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DC microgrid can obtain high efficiency due to the reduction of power processes from DC to AC at the generation side and from AC to DC at the consumption side. The distributed generators connected to DC-bus via power converters usually have different dynamic characteristics, this leads to a multi-time scale DC microgrid. This study proposes a time scale voltage droop control based on active disturbance rejection control (ADRC). It is not sensitive to system model uncertainties and external disturbances, moreover system dynamics can be tuned explicitly. Based on the proposed control method, a reduced-order model is developed to analyse system stability. Some experimental tests carried out in the authors' laboratory have verified the effectiveness of the proposed method.

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