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Distributed Frequency Control Over Time-Varying Communication Networks

Event Type
Seminar/Symposium
Sponsor
Grainger CEME
Location
4070 ECEB
Date
Mar 12, 2018   1:00 - 1:50 pm  
Speaker
Madi Zholbaryssov
Views
16

Slides

Video

 

Abstract

In this talk, we study AC microgrid dynamics with included primary and distributed secondary frequency controllers using time-varying communication networks with (i) bidirectional, and (ii) unidirectional communication links. For a certain class of controllers, the closed-loop dynamics solve a special multi-agent optimization problem by performing two steps: (i) gradient-descent, and (ii) distributed averaging – averaging with neighbors. This proposed framework allows the analysis of many of the existing distributed algorithms developed to solve a general multi-agent optimization problem over time-varying communication networks; including those that use the so-called subgradient-push algorithm to design a distributed frequency controller. We present the convergence analysis for the closed-loop system. In addition, we deploy this framework to propose a distributed frequency controller that does not require each agent (generator) to know its so-called out-degree – a necessary assumption for the convergence of the subgradient-push algorithm.

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