Sensor fault tolerant control of microgrid

This paper presents a sensor fault tolerant control approach for grid connected microgrids. The proposed approach diagnoses (detects and estimates) faults in the sensed microgrid output currents using sliding mode observer theory. Once a sensor fault is diagnosed, a mitigation action follows, which controls the output currents, using the estimated fault signals. The mitigation action ensures that the microgrid controller accurately generates pulse width modulation (PWM) signals so that the real and reactive powers output of the microgrid track their corresponding references. The accuracy and effectiveness of the proposed approach are verified through a case study, carried out on a grid connected microgrid.