Abstract
Distributed generators connected to the power system usually produce voltage fluctuations. For wind turbines connected to a grid, large changes in wind speed can cause voltage flicker at the point of common coupling. The measurement of voltage flicker caused only by wind turbines is difficult. The wind turbine under test is usually connected to a medium voltage point, in which other fluctuating loads may produce significant voltage disturbances at the wind turbine terminal where the measurement is made. Although the IEC 61400-21-1 standard specifies a method to evaluate voltage flicker caused by wind turbines, because of the complex algorithm and process of the IEC standard, there is currently a lack of measurement equipment that meets the IEC standard. In addition, some countries that use other voltage flicker standards, such as ΔV10, do not have suitable flicker measurements for wind turbines. Therefore, this study proposes an enhanced version of the IEC 61400-21-1 standard, which integrates the ΔV10 method, so that the proposed measurement system complies with the IEC and ΔV10 standards. In this study, the voltage flicker measurement system is successfully implemented, which can help engineers to predict the voltage flicker by wind turbines and assess whether a region or grid is suitable for installing wind turbines. Therefore, it can provide wind turbine companies with a quick assessment of voltage flicker to comply with the certification process.
Highlights
IntroductionBecause wind energy has no fuel and air pollution problems, in the face of the current climate abnormalities and global warming, wind energy technology has attracted more and more attention from the world [1,2]
Wind energy is a safe, clean, and endless renewable energy source
Renewable energy is receiving more and more attention, and the power quality problems caused by renewable energy are an issue worth investigating
Summary
Because wind energy has no fuel and air pollution problems, in the face of the current climate abnormalities and global warming, wind energy technology has attracted more and more attention from the world [1,2]. Wind power is a sustainable energy, when the wind power generator is merged with or disconnected from the existing electric power system, it will cause voltage fluctuations and short-circuit current in the grid, thereby affecting power quality. The inherently unstable wind speed can cause the wind turbines to produce voltage fluctuations, called voltage flicker [3,4,5,6]. Voltage flicker will cause unstable lighting of lamps, and cause health problems and electronic equipment failure [7]. The flickermeter standard IEC 61000-4-15 was developed by the International
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