Abstract:
Since a DC micro-grid has power converters connected by different line impedances, tuning the voltage controller provides a simple and intuitive tradeoff between voltage regulation and current sharing. A flexible distributed control strategy using the containment-based voltage controller and consensus-based current controller balances the two control objectives.
Instead of only controlling the average voltage, each terminal voltage can be controlled within a prescriptive range, and converter current-sharing performance can be regulated. By tuning controller weightings, voltage bounding and current sharing errors can be compromised. The large-signal model analyzes control parameter tuning.
The strategy can adapt to different control needs. Experimental results and comparisons show that the proposed method and compromised tuning work under resistive loads, constant power loads, and dynamic voltage boundary conditions.
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