy Systems [46]. The keyphrases in growing show that the energy transition reckons on intelligent management of the power system (Smart Grid, Microgrid) [47] [48] [49], development of new approaches and strategies for macroeconomic and energy markets (Power Market, Smart Meters) [50] [51] [52], and innovation in resource management (Demand Response, Vehicle-to-grid) [53] [54] [55] [56]. As a VRE source, wind power is a hot topic (Wind Turbine, Wind Farm, Wind Speed) [57]. Owing to the stochastic nature of wind, wind power forecasting tools must enable better dispatch, Scheduling and Unit Commitment of thermal generators, hydro plants and energy storage plants and more competitive market trading as wind power ramps up and down on the grid [58] [59] [60]. Storage Systems (Energy Storage) are growing to compensate for the intermittency of renewable energies [61] [62] [63]. They can be applied for energy arbitrage, peak shaving, load following, spinning reserve, voltage support, frequency regulation, power quality, power reliability, transmission and distribution upgrade deferral, congestion relief, and off-grid services [64]. Moreover, the use of Electric Vehicles is vogue because of the incentives and policies adopted by several developed countries in the fight against climate change. Charging electric vehicles (EVs) poses an additional challenge [65] [66]. These new technologies lead to bidirectionality in the Electrical Load Flow; hence, there is interest in the calculations of the Power Flow and the Optimal Power Flow [67] [68] [69]. DSO and TSO are increasingly integrating them into their planning and operating systems. Load Forecasting [70] and power system control techniques (Frequency Control, Reactive Power and Voltage Control, Scheduling, Unit Commitment) [71] [72] [73] are expected to evolve to consider not only the intermittency of resource availability, but also the changing distribution of resources across the system. Id T8 T9 T10 T11 T12 T13 T14 Fig. 3. Top 50 keyphrases by relevance in TC1 – Accessed May 14, 2022 Table II groups the Top 1% of worldwide topics by prominence having a citation in at least 19 publications. Almost half of the documents (2467/5150) are found in the Topics identified. The trend is similar to the Topic Cluster. Moreover, there is a sustained presence of technologies related to solar energy (Inverters, DC-DC Converter) [74]. The worlwide prominence percentile confirm that funding will increase in non-wire alternatives (Power Sharing, Demand Response, Demand Side Management) [75] [76] [77], and power system control to face the high penetration of DER and VRE [78] [79]. TABLE II TOP 1% OF WORLDWIDE TOPICS BY PROMINENCE – ACCESSED MAY 14, 2022 Worldwide Scholarly Id Topics Prominence Output percentile T1 Grid; Power Sharing; 828 99.876 Inverters T2 Solar Energy 476 99.679 Conversion; Active Distribution Network; Voltage Control T3 Demand Response; 464 99.936 Demand Side Management; Energy Conservation T4 Electric Vehicle; 163 99.897 Vehicle-To-Grid; Charging T5 Microgrid; DC-DC 153 99.547 Converter; Electric Potential T6 Energy; Gas Network; 85 99.744 Economic Dispatch T7 Advanced Metering 83 99.309 Infrastructures; Internet Topics Of Things; Privacy Preserving Grid; Microgrid; Energy Systems Combined Heat and Power; Cogeneration Plants; Cooling Unit Commitment; Wind Power; Reserve Requirements Inverters; Electric Current Control; Connected Electric Power Plant Loads; Electricity Price; Power Markets High Voltage Direct Current System; Offshore Wind Farms; Converter Wind Power; Electricity Storage; Arbitrage Scholarly Output Worldwide Prominence percentile 53 99.866 43 99.493 30 99.148 30 99.191 21 99.728 19 99.209 19 99.879 A query was launched in T1 to determine the top 50 keyphrases by relevance. The results presented in Fig. 4 show that Microgrid is the most popular topic. Operation and power system control have been extensively discussed [80]. Indeed, control challenges exist for power system stabilization, control [81], and protection [82] with many inverter-based resources [82] [83]. Conventionally for bulk power system (BPS) analysis and simulation, DERs are mostly