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1. (WO2018001465) CONVERTER AND METHOD FOR OPERATING SAME

Pub. No.:    WO/2018/001465    International Application No.:    PCT/EP2016/065023
Publication Date: Fri Jan 05 00:59:59 CET 2018 International Filing Date: Wed Jun 29 01:59:59 CEST 2016
IPC: H02M 1/12
H02M 7/483
Applicants: SIEMENS AKTIENGESELLSCHAFT
Inventors: ANTES, Andreas
PIESCHEL, Martin
Title: CONVERTER AND METHOD FOR OPERATING SAME
Abstract:
The invention relates, amongst other things, to a method for operating a converter, in particular a multilevel converter (100) that is connected to a power supply network (1), which operates at a prespecified network frequency, and has at least one series circuit comprising at least two submodules (13) which are connected in series, wherein the submodules (13) of the series circuit each comprise at least two switching elements (S1-S4) and an energy store, in particular capacitor (19). According to the invention, the state of charge of the energy stores of the submodules (13) is controlled, specifically using a control signal (i_Stell_Aus), which is generated by an energy controller (20), as part of the method, by evaluating so as to form control error sampling values (e_Abtast) with a rate which is smaller than four times the network frequency, a control error signal (e), which indicates the deviation of the respective state of charge of the energy stores from a setpoint charging value (u_SM_Soll) or at least is dependent on this, and by generating the control signal (i_Stell_Aus) depending on these control error sampling values (e_Abtast).