Operation and Control of Multi-Terminal DC (MTDC) Grids
Author
Bobis Uria, Marta
Term
4. term
Education
Publication year
2013
Submitted on
2013-06-03
Abstract
Europe has strong potential for renewable energy, particularly wind power, which is expanding and calls for new grid architectures. Moving from point-to-point links to multi-terminal DC (MTDC) networks is expected to facilitate cross-border exchange and the integration of offshore wind. VSC-based HVDC is selected as the enabling technology due to lower losses and suitability for long-distance transmission. This thesis aims to develop and assess power-sharing control in an MTDC transmission system under normal operating conditions. The system is modeled in MATLAB/Simulink and includes VSC topologies, filters, DC cables, and DC capacitors, along with controls such as vector control with PLL, voltage and power regulators, and voltage droop. Simulation studies are conducted for three-, four-, and five-terminal MTDC configurations, including variations in controller gains and DC line impedances, to examine how power sharing can be achieved in practice. The excerpt does not provide detailed quantitative findings; the emphasis is on model development and testing of control strategies, with results discussed in later chapters.
Europa har store muligheder for vedvarende energi, især vindkraft, som vokser hurtigt og kræver nye netstrukturer. Overgangen fra punkt-til-punkt-forbindelser til multi-terminal DC (MTDC) net forventes at lette grænseoverskridende udveksling og integrationen af havvind. VSC-baseret HVDC vælges som nøgleteknologi på grund af lavere tab og bedre egnethed til lange afstande. Specialet har til formål at udvikle og vurdere effektdelingskontrol i et MTDC-transmissionssystem under normal drift. Systemet modelleres i MATLAB/Simulink og omfatter VSC-topologier, filtre, DC-kabler og DC-kapacitorer samt kontrol som vektorregulering med PLL, spændings- og effektregulatorer og spændingsdroop. Der gennemføres simulationsstudier for tre-, fire- og fem-terminal MTDC-konfigurationer, herunder variationer i regulatorgevinster og DC-linjeimpedanser, for at undersøge, hvordan effektdeling kan opnås i praksis. Dette uddrag indeholder ikke detaljerede resultater; fokus er på modeludvikling og afprøvning af kontrolstrategier, som behandles nærmere i de efterfølgende kapitler.
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