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PEOPLE@HES-SO – Annuaire et Répertoire des compétences
PEOPLE@HES-SO – Annuaire et Répertoire des compétences

PEOPLE@HES-SO
Annuaire et Répertoire des compétences

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Roggo Dominique

Roggo Dominique

Intervenant-e externe

Compétences principales

Power Quality

Electromagnetic Compatibility (EMC)

Low Voltage DC systems (LVDC)

Mains Communication Systems

e-Mobility

Power Electronics

  • Contact

  • Enseignement

  • Publications

  • Conférences

Contrat principal

Intervenant-e externe

Bureau: ENP.23.N414

HES-SO Valais-Wallis - Haute Ecole d'Ingénierie
Rue de l'Industrie 23, 1950 Sion, CH
HEI - VS
Domaine
Technique et IT
Filière principale
Systèmes industriels
BSc HES-SO en Energie et techniques environnementales - HES-SO Valais-Wallis - Haute Ecole d'Ingénierie
  • Wind Energy
BSc HES-SO en Systèmes industriels - HES-SO Valais-Wallis - Haute Ecole d'Ingénierie
  • Power Electronics

2021

Energetic simulation of DC railway micro-grid interconnecting with PV solar panels, EV charger infrastructures and electrical railway network
Article scientifique

Roggo Dominique

2020 IEEE Vehicle Power and Propulsion Conference, 2021

2020

15 kVA three-phase low-voltage SOP prototype laboratory tests results
Article scientifique ArODES

Thomas Pidancier, Mokhtar Bozorg, Dominique Roggo, Patrick Favre-Perrod, Mauro Carpita

Energies,  2020, vol. 13, article no. 3895

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Résumé:

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 of the SOP control and its usefulness in performing a suitable PQ control. They also showed an improvement in the voltage profile and in the load capacity of the overall network. In the final part of the paper, the feedback earned during the development and the test of this first prototype are presented. This feedback will benefit the team for the design of a new improved 50 kVA version.

2019

Comparison of measurement methods of LV grid access impedance in the frequency range assigned to Nb-Plc technologies
Article scientifique ArODES

Igor Fernandez, Igor de la Vega, Dominique Roggo, Robert Stiegler, Lino Capponi, Itziar Angulo, Jan Meyer, Amaia Arrinda

Electronics,  2019, vol. 8, no. 10

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Résumé:

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 accurate and validated methods for this frequency band, due to the limited knowledge of the impedance values in the electrical grid and their influence on NB-PLC transmission channels. In this paper, the results of a collaborative work to develop different proposals to overcome the challenges for the proper characterization of the frequency and time-varying grid impedance, from different theoretical approaches, are presented. The methods are compared in a controlled and isolated scenario: the impedance characterization of passive filters. Then, the results are validated two-fold: first, against theoretical simulations, based on the schematics provided by the manufacturer, and second, against the measurement results of a precision impedance meter, used as a reference of accuracy. The results demonstrate a high degree of precision of the three proposals to characterize the access impedance of the LV grid.

2018

Application of resonance analysis to AC-DC networks
Article scientifique ArODES

Olga Galland, Loïc Eggenschwiler, Rodolfo Horta, Walter Sattinger, Patrick Favre-Perrod, Dominique Roggo

IEEE Transactions on Power Delivery,  2018, 33, 3, pp. 1438-1447

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Résumé:

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 expansion planning. In this paper, network harmonic modeling and analysis are discussed, in particular, power transformer and power converter frequency models are proposed. Frequency scanning and resonance mode analysis are compared and discussed. The changes in resonance response due to transmission network expansion are drawn. The methods are applied to the investigation of the impact of one link reinforcement, both ac and ac solutions, as well as the impact of the power transformer disconnection. The performed analysis enables finding the resonance location at each studied case. The frequency analysis methods presented in this paper enable forseeing network frequency behavior that is valuable for both network analysis and network expansion planning.

2017

Frequency scans and resonance mode analysis for resonance problems identification in power networks in presence of harmonic pollution
Article scientifique ArODES

Loïc Eggenschwiler, Olga Galland, Damien Chollet, Fabrice Decorvet, Dominique Roggo, Patrick Favre-Perrod

CIRED - Open Access Proceedings Journal,  2017, no. 1, pp. 650-654

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Résumé:

The understanding of harmonics propagation in power systems recently gained interest. In high-voltage (HV) networks, the current trend of undergrounding is modifying the network resonance frequencies. In low-voltage (LV) distribution systems, the increasing deployment of decentralised generation induces new harmonic pollution, which could interfere with power line communications. In this analysis, the most important elements of power systems (overhead lines, underground cables, power transformers, linear loads and inverters) are modelled in frequency and integrated into frequency scan and resonance mode analysis methods. Two network types are analysed to point out the specificities of each network level: the first one is an extra high voltage (EHV)/HV network (380, 220, 125 and 50 kV) and the second one is a part of a medium-voltage/LV distribution system (20 kV and 400 V). With this method, the network behaviour in a large frequency bandwidth (up to 5 kHz for transport grids and up to 200 kHz for the distribution system) can be predicted. Recent network impedance measurements contribute to the validation of this method by showing the same trends and resonance frequencies close to the ones visible in the simulation results.

