{"product_id":"control-of-a-wind-driven-doubly-fed-induction-generator-during-grid-faults-von-mahmoud-mossa","title":"Control of a Wind Driven Doubly Fed Induction Generator During Grid Faults","description":"\u003cp\u003eMaster's Thesis from the year 2013 in the subject Engineering - Power Engineering, grade: none, , course: Electrical engineering (Renewable energy), language: English, abstract: Wind electrical power systems are recently getting lot of attention, because\u003c\/p\u003e\u003cp\u003ethey are cost competitive, environmental clean and safe renewable power\u003c\/p\u003e\u003cp\u003esource, as compared with fossil fuel and nuclear power generation. A special\u003c\/p\u003e\u003cp\u003etype of induction generator, called a doubly fed induction generator (DFIG),\u003c\/p\u003e\u003cp\u003eis used extensively for high-power wind applications. They are used more\u003c\/p\u003e\u003cp\u003eand more in wind turbine applications due to ease controllability, high\u003c\/p\u003e\u003cp\u003eenergy efficiency and improved power quality.\u003c\/p\u003e\u003cp\u003eThis thesis aims to develop a method of a field orientation scheme for\u003c\/p\u003e\u003cp\u003econtrol both the active and reactive powers of a DFIG driven by a wind\u003c\/p\u003e\u003cp\u003eturbine.The proposed control system consists of a wind turbine that drives a\u003c\/p\u003e\u003cp\u003eDFIG connected to the utility grid through AC-DC-AC link. The main\u003c\/p\u003e\u003cp\u003econtrol objective is to regulate the dc link voltage for operation at maximum\u003c\/p\u003e\u003cp\u003eavailable wind power.This is achieved by controlling the and axes\u003c\/p\u003e\u003cp\u003ecomponents of voltages and currents for both rotor side and line side\u003c\/p\u003e\u003cp\u003econverters using PI controllers. The complete dynamic model of the\u003c\/p\u003e\u003cp\u003eproposed system is described in detail. Computer simulations have been\u003c\/p\u003e\u003cp\u003ecarried out in order to validate the effectiveness of the proposed system\u003c\/p\u003e\u003cp\u003eduring the variation of wind speed. The results prove that , better overall\u003c\/p\u003e\u003cp\u003eperformances are achieved, quick recover from wind speed disturbances in\u003c\/p\u003e\u003cp\u003eaddition to good tracking ability.\u003c\/p\u003e\u003cp\u003eGenerally, any abnormalities associated with grid asymmetrical faults are\u003c\/p\u003e\u003cp\u003egoing to affect the system performance considerably. During grid faults,\u003c\/p\u003e\u003cp\u003eunbalanced currents cause negative effects like overheating problems and\u003c\/p\u003e\u003cp\u003emechanical stress due to high torque pulsations that can damage the rotor shaft, gearbox or blade assembly. Therefore, the dynamic model of the\u003c\/p\u003e\u003cp\u003eDFIG, driven by a wind turbine during grid faults has been analyzed and\u003c\/p\u003e\u003cp\u003edeveloped using the method of symmetrical components. The dynamic\u003c\/p\u003e\u003cp\u003eperformance of the DFIG during unbalanced grid conditions is analyzed and\u003c\/p\u003e\u003cp\u003edescribed in detail using digital simulations.\u003c\/p\u003e\u003cp\u003eA novel fault ride-through (FRT) capability is proposed (i.e. the ability of\u003c\/p\u003e\u003cp\u003ethe power system to remain connected to the grid during faults) with suitable\u003c\/p\u003e\u003cp\u003econtrol strategy in this thesis. In this scheme, the input mechanical energy of\u003c\/p\u003e\u003cp\u003ethe wind turbine during grid faults is stored and utilized at the moment of\u003c\/p\u003e\u003cp\u003efault clearance, instead of being dissipated in the resistors of the crowbar\u003c\/p\u003e\u003cp\u003ecircuit as in the existing FRT schemes. [...]\u003c\/p\u003e\u003cdiv class=\"aw-variant-hidden-subtitle-div\" id=\"aw-variant-subtitle-9783656368380\"\u003e\u003ch3\u003e\u003c\/h3\u003e\u003c\/div\u003e","brand":"Libri","offers":[{"title":"Softcover - 9783656368380","offer_id":39433343041629,"sku":"9783656368380","price":54.99,"currency_code":"EUR","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0940\/0622\/files\/4ef3fa7c-84a6-44e0-ac21-609765eac48f.jpg?v=1777959526","url":"https:\/\/shop.autorenwelt.de\/products\/control-of-a-wind-driven-doubly-fed-induction-generator-during-grid-faults-von-mahmoud-mossa","provider":"Autorenwelt Shop","version":"1.0","type":"link"}