1.College of Information Engineering, Zhejiang University of Technology, Hangzhou 310023, China;2.College of Electrical Engineering, Zhejiang University, Hangzhou 310027, China

With the increasing penetration rate of renewable energy generation, the problem of voltage violation in the distribution system becomes more frequent, and efficient voltage management strategies are urgently needed to ensure the secure and economic operation of the distribution system. First, this paper establishes a dual-timescale voltage management model for the distribution system to realize the coordinated control of voltage regulators with different time response characteristics. Then, the voltage management models of the two time scales are modeled as Markov decision process (MDP). Effectively considering the temporal coupling relationship between the two time scales and the physical characteristics of controllable devices, the dual-timescale real-time voltage management is realized by using the multi-agent deep deterministic policy gradient algorithm and the double deep Q network algorithm to solve the model, respectively. Finally, the effectiveness of the proposed model and method is demonstrated by case studies on the IEEE 33-bus standard distribution system.