modeled as aggregated net constant power loads at distribution substation nodes [84]. With the increasing penetration of grids following DERs and their inherently different fault-handling behaviors [85] [86], expanding the adoption of grid-forming or grid-supporting control technologies [87] [88], grid dynamics are gradually evolving. A simplified representation of DERs as a negative load does not reflect the grid-DER interaction. It is necessary to model the detailed DER dynamics and transient behaviors for BPS planning, control, and operation [89]. Furthermore, existing power system protection systems are mainly designed for machine-based generators and distribution systems for unidirectional power flow. A bidirectional power flow could occur. In addition, the shortcircuit current contribution of inverter-based DERs is typically lower than that of synchronous generators, which requires new protective relay sensors to detect lower current values and more advanced protection coordination schemes [90]. Besides, online optimization of frequency control, voltage control, and wide-area control systems is required in transmission networks to avoid instability owing to the volatility of DER [79] [91]. Optimal power flow (OPF) is the primary tool used for optimization at minimum cost [91] [92]. The reverse power flow of the DER can increase the boundary bus voltage and cause uncoupled voltages in transmission and distribution systems, which requires coordination between the DSO and TSO [91]. This coordination is also important to avoid long-term voltage 5 instability and limit the reactive power exchange caused by voltage control in distribution networks that ignore the conditions of the transmission network [91]. In addition, DER can improve system stability and provide flexible localized VAR support to the bulk system [91] [93]. 16 17 18 19 20 Scopus Source SO VC FWCI CC IEEE Transactions on Industrial Electronics International Transactions on Electrical Energy Systems Dianli Xitong Zidonghua/Automation of Electric Power Systems IECON Proceedings (Industrial Electronics Conference) Energy Procedia 37 2 824 7.24 6°252 37 1 292 1.37 456 35 1 143 1.6 929 35 501 1.96 245 31 664 1.57 447 SO: Scholarly Output; VC: Views Count; FWIC: Field-Weighted Citation Impact; CC: Citation Count Fig. 4. Top 50 keyphrases by relevance in T1 – Accessed May 14, 2022 By ranking the number of publications by year, as shown in Fig. 5, we observed a stronger growth of peer-reviewed documents in open-access journals. In 2019 and 2020, these journals were the most prolific in terms of the number of publications, going so far as exceeding the peaks of other publishers. III. LEADING JOURNALS AND SCOPUS SOURCES To provide a general overview of the most influential publishers, in Table III, we present 20 Scopus sources by scholarly output up to April 30, 2022. Nearly half of the publications came from IEEE-affiliated transactions and societies. We also noticed that the greatest number of publications is associated with a particular event with a peak in 2018, the IEEE Power and Energy Society General Meeting. TABLE III TOP 20 SCOPUS SOURCES IN THE PUBLICATION SET, BY SCHOLARLY OUTPUT 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 Scopus Source SO VC FWCI CC IEEE Power and Energy Society General Meeting Energies IEEE Transactions on Smart Grid IEEE Transactions on Power Systems Applied Energy 228 3 633 2.58 2 204 217 207 6 369 8708 1.05 5.81 2°686 13°710 119 4 360 3.73 7°187 113 9 201 4.24 6°263 International Journal of Electrical Power and Energy Systems IEEE Access 109 6 991 2.06 3°011 100 2 133 1.78 1°686 IET Generation, Transmission and Distribution IET Conference Publications Electric Power Systems Research Energy 97 2 730 1.57 2°173 85 828 0.41 142 80 3 888 1.99 2 547 57 3 891 3.43 2°763 IEEE Transactions on Sustainable Energy Renewable and Sustainable Energy Reviews IEEE Transactions on Industrial Informatics IEEE Transactions on Industry Applications 49 2 090 1.8 3°011 48 6 305 1.29 5°133 47 3 169 4.68 4°401 46 1 009 2.74 1°286 Fig. 5. Top 7 Scopus sources in the publication set, by scholarly output Although the high number of publications