By Petersson Andreas

Show description

Read Online or Download Analysis, modeling and control of doubly-fed induction generators for wind turbines PDF

Best analysis books

Differential calculus for beginners (1905)

This scarce antiquarian ebook is a range from Kessinger Publishings Legacy Reprint sequence. as a result of its age, it could possibly include imperfections reminiscent of marks, notations, marginalia and wrong pages. simply because we think this paintings is culturally vital, now we have made it to be had as a part of our dedication to keeping, conserving, and selling the worlds literature.

Characteristic Functions, Scattering Functions and Transfer Functions: The Moshe Livsic Memorial Volume

The notions of move functionality and attribute capabilities proved to be basic within the final fifty years in operator thought and in approach thought. Moshe Livsic performed a critical function in constructing those notions, and the booklet encompasses a number of conscientiously selected refereed papers devoted to his reminiscence.

Miniconference on geometry and partial differential equations 2, Canberra, July 26-27, 1986

This quantity comprises the court cases of a miniconference on geometry and partial differential equations held on the Australian nationwide collage in June 1986, on the Centre for Mathematical research. The lawsuits of an prior such convention were released in quantity 10 of this sequence.

Nostradamus 2014: Prediction, Modeling and Analysis of Complex Systems

The prediction of habit of complicated structures, research and modeling of its constitution is a very important challenge in engineering, economic system and customarily in technology at the present time. Examples of such platforms might be obvious on this planet round us (including bodies) and naturally in nearly each medical self-discipline together with such “exotic” domain names because the earth’s surroundings, turbulent fluids, economics (exchange fee and inventory markets), inhabitants progress, physics (control of plasma), info stream in social networks and its dynamics, chemistry and intricate networks.

Additional info for Analysis, modeling and control of doubly-fed induction generators for wind turbines

Example text

In order to do this, the distribution of wind speeds must be known. As mentioned earlier one commonly used probability density functions to describe the wind speed is the Rayleigh function [53]. 9) 0 where w is the wind speed. 1 Investigation of the Influence of the Converter’s Size on the Energy Production As was mentioned earlier, it is not possible to obtain a full speed range with the DFIG system if the converter is smaller than the rated power of the turbine. This means that the smaller the converter is, the more the WT will operate at a non-ideal tip-speed ratio, λ, for low wind speeds.

In [35], a lower fixed-speed IG WT efficiency was reported than in this study. The reason for this is that the IG in this study has two generators and lower iron losses. 4 Discussion In Fig. 12 it can be seen that the two-generator system (FSIG 2), the DFIG system, and the PMSG system have almost the same efficiency. In [16] it was found that the DFIG system produced 60% more energy compared to a fixed-speed system. However, in this study the produced energy of the systems was found to be similar.

100% correspond to the input turbine power at optimal, with respect to the rotor speed, aerodynamic efficiency. 32 (FSIG 1) has the disadvantage of poor aerodynamic efficiency. However, with the two-speed system (FSIG 2) the aerodynamic efficiency is improved and close to the variable speed systems (VSIG, PMSG and DFIG). In Fig. 12 the produced energy of the different systems, for various average wind speeds, are presented. In the figure, the DFIG is operated with a rotor-speed range set to 12–25 rpm.

Download PDF sample

Rated 4.64 of 5 – based on 47 votes