REACTIVE POWER CONTROL AND FAULT RIDE THROUGH CAPABILITIES OF SYNCHRONOUS GENERATOR
Authors
Anbarasu, Aravazhi ; Dincan, Catalin Gabriel
Term
4. term
Education
Publication year
2011
Submitted on
2011-05-30
Pages
144
Abstract
Dette speciale undersøger en ny generator-topologi til vindmøller, der kombinerer en trinløs gearkasse (CVT) med en synkron generator, hvor rotorens feltvikling kan styres. Fokus er på to netrelevante egenskaber: kontrol af reaktiv effekt (spændingsstøtte på elnettet) og fault ride-through (at forblive tilsluttet under kortvarige forstyrrelser). Pådrivaren er en induktionsmotor forsynet af en trefaset statisk frekvensomformer (SFC) og styret med feltorienteret styring (FOC). I opstillingen kører generatoren med konstant hastighed, mens momentet varieres, og excitationen leveres via en DC/DC-konverter. Først udvikles analytiske modeller af den synkrone generator (SG) og induktionsmotoren (IM), som verificeres gennem simulation før laboratorieimplementering. Specialet beskriver tilslutning til elnettet og adfærd under transiente fejl. En laboratorieprototype blev opbygget og styret med dSpace, og der blev påført trefasede spændingsfejl. Observationer, resultater og konklusioner fra disse forsøg præsenteres.
This thesis explores a new generator system topology for wind turbines that combines a continuously variable transmission (CVT) gearbox with a synchronous generator whose rotor field winding can be controlled. The focus is on two grid-support features: reactive power control (supporting grid voltage) and fault ride through (remaining connected during short disturbances). The prime mover is an induction motor fed by a three-phase static frequency converter (SFC) and controlled using field-oriented control (FOC). In this setup, the generator runs at constant speed while torque is varied, and the excitation voltage is supplied by a DC/DC converter. Analytical models of the synchronous generator (SG) and induction motor (IM) are developed and verified through simulation before laboratory implementation. The thesis presents principles of operation during grid connection and transient faults. A laboratory prototype was built and controlled with dSpace, and three-phase voltage faults were applied. Observations, results, and conclusions from these tests are presented.
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