METHOD FOR DISCRIMINATING STATE OF OPERATION OF WIND TURBINE GENERATOR

摘要

PROBLEM TO BE SOLVED: To provide a method for discriminating the state of operation of a wind turbine generator in an interconnection system wherein wind turbine generators using pole-change induction generators are interconnected. SOLUTION: The method for discriminating the state of operation of a wind turbine generator involves a measuring means for measuring generator output power, a computing means that computes oscillation frequency based on the measured generator output, and a discriminating means that compares the computed oscillation frequency with a theoretical estimated frequency and thereby discriminates the state of the number of poles of the generator.