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Based on subarea division of the power system and multithread technology, a distributed parallel coordinated control strategy for automatic voltage control system is proposed. Using auxiliary problem principle (APP) method, a complex power system is decomposed into several logical independent subsystems geographically, which are coordinated via restrictions of the jointed borders. An iterative computation framework is formed and the influence on the internal system exposed by external system is considered through exchanging the information of boundary nodes. The regional power system coordinated control problem is decomposed into several parallel coordinating subsystem optimization ones and solved with the particle swarm optimization algorithm. Considering coordinated control between provincial and regional power systems, the subsystem computes the maximum devoting/removing reactive power. Considering the correlation with voltage and reactive power in each subsystem, the reserve gateway reactive power capacity is computed and provided to provincial AVC system. After receiving the adjustable range of gateway power factors, which is computed and sent by provincial AVC system based on the reserve gateway reactive power capacity, regional AVC system finds a balance between reactive power flow and the minimum network loss. In order to avoid the bottleneck problem of data upload and order transmission in centralized parallel computation, each subsystem is encapsulated and parallel computed by multithread technology. The proposed parallel control algorithm applies to a practical regional grid, and the results indicate that the algorithm reduces the calculation complexity with higher efficiency and convergence.