ANTI-COUNTERCURRENT GRID-CONNECTED PHOTOVOLTAIC POWER GENERATION SYSTEM

摘要

An anti-countercurrent grid-connected photovoltaic power generation system (1) comprises at least one inverter (11) and an acquisition and control unit (12) connected with each inverter. The acquisition and control unit determines whether a countercurrent phenomenon occurs according to power output to a load (3) by a public power grid (2) and power output to the load by the grid-connected photovoltaic power generation system, which are acquired in real time. When it is determined that a countercurrent phenomenon occurs, the acquisition and control unit controls operation of the inverter, and reduces the power output to the load by the anti-countercurrent grid-connected photovoltaic power generation system until the acquisition and control unit determines that no trend toward a countercurrent phenomenon exists. The system can predict occurrence of a countercurrent phenomenon in advance, and avoid occurrence of the countercurrent phenomenon.