Please use this identifier to cite or link to this item:
http://tdr.lib.ntu.edu.tw/jspui/handle/123456789/63221
Title: | 與市電併聯之雙饋式感應風力發電機功率因數控制 Power Factor Control of a Grid-Connected Doubly Fed Induction Generator |
Authors: | Tien-Kei Lu 呂天桂 |
Advisor: | 許源浴(Yuan-Yih Hsu) |
Keyword: | 風力發電,雙饋式感應發電機,最大功率追蹤,損失最小化,電壓調整率,功率因數控制, Wind power generation,doubly fed induction generator,maximum power tracking,loss minimization,voltage variation,power factor control, |
Publication Year : | 2012 |
Degree: | 碩士 |
Abstract: | 本論文針對與特高壓系統併聯之雙饋式感應風力發電機,研究使其能達到最大功率追蹤及損失最小化的運作外,並能同時調整責任分界點的功率因數。
首先,以併聯於特高壓系統之風力雙饋式感應發電機為例,將感應機模型、輸電線模型、自激電容器以及並聯型無效電力補償器考慮進來,使用數值演算法求出在特定功率因數要求下,發電機的電流控制命令及補償器的補償量,使發電機運作在功率因數控制模式。其次,為因應無效電力補償設備過載的情況,推導發電機電流控制命令解析解,用來調整發電機內部無效電力分布,使雙饋式感應發電機系統仍能正常運作在功率因數控制模式。 最後,以併聯於高壓系統之雙饋式感應發電機為特例,在與特高壓系統相同之風機系統架構下,計算使發電機在合理的電壓變動範圍內使發電機損失最小之定子端電壓下的發電機控制電流。此外,經過適當的自激電容值設計,可將使無效電力補償設備所需的容量達到最小。 The main purpose of this thesis is to determine proper control commands for a doubly fed induction generator (DFIG) system, which is grid-connected to extra high-voltage system, in order not only to achieve both maximum power tracking and minimum loss, but adjust the power factor at point of common coupling (PCC) simultaneously. First, a numerical algorithm which takes steady-state DFIG model, transmission line, excitation capacitors and a grid side converter into account is developed. The numerical solutions for rotor currents and compensation capacity of the grid side converter are obtained under certain power factor command, when the DFIG system operates at the power factor control mode. Besides, when the grid side converter is overloaded, another numerical algorithm is developed to solve the solutions for control commands of a DFIG system, such that converter overload is avoided through redistribution of DFIG reactive power. Finally, a search method is applied to find the optimal stator voltage within the eligible voltage variation range which minimizes the DFIG loss when the DFIG system is grid-connected to a high-voltage system. In addition, when the excitation capacitor is properly designed, the reactive power provided by the grid side converter can be minimized. |
URI: | http://tdr.lib.ntu.edu.tw/jspui/handle/123456789/63221 |
Fulltext Rights: | 有償授權 |
Appears in Collections: | 電機工程學系 |
Files in This Item:
File | Size | Format | |
---|---|---|---|
ntu-101-1.pdf Restricted Access | 2.41 MB | Adobe PDF |
Items in DSpace are protected by copyright, with all rights reserved, unless otherwise indicated.