基于空间矢量的电压暂降检测方法研究
发布时间：2019-05-26 19:16
【摘要】：随着经济发展和工业技术水平的飞速进步,各种非线性和电力变化敏感性负荷在工业生产中大量应用,导致电能质量问题越来越严峻。在诸多的电能质量问题中,电压暂降有着发生频次高和危害程度大等特点,已经成为当今电力工作者最为关注的电能质量问题之一。实时地检测出电压暂降的发生并且准确地提取出电压暂降的特征量,是对电压暂降进行高效治理的前提和关键问题之一,具有非常重要的实际应用意义。本文首先阐述了电能质量和电压暂降的相关概念,分析了现阶段国内外科学工作者针对电压暂降检测问题的研究现状,然后介绍了空间矢量的相关理论,并应用空间矢量对电压暂降进行检测。本文的主要工作如下:(1)研究了一种基于空间矢量的电压暂降检测方法。考虑到应用传统空间矢量方法分析电压暂降特征量时不能解决在电压暂降时伴随的电压相位角跳变的问题,通过对三相电压信号进行Clarke变换构造出三相电压空间矢量,根据空间矢量在复平面上的轨迹形状,判断出电压暂降类型并识别出故障相;通过空间矢量的椭圆参数,通过求解方程组的形式计算出电压相位角跳变值,进而对原始三相电压信号进行移相操作,消除了电压相位角跳变的影响,最终可以快速计算出电压暂降深度。仿真结果表明该方法可以识别出电压暂降的故障类型并且计算出电压相位角跳变值和电压暂降深度。(2)研究了一种改进的基于空间矢量的电压暂降检测方法。应用空间矢量检测电压暂降需要一个完整电压周期的三相电压数据。为了进一步提高检测方法运行速度,结合一种快速椭圆拟合方法,仅使用一个电压周期内的任意三个时刻的三相电压值,即可拟合出三相电压空间矢量在复平面上的轨迹方程,进而可以计算出电压暂降的特征量。实验结果表明该方法能够识别出电压暂降故障类型和计算电压暂降特征量,并且所需数据更少,计算量更小。
[Abstract]:With the development of economy and the rapid progress of industrial technology, a variety of nonlinear and power change sensitive loads are widely used in industrial production, which leads to more and more serious power quality problems. Among many power quality problems, voltage sag has the characteristics of high frequency and great harm, and has become one of the most concerned power quality problems for electric power workers. Detecting the occurrence of voltage sag in real time and accurately extracting the characteristic quantity of voltage sag is one of the prerequisites and key problems for efficient treatment of voltage sag, which has very important practical application significance. In this paper, the related concepts of power quality and voltage sag are described, the research status of voltage sag detection by scientists at home and abroad is analyzed, and then the related theory of space vector is introduced. The space vector is used to detect the voltage sag. The main work of this paper is as follows: (1) A voltage sag detection method based on space vector is studied. Considering that the traditional space vector method can not solve the problem of voltage phase angle jump when the voltage sag characteristic quantity is analyzed, the three-phase voltage space vector is constructed by Clarke transform of the three-phase voltage signal. According to the trajectory shape of space vector on the complex plane, the type of voltage sag is judged and the fault phase is identified. Through the elliptical parameters of the space vector, the voltage phase angle jump value is calculated by solving the equations, and then the phase shift operation of the original three-phase voltage signal is carried out to eliminate the influence of the voltage phase angle jump. Finally, the voltage sag depth can be calculated quickly. The simulation results show that this method can identify the fault type of voltage sag and calculate the voltage phase angle jump value and voltage sag depth. (2) an improved voltage sag detection method based on space vector is studied. The application of space vector to detect voltage sag requires a complete voltage cycle of three-phase voltage data. In order to further improve the running speed of the detection method, combined with a fast elliptical fitting method, the trajectory equation of the three-phase voltage space vector on the complex plane can be fitted by using only the three-phase voltage value at any three times in a voltage period. Furthermore, the characteristic quantity of voltage sag can be calculated. The experimental results show that the method can identify the fault type of voltage sag and calculate the characteristic quantity of voltage sag, and the required data is less and the amount of computation is smaller.
【学位授予单位】：安徽大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TM714.2
本文编号：2485569
[Abstract]:With the development of economy and the rapid progress of industrial technology, a variety of nonlinear and power change sensitive loads are widely used in industrial production, which leads to more and more serious power quality problems. Among many power quality problems, voltage sag has the characteristics of high frequency and great harm, and has become one of the most concerned power quality problems for electric power workers. Detecting the occurrence of voltage sag in real time and accurately extracting the characteristic quantity of voltage sag is one of the prerequisites and key problems for efficient treatment of voltage sag, which has very important practical application significance. In this paper, the related concepts of power quality and voltage sag are described, the research status of voltage sag detection by scientists at home and abroad is analyzed, and then the related theory of space vector is introduced. The space vector is used to detect the voltage sag. The main work of this paper is as follows: (1) A voltage sag detection method based on space vector is studied. Considering that the traditional space vector method can not solve the problem of voltage phase angle jump when the voltage sag characteristic quantity is analyzed, the three-phase voltage space vector is constructed by Clarke transform of the three-phase voltage signal. According to the trajectory shape of space vector on the complex plane, the type of voltage sag is judged and the fault phase is identified. Through the elliptical parameters of the space vector, the voltage phase angle jump value is calculated by solving the equations, and then the phase shift operation of the original three-phase voltage signal is carried out to eliminate the influence of the voltage phase angle jump. Finally, the voltage sag depth can be calculated quickly. The simulation results show that this method can identify the fault type of voltage sag and calculate the voltage phase angle jump value and voltage sag depth. (2) an improved voltage sag detection method based on space vector is studied. The application of space vector to detect voltage sag requires a complete voltage cycle of three-phase voltage data. In order to further improve the running speed of the detection method, combined with a fast elliptical fitting method, the trajectory equation of the three-phase voltage space vector on the complex plane can be fitted by using only the three-phase voltage value at any three times in a voltage period. Furthermore, the characteristic quantity of voltage sag can be calculated. The experimental results show that the method can identify the fault type of voltage sag and calculate the characteristic quantity of voltage sag, and the required data is less and the amount of computation is smaller.
【学位授予单位】：安徽大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TM714.2
【引证文献】
相关硕士学位论文 前2条
1 范帅帅;低频电流比较仪控制系统的研究[D];青岛大学;2018年
2 宁康;含分布式电源配电网的电能质量分析[D];郑州大学;2018年
，本文编号：2485569
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