A FAST METHOD TO EVALUATE ANNUAL ENERGY PRODUCTION OF DIFFERENT OFF-SHORE WIND FARM CONFIGURATIONS CONNECTED TO A VSC-HVDC LINE TRANSMISSION INCLUDING EVALUATION OF A NEW VARIABLE SPEED WIND TURBINE CONCEPT BASED ON RCC-WRIG
Authors
Valderrey Sanchez, Fernando ; Varela Barreras, Jorge
Term
4. term
Education
Publication year
2009
Pages
121
Abstract
Projektet er igangsat efter et forslag fra Vestas Wind Systems A/S. Målet er at udvikle en hurtig metode til at vurdere energiproduktionen fra forskellige vindmøller i en offshore vindmøllepark, der er koblet til en VSC-HVDC (Voltage Source Converter High-Voltage Direct Current) forbindelseslinje. Forslaget omfatter også evaluering af et nyt møllekoncept baseret på en V/f-styret Rotor-Current-Controlled Induction Generator (RCC-IG), hvor spænding og frekvens styres i forhold til hinanden, og rotorstrømmen reguleres. Metoden bygger på forenklede modeller af møller og styringer, som løses analytisk – uden differential- eller integral-led og uden feedbacksløjfer. Producenten har foreslået en to-niveaus, trefaset spændingskildeomformer (Voltage Source Converter) som konvertertopologi. En første version af metoden er implementeret i MATLAB/Simulink og bruges til at evaluere og sammenligne flere konfigurationer i en offshore VSC-HVDC park med 100 turbiner á 2 MW: full scale SPMSG (permanentmagnet-synkrongenerator), DFIG (dobbeltmated induktionsgenerator), RCC-IG og SCIG (kortslutningsbur-induktionsgenerator). Der anvendes aggregerede møllemodeller, og forskellige vindhastighedsfordelinger på tværs af parken indgår. Resultater fra simuleringerne præsenteres og diskuteres. Specifikke resultater kan variere, hvis møllernes egenskaber eller vindfordelingen ændrer sig. Det vigtigste bidrag er derfor udviklingen af en hurtig evalueringsmetode.
This project was initiated by a proposal from Vestas Wind Systems A/S. The goal is to develop a fast method to assess energy production from different wind turbines in an offshore wind farm connected to a VSC-HVDC (Voltage Source Converter High-Voltage Direct Current) transmission link. The work also evaluates a new turbine concept based on a V/f-controlled Rotor-Current-Controlled Induction Generator (RCC-IG), where voltage and frequency are coordinated and the rotor current is regulated. The method relies on simplified models of machines and controls, solved analytically—without derivative or integrator terms and without feedback loops. The converter topology proposed by the manufacturer is a two-level, three-phase Voltage Source Converter. A first implementation in MATLAB/Simulink is used to evaluate and compare several wind farm configurations—full-scale SPMSG (a permanent-magnet synchronous generator), DFIG (doubly-fed induction generator), RCC-IG, and SCIG (squirrel-cage induction generator)—in an offshore VSC-HVDC farm with one hundred 2 MW turbines. Aggregated turbine models are used, and different wind speed distributions across the farm are considered. Simulation results are presented and discussed. Specific outcomes may vary with turbine characteristics or wind distribution, so the main contribution is the development of a fast evaluation method.
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