Hybrid Sensor Fault Tolerant Control of Low Voltage DC Microgrid

Abstract

Recent times have seen the popularity of Low Voltage DC (LVDC) microgrids. Standalone LVDC microgrids have been quite effective in applications like rural electrification, data centre power systems, satellite microgrids. Voltage control and energy management are very critical in case of standalone LVDC microgrids. The sensor faults especially are critical to handle in standalone and safety critical systems. This work proposes a hybrid sensor fault tolerant control (HSFTC) strategy comprising of both analytical and hardware redundancy components. The analytical redundancy component is designed using a sliding mode observer in tandem with adaptive passivity based control, in order to handle voltage sensor faults. The double modular hardware redundancy component is designed to handle the battery current sensor faults. The performance of the proposed control under different situations of voltage and current sensor faults is observed through the simulation studies in MATLAB/SIMULINK platform. The proposed control strategy is compared with few popular control strategies and found to be effective at handling sensor faults.