State quantity detection method in power converting apparatus and power converting apparatus

摘要

A current-source converter includes high-arm side switching elements and low-arm side switching elements. A voltage between the DC power supply lines is detected as a line voltage of an input line, based on a conduction pattern of the high-arm side switching elements and the low-arm side switching elements.

主权项

1. A state quantity detection method in a power converting apparatus comprising:
a plurality of input lines to which a multi-phase voltage is inputted; first and second DC power supply lines; and a current-source converter including a plurality of high-arm side switching elements and a plurality of low-arm side switching elements, each of said high-arm side switching elements being connected between each of said input lines and said first DC power supply line, each of said low-arm side switching elements being connected between each of said input lines and said second DC power supply line, wherein, based on an instantaneous conduction pattern of said high-arm side switching elements and said low-arm side switching elements, a voltage between said first and second DC power supply lines is detected as a line voltage between said input lines.