Abstract—This study analyzes Low Frequency Oscillations (LFO) phenomenon of small vertical axis type blades micro hydro turbine power generation system which installed in Shimen Open Channel in Taoyuan, Taiwan. Recent researches presented that the vertical axis wind turbine rotates unstably due to the vertical blades absorbing different fluid forces at different angles. This phenomenon affects the power system DC link voltage occurring low-frequency fluctuations, which significantly impacts the power supply output performance. In the study, small vertical axis blades of micro hydro turbine power generation system also have same problem which affect the voltage floating on the DC link, causing the system voltage unstable and affecting the quality of the output power. In order to suppress the impact of the above phenomenon, this study presents a feed-forward low-frequency feedback control method of suppressing floating voltage on the DC link to improve power quality and reduce the probability of failure. The paper includes a small vertical axis type blades micro hydro turbine power generation system instruction and its low frequency oscillations cause reasons; the establishment of low-frequency feedback feedforward control simulation models; analysis of the effect of suppressing voltage fluctuations. The study conclusions and recommendations can be provided to for further study.
Index Terms—Floating voltage, small vertical axis blades micro-hydro, low frequency oscillations.
Sy-Ruen Huang is with the Department of Electrical Engineering Feng Chia University, Taichung, Taiwan, R.O.C. (e-mail: srhuang@fcu.edu.tw).
Yen-Huai Ma is with the Ph. D. Program of Electrical and Communications Engineering, Feng Chia University, Taichung, Taiwan R.O.C. (e-mail: ahma5653@gamil.com).
Kazuichi Seki is with the Research Institute of Science and Technology, Tokai University, Tokai, Japan (e-mail: l.grigsby@ieee.org).
Wen-Shyong Kuo is with the Department of Aerospace and Systems Engineering, Feng Chia University, Taichung, Taiwan, R.O.C.(e-mail: wskuo@fcu.edu.tw).
Jen-Han Yang is with the Master Program of Electrical Engineering, Feng Chia University, Taichung, Taiwan R.O.C. (e-mail: wertysh1@hotmail.com).
[PDF]
Cite:Sy-Ruen Huang, Yen-Huai Ma, Wen-Shyong Kuo, Kazuichi Seki, and Jen-Han Yang, "Analysis and Suppression of Low Frequency Oscillations in Small Three-Bladed Vertical-Axis Micro-Hydro Turbine," Journal of Clean Energy Technologies vol. 2, no. 4, pp. 363-368, 2014.
