Method and apparatus for correction of a detected faulty actual valve of a signal affected by harmonic vibrations

US5289366A · kind A · utility

Assignee

• Siemens Aktiengesellschaft · DE

Inventors

• Franz Bauer · Herzogenaurach, DE
• Michael Braun · Altensteig, DE
• Georg Heinle · Erlangen, DE
• Hubert Schierling · Erlangen, DE

Key dates

• Filing date: Jul 13, 1992
• Grant date: Feb 22, 1994
• Expiry date: Jul 13, 2012

Classification

• Technology area (CPC H): Electricity
• CPC primary: H02P29/50
• WIPO field: Electrical machinery, apparatus, energy
• WIPO sector: Electrical engineering

Abstract

An actual value (u.sub.ixRF) of a signal (i.sub.xRF) affected by harmonics may be corrected. A harmonic signal (u.sub.iF) superimposed on the signal (i.sub.xRF) is generated using a harmonic-free setting signal(u.sub.yR), a known pulse pattern (.alpha..sub.1, .alpha..sub.2, ..., .alpha..sub.5) stored in the memory of a modulator, and an equivalent model of the control system. The mean value (u.sub.iF) of this harmonic signal (u.sub.iF) is determined by a second integrating actual value acquisition device. The mean value (u.sub.iF) is subtracted as a correction value from the actual value (u.sub.ixRF), which is affected by errors. In this way, an errorfree actual value (u.sub.ixR) is obtained for a signal (i.sub.xRF), the harmonics of which are not filtered out in the actual value determination by means of an integrating actual value acquisition device.