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:
Jan. 02, 2007
Filed:
Apr. 30, 2004
Duo Deng, Canton, MI (US);
Anil Tuladhar, Dearborn Heights, MI (US);
Kenneth J. Farkas, Brighton, MI (US);
Kerry E. Grand, Chesterfield, MI (US);
Duo Deng, Canton, MI (US);
Anil Tuladhar, Dearborn Heights, MI (US);
Kenneth J. Farkas, Brighton, MI (US);
Kerry E. Grand, Chesterfield, MI (US);
Ballard Power Systems Corporation, Dearborn, MI (US);
Abstract
A power system employs an outer voltage feedback loop and an inner current feedback loop to control a power converter, such as a DC to AC inverter for transferring electrical power between a power source, for example a photovoltaic array, and a load, for example a power grid. The outer loop accommodates variations in the output of the power source, for example accommodating anomalies in IV characteristics such as IV droop characteristic associated with photovoltaic cells. The outer loop may employ a first control regime or a second control regime, for example, dependent on whether a DC bus voltage or power is smaller than a value corresponding to measurement resolution or expected noise.