Method for Monitoring the Health of Aluminium Electrolytic Capacitor
Non-Confidential description of the invention
The invention relates to the field of power converters, and a method for online monitoring of health of a capacitor by comparing the second harmonic impedance of the capacitor. This provides a method for online monitoring of health of capacitor in a single phase grid connected PV system. The method comprising, sampling of PV current and inductor current, evaluation of capacitor current, passing the PV voltage and capacitor current through the second order generalized integrator to extract second harmonic ripple component of capacitor voltage and current, evaluating the second harmonic impedance of the capacitor, comparing the evaluated impedance with a predefined impedance value to detect the performance degradation of the capacitor, and generating a warning signal after detecting the performance degradation of the capacitor or else resample the quantities. The said method utilizes the voltage and current sensors used for maximum power point tracking (MPPT) controller and closed loop control of system.
Abhinav Arya(Student,M.Tech), Nikunj Agarwal (M.Tech,EE), Waseem Ahmed(PhD,EE), Sandeep Anand(EE)
Date of Filing