摘要
电压暂降已被认为是最常见的电能质量问题,快速准确检测电压暂降的典型特征量,是补偿和治理电压暂降的重要前提。提出一种求导αβ-dq变换结合改进形态学滤波的电压暂降实时检测方法,该方法在求导αβ-dq变换的基础上,引入改进形态学滤波,通过改造腐蚀运算和膨胀运算,提高形态学滤波的实时性,并结合微处理器缓存区数据更新过程,简化形态学滤波过程计算量,实现电压暂降实时快速检测。最后,仿真分析与实测数据验证该方法的准确性与实时性,结果表明,所提出的方法能快速精确地检测暂降深度与相位跳变,准确性与实时性皆满足电压暂降实时检测的需求。该方法计算量小,准确性高,适用于电压暂降检测与治理装置,具有实际工程应用价值。
Voltage sag has been considered as the most common power quality problem.Fast and accurate detection of typical characteristics of voltage sag is an important prerequisite for compensation and governance of voltage sag.A real-time voltage sag detection method based on derivativeαβ-dq transformation and improved morphological filter is proposed.Based on the derivativeαβ-dq transformation,the improved morphological filter is introduced.The real-time performance of morphological filtering is improved by modifying the corrosion operation and expansion operation.Combined with the data updating process of microprocessor buffer area,the calculation amount of morphological filtering process is simplified,and the real-time and fast detection of voltage sag is realized.Finally,the accuracy and real-time performance of the proposed method are simulated and verified by the measured data.The results show that the proposed method can detect the sag depth and phase jump quickly and accurately,and the accuracy and real-time performance can meet the requirements of real-time voltage sag detection.The method has the advantages of small calculation,high accuracy,and is suitable for voltage sag detection and treatment devices,and has practical engineering application value.
作者
王灿
黄际元
孟军
宁志毫
左剑
苏婷婷
李波
彭贺翔
WANG Can;HUANG Jiyuan;MENG Jun;NING Zhihao;ZUO Jian;SU Tingting;LI Bo;PENG Hexiang(State Grid Hunan Electric Power Company Limited Research Institute,Changsha Hu’nan 410000,China;State Grid Hunan Electric Power Company Limited Changsha Power Supply Company,Changsha Hu’nan 410015,China;Southwest Jiaotong University,Chengdu Sichaun 611756,China)
出处
《电子器件》
CAS
北大核心
2022年第2期374-380,共7页
Chinese Journal of Electron Devices
关键词
改进形态学滤波
电压暂降
αβ-dq变换
实时检测
improved morphological filtering
voltage sag
αβ-dq transformation
real-time detection method
