Event based robust action for fault restrained secondary control of DC microgrid

Abstract

In modern power grid, dc microgrid is widely investigated to enhance their performance capabilities and operating ranges. The main issue in the operation of dc microgrid is to ensure adequate current sharing between converters, which can be achieved by droop control phenomena. Current sharing in the dc microgrid caused voltage discrepancy that needs to be compensated simultaneously with the current sharing. In this paper distributed secondary control to compensate voltage variation under converter current sharing through consensus-based sliding mode control (SMC) is proposed. Fault tolerant control is designed by formulating optimal control computation as per event triggering law. To achieve consensus control, communication graph theory is utilized to stabilizes required communication pattern between converters. Rigorous Lyapunov based stability bounds are derived to achieve event control to compensate actuator fault. Simulations are conducted to validate the feasibility and efficacy of the proposed control scheme. © 2021 IEEE