Walmir Freitas

5.9k total citations · 1 hit paper
142 papers, 4.5k citations indexed

About

Walmir Freitas is a scholar working on Electrical and Electronic Engineering, Control and Systems Engineering and Automotive Engineering. According to data from OpenAlex, Walmir Freitas has authored 142 papers receiving a total of 4.5k indexed citations (citations by other indexed papers that have themselves been cited), including 138 papers in Electrical and Electronic Engineering, 87 papers in Control and Systems Engineering and 13 papers in Automotive Engineering. Recurrent topics in Walmir Freitas's work include Microgrid Control and Optimization (43 papers), Islanding Detection in Power Systems (40 papers) and Power Systems Fault Detection (39 papers). Walmir Freitas is often cited by papers focused on Microgrid Control and Optimization (43 papers), Islanding Detection in Power Systems (40 papers) and Power Systems Fault Detection (39 papers). Walmir Freitas collaborates with scholars based in Brazil, Canada and United States. Walmir Freitas's co-authors include Wilsun Xu, José Carlos de Melo Vieira Júnior, Hans P. Merkle, Bruno Gander, A. Morelato, Fernanda C. L. Trindade, Diogo Salles, Carolina M. Affonso, Ricardo Torquato and Wei Xu and has published in prestigious journals such as Journal of Controlled Release, IEEE Transactions on Power Systems and IEEE Transactions on Smart Grid.

In The Last Decade

Walmir Freitas

134 papers receiving 4.3k citations

Hit Papers

Microencapsulation by solvent extraction/evaporation: rev... 2004 2026 2011 2018 2004 200 400 600
What are hit papers?

Hit papers significantly outperform the citation benchmark for their cohort. A paper qualifies if it has ≥500 total citations, achieves ≥1.5× the top-1% citation threshold for papers in the same subfield and year (this is the minimum needed to enter the top 1%, not the average within it), or reaches the top citation threshold in at least one of its specific research topics.

  1. Microencapsulation by solvent extraction/evaporation: reviewing the state of the art of microsphere preparation process technology
    2004 710 citations Walmir Freitas, Hans P. Merkle et al. Journal of Controlled Release profile →

Peers — A (Enhanced Table)

Peers by citation overlap · career bar shows stage (early→late) cites · hero ref

Name h Career Trend Papers Cites
Walmir Freitas Brazil 34 3.7k 2.6k 283 271 215 142 4.5k
Hazlee Azil Illias Malaysia 38 3.3k 0.9× 1.2k 0.5× 15 0.1× 38 0.1× 410 1.9× 208 4.2k
Ranjit Roy India 22 2.0k 0.5× 1.2k 0.4× 7 0.0× 47 0.2× 308 1.4× 91 3.4k
Asit Mohanty India 23 1.2k 0.3× 1.1k 0.4× 5 0.0× 63 0.2× 203 0.9× 155 2.2k
Xiaoqing Lu China 30 1.8k 0.5× 2.0k 0.8× 26 0.1× 9 0.0× 102 0.5× 122 3.5k
Xiaowei Fu China 24 627 0.2× 361 0.1× 113 0.4× 17 0.1× 176 0.8× 142 2.1k
Yonglu Liu China 23 1.6k 0.4× 672 0.3× 13 0.0× 19 0.1× 58 0.3× 134 2.0k
Ye Guo China 29 1.5k 0.4× 548 0.2× 8 0.0× 12 0.0× 580 2.7× 116 2.6k
Jidong Wang China 26 992 0.3× 361 0.1× 14 0.0× 11 0.0× 487 2.3× 78 1.8k
Xiaoguang Zhang China 27 2.9k 0.8× 1.7k 0.7× 8 0.0× 39 0.1× 64 0.3× 139 3.8k

Countries citing papers authored by Walmir Freitas

Since Specialization
Citations

This map shows the geographic impact of Walmir Freitas's research. It shows the number of citations coming from papers published by authors working in each country. You can also color the map by specialization and compare the number of citations received by Walmir Freitas with the expected number of citations based on a country's size and research output (numbers larger than one mean the country cites Walmir Freitas more than expected).

Fields of papers citing papers by Walmir Freitas

Since Specialization
Physical SciencesHealth SciencesLife SciencesSocial Sciences

This network shows the impact of papers produced by Walmir Freitas. Nodes represent research fields, and links connect fields that are likely to share authors. Colored nodes show fields that tend to cite the papers produced by Walmir Freitas. The network helps show where Walmir Freitas may publish in the future.

Co-authorship network of co-authors of Walmir Freitas

This figure shows the co-authorship network connecting the top 25 collaborators of Walmir Freitas. A scholar is included among the top collaborators of Walmir Freitas based on the total number of citations received by their joint publications. Widths of edges represent the number of papers authors have co-authored together. Node borders signify the number of papers an author published with Walmir Freitas. Walmir Freitas is excluded from the visualization to improve readability, since they are connected to all nodes in the network.

