Patent ID: 11870238
Assignee: HUAWEI DIGITAL POWER TECHNOLOGIES CO., LTD.
Field: Electrical machinery, apparatus, energy (Electrical engineering)
Classification: CPC H  Y | IPC H

Claim 32:
33. A protection apparatus for a photovoltaic power generation system, comprising:
a plurality of protection switches;
a direct current busy configured to separately connect to a plurality of photovoltaic units via the plurality of protection switches, wherein the plurality of photovoltaic units are connected in parallel to at least one branch of the direct current bus, and each branch of the at least one branch is connected to at least two photovoltaic units connected in parallel;
a power circuit, wherein the power circuit is a direct current-direct current (DC-DC) conversion circuit or a direct current-alternating current (DC-AC) conversion circuit, and the power circuit is configured to connect to the direct current bus; and
a controller configured to:
detect, based on a parameter detection value of the at least one branch or a parameter detection value of the direct current bus, that the photovoltaic power generation system is faulty; and
based on having detected that the photovoltaic power generation system is faulty, control the plurality of protection switches to disconnect at least some of the plurality of photovoltaic units from the direct current bus, to reduce a quantity of photovoltaic units connected in parallel, so that a maximum of three of the plurality of photovoltaic units are connected in parallel.