Patent ID: 9735698
Date: 2017-08-15
CPC Classifications: H02M,H02P

Claim:
1. A method of controlling a power conversion apparatus which comprises: a first power supply line and a second power supply line; a rectifier for rectifying a first AC voltage to be inputted into a DC voltage to output said DC voltage to between said first power supply line and said second power supply line; a capacitor provided between said first power supply line and said second power supply line; a reactor constituting an LC filter, together with said capacitor; and a power converter for converting a DC voltage supported by said capacitor into a second AC voltage based on a switching signal to be inputted and then applying said second AC voltage to a load to flow an alternating current, said method comprising: detecting a voltage of said reactor taking a potential on a side of said capacitor as a reference; when at least a first voltage control rate command which is a ratio of an amplitude of said second AC voltage to an average value of said DC voltage is smaller than a predetermined value, calculating a correction coefficient which is made smaller as said first voltage control rate command becomes smaller; making a correction on said first voltage control rate command to subtract a correction amount obtained by multiplying said voltage of said reactor by said correction coefficient, thereby generating a second voltage control rate command; and giving said switching signal which is generated based on said second voltage control rate command to said power converter.