Adaptive Sliding-Mode Control in Bus Voltage for an Islanded DC Microgrid

Abstract EN

The control of bus voltage is a crucial task for the stable operation of islanded DC microgrids.

To improve the DC bus voltage control dynamics and stability, this paper proposes an adaptive sliding-mode control method based on large-signal model.

The sliding-mode control, adaptive observation, and fix-frequency pulse width modulation technology are adopted and combined efficiently, which guarantee stable bus voltage and the constant switching frequency of closed-loop system, regardless of how the parameters vary with the variable constant-power loads and uncertainties.

In addition, the reference values can be quickly tracked by the state variables using the proposed method without any additional sensors/hardware circuits.

Therefore, this method is beneficial for the scalability and plug-play of the distributed generators and loads within the DC microgrids.

The performance of the proposed control method has been successfully verified in simulation.