| 摘要 |
<p><P>PROBLEM TO BE SOLVED: To restrain a higher harmonic wave while improving efficiency during system connection. <P>SOLUTION: An electric power conversion device 1 connecting a direct-current power source 4 to a system 3 comprises an inverter circuit 13, a converter circuit 14, and a control device 15. The control device 15 proportional-integral controls only the converter circuit 14 on the basis of a current flowing through a normal coil L2 when ¾Vac¾>Vdc is satisfied. At that time, the inverter circuit 13 is controlled as a rectifier. Also, the control device 15 hysteresis controls the inverter circuit 13 on the basis of the current flowing through the normal coil L2 when ¾Vac¾<Vdc is satisfied. At that time, the converter circuit 14 is controlled as a direct coupling circuit. While efficiency is improved by restraining switching, a higher harmonic wave component of an alternating-current is restrained. To further restrain the higher harmonic wave component, a period during which both of hysteresis control of the inverter circuit 13 and a proportional integral control of the converter circuit 14 are executed at the same time. <P>COPYRIGHT: (C)2013,JPO&INPIT</p> |