can not strictly reflect the reputation of a journal. The number of views and citations indicates the quality perceived by the scientific community. IEEE Transactions on Smart Grid had the highest number of cited papers, whereas Applied Energy had the highest number of consulted articles. Furthermore, the field-weighted citation impact (FWCI) indicates how the number of citations received by an entity’s publications compares to the average number of citations received by all other similar publications in the data universe. An FWCI of 1.00 indicates that the entity’s publications have been cited exactly, as would be expected based on the global average for similar publications. An FWCI of more (less) than 1.00 indicates above (below) the global average for similar publications. This metric can be biased by entities with a small number of publications. A few highly cited publications can skew the FWCI value, as observed in Table III for the IEEE Transactions on Industrial Electronics. By combining these four parameters, IEEE Transactions on Smart Grid appears to be the leading publisher in the field of this study. It should also be noted that for open-access journals, the coefficients are greater than 1. The scientific community values the work quality of these journals. Author SO VC FWCI CC 31 Strasser Thomas I. 18 507 2.48 364 32 Verbič Gregor 18 666 2.09 413 33 Hu Junjie 17 623 2.99 653 In Table IV, we present authors who have published at least 15 papers in the field of our study during the last decade, for a total of 60 authors. Altogether, they published 1 259 documents, which represent approximately a quarter of our corpus. They accumulated 44 497 views of their documents out of a total of 146 415 (approximately 30%), and 46 975 citations out of a total of 106 516 415 (approximately 44%). Guerrero Josep M. was the author with the most publications, views, and citations. The most relevant keyphrases in his work are Microgrid, Energy Resources, and Distributed. Most articles were published in IEEE-affiliated journals. 34 Iravani Reza M. 17 642 3.28 1009 35 Mohammed Osama A. 17 391 3.21 513 36 Rajagopal Ram S. 17 477 2.78 530 37 Wang Jianxiao 17 518 2.61 465 38 Wu Qiuwei 17 750 4.12 639 39 Yue Dong 17 381 1.81 385 40 Brandao D. I. 16 266 1.16 228 41 Chapman Archie C. 16 601 2.23 401 42 Dall’Anese Emiliano 16 217 2.95 350 43 Johnson Jay N. 16 326 2.21 180 44 Li Li 16 579 1.15 231 TABLE IV THE 60 MOST PRODUCTIVE AND INFLUENTIAL AUTHORS, RANKED BY 45 Rana Md Masud 16 436 1.45 231 46 Sousa Tiago M. 16 551 2.33 365 47 Vásquez Juan Carlos 16 1670 8 4163 48 Wang Chengshan 16 468 3.1 702 49 Wang Jianhui 16 956 6.3 865 50 Andrén Filip Pröstl 15 316 2.28 208 51 Blaabjerg Frede 15 1 176 5.94 2 744 52 Cheng Potai 15 416 3.45 800 53 Haghifam Mahmoudreza 15 709 1.98 530 54 Kang Chongqing 15 876 3.37 692 55 Reno Matthew J. 15 170 4.42 192 56 Repo Sami 15 355 2.51 356 57 15 217 1.65 110 58 Sakis Meliopoulos Athanasios P. von Meier, Alexandra 15 351 3.78 547 59 You Shi 15 533 2.31 398 60 Zhong Haiwang 15 489 2.96 468 IV. MOST PRODUCTIVE AND INFLUENTIAL AUTHORS SCHOLARLY OUTPUT Author SO VC FWCI CC 1 2 3 4 Guerrero Josep M. Illindala Mahesh S. Vale Zita Shahidehpour Mohammad 47 46 43 37 2 957 923 1 288 1 183 5.34 2.5 1.91 5.6 5519 689 737 2 036 5 Shahnia Farhad 34 819 2.09 520 6 Morais Hugo M. 32 1 016 2.08 572 7 B. Gharehpetian Gevork 31 1 032 3.19 1 345 8 Caldognetto Tommaso 31 712 2.01 523 9 Nguyen Phuong H. 30 669 1.6 315 10 Hatziargyriou Nikos 28 1 367 3.41 1 772 11 Mattavelli Paolo 28 693 2.55 397 12 Bindner Henrik William 26 746 1.81 461 13 26 541 4.45 1 197 14 Domínguez-Garćia Alejandro D. Tenti Paolo 26 752 2.3 456 15 Faria, Pedro 25 690 1.34 395 16 Ghosh Arindam 24 513 2.42 461 17 Hossain Md Jahangir 20 671 2.39 472 18 Joós Géza 20 562 2.35 478 19 Mancarella Pierluigi 20 1 063 3.86 589 20 Marnay Chris 20 1 879 3.84 1 105 21 Baghaee Hamid Reza 19 609 3.83 1 056 22 Catalão João P.S. 19 830 1.83 385 23 Khodaei Amin 19 668 5.32 1 577 24 Monti Antonello 19 445 2.02 359 25 Stadler Michael R. 19 1 591 2.58 801 26 Dou Chunxia 18 474 2.09 485 27 Dubey Anamika 18 259 2.81 272 28 Fotuhi Firuzabad Mahmud 18 700 2.2 694 29 