Sukumar Brahma

Clemson University

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i-10 index

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Satish J. Ranade

New Mexico State University

Matthew J. Reno

Sandia National Laboratories

Trupal Patel

Sandia National Laboratories

Phani Gadde

Clemson University

Rajesh Kavasseri

North Dakota State University

Huiping Cao

New Mexico State University

Milan Biswal

New Mexico State University

A.A. Girgis

Clemson University

Malati Chaudhary

New Mexico State University

Hany F. Habib

Pharmaceutical Product Development (United States)

Cooperative Institutions

New Mexico State University

Sandia National Laboratories California

Sandia National Laboratories

Clemson University

Relay Therapeutics (United States)

Institute of Electrical and Electronics Engineers

Texas A&M University

Electric Power Research Institute

Georgia Institute of Technology

Pacific Northwest National Laboratory

Author Statistics

Papers

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Circuit breaker selection in a wind farm with Type-2 wind turbine generators

Malati Chaudhary Sukumar Brahma Satish J. Ranade

With fast increasing penetration of wind power plants around the world, it is important to document the short circuit response of wind turbine generators (WTGs) and wind farms, and analyze its effect on nearby switchgear. Using a fully validated time-domain model of Mountain wind farm in Wyoming, USA, this paper documents and analyzes the short circuit responses of a Type-2 WTG, and a wind farm consisting of Type-2 WTGs. Based on short circuit responses, recommendations and suggestions are made to select circuit breakers inside and outside the wind farm. A simplified yet accurate wind farm model is also proposed to help selection of circuit breakers at the point of interconnection of a Type-2 wind farm. Since Type-1 and Type-2 wind farms are functionally similar, the observations and recommendations made in this paper also extend to Type-1 wind farms.

Switchgear

10.1109/pesmg.2013.6672894

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Citations (3)

Protection of Renewable-dominated Microgrids: Challenges and Potential Solutions.

Mohamed Elkhatib Abraham Ellis Milan Biswal Sukumar Brahma Satish J. Ranade

In this report we address the challenge of designing efficient protection system for inverter- dominated microgrids. These microgrids are characterised with limited fault current capacity as a result of current-limiting protection functions of inverters. Typically, inverters limit their fault contribution in sub-cycle time frame to as low as 1.1 per unit. As a result, overcurrent protection could fail completely to detect faults in inverter-dominated microgrids. As part of this project a detailed literature survey of existing and proposed microgrid protection schemes were conducted. The survey concluded that there is a gap in the available microgrid protection methods. The only credible protection solution available in literature for low- fault inverter-dominated microgrids is the differential protection scheme which represents a robust transmission-grade protection solution but at a very high cost. Two non-overcurrent protection schemes were investigated as part of this project; impedance-based protection and transient-based protection. Impedance-based protection depends on monitoring impedance trajectories at feeder relays to detect faults. Two communication-based impedance-based protection schemes were developed. the first scheme utilizes directional elements and pilot signals to locate the fault. The second scheme depends on a Central Protection Unit that communicates with all feeder relays to locate the fault based on directional flags received from feeder relays. The later approach could potentially be adapted to protect networked microgrids and dynamic topology microgrids. Transient-based protection relies on analyzing high frequency transients to detect and locate faults. This approach is very promising but its implementation in the filed faces several challenges. For example, high frequency transients due to faults can be confused with transients due to other events such as capacitor switching. Additionally, while detecting faults by analyzing transients could be doable, locating faults based on analyzing transients is still an open question.

Microgrid

Overcurrent

Transient (computer programming)

Power-system protection

High impedance

10.2172/1431195

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Citations (6)

Aggregation of Solar and Type 4 Wind Farms for Short Circuit Studies

Trupal Patel Sukumar Brahma Matthew J. Reno

Over the last decade, the power grid has seen a significant increase in renewable energy sources such as wind farms and solar photovoltaic (PV) plants. These farms consist of dozens of inverters, pad-mounted transformers, and collector feeders that, if modeled in detail, introduce a significant compu-tational burden. This paper presents a physics-based argument for simplification of such modeling, and illustrates through electromagnetic transient program (EMTP) simulations that a simple aggregated model of a farm can be created for short circuit studies without losing accuracy in the results. It also shows how an equivalent inverter can be created based on the ratings and number of individual PV or type 4 wind turbine generator units. lowering the modeling and computational burden of simulating solar and type 4 wind farms in EMT simulations

Emtp

Transient (computer programming)

Grid parity

10.1109/isgt51731.2023.10066433

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Citations (4)

Power conservation over frequency transformation in Doubly Fed Asynchronous Generator

Sukumar Brahma Malati Chaudhary Satish J. Ranade

With a steep rise in wind farms around the world, Doubly Fed Asynchronous Generator (DFAG) has emerged as a popular machine. Also known as Type 3 wind turbine generator (WTG), this machine employs the well-known principle of injection and control of slip-frequency voltage into the rotor circuit to achieve performance over a large range of speed. Though extensive literature is available related to analysis of this machine, the balance of real and reactive power over frequency transformation has not been clearly addressed. This paper explains how real and reactive powers are preserved over transformation of frequency in the equivalent circuit of DFAG. Theoretical derivations are verified against PSCAD/EMTDC ^® simulation of DFAG.

