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Improved droop control method with precise current sharing and voltage regulation

Improved droop control method with precise current sharing and voltage regulation

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The droop control method is one of the simplest methods for load sharing control of multiple converters. Although the current sharing precision can be adjusted to be well through the droop parameter, the voltage regulation precision is hard to be maintained well due to the voltage droop. In addition, the stability and dynamic response is usually degraded since the small-signal model of multiple converter system is usually changed significantly. To cope with these two limitations, this study presents an improved droop control method with automatic master to correct the voltage regulation. A robust control scheme is also provided to maintain a good stability and dynamic response as the design of the normal condition. The proposed method is confirmed with some simulation and experimental results.

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