Venkataramana Ajjarapu


Thomas M. Whitney Professor of Electrical Engineering


1122 Coover
2520 Osborn Dr.
Ames, IA 500111046



PhD, Electrical Engineering, University of Waterloo (1986)

MTech, Electrical Engineering, Indian Institute of Technology, Knapur (1982)

BTech, Electrical Engineering, Jawaharlal Nehru Technological University, Kakinada,  (1979)

Research Interests

Core Area(s): Systems and controls, electric power and energy systems, power system security, voltage stability, wind and solar energy integration, real-time control of power and power electronics systems, distributed resources impact on electric grid

Department’s Strategic Area(s): Energy infrastructure; data, decisions, network & autonomy


Google Scholar Profile:

  • Amarsagar R. Matavalam, Ankit Singhal and V. Ajjarapu “Monitoring Long Term Voltage Instability due to Distribution & Transmission Interaction using Unbalanced µPMU & PMU Measurements” IEEE transactions on Smart Grid, vol 11, No.1, pp. 873-883, 2020
  • Alok Kumar Bharati and V. Ajjarapu “Investigation of Relevant Distribution System Representation with DG for Voltage Stability Margin Assessment” IEEE Transactions on Power Systems, Vol. 25, No. 3, pp. 2072-2081, 2020
  • Amarsagar R. Matavalam and V. Ajjarapu, “PMU based Monitoring and Mitigation of Delayed Voltage Recovery using Admittances” IEEE Transactions on Power Systems, Vol.34, No. 6, pp. 4451-4463, 2019.
  • Venkatraman, S. Khaitan and V. Ajjarapu” Dynamic Co-Simulation Methods for Combined Transmission –Distribution System with Integration Time Step Impact on Convergence, IEEE transaction on Power systems, Vol. 34, No. 2, pp. 1171-1181, 2019
  • Ashraf Radaideh, Umesh Vaidya and V. Ajjarapu” Sequential Set-point Control for Heterogeneous Thermostatically Controlled Loads Through an Extended Markov Chain Abstraction, IEEE Transaction On Smart Grid, Vol. 10, No.1, pp.11-127,2019
  • Singhal, V. Ajjarapu, J.C. Fuller, and J. Hansen,” Real-Time Local Volt/VAR Control Under External Disturbances with High PV Penetration,” IEEE Transactions on Smart Grid, Vol. 10, No. 4, pp. 3849-3859, 2019
  • Sun, Q. Guo, V. Ajjarapu et all, “Review of Challenges and Research Opportunities for Voltage Control in Smart Grids, IEEE Transaction on Power Systems, Vol. 34, No. 4, pp. 2790-2801, 2019
  • Subhrajit Sinha, Pranav Sharma, Umesh Vaidya, and Venkataramana Ajjarapu, “On Information Transfer-Based Characterization of Power System Stability”, IEEE Transactions on Power Systems,, Vol. 34, No. 5, pp. 3804-3812, 2019
  • Amarsagar R. Matavalam and V. Ajjarapu “Sensitivity based Thevenin Index with Systematic Inclusion of Reactive Limits “IEEE Transactions on Power Systems, Vol. 33, No.1, pp. 932-942, January 2018
  • Shiyang Li and V. Ajjarapu” Adaptive Online Monitoring of Voltage Stability Margin via Local Regression, IEEE Transactions on Power Systems, Vol. 33, No.1, pp. 701-713, January 2018