Siemens Aktiengesellschaft

Siemens Energy Global Gmbh & Co. Kg

Steffen Bernet

Rodrigo Alonso Alvarez Valenzuela

Herbert Gambach

Sebastian Semmler

Albrecht Gensior

Dominik Schuster

Jens Weber

Hans Bärnklau

Steffen Rohner

Hans Baernklau

Ignacio Esteban Lizama Arcos

In a method for generating with a modular multilevel power converter (M2C) having a plurality of sub-modules a frequency-variable output voltage, the sub-modules are switched on and off to generate from an input voltage discrete voltage steps approximating an approximately sinusoidal alternating output voltage having a first angular frequency located between a zero frequency and a second angular frequency, and the input voltage is controlled or regulated as a function of the first angular frequency so as to be located between a lower angular frequency, which is equal to or greater than the zero frequency, and a third angular frequency, such that the input voltage increases with increasing first angular frequency, thereby reducing capacitor complexity in the power converter.

Method for producing an output voltage and assembly for performing the method

A method for operating a multi-phase modular power inverter having DC input terminals and AC phase voltage output terminals connected to a load, phase modules connected between the DC input terminals, with each phase module composed of valve arms connected in series at a connection point forming an AC phase voltage output terminal which is connected to a load, each valve arm having a plurality of power inverter cells with turn-off semiconductor switches and a choke connected in series, includes controlling, with a control device, the turn-off semiconductor switches of each power inverter cell as a function of a plurality of setpoint values, wherein the setpoint values are generated such that a time-averaged energy value stored in a capacitor of a corresponding power inverter cells is predetermined by an operating point of the load and-or an operating mode of the modular multi-level power inverter.

Method for operating a multi-phase modular multi-level power converter

Growing community of inventors

Radeberg, Germany

Steffen Bernet