Shafie-khah Miadreza 18 835 2.3 516 30 Siano Pierluigi 18 1 377 3.03 1 059 Authors with an h-index higher than 70 are listed in Table V. This indicator is defined as the maximum value of h such that a given author has published at least h papers, each of which has been cited at least h times. TABLE V TOP TEN OF AUTHORS WITH HIGHEST H-INDEX Authors hindex Authors hindex Blaabjerg Frede Guerrero Josep M. Shahidehpour Mohammad Yu Xinghuo 142 107 88 142 Dong Zhao Yang Liserre Marco Tolbert Leon M. Johansson Karl H. 76 73 72 71 Wang Jianhui 81 Singh Bhim 71 As shown in Fig. 6, taking the authors with the highest score as the main criterion, we see that the ranking differs significantly from that shown in Table IV. We show the number of publications by authors on the secondary axis of the ordinates. Most authors had fewer than 15 publications. 7 However, Shahidehpour Mohammad and Guerrero Josep M. stand out by being present in this ranking. By crossing the results of Table IV, Table V, and Fig. 6, we can assume that Guerrero Josep M. and Shahidehpour Mohammad are the most productive and influential authors in our corpus. Fig. 6. Authors with the highest Field-Weighted Citation Impact V. MOST CITED ARTICLES For each year, global publications were extracted from Scopus and ordered from the highest to lowest based on their FWCI values. The publications were then split into 100 even percentiles and the FWCI thresholds were noted. In our database, as shown in Fig. 7, 25% of the publications are among the top 10% most cited publications worldwide and 1% in the top 1%. In both cases, there was a clear decrease since 2011. This can be explained by the growing increase in work carried out over the last decade and the diversity of sources. Furthermore, 1 052 publications (39.9%) among the top 10% journals by CiteScore. DERs and the time variance, topological changes (unavailability and disconnection of DER units), and low inertia and stability issues due to the high integration of power electronic devices. TABLE VI TOP 5 OF MOST CITED PUBLICATIONS IN THE CORPUS Topic Cluster CC Hierarchical control of droop-controlled AC and DC microgrids – A general approach toward standardization. [81] Guerrero Josep M, Vasquez Juan C, Matas José, De Vicuña Luis García, Castilla Miguel IEEE Transactions on Industrial Electronics Control of power converters in AC microgrids. [78] Rocabert Joan, Luna Alvaro, Blaabjerg Frede, Rodriguez Pedro IEEE Transactions on Power Electronics Demand side management: Demand response, intelligent energy systems, and smart loads. [53] Palensky Peter, Dietrich Dietmar IEEE Transactions on Industrial Informatics Demand side management in smart grid using heuristic optimization. [75] Logenthiran Thillainathan, Srinivasan Dipti, Shun Tan Zong IEEE Transactions on Smart Grid Smart distribution: Coupled microgrids. [47] Lasseter Robert H Proceedings of the IEEE 3334 FW CI 72.8 2126 46.0 1984 37.6 873 36.3 831 76.8 VI. PUBLICATION DYNAMICS: MAPPING OF ACADEMIC COLLABORATIONS AND GEOGRAPHIC TRENDS Countries with more than 200 publications in the corpus are shown in Fig. 8. The United States (US) is the clear leader in terms of produced documents, views, and citation counts. In the top 10, works from China and the US combined account for almost half of the literature. These works have also accumulated the most citations and views. In terms of FWCI, Denmark ranks highest with a factor of 2.89, followed by the United Kingdom (UK) at 2.51, and the US at 2.46. We note that the two most influential authors in the previous section were from the US and Denmark. Fig. 7. Outputs in top citation percentiles The top five most-cited publications are presented in Table VI. All five were published in IEEE-affiliated journals. The first two proposed methods for controlling power converters, while the others deal with the intelligent management of the grid mitigation means. Demand response will indeed play a key role in the electricity balancing act in the future, allow customers to charge their real-time price of electricity, contribute to increasing the efficiency and use of system assets, and increase the return on investment by