| 摘要 |
PURPOSE:To provide an inverter which is compact and light and can be operated being linked with a single-phase three-wire power distribution line by an insulation system using a high-frequency transformer. CONSTITUTION:A PWM-control high frequency inverter bridge 2 converts DC generated by a solar cell 1 into a high-frequency AC. The high harmonic component of high-frequency pulsating current which is rectified by a diode bridge 4 is eliminated by low-pass filters 5a and 5b to obtain commercial-frequency all-wave rectification waveforms. A commercial-frequency inverter bridge 6 performs foldback control of DC which is subjected to all-wave rectification from the low-pass filters 5a and 5b convert into a commercial-wave sinusoidal wave AC. Then, the output terminal of the commercial-frequency inverter bridge 6 is connected to voltage lines u and v of a single-phase three-wire power distribution live via a linking relay 7 and low-pass filters 8a and 8b and the center tap of a high-frequency transformer 3 is connected to a neutral line (n) of the single-phase three-wire power distribution line via a current detector 9 and the lining relay 7, thus performing linking operation to a commercial system 30 with single-phase three wire. |
