MAXIMUM POWER POINT TRACKING CONTROL METHOD FOR SOLAR BATTERY

PURPOSE:To prevent the operating voltage from being largely apart from a maximum power point by dispensing with control of the maximum power pint and keeping the operating voltage in an unchanged state if generated power is changed by the change of the solar radiation quantity while judging the change cause of the generated power. CONSTITUTION:A measuring device 4 measures the power generated by a solar battery 1 and stores the measured values in a memory device 5. A control circuit 3 decides whether the generated power is changed by the change of the operating voltage or the change of the solar radiation quantity. When the change of the solar radiation quantity is performed, a power converter 2 is instructed to dispense with tracking control of the maximum power point, and the maximum power point tracking control is performed only when the solar radiation is stable. That is, all the measured values of the measurement value W1 set before the change of the operating voltage, the measurement value W2 set after the change of the operating voltage, and the measurement value W3 set when the changed operating voltage before the change is restored are stored and then compared with each other. Then the operating voltage before the change is kept when W1W3 are satisfied respectively.