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:
May. 03, 2016
Filed:
Mar. 14, 2013
Zhenhuan Yuan, Shanghai, CN;
Shaofeng Zhang, Shanghai, CN;
Haihui LU, Shanghai, CN;
Lixiang Wei, Mequon, WI (US);
Russel J. Kerkman, Milwaukee, WI (US);
Richard Lukaszewski, New Berlin, WI (US);
Ahmed Mohamed Sayed Ahmed, Mequon, WI (US);
Robert J. Breitzmann, South Russell, OH (US);
Zhenhuan Yuan, Shanghai, CN;
Shaofeng Zhang, Shanghai, CN;
Haihui Lu, Shanghai, CN;
Lixiang Wei, Mequon, WI (US);
Russel J. Kerkman, Milwaukee, WI (US);
Richard Lukaszewski, New Berlin, WI (US);
Ahmed Mohamed Sayed Ahmed, Mequon, WI (US);
Robert J. Breitzmann, South Russell, OH (US);
Rockwell Automation Technologies, Inc., Mayfield Heights, OH (US);
Abstract
Methods and apparatus are presented for unintentional islanding detection for grid tie converters in which the phase angle disturbance is introduced by modification of grid side converter switching control signals and a mismatch of reactive power between generation and the grid load is formed upon the occurrence of unintentional islanding, where the applied phase disturbance is determined according to two pre-defined curves to form an equivalent positive feedback at different frequencies to prevent the converter from forming an island at a new stable frequency after the grid is disconnected.