expanding the utilization of assets and making the electricity sector more attractive to investors. Network control has steadily become more complex. The most prevailing challenges and desired features in microgrid control include communication between all the Fig. 8. Top 20 countries/regions in the publication set, by scholarly output As described in Fig. 9, the ranking of research institutions according to the number of publications on our publication set shows a geography that is slightly different. If the American and Chinese research institutions dominate the top 10 publishers, the research institution that has been publishing the most is the Technical University of Denmark (it represented around 53 % of the Danish publications in the domain). This is followed by the National Renewable Energy Laboratory (NREL) of the US Department of Energy and North China Electric Power University. In the fourth position, Aalborg University is the second Danish institution among the top five, followed by Tsinghua University. Notice that the Iranian University Islamic Azad University is in 7th position and the University of Padua from Italia in 10th position. (TLS) with other countries. The TLS attribute refers to the total strength of the co-authorship links between researchers in each country and researchers from other countries. China, Denmark, and the UK complete the top four with 214, 148, and 136 TLS, respectively. The four largest coauthorship links are between these country pairs: US/China, US/Canada, Denmark/UK, and Denmark/China. Fig. 9. Top 10 institutions in the publication set VOSviewer was used to construct and visualize the bibliometric collaboration networks. In our documentary corpus, 96.3% of the publications were produced in a collaborative context. In this study, collaboration indicates the extent to which an entity’s publications have international, national, or institutional co-authorship and single authorship. As shown in Table VII, most papers were published only through institutional collaboration and achieved the highest number of citations. Only national collaborations produced more documents than international collaborations did; however, the number of citations was lower. International collaborations have a better FWCI in our dataset. Without collaboration, the authors were less productive for the three indicators examined. It can be deduced that the collaborations are generally paid by obtaining 97% of the citations, in addition to the very large number of publications. TABLE VII DISTRIBUTION AND IMPACT OF PUBLICATIONS IN A COLLABORATIVE CONTEXT International collaboration Only national collaboration Only institutional collaboration Single authorship (no collaboration) SO Citations FWCI 1 214 1 436 2 309 191 33 101 25 414 44 985 3436 2.29 1.81 1.95 1.56 The collaboration networks among different countries are shown in Fig. 10. The distance between the two countries in the visualization indicates the relatedness of the countries in terms of co-authorship links. The closer the two countries are to each other, the stronger their relatedness. The strongest co-authorship links between the countries are represented by lines. The US remains a central hub for collaboration in the field, with 353 total link strengths Fig. 10. Collaboration network among the different countries VII. CONCLUSION This article presents a bibliometric review of 6626 documents published in the literature from 2011 to 2020 by crossing the concepts of distributed energy resources, variable renewable energy, power system control, and energy transition. Bibliometric analysis is a quantitative study of the bibliographic materials. It provides a general picture of the research field, which can be classified by papers, authors, and journals. The number of publications per year is rapidly growing. The power grid is increasingly being treated as part of the energy system. The main sources of the documents are IEEE-affiliated transactions and societies journals. The Technical University of Denmark was the largest contributor. The US is a central hub for collaboration in the field. Voltage control, frequency control, special protection schemes, and defense plans are expected to evolve to consider not only the intermittency of resource availability but also the changing distribution of resources across the system. Eventually, this work can be used for future research directions in the areas of power system control and automation in the context of the high penetration of distributed energy resources and variable renewable energy. Researchers new to the field can also use this study to better target hot topics. 