POWER CONVERSION APPARATUS

摘要

A power converting apparatus (100) comprising an inverter (4) for converting direct current power into alternating current power and supplying it to a load, a converter (3) for converting an alternate current from an alternate current power source (1) into a direct current and supplying it to the inverter (4), and a direct current voltage converter (7) for converting the voltage value of an electrical power stored within an accumulator battery (8) and supplying a direct current from the accumulator battery (8) to the inverter (4) when there is any anomaly in the power supply from the alternate current power source (1). The converter (3) includes a first three-level circuit which is a multi-level circuit. Similarly, the direct current voltage converter (7) includes a second three-level circuit. A controller (10) controls the first and second multi-level circuits thereby limiting electrical potential fluctuation at a neutral point (21) of first and second capacitors (15, 16).