Abstract
This paper proposes a new hierarchical distributed voltage control method for distributed generations (DGs), which provides voltage support coordinating with an under-load tap changer (ULTC) in active distribution networks. Based on bi-layer control architecture, this method utilizes the DG reactive power output adjustment to divide the network into several distributed autonomous zones (DAZs) and realize distributed autonomous voltage control. The quantity and control regions of DAZs change in response to variations of grid conditions. When DAZs voltage cannot be self-sustaining, the coordinated voltage control between ULTC and other self-sustaining DAZs in active distribution is achieved by the novel control method. Case studies are conducted based on IEEE 33-bus distribution system, and the effectiveness and validation of the proposed method are analyzed.
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