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. 12, 1987
Filed:
Dec. 13, 1984
Helmut Neupauer, Erlangen, DE;
Siemens Aktiengesellschaft, Munich, DE;
Abstract
The orthogonal components of the voltage vector of an a-c voltage network are transformed by means of a vector rotator, smoothed and transformed back. The frequency of the transformation elements required for the transformation in the vector rotator is set during a network disturbance under controlled conditions in accordance with a stored frequency value. After the end of the network disturbance, the direction given by the smoothed transformed orthogonal components is controlled to a reference value in that the frequency of the transformation elements is readjusted according to the direction deviation. The phase of the transformation elements determines the phase of the co-system fundamental of the network. A counter system fundamental can also be taken into consideration. Also if the returning power network contains asymmetrical and harmonic containing transients, a reference voltage synchronous with the fundamental can be obtained thereby within a few milliseconds for synchronizing network controlled converters.