METHOD AND SYSTEM FOR MONITORING STRUCTURAL HEALTH OF A FILTER IN A WIND TURBINE, AND A WIND TURBINE

摘要

A method for monitoring structural health of a filter comprising a capacitor in a wind turbine, a system for monitoring structural health of a filter comprising a capacitor in a wind turbine, and a wind turbine are provided. The method includes measuring a capacitor harmonic current at an AC side of an inverter and after a grid choke, and measuring a capacitor harmonic voltage; determining an impedance value based on the measured capacitor harmonic current and the measured capacitor harmonic voltage; comparing the determined impedance value with a reference impedance value; and determining the structural health of the filter based on the difference between the determined impedance value and the reference impedance value.