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Grid-Coupled Dynamic Response of Battery-Driven Voltage Source Converters

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Document pages: 6 pages

Abstract: With the increasing interest in converter-fed islanded microgrids,particularly for resilience, it is becoming more critical to understand thedynamical behavior of these systems. This paper takes a holistic view ofgrid-forming converters and considers control approaches for both modeling andregulating the DC-link voltage when the DC-source is a battery energy storagesystem. We are specifically interested in understanding the performance ofthese controllers, subject to large load changes, for decreasing values of theDC-side capacitance. We consider a fourth, second, and zero-order model of thebattery; and establish that the zero-order model captures the dynamics ofinterest for the timescales considered for disturbances examined. Additionally,we adapt a grid search for optimizing the controller parameters of the DC DCcontroller and show how the inclusion of AC side measurements into the DC DCcontroller can improve its dynamic performance. This improvement in performanceoffers the opportunity to reduce the DC-side capacitance given an admissible DCvoltage transient deviation, thereby, potentially allowing for more reliablecapacitor technology to be deployed.

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