CAPACITY ESTIMATION DEVICE OF DC LINK CAPACITOR OF INVERTER

摘要

PROBLEM TO BE SOLVED: To provide a capacity estimation device of a DC link capacitor of an inverter that separates a voltage command for generating AC power from voltage commands for unit power cells of a cascade H bridge high-voltage inverter, outputs different voltage commands to respective unit power cells, and estimates a capacity of the DC link capacitor using an equation related to the power of the DC link capacitor.SOLUTION: The capacity estimation device of the present invention selects a unit power cell for estimating a capacity of the DC link capacitor from a plurality of unit power cells 20a-20f, corrects the command voltage for controlling the plurality of unit power cells 20a-20f, and estimates a capacity of the DC link capacitor.