Fault Ride Through Control of Doubly-Fed Induction Generators for Wind Power Applications

碩士 === 國立清華大學 === 電機工程學系 === 97 === As the number of wind installations has grown worldwide at unprecedented rates in recent years, the average size of installations has increased due to the advent of larger capacity machine, variable speed technology, and an increasing number of off-shore sites. Th...

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Main Authors: Lin, Yuan-Zheng, 林員正
Other Authors: Chu, Chia-Chi
Format: Others
Language:zh-TW
Published: 2009
Online Access:http://ndltd.ncl.edu.tw/handle/90589258652600080762
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spelling ndltd-TW-097NTHU54420672015-11-13T04:08:49Z http://ndltd.ncl.edu.tw/handle/90589258652600080762 Fault Ride Through Control of Doubly-Fed Induction Generators for Wind Power Applications 雙饋式感應風力發電機組故障不間斷運轉控制策略之研究 Lin, Yuan-Zheng 林員正 碩士 國立清華大學 電機工程學系 97 As the number of wind installations has grown worldwide at unprecedented rates in recent years, the average size of installations has increased due to the advent of larger capacity machine, variable speed technology, and an increasing number of off-shore sites. The raises the concern that widespread tripping of wind generators following disturbances could lead to propagation of transient instabilities and could potentially cause local or system wide blackouts. This has provoked many utilities to adopt fault ride-through (FRT) capability for wind turbines. This thesis will focus on the fault ride-through capability enhancement of conventional doubly-fed induction generators (DFIG), which are widely used in wind power generation. Basic operation principles and control algorithms of DFIGs and the corresponding converter for stability studies will be presented first. Simulation verifications are performed by PSCAD. In this thesis, technical enhancements of the FRT capability are achieved through the following steps: 1.Dynamical mechanisms of the linearized DFIG will be conducted by eigenvalue analysis. It will be shown that the DFIG system under the conventional current control method will become unstable if the grid voltage is sufficiently low. 2.The FRT capability can be enhanced by advanced control algorithms in addition to the conventional current control methods. The most straight forward method is the so-called crowbar protection. The DFIG and its associated converter system have to be protected against severe grid faults with considering proper converters and crowbar switching. Alternatively, the FRT can be achieved by applying the advanced nonlinear control theory, including state feedback linearization and the input-output feedback linearization. In this thesis, the sliding mode control theory is applied for FRT enhancement. Both 5th order and the reduced 3rd order DFIG system will be utilized for sliding controller synthesis. Simulations of one-machine-infinite-bus system and a two-area-four-machine system are performed to verify dynamical characteristics of the proposed sliding control. Performance comparisons among existing FRT enhanced control laws will also be examined through numerical explorations Chu, Chia-Chi 朱家齊 2009 學位論文 ; thesis 128 zh-TW
collection NDLTD
language zh-TW
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description 碩士 === 國立清華大學 === 電機工程學系 === 97 === As the number of wind installations has grown worldwide at unprecedented rates in recent years, the average size of installations has increased due to the advent of larger capacity machine, variable speed technology, and an increasing number of off-shore sites. The raises the concern that widespread tripping of wind generators following disturbances could lead to propagation of transient instabilities and could potentially cause local or system wide blackouts. This has provoked many utilities to adopt fault ride-through (FRT) capability for wind turbines. This thesis will focus on the fault ride-through capability enhancement of conventional doubly-fed induction generators (DFIG), which are widely used in wind power generation. Basic operation principles and control algorithms of DFIGs and the corresponding converter for stability studies will be presented first. Simulation verifications are performed by PSCAD. In this thesis, technical enhancements of the FRT capability are achieved through the following steps: 1.Dynamical mechanisms of the linearized DFIG will be conducted by eigenvalue analysis. It will be shown that the DFIG system under the conventional current control method will become unstable if the grid voltage is sufficiently low. 2.The FRT capability can be enhanced by advanced control algorithms in addition to the conventional current control methods. The most straight forward method is the so-called crowbar protection. The DFIG and its associated converter system have to be protected against severe grid faults with considering proper converters and crowbar switching. Alternatively, the FRT can be achieved by applying the advanced nonlinear control theory, including state feedback linearization and the input-output feedback linearization. In this thesis, the sliding mode control theory is applied for FRT enhancement. Both 5th order and the reduced 3rd order DFIG system will be utilized for sliding controller synthesis. Simulations of one-machine-infinite-bus system and a two-area-four-machine system are performed to verify dynamical characteristics of the proposed sliding control. Performance comparisons among existing FRT enhanced control laws will also be examined through numerical explorations
author2 Chu, Chia-Chi
author_facet Chu, Chia-Chi
Lin, Yuan-Zheng
林員正
author Lin, Yuan-Zheng
林員正
spellingShingle Lin, Yuan-Zheng
林員正
Fault Ride Through Control of Doubly-Fed Induction Generators for Wind Power Applications
author_sort Lin, Yuan-Zheng
title Fault Ride Through Control of Doubly-Fed Induction Generators for Wind Power Applications
title_short Fault Ride Through Control of Doubly-Fed Induction Generators for Wind Power Applications
title_full Fault Ride Through Control of Doubly-Fed Induction Generators for Wind Power Applications
title_fullStr Fault Ride Through Control of Doubly-Fed Induction Generators for Wind Power Applications
title_full_unstemmed Fault Ride Through Control of Doubly-Fed Induction Generators for Wind Power Applications
title_sort fault ride through control of doubly-fed induction generators for wind power applications
publishDate 2009
url http://ndltd.ncl.edu.tw/handle/90589258652600080762
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