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:
Oct. 10, 2023
Filed:
Dec. 07, 2020
Method and system for switching from grid-connected to grid-disconnected and power conversion system
Kehua Hengsheng Co., Ltd., Fujian, CN;
Zhangzhou Kehua Technology Co., Ltd., Fujian, CN;
Haisen Chen, Fujian, CN;
Chunbao Zeng, Fujian, CN;
Baoshuai Jiao, Fujian, CN;
Binbin Lin, Fujian, CN;
Xi Chen, Fujian, CN;
KEHUA HENGSHENG CO., LTD., Fujian, CN;
ZHANGZHOU KEHUA TECHNOLOGY CO., LTD., Fujian, CN;
Abstract
A method and a system for switching from grid-connected to grid-disconnected, and a power conversion system are provided. The method includes determining whether a power grid is abnormal based on a power grid parameter obtained when a PCS is grid-connected and operates in a current source mode, turning off a switching cabinet if the power grid is abnormal, switching from a current source mode to a voltage source mode, sending a command to instruct a grid-connected/grid-disconnected switch to switch from a grid-connected loop to a grid-disconnected loop, controlling an output parameter to smoothly transit from an abnormal parameter value recorded when the power grid is abnormal to a rated parameter value, and supplying power to a load according to the rated parameter value. In this way, seamless switching from grid-connected to grid-disconnected can be achieved, thereby ensuring stability of power supply.