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

Claim 26:
27. A protection method for a photovoltaic power generation system, applied to the photovoltaic power generation system,
wherein the photovoltaic power generation system comprises a protection apparatus for the photovoltaic power generation system, a power circuit, and a plurality of photovoltaic units,
wherein the protection apparatus comprises a direct current bus, a controller, a plurality of protection switches, and a plurality of interfaces,
wherein the protection apparatus is connected to the plurality of photovoltaic units via the plurality of interfaces,
wherein the plurality of photovoltaic units are coupled to the direct current bus inside the protection apparatus to form at least one branch,
wherein each branch of the at least one branch is connected to at least two photovoltaic units connected in parallel,
wherein the power circuit is a direct current-direct current (DC-DC) conversion circuit or a direct current-alternating current (DC-AC) conversion circuit,
wherein the power circuit is connected to the direct current bus, and
wherein the protection method comprises:
detecting, 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, controlling at least some of the plurality of protection switches to be disconnected, to reduce a quantity of photovoltaic units connected in parallel, so that a maximum of two or three of the plurality of photovoltaic units are connected in parallel.