High dynamic control of a three-level voltage-source-converter drive for a main strip mill
Bocker, J.
Janning, J.
Jebenstreit, H.
Am Brandpfuhl 8W, Berlin;
This paper appears in: Industrial Electronics, IEEE Transactions on
Publication Date: Oct 2002
Volume: 49,
Issue: 5
On page(s): 1081- 1092
ISSN: 0278-0046
INSPEC Accession Number: 7413702
Digital Object Identifier: 10.1109/TIE.2002.803220
Current Version Published: 2002-11-07
Abstract
A high dynamic control system for the Alspa VDM 7000 medium-voltage drive was implemented, which provides fast torque response times of a few milliseconds despite the typically low switching frequency of gate-turn-off thyristors which is necessary to achieve high efficiency. The drive system consists of a three-level voltage-source converter with active front end and a synchronous motor. The drive has most recently been applied to a main strip mill. It provides a maximum of 8.3-MW mechanical power with a rated motor voltage of 3 kV. Besides motor torque as the main control objective, the control system has to comply with a number of additional objectives and constraints like DC-link voltage regulation and balancing, current and torque harmonics, motor flux, and excitation.
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