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A graph policy network approach for Volt-Var Control in power distribution systems

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  • Lee, Xian Yeow
  • Sarkar, Soumik
  • Wang, Yubo

Abstract

Volt-var control (VVC) is the problem of operating power distribution systems within healthy regimes by controlling actuators in power systems. Existing works have mostly adopted the conventional routine of representing the power systems (a graph with tree topology) as vectors to train deep reinforcement learning (RL) policies. We propose a framework that combines RL with graph neural networks and study the benefits and limitations of graph-based policy in the VVC setting. Our results show that graph-based policies converge to the same rewards asymptotically, however at a slower rate when compared to vector representation counterpart. We conduct further analysis on the impact of both observations and actions: On the observation end, we examine the robustness of graph-based policies on two typical data acquisition errors in power systems, namely sensor communication failure and measurement misalignment. Furthermore, we study the robustness of graph-based policies to erroneous topological information in the graph representation. Our results reveal that graph-based policies are significantly more robust than policies with conventional dense network representations. On the action end, we show that actuators have various impacts on the system, thus using a graph representation induced by the physical power systems topology may not be the optimal choice. In the end, we conduct a case study to demonstrate that the choice of readout function architecture and graph augmentation can further improve training performance and robustness.

Suggested Citation

  • Lee, Xian Yeow & Sarkar, Soumik & Wang, Yubo, 2022. "A graph policy network approach for Volt-Var Control in power distribution systems," Applied Energy, Elsevier, vol. 323(C).
  • Handle: RePEc:eee:appene:v:323:y:2022:i:c:s0306261922008479
    DOI: 10.1016/j.apenergy.2022.119530
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    References listed on IDEAS

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    1. Volodymyr Mnih & Koray Kavukcuoglu & David Silver & Andrei A. Rusu & Joel Veness & Marc G. Bellemare & Alex Graves & Martin Riedmiller & Andreas K. Fidjeland & Georg Ostrovski & Stig Petersen & Charle, 2015. "Human-level control through deep reinforcement learning," Nature, Nature, vol. 518(7540), pages 529-533, February.
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    Cited by:

    1. Guo, Guodong & Zhang, Mengfan & Gong, Yanfeng & Xu, Qianwen, 2023. "Safe multi-agent deep reinforcement learning for real-time decentralized control of inverter based renewable energy resources considering communication delay," Applied Energy, Elsevier, vol. 349(C).
    2. Jude Suchithra & Amin Rajabi & Duane A. Robinson, 2024. "Enhancing PV Hosting Capacity of Electricity Distribution Networks Using Deep Reinforcement Learning-Based Coordinated Voltage Control," Energies, MDPI, vol. 17(20), pages 1-27, October.
    3. Kabir, Farzana & Yu, Nanpeng & Gao, Yuanqi & Wang, Wenyu, 2023. "Deep reinforcement learning-based two-timescale Volt-VAR control with degradation-aware smart inverters in power distribution systems," Applied Energy, Elsevier, vol. 335(C).
    4. Jude Suchithra & Duane Robinson & Amin Rajabi, 2023. "Hosting Capacity Assessment Strategies and Reinforcement Learning Methods for Coordinated Voltage Control in Electricity Distribution Networks: A Review," Energies, MDPI, vol. 16(5), pages 1-28, March.

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