10.1109/pesgm.2014.6939854

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Citations (0)

Model Verification of Fixed Series Compensation Devices Using Synchronized Data

IEEE Transactions on Power Delivery (2015)

Swaroop Gajare Ashok Kumar Pradhan Sukumar Brahma

Regulating agencies mandate that model verification of power system components must be performed to make sure that system analysis software performs accurately. Such verification is necessary for series compensation devices used in transmission systems, since they deteriorate due to aging or prolonged subjection to stressed conditions, leading to changes in compensation levels or voltage-current characteristics of the metal-oxide varistor (MOV) protecting them. This paper presents a method that uses synchronized time-domain data captured by intelligent electronic devices at both ends of a line for model verification of a fixed series compensation device installed at one location in the line. The electromagnetic transient line model is used to calculate the current and voltage across the compensation device, which, in turn, are used to determine the actual compensation and the actual voltage-current characteristics of MOVs. These characteristics are used to detect failures in MOV and spark gap. PSCAD/EMTDC is used to test the method.

Varistor

Transient (computer programming)

Line (geometry)

Emtp

10.1109/tpwrd.2015.2464100

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Citations (13)

Development and Testing of Protection Scheme for Renewable-Rich Distribution System

Sukumar Brahma Satish J. Ranade Mohamed Elkhatib Abraham Ellis Matthew J. Reno

As the penetration of renewables increases in the distribution systems, and microgrids are conceived with high penetration of such generation that connects through inverters, fault location and protection of microgrids needs consideration. This report proposes averaged models that help simulate fault scenarios in renewable-rich microgrids, models for locating faults in such microgrids, and comments on the protection models that may be considered for microgrids. Simulation studies are reported to justify the models.

Penetration (warfare)

Microgrid

10.2172/1395757

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Citations (2)

Trends in Electric Power Engineering Education: An Analysis of Future Challenges

IEEE Power and Energy Magazine (2018)

Dennis Ray Nilanjan Ray Chaudhuri Sukumar Brahma

University power engineering education has undergone considerable changes over the last ten years. Student interest has risen, and more faculty and staff are being employed to meet the increased enrollment. Research funding has grown as well, and curricula have evolved to meet the educational needs of the next generation of power engineers.

Power engineering

10.1109/mpe.2018.2833264

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Citations (4)

Identify Significant Phenomenon-Specific Variables for Multivariate Time Series

IEEE Transactions on Knowledge and Data Engineering (2019)

Yifan Hao Huiping Cao Abdullah Mueen Sukumar Brahma

Multivariate time series (MTS) are collected for different variables in studying scientific phenomena or monitoring system health where each time series records the values of one variable for a time period. Among the different variables, it is common that only a few variables contribute significantly to a specific phenomenon. Furthermore, the variables contributing significantly to different phenomena are often different. We denote the different variables that contribute to the occurrences of different phenomena as Phenomenon-specific Variables (PVs). In this paper, we formulate a novel problem of identifying significant PVs from MTS datasets. To analyze MTS data, feature extraction techniques have been extensively studied. However, most of them identify important global features for one dataset and do not utilize the temporal order of time series. To solve the newly introduced problem, we propose a solution framework, CNN _mts -X, which is a new variant of the Convolutional Neural Networks (CNN) and can embed other feature extraction techniques (as X). Furthermore, we design a CNN _mts -LR method that implements a new feature identification approach (LR) as Xin the CNN _mts -X framework. The LR method leverages both Linear Discriminant Analysis (LDA) and Random Forest (RF). Our extensive experiments on five real datasets show that the CNN _mts -LR method has exhibited much better performance than several other baseline methods. Using 30 percent of the PVs discovered from the CNN _mts -LR, classifications can achieve better or similar performance than using all the variables.

Identification

Feature (linguistics)

10.1109/tkde.2019.2934464

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Citations (10)

Comparison of PR and PI Controllers for Inverter Control in an Unbalanced Microgrid

Phani Gadde Sukumar Brahma

High penetration of renewable-fed Inverter Based Resources(IBRs) will most likely be an integral part of microgrids in the near future. Since such microgrids will, in most cases, evolve from existing distribution feeders, it will be unbalanced in terms of loads, phases, and feeder impedances. Typical control strategy of a conventional inverter that follows the grid voltage and frequency, while injecting positive-sequence current can lead to undesirable performance, especially in the islanded mode of operation. So, for the proper functioning of these microgrids, there is a need for grid-forming inverters that can enable acceptable performance and coexist with conventional grid-following inverters that supply only positive-sequence currents. In addition to the control objectives, limiting of inverter output during faulted or overload conditions with a current limiter is essential. These control objectives can be implemented in both the synchronous reference frame (dq coordinates) and the natural reference frame (abc coordinates). However, a comparison of inverter response, dynamics, and implementation are needed to understand each controller's merit as relates to this specific topology. This paper compares the control performance of the two approaches for a highly unbalanced microgrid in grid-connected and islanded modes. Acceptable operating conditions with stability against disturbances and faults are the primary focus of this study.

Microgrid

Current limiting

10.1109/naps50074.2021.9449699

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Citations (12)

The Education and Training of Future Protection Engineers: Challenges, Opportunities, and Solutions

IEEE Transactions on Power Delivery (2009)

Sukumar Brahma J. De La Ree Juan M. Gers A.A. Girgis S.H. Horowitz

It is becoming increasingly clear that electric power systems are undergoing rapid changes due to deregulation, the penetration of new technologies, and the adoption of efficient computation, communications, and control mechanisms. The primary goal of this paper is to recognize the importance of education and the training of future protection engineers and, second, to suggest course content needed to meet this challenge.

Deregulation

Power-system protection

10.1109/tpwrd.2009.2014029

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Citations (33)