基于光伏发电的微电网谐波检测方法研究

目前光伏发电是解决环境污染、能源短缺等问题的重要方法之一。光伏发电系统中大量电力电子器件的应用会产生一定量的谐波,进而影响其电能质量。然而光伏发电系统对电能质量的要求较高,因此需要对谐波进行准确检测和分析,提高系统的电能质量。对此,该文基于光伏发电系统,提出了一种改进的希尔伯特-黄变换(HHT)算法,并通过搭建实验平台进行仿真验证。结果表明,该方法能够精确地检测在光伏并网中谐波的含量,使其能够快速实现与大电网同频同相的并网功能。

At present, photovoltaic power generation is one of the important methods to solve environmental pollution and energy shortages. The application of a large number of power electronic devices in photovoltaic power generation systems generates a certain amount of harmonics, which in turn affects the power quality. However, photovoltaic power generation systems have higher requirements for power quality, so it is necessar y to accurately detect and analyze harmonics to improve the power quality of the system. In this paper, based on the photovoltaic power generation system, an improved Hilbert-Huang transform (HHT) algorithm is proposed and verif ied by building an experimental platform. The results show that the method can accurately detect the harmonic content in the photovoltaic grid connection, so that it can quickly realize the grid-connected function with the same frequency in the same frequency as the large power grid.