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Stability Analysis And Control Of Full Capacity Wind Turbine System Considering Phase Locked Loop

Posted on:2018-07-31Degree:MasterType:Thesis
Country:ChinaCandidate:Z ChenFull Text:PDF
GTID:2382330566450858Subject:Electrical engineering
Abstract/Summary:PDF Full Text Request
Differing from the operational characteristics of traditional hydrogenerators and thermal power units,full capacity wind turbine system is weak in controllability and disturbance immunity but characterized by stochasticity.Therefore,with the increasing penetration of wind power,the characteristic of power system operation and control will be substantial changed.Meanwhile,the security and stability of power system with wind power integration will be seriously threatened.Besides,the energy storage technology could be an effective method to solve this problem due to its fast power response ability and strong stabilizing effect.Therefore,this dissertation will study on the stability analysis and control of full capacity wind turbine system considering phase locked loop.This dissertation firstly introduces the current research status as well as development trend of wind power generation and energy storage technology,respectively.Afterwards,selecting full capacity wind turbine system as research subject,the main safety and stability problems exist in wind power system are summarized,and thereby the research method and main work of this dissertation are proposed.The research focuses on stability analysis and control of full capacity wind turbine system considering the dynamic process of phase locked loop.Main contents and research results are summarized as follows:(1)Based on the existing mathematical model of full capacity wind turbine system,a simulation model of full capacity wind turbine connecting to infinite bus including the dynamic model of phase locked loop is built on the MATLAB/Simulink software.Further analysis on the model to testify the correctness and validity is conduct by the dynamic response of the madel in different operating region when the velocity of wind changing.(2)The small signal stability analysis model of full capacity wind turbine based wind power transmission system,including the dynamic characteristics of phase locked loop,is established.Then,this dissertation analyzes the influences of wind power generation system's various operating conditions,strength of power grid and parameters of phase locked loop on the stability of wind power system.It is indicated that the oscillation in the phase locked loop will cause a 10 Hz power oscillation phenomenon when wind power integrated to the main power grid through long-distance transmission lines.Besides,the weaker the power grid the wind power integrated into is,and the larger the parameters of the phase locked loop are,the power oscillation of the wind power system is more likely to occur.(3)To tackle the power oscillations mentioned above,a kind of damping controller using flywheel energy storage is designed based on the phase compensation theory.It can successfully suppress the power oscillation that occurs in weak power grid to which large scale of wind power is connected through long-distance transmission lines.
Keywords/Search Tags:Wind power generation, Energy storage technology, Phase locked loop, Power oscillation, Damping control
PDF Full Text Request
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