Method and apparatus for controlling a pulsed frequency converter

US4480301A · kind A · utility

Assignee

• Siemens Aktiengesellschaft · DE

Inventors

• Gerhard Pfaff · Mainburg, DE
• Albert Wick · Geiselhöring, DE

Key dates

• Filing date: Jul 19, 1982
• Grant date: Oct 30, 1984
• Expiry date: Jul 19, 2002

Classification

• Technology area (CPC H): Electricity
• CPC primary: H02M7/529
• WIPO field: Electrical machinery, apparatus, energy
• WIPO sector: Electrical engineering

Abstract

A system for forming addressing signals for addressing respective converter switches of a frequency converter; the frequency converter being of the type which is provided with DC input terminals for receiving electrical energy which is conducted to phase output terminals when the converter switches are operated in response to the addressing signals. Each of the combinations of converter switches is associated with a discrete space vector, and a load voltage vector is determined. In operation, two of the discrete space vectors which are adjacent to the voltage space vector are addressed for respective dwell times which correspond to the components of the voltage space vector as impressed upon the adjacent discrete space vectors. Either prior to or after the addressing of the adjacent discrete space vectors within a switching cycle, a short circuit state is addressed. In one embodiment, the order in which the adjacent discrete space vectors are addressed is reversed for each subsequent switching cycle. Also, the DC input terminals to which the phase outputs are short circuited are alternated.