Abstract
This paper presents a modified droop-based control for dc voltage restoration in a Multi-Terminal dc (MTdc) system of parallel-operated buck converters. The proposed control structure is introduced to a proportional-derivative (PD) droop controller, which realises the active power — dc voltage droop control method. The additional control structure consists of an adaptive integrator, which decreases the voltage static error of the PD droop controller. The achieved voltage restoration architecture is thus fully decentralised and therefore does not depend on communication nor relies on additional secondary controllers. The integrator gain is adaptive through a scheduling schema and a switching schema. The former decouples the dynamics of the voltage restoration controller from those of the PD droop controller. The latter facilitates the simultaneous fulfilment of the constraints on voltage and power deviations. Simulation results validate the performance of the proposed control structure.
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