Publications

Journals

• Ramapuram Matavalam A.R., K. P. Guddanti, Y. Weng and V. Ajjarapu, “Curriculum Based Reinforcement Learning of Grid Topology Controllers to Prevent Thermal Cascading,” in IEEE Transactions on Power Systems, 2022, doi: 10.1109/TPWRS.2022.3213487.
• Ramapuram Matavalam A.R.; U. Vaidya and V. Ajjarapu, “Propagating Uncertainty in Power System Initial Conditions Using Data-Driven Linear Operators”, in IEEE Transactions on Power Systems. doi: 10.1109/TPWRS.2022.3182570.
• Ramapuram Matavalam A.R.; S. M. H Rizvi, A. K. Srivastava and V. Ajjarapu,”Critical Comparative Analysis of Measurement based Centralized Online Voltage Stability Indices”, in IEEE Transactions on Power Systems. doi: 10.1109/TPWRS.2022.3145466.
• S. Liu; D.C. Mocanu; Ramapuram Matavalam A.R.; et al. “Sparse evolutionary deep learning with over one million articial neurons on commodity hardware”, in Neural Computing and Applications Vol. 33, 2021. https://doi.org/10.1007/s00521-020-05136-7
• K. Guddanti; Ramapuram Matavalam A.R. and Y. Weng, “PMU-based Distributed Non-iterative Algorithm for Real-time Voltage Stability Monitoring,” in IEEE Transactions on Smart Grid, vol. 11, no. 6, pp. 5203-5215, Nov. 2020.
• Ramapuram Matavalam A.R.; A. Singhal and V. Ajjarapu, “Monitoring Long Term Voltage Instability due to Distribution & Transmission Interaction Using micro-PMU & PMU Measurements,” IEEE Transactions on Smart Grid, vol. 11, no. 1, pp. 873-883,
• Ramapuram Matavalam A.R.; V. Ajjarapu, “PMU based Monitoring and Mitigation of Delayed Voltage Recovery using Admittances,” in IEEE Trans. on Power Systems, vol. 34, no. 6, pp. 4451-4463, Nov. 2019.
• Ramapuram Matavalam A.R.; V. Ajjarapu, “Sensitivity based Thevenin Index with Systematic Inclusion of Reactive Power Limits,” in IEEE Transactions on Power Systems, vol. 33, no. 1, pp. 932-942, Jan. 2018.

Peer Reviewed Conferences

• Ramapuram Matavalam A.R.; K. P. Guddanti and Y. Weng, “Curriculum Based Reinforcement Learning to Avert Cascading Failures in the Electric Grid”, in NEURIPS Workshop on Tackling Climate Change with Machine Learning , Dec 2022.
• Ramapuram Matavalam A.R.; R. Venkatraman; V. Ajjarapu, “Mitigating Delayed Voltage Recovery Using DER & Load Control in Distribution Systems”, in IEEE PES General Meeting, July 2022.
• Ramapuram Matavalam A.R.; Adrian Maldonaldo; V. Ajjarapu, “Efficient Data Driven Uncertainty Propagation in Power System Dynamics Using Low-Rank Randomized Koopman Operator Approximation”, in IEEE International Conference on Probabilistic Methods Applied to Power Systems, 2022.
• Ramapuram Matavalam A.R.; U. Vaidya; V. Ajjarapu, “Data-Driven Approach for Uncertainty Propagation and Reachability Analysis in Dynamical Systems”, in American Control Conference, 2020, vol., no., pp.1-5, July 2020.
• Ramapuram Matavalam A.R.; A. Singhal; V. Ajjarapu, “Identifying Long Term Voltage Stability Caused by Distribution Systems vs Transmission Systems”, in IEEE PES General Meeting, 2018, vol., no., pp.1-5, Aug 2018.
• Ramapuram Matavalam A.R.; A. K. Bharati, “Reliability Assessment of Industrial Circuit Breakers with Design Enhancements”, in International Conference on Probabilistic Methods Applied to Power Systems, 2018, vol., no., pp.1-5, July 2018.
• Ramapuram Matavalam A.R.; V. Ajjarapu, “Validation of the Sensitivity based Thevenin Index on Large Systems”, in IEEE PES General Meeting, 2017, vol., no., pp.1-5, July 2017.
• J.A.V. Vasquez; Ramapuram Matavalam A.R.; V. Ajjarapu, “Fast calculation of Thevenin equivalents for real-time steady state voltage stability estimation,” North American Power Symposium (NAPS), Denver, CO, 2016, pp. 1-7.
• Ramapuram Matavalam A.R.; V. Ajjarapu, “PMU based real-time monitoring for delayed voltage response,” in North American Power Symposium (NAPS), 2015, vol.,no., pp.1-6, 4-6 Oct. 2015.
• Ramapuram Matavalam A.R.; V. Ajjarapu, “Calculating the long-term voltage stability margin using a linear index,” in IEEE PES General Meeting, 2015, vol., no., pp.1-5,July 2015.
• Ramapuram Matavalam A.R.; et. al., “PMU based real-time short term voltage stability monitoring – Analysis and Implementation on a real-time test bed,” in North American Power Symposium (NAPS), 2014, vol., no., pp.1-6, 7-9 Sep. 2014.
• Ramapuram Matavalam A.R.; V. Ajjarapu, “Long term voltage stability Thevenin Index using voltage locus method,” in IEEE PES General Meeting, 2014, vol., no., pp.1-5, July 2014.
• Ramapuram Matavalam A.R.; N. Lakshminarasamma, “Analysis, design and implementation of soft switching in a synchronous converter,” 2011 International Conference on Power and Energy Systems, Chennai, 2011, pp. 1-6.

Patents

• Parashar M.; Pai G.; Ramapuram Matavalam A.R.; “Primary power grid frequency response characterization using phasor measurement unit data “, Patent US10074983B2, granted on Sep 2018.