9 ACKNOWLEDGMENT This study was produced through a collaboration between two innovation strategies (COOPERE and CGAR) of the research center of Hydro-Québec. COOPERE helps to monitor emerging technologies related to DER in the management and behavior of transmission and distribution systems, to conduct follow-ups of university and industrial collaborations, and develop the skills of the team's researchers. 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Hussein Suprême (M’12–SM’19) received the bachelor’s degree (2007) in electromechanical engineering from Faculté des Sciences, Université d’État d’Haïti, Haïti; M. Sc. A. (2013) and Ph.D. (2017) degrees from École de technologie supérieure, Canada. He is currently a researcher at the Institut de Recherche d’HydroQuébec, specializing in the development of tools to assess the impact of distributed energy resources (DER) integration on the transmission system, dynamic performance, and control of power systems. He is also a project manager for the R&D innovation program in the optimization of future energy systems and planning of power system operations. He has been an Associate Professor in Electrical Engineering with Université Laval since 2022, and Institut des Sciences, des Technologies et des Études Avancées d’Haïti since 2019. He is a member of the Ordre des Ingénieurs du Québec (Professional Engineers Québec, Canada). Dr. Suprême is an international consultant for the development of variable renewable energy integration projects, rural electrification, power grid simulation, and system stability. He was a recipient in 2011 of the prestigious scholarship of "Programme canadien de bourses de la Francophonie". Nivine Abou Daher received the bachelor’s degree (2012) in electrical engineering from Lebanese University, Master’s 2 Diploma (2012) from Lebanese University and the University of Technology of Compiègne, and the Ph.D. degree (2015) from Lebanese University and St. Joseph University. She has been a research engineer with the Institut de Recherche d’Hydro-Quebec since 2019. Her research interests include power system control. Dr. Abou Daher is a member of the Ordre des Ingénieurs du Québec (Professional Engineers, Québec, Canada). Martin de Montigny received his B.Eng. (1997), M.Eng. (2000) and Ph. D. degrees (2006) in electrical engineering from Université du Québec à Trois-Rivières. Since 2007, he has worked as a researcher at the Hydro-Québec Research Institute (IREQ) in the Network Control and Management Department. He specializes in evaluating the transmission grid impacts of variable renewable and distributed energy resources. Dr. de Montigny is the project manager of the OSER initiative, which aims to design and implement new tools for the transmission planners. Annissa Heniche-Oussedik received the B.Eng. degree in electrical engineering from Ecole Nationale des Ingénieurs et Techniciens d’Algérie in 1985, and a master’s degree in control system, signal processing, and Ph.D. degree in power system robust control from Paris 11 University, Paris, France, 1992 and 1995, respectively. She joined the Hydro-Québec Research Institute, in 2001, where she is currently a Senior Researcher with the Power System Management and Control Department. Dr. Henniche Oussedik is also the project manager of the R&D innovation strategy in the field of control systems and automation. His primary activities include the development and implementation of power systems, innovative special protection schemes, and control systems. She was the Canadian representative of the Cigre C6 Study Committee and a member of the Québec Order of Engineers.
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