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

Claim 28:
29. The protection method according to claim 27, wherein a respective protection switch is a rotary direct current switch disconnector or a direct current circuit breaker;
wherein the direct current bus is connected to an input end of the power circuit via a direct current switch; and
wherein the method further comprises: controlling, based on an absolute value of a current of the direct current bus being greater than a second current value and an absolute value of a voltage of the direct current bus being less than a first voltage value, at least some of the plurality of protection switches to be disconnected so that no or less than three photovoltaic units are connected in parallel or connected to the direct current bus in each branch of the at least one branch.