Sandro Gunter

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Knowledge of the frequency depending grid impedance is necessary for adequate grid integration, including setting of standards, of renewable energy sources. It is also essential for the design of power converters for renewable energy sources. In this paper wide frequency range measurements of the positive sequence grid impedance in public low voltage grids(More)
The measurement of the grid impedance is important for filter and control design, for active filter functionality of grid connected inverters and also for distribution network operators. It supports knowledge of the grid and design of decentralized energy generator power flow. Not only the impedance at fundamental frequency but also the impedance at(More)
Power semiconductor losses of hysteresis current controlled grid connected 2-level and 3-level ANPC inverters will be presented in this paper. A special focus will be on the calculations for currents consisting of two components, one current with the frequency of the grid and one with a harmonic frequency. These currents are typical for inverters in grid(More)
In this paper the design and measurement results of a grid analysis and grid impedance measurement system are presented. The system is provided to measüre the freqüency dependent grid impedance in different PoCs to detect resonances and improve the power quality especially of grids with high amount of DERs. Moreover Active Filtering (AF) and(More)
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