Safety-Constrained Multi-Agent Reinforcement Learning for Power Quality Control in Distributed Renewable Energy Networks

This paper examines the difficulties of managing distributed power systems, notably due to the increasing use of renewable energy sources, and focuses on voltage control challenges exacerbated by their variable nature in modern power grids. To tackle the unique challenges of voltage control in distributed renewable energy networks, researchers are increasingly turning towards multi-agent reinforcement learning (MARL). However, MARL raises safety concerns due to the unpredictability in agent actions during their exploration phase. This unpredictability can lead to unsafe control measures. To mitigate these safety concerns in MARL-based voltage control, our study introduces a novel approach: Safety-Constrained Multi-Agent Reinforcement Learning (SC-MARL). This approach incorporates a specialized safety constraint module specifically designed for voltage control within the MARL framework. This module ensures that the MARL agents carry out voltage control actions safely. The experiments demonstrate that, in the 33-buses, 141-buses, and 322-buses power systems, employing SC-MARL for voltage control resulted in a reduction of the Voltage Out of Control Rate (%V.out) from 0.43, 0.24, and 2.95 to 0, 0.01, and 0.03, respectively. Additionally, the Reactive Power Loss (Q loss) decreased from 0.095, 0.547, and 0.017 to 0.062, 0.452, and 0.016 in the corresponding systems.