| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a system interconnection inverter for accurately correcting a DC component generated at output current, and to provide a system interconnection system. <P>SOLUTION: This system interconnection system includes an inverter 5 which is connected to a DC power supply 2, converts DC power into AC power and outputs it to a commercial system 3; a shunt 10 for detecting the output current of the inverter 5; a low-pass filter 11 for detecting the DC component from the output of the shunt 10; an isolated amplifier 13 for amplifying the output of the low-pass filter 11; a zero signal generator 14 for outputting the signal equivalent to the signal inputted into the isolated amplifier 13 to the isolated amplifier 13 at the predetermined timing when there is no output current of the inverter 5; a reference value storage circuit 16 for storing the output value of the isolated amplifier 13 when the signal from the zero signal generator 14 is inputted into the isolated amplifier 13 as a reference value; and an adder for correcting the reference value by the direct current component of the output current of the inverter 5 outputted from the isolated amplifier 13. <P>COPYRIGHT: (C)2004,JPO |
