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. 04, 2006
Filed:
Jan. 26, 2005
Reijo Virtanen, Vantaa, FI;
Osmo Pasuri, Ojakkala, FI;
Reijo Virtanen, Vantaa, FI;
Osmo Pasuri, Ojakkala, FI;
ABB Oy, Helsinki, FI;
Abstract
A method for operating a doubly-fed machine by determining its rotational speed (n), forming a rotational speed reference (n), measuring network voltage and current, and calculating network active power (P) and reactive power (Q). Thereafter, calculating shaft torque (T) based on active power (P) and rotating speed (n), forming a frequency reference (F) for the inverter based on machine rotating speed (n), rotating speed reference (n), shaft torque (T), and the known pole pair number and network frequency, forming a reactive power reference (Q) for the machine. Forming an Ir compensation reference (IR) for the inverter on the basis of the reactive reference (Q) and the reactive power (Q), and controlling the inverter to produce rotor voltage based on frequency reference (F) and the IR compensation reference