All Works

20 of 20 papers shown
1.
Trindade, Fernanda C. L., et al.. (2025). Composed aggregate modeling of DERs at feeder level for steady state analysis of distribution systems. Electric Power Systems Research. 245. 111608–111608. 1 indexed citations
2.
Silva, João S., et al.. (2025). O PAPEL DO ENFERMEIRO NA HUMANIZAÇÃO DO CUIDADO DE PACIENTES ONCOLÓGICOS PEDIÁTRICOS: UMA REVISÃO DA LITERATURA. Brazilian Journal of Implantology and Health Sciences. 7(3). 1063–1072.
3.
Bonatto, Benedito Donizeti, Tiago M. Barbosa, Walmir Freitas, et al.. (2025). Grid-edge renewable technologies enabling sustainable cities through big data analytics for energy sustainability. Energy Sustainable Development. 86. 101707–101707.
4.
Torquato, Ricardo, et al.. (2024). Flexible Impedance Calculation of Inverter-Based Resources via Descriptor State Space Models. IEEE Transactions on Power Delivery. 40(2). 764–775.
5.
Trindade, Fernanda C. L., et al.. (2024). A Mixed-Integer Nonlinear Model to Support the Operation of Distribution Systems With Hidden DERs. IEEE Transactions on Power Delivery. 40(1). 484–496. 3 indexed citations
6.
Torquato, Ricardo, et al.. (2023). Method for Assessing the Risk of Subsynchronous Oscillations in DFIG-Based Wind Parks. 1–1. 1 indexed citations
7.
Torquato, Ricardo, et al.. (2022). Modeling of Single-Phase Photovoltaic Generators for System-Wide Harmonic Power Flow Studies. IEEE Transactions on Energy Conversion. 38(2). 914–926. 4 indexed citations
8.
Torquato, Ricardo, et al.. (2020). A Graphical Method to Assess Component Overload Due to Harmonic Resonances in Wind Parks. IEEE Transactions on Power Delivery. 36(3). 1819–1828. 9 indexed citations
9.
Torquato, Ricardo, et al.. (2019). Pre-Installation Studies of a BESS in a Real LV Network with High PV Penetration. 1–6. 6 indexed citations
10.
11.
Trindade, Fernanda C. L., José Carlos de Melo Vieira Júnior, & Walmir Freitas. (2016). Potential solutions for minimizing voltage sags caused by DG anti-islanding protection. 1–1. 1 indexed citations
12.
Torquato, Ricardo, Fernanda C. L. Trindade, & Walmir Freitas. (2014). Analysis of the harmonic distortion impact of photovoltaic generation in Brazilian residential networks. 239–243. 20 indexed citations
13.
Dong, Ming, Paulo C. M. Meira, Wilsun Xu, & Walmir Freitas. (2012). An Event Window Based Load Monitoring Technique for Smart Meters. IEEE Transactions on Smart Grid. 3(2). 787–796. 119 indexed citations
14.
Júnior, José Carlos de Melo Vieira, Diogo Salles, & Walmir Freitas. (2011). Power imbalance application region method for distributed synchronous generator anti-islanding protection design and evaluation. Electric Power Systems Research. 81(10). 1952–1960. 26 indexed citations
15.
Affonso, Carolina M., et al.. (2010). Planned islanding for Brazilian system reliability. 1–6. 10 indexed citations
16.
Nassif, Alexandre B., Wilsun Xu, & Walmir Freitas. (2010). An investigation on the selection of filter topologies for passive filter applications. 1–1. 8 indexed citations
17.
Grilo, Ahda P., et al.. (2008). An Analytical Approach to Determine the Optimal Resistance for the Three-Series-Resistor Method for Induction Generator Connection. IEEE Transactions on Energy Conversion. 23(4). 1111–1113.
18.
Freitas, Walmir, et al.. (2007). Policy and economic issues of electrical power and energy systems. International Journal of Global Energy Issues. 27(3). 253–253.
19.
Affonso, Carolina M., et al.. (2006). Demand-Side Management to Improve Power System Security. 8 indexed citations
20.
Freitas, Walmir, Hans P. Merkle, & Bruno Gander. (2004). Microencapsulation by solvent extraction/evaporation: reviewing the state of the art of microsphere preparation process technology. Journal of Controlled Release. 102(2). 313–332. 710 indexed citations breakdown →

Rankless uses publication and citation data sourced from OpenAlex, an open and comprehensive bibliographic database. While OpenAlex provides broad and valuable coverage of the global research landscape, it—like all bibliographic datasets—has inherent limitations. These include incomplete records, variations in author disambiguation, differences in journal indexing, and delays in data updates. As a result, some metrics and network relationships displayed in Rankless may not fully capture the entirety of a scholar's output or impact.

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