Philipp Lohdefink

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In vector controlled operation of a permanent magnet synchronous generator (PMSG), the rotor position must be known at all times. As position sensors are expensive and vulnerable in harsh environment, sensorless strategies are becoming more and more popular. The paper gives a short overview over common sensorless position estimation strategies and shows a(More)
In this paper, a modeling approach for a brushless doubly-fed induction machine is proposed using an equivalent system of cascaded doubly-fed induction machines. A Steady-state and a transient model are developed and the results show a good agreement to measurements conducted on a set of two 1.5 kW doubly-fed induction machines. One main aspect of this work(More)
The concept of distributed energy generation in DC-microgrids is becoming more and more popular, due to the enhanced advantages of energy self-supply and minimizing of conversion losses. Based on a sewage application containing a photovoltaic system and a pump application, this paper describes the individual subsystems of a DC-microgrid. A Matlab/Simulink(More)
Sensorless field oriented control has always been an area of study with many insecurities, parameter sensitivities and instabilities. In this paper, after giving a short overview of standard sensorless field oriented control algorithms, a new technology by Texas Instruments called “InstaSPIN” will be evaluated. InstaSPIN promises to solve all(More)
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