Solar power generation device

摘要

A transmitting circuit is connected to a power line at current flow-in sides to solar battery strings, and a receiving circuit is connected to the power line at current flow-out sides to the solar battery strings. An attenuating circuit connected in series to a bypass diode is provided in a bypass circuit. The transmitting circuit transmits a periodic signal of a predetermined frequency to the power line. The receiving circuit receives via the solar battery strings a transmission signal transmitted from the transmitting circuit to the power line. A determining circuit determines that, when it is detected that an amplitude of a transmission signal received by the receiving circuit is attenuated by a predetermined value or more, direct-current power is conducted to the bypass circuit.

主权项

1. A solar power generation device comprising:
one or more solar cells electrically connected in series or in parallel to form a connection unit; and a bypass circuit that is connected in parallel to the connection unit and performs a conduction operation by bypassing the connection unit when electromotive force of the connection unit is equal to or lower than a predetermined value, wherein a solar battery string is formed by electrically connecting in series one or more solar battery modules, each of which is equipped with one or more sets of combination of the connection unit and the bypass circuit, and the solar battery string is connected by a power line, and the solar power generation device further comprises: a transmitting circuit connected in series with and upstream of the solar battery string, the transmitting circuit transmitting transmission signal of a predetermined amplitude through the solar battery string; a receiving circuit connected in series with and downstream of the solar battery string, the receiving unit receiving the transmitted transmission signal after the transmission signal passes through the solar battery string; an attenuating circuit that is provided in the bypass circuit and attenuates an amplitude of the transmission signal, wherein the transmission signal includes plural frequency components, each frequency component being attenuated by a bypass circuit in a different one of the solar battery modules in the solar battery string when direct-current power is conducted by the respective bypass circuit.