| 摘要 |
PROBLEM TO BE SOLVED: To obtain a power converter for solar battery power generation which can expand an operatable voltage range and efficiently convert DC power from a solar battery into AC power. SOLUTION: When the DC voltage of the solar battery 1 is included within a fixed range, a maximum power follow-up control circuit 7 increases/decreases the DC voltage of the solar battery 1 within the fixed range based upon a solar battery characteristic curve, controls the voltage so that AC power to a power system is maximized, and when the DC voltage of the battery is less than the fixed range, a DC voltage fixed control circuit 15 controls the DC voltage of the battery 1 so as to be set to the lower limit value of the fixed range based upon the solar battery characteristic curve. When the DC voltage exceeds the fixed range and the characteristic curve intersects with a conversion power upper limit curve at two points, an operatable point searching control circuit 16 controls voltage so that a point having lower voltage out of the two points is set as an operation point. |
