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- 저자 : Axel Mertens (검색결과 3 건)
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New Current Controller for Inverter Fed Medium Voltage Drives with LC Filter
Tomasz Laczynski,Axel Mertens 전력전자학회 2007 ICPE(ISPE)논문집 Vol.- No.-
In high power medium voltage drives, the switching frequency of power semiconductor devices is restricted because of high switching losses. Such drives often include an LC output filter, introducing a resonant circuit that may be excited for instance by fast control transients. One way to avoid such oscillations is using damping control schemes, which in turn usually require switching frequencies well above the filter resonance. This paper proposes a new predictive stator current controller that avoids the excitation of the filter resonance, performs active damping and allows fast current control while maintaining low switching frequency. Simulation results of a 2.4 ㎸ induction motor drive and experimental results obtained from a 55 ㎾ prototype a.c. drive demonstrate feasibility and good dynamic performance of the proposed control approach.
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Survey on the Hexverter Topology – A Modular Multilevel AC/AC Converter
Dennis Karwatzki,Lennart Baruschka,Axel Mertens 전력전자학회 2015 ICPE(ISPE)논문집 Vol.2015 No.6
The Hexverter modular multilevel converter topology has been recently proposed for three-phase to three-phase AC/AC conversion. This paper outlines the current state of the art of the Hexverter. The basic working principle is explained and the control concept is introduced. The differences to alternative topologies are discussed and possible applications are pointed out.
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Increased Signal-to-Noise Ratio of Sensorless Control Using Current Oversampling
Bastian Weber,Karsten Wiedmann,Axel Mertens 전력전자학회 2015 ICPE(ISPE)논문집 Vol.2015 No.6
This paper presents a novel approach based on current oversampling with low computational effort that significantly increases the signal-to-noise ratio with regard to sensorless control of permanent magnet synchronous machines at low and zero speed. The novel method is based on calculating arithmetic averages of all current samples taken during a period of pulse width modulation (PWM). This algorithm is implemented in a field programmable gate array (FPGA). Compared to a conventional current measurement with single sampling, the arithmetic average of the current samples has a much higher signal-to-noise ratio than the current samples themselves. The current derivative, which is used for sensorless control, is then calculated from the difference between two consecutive current averages. Experimental results validate the functionality of the novel approach.
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