The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Apr. 28, 2020
Filed:
May. 23, 2019
Huawei Technologies Co., Ltd., Shenzhen, Guangdong, CN;
Huawei Technologies Co., Ltd., Shenzhen, CN;
Abstract
An inverter anti-islanding control system includes a phase-shift loop () and a drive circuit (). The phase-shift loop () includes a first input end (), a second input end (), a third input end (), a fourth input end (), a first output end (), and a second output end (). The drive circuit () includes a first input end (), a second input end (), a third input end (), and an output end (). The first output end () of the phase-shift loop () is connected to the first input end () of the drive circuit (), and the second output end () of the phase-shift loop () is connected to the second input end () of the drive circuit (). In the inverter anti-islanding control system, when an inverter is in an island state, a frequency of an inverter alternating current end voltage is deviated to a second frequency by using the phase-shift loop (), so that the second frequency triggers frequency protection to disconnect the inverter from an electrical network, to be specific, the inverter is out of the island state.