Nils Soltau and Marco Stieneker visit the EPE '14 ECCE Europe in Lappeenranta and presenting their papers
Nils Soltau, Julian Lange, Marco Stieneker, Hanno Stagge and Rik W. De Doncker - „Ensuring Soft-Switching Operation of a Three-Phase Dual-Active Bridge DC-DC Converter applying an Auxiliary Resonant-Commutated Pole”
An auxiliary resonant-commutated pole (ARCP) ensures soft switching in the entire operation range of a three-phase dual-active bridge dc-dc converter. This work evaluates the design and the resulting boost in system efficiency for different semiconductor materials and devices. Afterwards, a full-scale medium voltage prototype of an ARCP is constructed. The subsequent measurements are presented within this work, before the economic feasibility is discussed.
Marco Stieneker, Nurhan Rizqy Averous, Nils Soltau, Hanno Stagge and Rik W. De Doncker – “Analysis of Wind Turbines Connected to Medium-Voltage DC Grids”
The transmission and distribution of electrical energy with direct current (dc) is a promising alternative to established alternating-current (ac) systems. Higher efficiencies, fewer lossy pulse-width modulated converters and smaller transformers reduce operation and investment costs. Moreover, dc collector grids within wind parks leads to benefits for harvesting electrical energy. In this paper, a modular dual-active bridge (DAB) dc-dc converter system for integrating renewable energy sources, especially wind turbines (WT), into medium-voltage dc (MVDC) grids is presented and analyzed. Also, the design and efficiency of the machine-side power converter of the WT for dc grids are discussed.
Marco Stieneker, Jan Riedel, Nils Soltau, Hanno Stagge and Rik W. De Doncker – “Design of Series-Connected Dual-Active Bridges for Integration of Wind Park Cluster into MVDC Grids”
The transmission of electrical energy with direct current (dc) is a promising alternative to alternating current (ac) systems. The collection of energy with medium-voltage dc (MVDC) grids also increases the efficiency. In this paper, a dual-active bridge (DAB) dc-dc converter system for integrating wind turbines (WT) into MVDC grids is presented. Within this approach, the secondary-side bridges are series connected whereas the primary-side bridges are not connected with each other. This provides galvanic isolation between the WT.