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The growing integration of distributed energy resources into distributionsystems poses challenges for voltage regulation. Dynamic VAR Compensators(DVCs) are a new generation of power electronics-based Volt/VAR compensationdevices designed to address voltage issues in distribution systems with a highpenetration of renewable generation resources. Currently, the IEEE Std.1547-based Volt/VAR Curve (VV-C) is widely used as the local control scheme forcontrolling a DVC. However, the effectiveness of this scheme is not welldocumented, and there is limited literature on alternative control andplacement schemes that can maximize the effective use of a DVC. In this paper,we propose an optimal dispatch and control mechanism to enhance theconventional VV-C based localized DVC control. First, we establish amulti-objective optimization framework to identify the optimal dispatchstrategy and suitable placement for the DVC. Next, we introduce two supervisorycontrol strategies to determine the appropriate instances for adjusting theVV-C when the operating condition changes. The outlined scheme comprises twoprimary stages: time segmentation and VV-C fitting. Within this framework, eachtime segment aims to produce optimized Q-V trajectories. The proposed method istested on a modified IEEE 123-bus test system using OpenDSS for a wide range ofoperating scenarios, including sunny and cloudy days. Simulation resultsdemonstrate that the proposed scheme effectively reduces voltage variationscompared to the standard VV-C specified in IEEE Std. 1547.

Adopting Dynamic VAR Compensators to Mitigate PV Impacts on Unbalanced Distribution Systems