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1. (WO2017036712) METHOD FOR CONTROLLING A MODULAR MULTI-LEVEL CONVERTER, CONTROL DEVICE FOR A MODULAR MULTI-LEVEL CONVERTER, AND MODULAR MULTI-LEVEL CONVERTER HAVING SAID CONTROL DEVICE

Pub. No.:    WO/2017/036712    International Application No.:    PCT/EP2016/068493
Publication Date: Fri Mar 10 00:59:59 CET 2017 International Filing Date: Thu Aug 04 01:59:59 CEST 2016
IPC: H02M 7/48
Applicants: SIEMENS AKTIENGESELLSCHAFT
Inventors: ALVAREZ VALENZUELA, Rodrigo Alonso
DOMMASCHK, Mike
KUBERA, Sascha
Title: METHOD FOR CONTROLLING A MODULAR MULTI-LEVEL CONVERTER, CONTROL DEVICE FOR A MODULAR MULTI-LEVEL CONVERTER, AND MODULAR MULTI-LEVEL CONVERTER HAVING SAID CONTROL DEVICE
Abstract:
The invention relates to a method for controlling a modular multi-level converter (4) having sub-modules (9), wherein each sub-module (9) has semiconductor switches (T1,T2), wherein the semiconductor switches (T1,T2) are controlled using a switching frequency (f) in order to provide an alternating voltage (16) as the output voltage of the converter (4), characterised in that an operating state of the converter (4) is determined and the switching frequency (f) of the semiconductor switches (T1,T2) is set according to the operating state, such that an operating aspect of the converter (4) is optimised. The invention also relates to a control device for a modular multi-level converter and to a modular multi-level converter having said control device.