Siemens Aktiengesellschaft

Christoph Brunotte

Marc Hiller

Rainer Sommer

Franz Bauer

Hans Tischmacher

Klemens Kahlen

Electrical malfunctions in a network which are caused by torque fluctuations of an electric motor, in particular flicker, are reduced by using a control device. For simple and cost-effective minimizing or even correction of such malfunctions with the control device, the control device has at least one first input for supplying an input signal which contains information suitable for determining the loading of the network by torque fluctuations and at least one output for transmitting an output signal to at least one converter supplying the electric motor. This makes it possible to reduce or ideally to eliminate electrical malfunctions in a network which are caused by torque fluctuation of the electric motor.

Control device for eliminating malfunctions in a network

A shaft-driven generator system has a generator connected to a converter. An inverter supplies an AC voltage on a network side. The converter and the inverter are linked via a DC link circuit. The inverter has at least two phase modules, which each have an upper and a lower valve branch, which each have a plurality of two-pole sub-systems connected electrically in series. Each sub-system has a unipolar storage capacitor, to which a series circuit of two gate-controlled turn-off semiconductor switches is connected electrically in parallel. Each semiconductor switch has a diode connected antiparallel therewith. Thus, a shaft-driven generator system is obtained that has a DC-link converter as a static frequency converter for complying with the required network feedback and for managing transient operating states.

Shaft-driven generator system

Converter and method for controlling a converter with power semiconductor switches, having a filter () which is connected to the power semiconductor switches and having a drive circuit () which is connected to the power semiconductor switches for the purpose of modulation, wherein, as a result of the modulation, a fundamental at a fundamental frequency (fGS) is generated in a passband (P) of the filter (), modulation products are generated in a first frequency band (FB), in a second frequency band (FB) and in an intermediate frequency band (ZFB) which is formed between the first frequency band (FB) and the second frequency band (FB), the modulation products in the intermediate frequency band (ZFB) are reduced in comparison with the modulation products in the first frequency band (FB) and the modulation products in the second frequency band (FB); and the intermediate frequency band (ZFB) is generated, in a resonant range (R) of a resonant frequency (fres) of the filter (), between the passband (P) and an attenuation range (D) of the filter (). A converter having an output-side sinusoidal filter whose dimensions have been reduced is thus obtained.

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Erlangen, Germany

Christoph Brunotte