【摘要】 电压暂降是最严重的电能质量问题之一,补偿电压暂降能够带来巨大的经济效益,而实现电压暂降特征量的快速、准确检测是电压暂降补偿的前提。本文对现有的电压暂降特征量检测方法进行了全面的研究后,提出一种改进的电压暂降检测方法。该方法利用求导来代替αβ变换方法中的相位延迟算法,不但克服了αβ变换方法中相位延迟算法所造成的短时扰动现象,提高了检测精度,而且还明显加快了检测速度,提高了算法的实时性,从而实现了电压暂降特征量的快速、准确检测。仿真结果证明了该方法的有效性,有望用于DVR补偿装置。更多还原

【Abstract】 With wide use of sensitive electronic equipment, voltage sag has become one of the most serious problems of power quality,which has attracted extensive attentions of scholars and engineers in the power field both native and abroad, because voltage sag compensation can bring about great economic benefit. To compensate voltage sag, fast and exact detection of voltage sag characteristics (sag amplitude, time duration and angle jump) is very important. At the basis of studying present voltage sag detection methods, this paper proposes an improved detection method of voltage sag characteristics which uses differential coefficient instead of phase delay that is employed in αβ transform method for the voltage sag detection. The improved method presented in this paper enhances the detection accuracy and speed which is very useful for DVR compensation device. The simulation results verify the validity of the method.更多还原