OPTIMIZATION OF MULTILINK DC TRANSMISSION FOR SUPERGRID FUTURE CONCEPTS
Authors
Sfurtoc, Bogdan ; Rybarski, Tomasz
Term
4. term
Education
Publication year
2012
Submitted on
2012-05-30
Pages
119
Abstract
Efterhånden som mere vedvarende energi produceres i fjerntliggende områder, kræves bedre måder at transportere elektricitet over lange afstande. Traditionelle højspændingsvekselstrømssystemer (HVAC) møder tekniske og økonomiske begrænsninger ved meget lange strækninger. Dette speciale undersøger derfor flerteminal-højspændingsjævnstrømsnet (HVDC) baseret på spændingskildeomformere (VSC). I sådanne net deler flere omformerstationer et fælles jævnstrømslink, så fjern produktion kan kobles til landbaserede elnet og danne grundlag for fremtidige DC-supernet. En central udfordring er at styre stationerne, så de deler den aktive effekt som ønsket; det kræver nye reguleringsstrategier. Specialet analyserer omformerregulering for MTDC-drift (multi-terminal DC) og anvender ingeniørmæssig optimering for at minimere effekttab i driften. Systemet modelleres i PSCAD-simulationsmiljøet, koblet til MATLAB for at implementere optimeringsalgoritmen. Simulationerne valideres i laboratoriet på en nedskaleret 15 kW platform.
As more renewable energy is produced in remote locations, we need better ways to move electricity over long distances. Traditional high-voltage alternating current (HVAC) transmission faces technical and cost limitations over very long spans. This thesis therefore examines multi-terminal high-voltage direct current (HVDC) grids based on voltage-source converters (VSC). In such systems, several converter stations share a common direct-current (DC) link, allowing remote generation to feed onshore grids and laying groundwork for future DC supergrids. A key challenge is coordinating the stations so they share active power as intended; this calls for new control strategies. The thesis analyzes converter control for multi-terminal DC (MTDC) operation and applies engineering optimization to minimize power losses during operation. The system is modeled in the PSCAD simulation environment, linked with MATLAB to implement the optimization algorithm. The simulations are validated in the laboratory on a scaled 15 kW platform.
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Keywords
MTDC ; HVDC ; optimization ; supergrid
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