Dominique RoggoHES-SO Valais-Wallis, Switzerland, Sion · Institute of Systems Engineering
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Citations since 2017
8 Research Items
The research team led by Associate Professor Dominique Roggo, Institute of Systems Engineering at HES-SO Valais-Wallis is focusing on grid integration of distributed Energy Resources with emphasis on Power Quality and EMC. Frequency dependent Grid Impedance plays a key role in interference propagation, PLC signal attenuation and converters controller stability. The team has developed a portable 1 to 500 kHz Grid Impedance meter. The device has been used to characterize LV AC distribution grid and equipment connected to it in this frequency range. Dominique is also involved in the practical development of LVDC microgrids. A 20 kW 3-level converter was developped and will be used in order evaluate the plus and cons of different AFE topologies in the domain of Power Quality and EMC.
In this paper, a 15 kVA soft open point converter is presented. The converter design and manufacturing have been presented in previous papers. The aim of this paper was to show the results of the devices in a full-scale laboratory environment, Gridlab, made of four distribution LV feeders, each rated 40 A. The tests demonstrated the good dynamics o...
The paper presents and evaluates three advanced methods for the characterization of the low-voltage (LV) grid access impedance for the frequency range assigned to Narrow Band-Power Line Communications (NB-PLC): 9 kHz to 500 kHz. This study responds to the recent demand from both regulatory bodies and Distribution System Operators about the need for...
Medium to long-distance underground AC lines and both short- and long-distance HVDC are frequently integrated into network expansion plans. In conjunction with growing numbers of power electronic converters in the grid there is a rising risk related to the effects of harmonic currents. Resonance analysis should therefore be part of power system exp...
In this paper the main features of a transformerless 10 kW three-phase inverter, compliant to IEC-61850 communication standard, will be presented. It will be used for a research project concerning the study of grid harmonics pollution produced by high penetration of DER (Distributed Energy Resources). It will allow testing different harmonics mitig...
The project DC-bus for microgrid at HES-SO Valais-Wallis is a full scale demonstrator where the main electrical components in a modern building, i.e. photovoltaic power sources, various consumers and distributed storage systems are directly connected to a common DC distribution system. This paper describes the specifically designed DC/DC converters...
Active In-feed Converters (AIC) generate harmonics with frequencies up to 100 kHz resulting in power losses over the distribution lines, transformers and consumer loads, and interferences with control signals. The value of the harmonic voltage at an In-plant Point of Coupling (IPC) depends on the grid impedance at the harmonic frequency. As the spe...
SCCER-FURIES is the Swiss national competence center mandated to develop, promote and deploy power grid-related innovative solutions toward the implementation of the Swiss Energy Strategy 2050. The SCCER-FURIES envisions the enabling of seamless and sustainable powering of Swiss citizens’ houses, businesses and communities, by developing and demonstrating with the Distribution and Transmission network operators the essential knowledge and technologies for a sustainable and stable electrical infrastructure of the future which integrates cleaner and reliable power supplies and storage facilities.