To improve the adaptability of voltage regulation in active distribution networks (ADNs) with high photovoltaic (PV) penetration

this paper proposes a distributed Volt/Var control (VVC) strategy enabled by multi-agent deep reinforcement learning and implemented through heterogeneous PV inverters. First

a distributed VVC framework is established by partitioning the ADN into multiple sub-networks

each modelled as an agent

with the goal of minimizing voltage deviation. This control framework considers the heterogeneous operation modes of PV systems and utilizes both reactive power support and active power curtailment to maintain voltage within acceptable limits. Then

the VVC problem is formulated as a Markov game and solved using a multi-agent soft actor–critic algorithm. Simulation studies conducted on the IEEE 33-bus and 118-bus test systems validated the effectiveness of the proposed method

demonstrating its superior performance in reducing voltage fluctuations compared to benchmark approaches.