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- Type of Document: Ph.D. Dissertation
- Language: Farsi
- Document No: 39857 (05)
- University: Sharif University of Technology
- Department: Electrical Engineering
- Advisor(s): Oraee, Hashem; Fotuhi Firouzabad, Mahmud
- Abstract:
- Considerable attention has been given in recent years to renewable energy sources due to concerns about dwindling fuel reserves and the potential impact of conventional energy systems on the environment. Wind power is one form of renewable energy resources and also considered as Dispersed Generation (DG). Widespread utilization of wind power imposes many effects on planning and operation of power system. In other side, reliability evaluation and enhancement is an important factor in modern power system planning and operation. So, reliability assessment of wind turbines is of great importance and will receive more attention in the future according to increase of WT utilization. The fundamental task in reliability evaluation of each device is to obtain its reliability model. This model describes different working states of device and the way they relate to each other. For a WT, it is also important to derive its reliability model. Utilizing such reliability model help deriving the reliability model for a wind farm. So, the impact of a collection of such turbines can be precisely assessed. This issue has not been studied before. Most researches in WT concentrated on different impact of environmental and system parameters on WT reliability. Instead, they paid less attention on the WT reliability model itself. Those researches considered simple two or three states reliability models and did not discussed how the model derived. The goal of this thesis is to obtain a reliability model for a wind turbine and application of the model in reliability assessment of WT. the model should shows different operating states of WT and their relation. This requires comprehensive understanding of WT structure and operation. It should be known that how different part participate in WT and how their failures affect the operation of WT. This needs a deep engineering knowledge of systematic relation of WT components. Then a suitable frame work is used to transfer operation states into corresponding mathematical relations. The chronological data of wind turbine performance is required to obtain mathematical parameters of the model. The model is then used in reliability assessment of WT. Failure Modes and Effect Analysis (FMEA) of wind turbine system was conducted for the first time and three different types of wind turbines were compared based on this FMEA. The impact of new generation of future wind turbine generators, BDFG, in reliability improvement was investigated, which shows at least 5 percent improvements in overall wind turbine availability. At last a Reliability Centered Maintenance (RCM) program was derived for wind turbine systems based on the proposed reliability model.
- Keywords:
- Wind Turbine ; Reliability ; Brushless Doubly Fed Machine (BDFM) ; Doubly Fed Induction Generator (DFIG)
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