2023

Reproductibility of network impedance measurements using single-frequency and broadband signal injection
Conférence ArODES

Fredrick M. Mwaniki, Morteza Pourarab, Robert Stiegler, Jan Meyer, Dominique Roggo, Blaise Evequoz

Proceedings of the 13th IEEE International Workshop on Applied Measurements for Power Systems (AMPS 2023), 27-29 September 2023, Bern, Switzerland

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Résumé:

Characterization of frequency-dependent network impedance is vital for harmonic emission evaluation, stability studies as well as for the optimum design of power-line communication technologies. This work presents a simulation based performance comparison of three techniques that are used to obtain the network harmonic impedance. Two broadband methods, the passive pseudo-random binary sequence and the active pseudo-random impulse sequence, and the single-frequency injection are investigated. The methods are first applied to a passive network and then extended to a network with nonlinear equipment such as power electronic converters. The methods' performance is evaluated in terms of mean impedance and sub-cycle impedance. While the results of all three methods are comparable for the passive network, it differs in the presence of nonlinear devices, especially for the sub-cycle impedance, with the single-frequency injection method demonstrating superior results. The passive-pseudorandom binary sequence method is inferior in the characterization of both average and sub-cycle impedance due to the absence of perturbations around the zero-crossings of the recorded line voltage. These results point to the need to carefully evaluate the perturbation techniques for accurate measurement of network impedance.

2021

Pre-normalisation of grid impedance measurement in the power line communication frequency band
Conférence ArODES

Dominique Roggo, Jonathan Braun, Jan Meyer, Blaise Evéquoz, Cédric Blaser, Robert Stiegler, Igor Fernandez

Proceedings of CIRED 2021 - The 26th International Conference and Exhibition on Electricity Distribution, 20-23 September 2021, Online Conference

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Résumé:

Power line Frequency and Time dependent Grid Impedance (FTdGI) influences the propagation of the Power Line Communication (PLC) signals and impacts the communication with Smart Meters. The precise measurement of the power line impedance is ill-defined and only possible with a limited number of instruments. This paper presents the results of the Z-NET project aiming to establish a metrological traceable grid impedance standard that enables the objective comparison of the proposed measuring techniques. A Static Impedance Reference (SIR) was defined, built, and characterized. Comparative results of measurements with five different impedance analysers are presented.

2020

Energetic simulation of DC railway micro-grid interconnecting with PV solar panels, EV charger infrastructures and electrical railway network
Conférence ArODES

Julien Pouget, Baoling Guo, Luc Bossoney, Julien Coppex, Dominique Roggo, Christoph Ellert

Proceedings of 2020 IEEE Vehicle Power and Propulsion Conference (VPPC), 18 November-16 December 2020, Gijon, Spain

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Résumé:

This work tends to exploit the existing DC infrastructures to integrate the photovoltaic solar panels and Electrical Vehicles (EVs) charger infrastructures along with public transportation lines (tramways and trolleys). Moreover, the braking energy of tramway is recovered to charge the EVs nearby. An energetic simulation model of the urban DC railway micro-grid is established by using the Energetic Macroscopic Representation. The energy management strategy is formulated by defining three operation modes. Different types of average dynamic models are studied and compared in respect to the energy management study. The critical simulation results are provided and analysed in order to verify the controls and the management strategy.

2018

Comparison of measurement methods of grid impedance for narrow band-PLC up to 500 kHz
Conférence ArODES

Lino Capponi, Igor Fernández, Dominique Roggo, Amaia Arrinda, Itziar Angulo, David De La Vega

Proceedings of 2018 IEEE 9th International Workshop on Applied Measurements for Power Systems (AMPS), 26-28 September 2018, Bologna, Italy

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Résumé:

Impedance measurement methods and field measurements are being demanded by utilities and regulatory and standardization bodies, in order to characterize the electrical grid as a data transmission medium. The variation with time and frequency of both the grid access impedance and the load impedance of connected devices has a great influence on the performance of the Power Line Communications (PLC) for Smart Grid applications. This paper presents two different methods to characterize the grid and load impedances for the frequency range used for NB-PLC. One method is based on current injection and Synchronous Demodulation, while the second method is based on the injection of configurable NB-PLC signals and Fourier analysis. Results are compared and evaluated with respect to theoretical calculations, when they are applied to a typical impedance scenario. Moreover, the impact of the variations of the access impedance on the NB-PLC signals is also evaluated, by characterizing both the frequency response of the filter impedance and the effect on the signals spectra.

