Search Results for author: Aranya Chakrabortty

Found 11 papers, 1 papers with code

Robust and Scalable Game-theoretic Security Investment Methods for Voltage Stability of Power Systems

no code implementations10 Mar 2022 Lu An, Pratishtha Shukla, Aranya Chakrabortty, Alexandra Duel-Hallen

We develop investment approaches to secure electric power systems against load attacks where a malicious intruder (the attacker) covertly changes reactive power setpoints of loads to push the grid towards voltage instability while the system operator (the defender) employs reactive power compensation (RPC) to prevent instability.

Distributed Multi-Agent Reinforcement Learning Based on Graph-Induced Local Value Functions

no code implementations26 Feb 2022 Gangshan Jing, He Bai, Jemin George, Aranya Chakrabortty, Piyush K. Sharma

Achieving distributed reinforcement learning (RL) for large-scale cooperative multi-agent systems (MASs) is challenging because: (i) each agent has access to only limited information; (ii) issues on convergence or computational complexity emerge due to the curse of dimensionality.

Multi-agent Reinforcement Learning reinforcement-learning +1

Distributed Cooperative Multi-Agent Reinforcement Learning with Directed Coordination Graph

no code implementations10 Jan 2022 Gangshan Jing, He Bai, Jemin George, Aranya Chakrabortty, Piyush. K. Sharma

In this work, we study MARLs with directed coordination graphs, and propose a distributed RL algorithm where the local policy evaluations are based on local value functions.

Multi-agent Reinforcement Learning reinforcement-learning +1

Hierarchical Frequency and Voltage Control using Prioritized Utilization of Inverter Based Resources

no code implementations8 Sep 2021 Rahul Chakraborty, Aranya Chakrabortty, Evangelos Farantatos, Mahendra Patel, Hossein Hooshyar, Atena Darvishi

We propose a novel hierarchical frequency and voltage control design for multi-area power system integrated with inverter-based resources (IBRs).

Designing Optimal Key Lengths and Control Laws for Encrypted Control Systems based on Sample Identifying Complexity and Deciphering Time

no code implementations26 Apr 2021 Kaoru Teranishi, Tomonori Sadamoto, Aranya Chakrabortty, Kiminao Kogiso

Based on these two tractable new notions, we propose a systematic method for designing the both of an optimal key length to prevent system identification with a given precision within a given life span of systems, and of an optimal controller to maximize both of the control performance and the difficulty of the identification.

Relation

Decomposability and Parallel Computation of Multi-Agent LQR

no code implementations16 Oct 2020 Gangshan Jing, He Bai, Jemin George, Aranya Chakrabortty

Conditions for decomposability, an algorithm for constructing the transformation matrix, a parallel RL algorithm, and robustness analysis when the design is applied to non-homogeneous MAS are presented.

Hierarchical Reinforcement Learning Reinforcement Learning (RL)

Model-Free Optimal Control of Linear Multi-Agent Systems via Decomposition and Hierarchical Approximation

no code implementations14 Aug 2020 Gangshan Jing, He Bai, Jemin George, Aranya Chakrabortty

The first component optimizes the performance of each independent cluster by solving the smaller-size LQR design problem in a model-free way using an RL algorithm.

Clustering Graph Clustering +1

Reduced-Dimensional Reinforcement Learning Control using Singular Perturbation Approximations

no code implementations29 Apr 2020 Sayak Mukherjee, He Bai, Aranya Chakrabortty

We present a set of model-free, reduced-dimensional reinforcement learning (RL) based optimal control designs for linear time-invariant singularly perturbed (SP) systems.

Clustering reinforcement-learning +1

Efficient Randomized Algorithms for Subspace System Identification

1 code implementation26 Mar 2020 Rachel Minster, Arvind K. Saibaba, Jishnudeep Kar, Aranya Chakrabortty

Eigensystem Realization Algorithm (ERA) is a data-driven approach for subspace system identification and is widely used in many areas of engineering.

Numerical Analysis Numerical Analysis

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