| 摘要 |
PURPOSE: An economical grid-connected PCS(Power Conversion System) is provided to maximize continuity and stability by improving the efficiency of DC(Direct Current) power supply and to reduce maintenance cost. CONSTITUTION: An economical grid-connected PCS includes an AC(Alternating Current) power network(100), an AC load(200), a dispersed power source(300), a DC load(400), and a bidirectional power control type grid-connected PCS(500). The AC power network generates AC power and supplies power to the AC load, and supplies remained surplus power to the DC load when the power, supplied to the DC load through the dispersed power source, is insufficient. The dispersed power source generates DC power independently, supplies power to the DC load, and supplies remained surplus power to the AC load when power is insufficient at the AC load. When the power used by the DC load is bigger than the power supplied through the dispersed power source, or the dispersed power source is unable to output power, the bidirectional power control type grid-connected PCS cuts off unnecessary loads of the DC load and supplies power to the DC load through the AC power network to supplement the power deficit. [Reference numerals] (100,AA) AC power network; (200) AC load; (400) DC load; (500) Bidirectional power control type grid connected PCS; (BB) Interface between heterogeneous power networks; (CC) DC power network; (DD) Distribution power(sunlight, wind power, etc.); (EE) Distribution power(battery)
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