Adjustable concentric towers to vary tower shadow effect on flicker in wind turbine
01 Aug 2017-
TL;DR: In this article, the authors developed a facility to find the impact of tower shadow effect on voltage flicker initiated in the wind turbine output, where a tubular tower is formed using pipes.
Abstract: In this paper the facility to find the impact of tower shadow effect on voltage flicker initiated in the wind turbine output is developed. Concentric towers are developed using steel any suitable material pipe. The length of the pipe can be adjusted using sliding the pipe. Nut and bolts are used to fix the length of the pipe. There is a provision to fix the turbine on the tower. Tubular tower are formed using pipes. Pipes with different diameters are provided in the test set up. As length and height of the towers is varied the tower shadow effect is also varied. Artificial wind is created using blower fans. The impact of tower shadow effect on the voltage flicker output of the wind turbine is observed on digital storage oscilloscope. There is a provision to fix various types of generators on the towers. The experiment is conducted on the wind turbine scaled down models. The result can be scaled to the actual dimensions of the wind tower.
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Book•
12 Dec 2014
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550 citations
Book•
07 Apr 2000
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385 citations
TL;DR: In this article, a simulation model of a MW-level variable speed wind turbine with a doubly fed induction generator was developed in the simulation tool of PSCAD/EMTDC.
Abstract: Grid connected wind turbines may produce flicker during continuous operation. This paper presents a simulation model of a MW-level variable speed wind turbine with a doubly fed induction generator developed in the simulation tool of PSCAD/EMTDC. Flicker emission of variable speed wind turbines with doubly fed induction generators is investigated during continuous operation, and the dependence of flicker emission on mean wind speed, wind turbulence intensity, short circuit capacity of grid and grid impedance angle are analyzed. A comparison is done with the fixed speed wind turbine, which leads to a conclusion that the factors mentioned above have different influences on flicker emission compared with that in the case of the fixed speed wind turbine. Flicker mitigation is realized by output reactive power control of the variable speed wind turbine with doubly fed induction generator. Simulation results show the wind turbine output reactive power control provides an effective means for flicker mitigation regardless of mean wind speed, turbulence intensity and short circuit capacity ratio.
252 citations
TL;DR: In this article, an analysis and the modeling of the flicker emission of wind turbines is presented, where the theoretical aspects of flicker algorithm, wind turbine characteristics, and the generation of wind turbine flicker during continuous operation are discussed.
Abstract: This paper presents an analysis and the modeling of the flicker emission of wind turbines. Measurements compared with international standards are discussed. The paper concentrates on the theoretical aspects of the flicker algorithm, wind turbine characteristics, and the generation of flicker during continuous operation of wind turbines.
197 citations
TL;DR: In this article, a frequency domain method to study flicker propagation is presented, which is based on propagation of frequency components from WECS output currents throughout the grid, and an algorithm for flicker measurement in the frequency domain, which allows Pst calculation is proposed.
Abstract: Wind energy conversion systems (WECS) produce fluctuating output power, which may cause voltage fluctuations and flicker. Flicker assessment in networks may be difficult since its evaluation requires long computing time and special procedures to calculate the flicker severity index, Pst. In this paper, a frequency domain method to study flicker propagation is presented. This method is based on propagation of frequency components from WECS output currents throughout the grid. In this way, a fast flicker analysis in a network of any size can be performed. Also, an algorithm for flicker measurement in the frequency domain, which allows Pst calculation, is proposed. Several study cases have been performed, and results have been compared with time domain simulations, showing good agreement between them.
89 citations