Distributed Fixed-Time Secondary Control for DC Microgrid Via Dynamic Average Consensus

In this paper, a dynamic average consensus-based distributed fixed-time secondary control scheme is proposed for an islanded DC microgrid, to achieve both current sharing among the converters and voltage regulation of the DC bus within a fixed settling time. The secondary controller is designed using sign functions and fraction-based feedback signals for accelerating the convergence. To release the requirement on the piror knowledge of the communication topology of DC microgrid, an adaptive law is proposed to update the control gain autonomously. The proposed secondary controllers do not need to deliver the output current data to the neighbors and sample the voltage of the DC bus, making them easier to be implemented in practice. To demonstrate the effectiveness of the proposed secondary controllers, five simulation cases and three experiment tests are carried out. It can be illustrated that the proposed secondary control schemes are resilient to the constant power loads and sources, the failure of communication links, and the scenario of plug-and-play.