  This paper presents a supervised multi-agent safe policy learning (SMAS-PL)
method for optimal power management of networked microgrids (MGs) in
distribution systems. While conventional reinforcement learning (RL) algorithms
are black-box decision models that could fail to satisfy grid operational
constraints, our proposed method is constrained by AC power flow equations and
other operational limits. Accordingly, the training process employs the
gradient information of operational constraints to ensure that the optimal
control policy functions generate safe and feasible decisions. Furthermore, we
have developed a distributed consensus-based optimization approach to train the
agents' policy functions while maintaining MGs' privacy and data ownership
boundaries. After training, the learned optimal policy functions can be safely
used by the MGs to dispatch their local resources, without the need to solve a
complex optimization problem from scratch. Numerical experiments have been
devised to verify the performance of the proposed method.
