Siemens Aktiengesellschaft

Tobias Bernhard

Jörg Dorn

Mike Dommaschk

Ingo Euler

Jörg Lang

Klaus Würflinger

Quoc-Buu Tu

Franz Karlecik-Maier

Carsten Wittstock

John-William Strauss

Jürgen Rittiger

Oliver Venjakob

In the method for closed-loop control of at least two converters in an energy transmission and/or distribution system, each rectifier regulator and each inverter regulator provides a differential DC voltage from the difference between a given set DC voltage and the relevant received measured DC voltage, and also provides a differential DC current from a differential DC current from the difference between a set DC current and the corresponding received measured DC current. Each converter is a self-commutated converter with power semiconductors. The rectifier regulation of the provided converter is regulated such that the sum of the product of the differential voltages and the value of given set DC current at the corresponding rectifier and the differential current is a minimum. The inverter regulation regulates the corresponding inverter such that the sum between the differential voltage and the differential current is a minimum.

Closed-loop control method for an HVDC transfer installation having a DC voltage intermediate circuit and self-commutated converters

A cost-effective device for influencing the transmission of electrical energy of an alternating voltage line with a plurality of phases has phase modules, which each have an alternating voltage terminal for connecting to a phase of the alternating voltage line and two connecting terminals. A phase module branch extends between each connecting terminal and each alternating voltage terminal. The phase module branch is formed of a series connection of sub-modules, each having a power semiconductor circuit and an energy accumulator connected in parallel to the power semiconductor circuit. The connecting terminals are connected to one another. The power semiconductor circuit is equipped with power semiconductors that can be switched off and are connected to each other in a half bridge.

Active filter having a multilevel topology

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Hirschaid, Germany

Tobias Bernhard