VIRTUAL Graduate Seminar with Qianzhi Zhang: Distributed Optimal Conservation Voltage Reduction in Integrated Primary-Secondary Distribution Systems

Date(s) - 17 Nov 2021
1:10 PM - 2:00 PM


Speaker: Qianzhi Zhang, ECpE Graduate Student

Advisor: Zhaoyu Wang

Title: Distributed Optimal Conservation Voltage Reduction in Integrated Primary-Secondary Distribution Systems

Abstract: This presentation will introduce an asynchronous distributed leader-follower control method to achieve conservation voltage reduction (CVR) in three-phase unbalanced distribution systems by optimally scheduling smart inverters of distributed energy resources (DERs). One feature of the proposed method is to consider integrated primary-secondary distribution networks and voltage-dependent loads. To ease the computational complexity introduced by a large number of secondary networks, we partition a system into distributed leader-follower control zones based on the network connectivity. To address the non-convexity from the nonlinear power flow and load models, a feedback-based linear approximation using instantaneous power and voltage measurements is proposed. This enables the online implementation of the proposed method to achieve fast-tracking of system variations led by DERs. Another feature of the proposed method is the asynchronous implementations of the leader-follower controllers, which makes it compatible with non-uniform update rates and robust against communication delays and failures. Numerical tests are performed on a real distribution feeder in Midwest U. S. to validate the effectiveness and robustness of the proposed method.

Bio: Qianzhi Zhang received the M.S. degree in electrical and computer engineering from Arizona State University. He is currently pursuing the Ph.D. degree with the Department of Electrical and Computer Engineering, Iowa State University. His research interests include the applications of machine learning and advanced optimization techniques in power system operation and control.

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