| 摘要 |
<P>PROBLEM TO BE SOLVED: To control potential fluctuation of a solar light panel in a power conversion device 12, where the voltage generated in the solar light panel is boosted, and AC power is supplied to a system after AC conversion. <P>SOLUTION: A second inverter 11 is connected to one terminal of an AC side in a first inverter 10, where DC voltage obtained by boosting solar light voltage is set to be a first DC power supply 2, and a third inverter 12 to the other terminal, in series. The entire output voltage is obtained as the total sum of generated voltages of the respective inverters 10 to 12. In the second and third inverters 11 and 12, voltages in DC power supplies are substantially equal, and PWM control is performed by using carrier waves whose waveforms match, and the output timings of the output voltage pulses are matched and the fluctuations of midpoint potential of the first DC power supply 2 is controlled. <P>COPYRIGHT: (C)2008,JPO&INPIT |
