document: High dynamic control of a three-level voltage-source-converter drive for a main strip mill 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
doc_bio_tags: O O O O O O O O O O O B I O B I I I O O O O O O O O O O O O O O O O O O O O O O O O B I O O O O O O O O O B O O O O O O O O O O O O O O O O B I O O O O O O O O O O O B I O O O O O O O B I O O O B I O B I O O O O O O O B I O O O O O O O O O O O O O O O O O O O O O O O O B I O B I O O B
extractive_keyphrases: high dynamic control system switching frequency efficiency synchronous motor strip mill mechanical power motor voltage control objective torque harmonics motor flux excitation 3 kv
abstractive_keyphrases: medium-voltage drive gate-turn-off thyristors three-level voltage-source converter dc-link voltage regulation dc-link voltage balancing current harmonics 8.3 mw