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Series-DC connection of Offshore wind generating units - modeling, control and galvanic isolation
- Source :
- Electric Power Systems Research. 195:107149
- Publication Year :
- 2021
- Publisher :
- Elsevier BV, 2021.
-
Abstract
- This work proposes an air-core DC-DC solid state transformer to connect the wind turbines of an offshore wind farm in series with a DC transmission link. This emerging layout does not use a power transformer to increase the voltage from the offshore collector network to the transmission level, nor does it require a rectifier station to convert the electrical energy to DC. The diode-clamped rectifiers, connected to each permanent-magnet generator, are controlled to drain sinusoidal currents from the generators in order to extract the maximum power from the wind turbines. The air-core transformer, designed by means of a finite element software, ensures the galvanic isolation between the wind generator and the HVDC link. From the generator side, a single-phase full-bridge three-level inverter feeds the primary coil of the transformer, whereas the secondary coil is wound using by means of an XLPE-insulated cable. This paper also presents a strategy for designing the controllers that regulate the output voltage of each wind conversion unit. Results from digital simulations, obtained with PSCAD/EMTDC, are presented to validate the technical feasibility of the proposed DC-DC solid-state transformer scheme, as well as to demonstrate its performance under different operational conditions.
- Subjects :
- Wind power
business.industry
Computer science
020209 energy
020208 electrical & electronic engineering
Electrical engineering
Energy Engineering and Power Technology
02 engineering and technology
law.invention
Generator (circuit theory)
Rectifier
Offshore wind power
law
Electromagnetic coil
0202 electrical engineering, electronic engineering, information engineering
Inverter
Electrical and Electronic Engineering
Transformer
business
Galvanic isolation
Subjects
Details
- ISSN :
- 03787796
- Volume :
- 195
- Database :
- OpenAIRE
- Journal :
- Electric Power Systems Research
- Accession number :
- edsair.doi...........c43a8f1d1f6906b2df848ab3b5957b15