2017

Modular ICT based energy management system for a LVDC-microgrid with local PV production and integrated electrochemical storage
Conférence ArODES

Christoph Ellert, Rodolfo Horta, Thomas Sterren, Dominique Gabioud, Dominique Roggo, Pierre-Olivier Moix

Proceedings of 2017 IEEE Second International Conference on DC Microgrids (ICDCM), 27-29 June 2017, Nuremburg, Germany

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Résumé:

The HES-SO Valais has installed a PV-generator, where each PV-module is individually linked to the 700V DC-bus power line via an individual DC/DC voltage converter with integrated maximum power point tracker. A battery storage system is connected to the DC-bus for local energy storage. The polar +/-350 V DC bus voltage is controlled by an AC/DC converter interfacing the system to the low voltage AC grid. The entire system is presently extended to a microgrid (see figure1) with multiple functionalities like local consumers commonly used on industrial sites and an electrolysis system. The PV plant is optimized by individual PV microconverters (with MPPTs) and will be extended to integrate strings of several modules with up to 1000 Vdc. Both integrated Li-Ion and Pb battery storage systems are controlled through bi-directional commercially available DC/DC converters (modified version). In order to achieve full monitoring, supervision and energy management capability a modular ICT system interconnecting the microgrid power components, a SCADA system and an Energy Management System (EMS) have been designed. A program (target power exchange profile) for the power exchange between the microgrid and the distribution grid will be established 48 hours ahead of time. The EMS orchestrates the flexible microgrid components so that the program can be followed with a deviation of less than 1 %.

Electromagnetic interferences in smart grid applications :
Conférence ArODES
a case study with PLC smart meters and PV energy generation

Dominique Roggo, Rodolfo Horta, Lino Capponi, Loïc Eggenschwiler, Fabrice Decorvet, Cédric Pellodi, Franz Buholzer

Proceedings of the 24th International Conference on Electricity Distribution, 12-15 June 2017, Glasgow, UK

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Résumé:

Measurements on a LV distribution grid section equipped with smart meters have shown that photovoltaic energy production has an impact on power line communication systems. An interferences analysis method based on simulations with frequency scans of equivalent circuit models of the LV grid section, including active infeed converters, mains communicating systems and loads is presented. The proposed method is described and evaluated with simulations and measurements realised on a simple laboratory setup.

2016

DC bus based microgrid for buildings applications
Conférence ArODES

Rodolfo Horta, Dominique Roggo, Christoph Ellert

Proceedings of CIRED Workshop, 14-15 June 2016, Helsinki, Finland

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Résumé:

The project DC-bus for microgrid at HES-SO ValaisWallis 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 with MPPT for individual PV panels and the bidirectional AC/DC interface to the LV AC distribution grid. A model of the controller in the frequency domain of the AC/DC inverter has been used to optimise the control coefficients, with focus on both DC bus stability and reduction of the current harmonics on the AC grid side. Realisation, a simulation model and tests results are presented.

2015

Inverter to grid :
Conférence ArODES
voltage control strategies for grid integration of distributed energy resources

Dominique Roggo, Pierre-Olivier Moix, Dominique Gabioud

Proceedings of the 23rd International Conference on Electricity Distribution (CIRED), 15-18 June 2015, Lyon, France

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Résumé:

In the context of renewable energy integration into the distribution grid, this paper proposes introduces the concept of synchronized control of many inverters distributed on a low voltage network. Compared to the standard Volt-VAr control, the synchronized control presents substantial advantages. It can better control voltage on a line and add further services such as reactive power compensation at the district level for minimization of losses. In future microgrids with a generalized communication between components, the synchronized control is possible and is really a feature to consider. The concepts developed during this project have been simulated but also implemented on industrial components in the new GridLab laboratory at the University of applied science of western Switzerland HES-SO Valais.

2013

On-line 2 to 150 kHz grid impedance meter
Conférence ArODES

Dominique Roggo, Lionel Merendaz, Dominic Furrer

Proceedings of 22nd International Conference and Exhibition on Electricity Distribution (CIRED 2013), 10-13 June 2013, Stockholm, Sweden

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Résumé:

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 spectral impedance of a distribution grid section cannot be estimated by calculation, it has to be measured. This paper presents the “on-line” grid impedance meter designed for spectral impedance measurements of low voltage distribution grids over the frequency range between 2 and 150 kHz. A useful application of spectral grid impedance measurement is presented at the end of this paper, with the analysis of interferences between two photovoltaic inverters.

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