A5010462609- Advanced DC-DC Converters
- Silicon Carbide Semiconductor Technologies
- Multilevel Inverters and Converters
- HVDC Systems and Fault Protection
- Induction Heating and Inverter Technology
- Electric Motor Design and Analysis
- Electromagnetic Compatibility and Noise Suppression
- Advanced Battery Technologies Research
- Lightning and Electromagnetic Phenomena
- Life Cycle Costing Analysis
- Magnetic Properties and Applications
- Internet of Things and Social Network Interactions
- Electric Power Systems and Control
- Engineering Applied Research
- Real-time simulation and control systems
- Wind Turbine Control Systems
Vestas (Denmark)
2020-2024
Institute for Energy Technology
2018-2020
Aalborg University
2016-2018
This paper is introducing a new method of operation for series resonant converter, with intended application in megawatt high-voltage dc wind turbines. Compared to frequency controlled converter operated subresonant mode, the (entitled pulse removal technique) allows design medium transformer highest switching frequency, while being at lower without saturation. The main focus this identify and analyze operating modes technique. With use variable phase displacement promises size reduction...
A new modulation scheme is introduced for a single-phase series-resonant converter, which permits continuous regulation of power from nominal level to zero, in presence variable input and output dc voltage levels. Rearranging the circuit locate resonant LC tank on rectifier side high turns-ratio transformer combined with frequency control phase-shifted inverter keep flux constant down dc, always subresonant or discontinuous conduction mode. This overcomes principal deficit converters,...
This paper presents a design procedure and loss estimation for high-power, medium-voltage series resonant converter (entitled SRC#), intended application in megawatt dc wind turbines. The is operated with novel method of operation, entitled pulse removal technique, characterized by variable frequency phase-shift modulation, below the point LC tank. A step-by-step proposed circuit component ratings efficiency are compared two variants. new operation reduces transformer size to 50%, whereas...
Medium and high frequency, power transformers play an important role in footprint reduction along with their functions of galvanic isolation, voltage transformation all converters typically used traction systems, offshore wind plant converters, solid state transformer based distribution system grids. This art report analysis the various materials design tradeoffs that govern electromagnetic behavior loss mechanisms medium frequency applications. Typical winding core geometries have been...
Four DC/DC converters are analyzed and compared with respects to availability, efficiency, ratings, repair costs power density. Intended application is offshore wind farms MVDC collection. The selected topology a new series resonant converter, which offers 99% efficiency across the entire operational range, but needs components designed for high voltage stress.
This paper presents findings from a comparative study on LCoE (levelized cost of energy) impact various configurations electrical power conversion in on-shore wind turbines. All comparisons are made against baseline configuration, based proprietary models and input data, thus boundary conditions assumptions apply, which do not necessarily translate to other manufacturers turbines solutions. In our analysis, we asked the question: topology converter building block size can offer best...
This paper focuses on the modelling of series resonant converter proposed as a DC/DC for DC wind turbines. The closed-loop control design based discrete time domain technique (named SRC#) operated in continuous-conduction mode (CCM) is investigated. To facilitate dynamic analysis and structure, process includes derivation linearized state-space equations, gain scheduling controller. analytical results system are verified z-domain by comparison circuit simulator response (in PLECS™) to...
This paper is introducing a new method of operation for series resonant converter, with intended application in megawatt high voltage DC wind turbines. Compared to frequency-controlled converter operated sub-resonant mode, the (entitled pulse removal technique) allows transformer design be determined by peak load and maximum switching frequency, while still avoiding over-excitation at reduced excitation frequency. promises size reduction more than 50%, losses are kept below 1% from zero...
The equivalent model of offshore DC power collection network for the harmonic susceptibility study is proposed based on discrete time-domain modelling technique and frequency scan approach in domain. methodology a converter system domain can satisfy studies any configuration wind farm thereby find suitable design components array network. intended to allow collection, regardless choice topology, cable configuration, control design. To facilitate study, includes creating turbine current...
This paper proposes a methodology for characterization of medium voltage (MV), frequency (MF) rectifier diode valve. The intended application is 10MW dc/dc converters used in DC offshore wind turbines. Sensitivity to semiconductor component parameter variation, snubber tolerance, influence temperature and stray capacitance are analyzed. It concluded that the largest impact on sensitivity given by reverse recovery charge variation differences between adjacent devices.
Offshore wind farms using medium voltage DC power collection promise an increase in efficiency and a reduced bill-of-material cost. One of the key components is high power, DC/DC converter located turbines. There are many suggested topologies state art, but they all still at immature technology level, as no substantial experience from full-scale detailed design exists. By employing functional failure mode effects analysis (F-FMEA) with decision making tool (Pugh Matrix), paper presents...