Converter control method and device for current THD adjusting under low load of converter

摘要

A converter control method and apparatus for adjusting current harmonic distortion in a low-load condition are disclosed. The converter control device includes a load amount calculating section for calculating a current load amount and a switching frequency adjusting section for adjusting a switching frequency of the IGBT according to a load ratio obtained by comparing the load amount calculated by the load amount calculating section with a rated load amount, The frequency adjustment section can make the switching frequency in the low load section greater than the switching frequency in the high load section.