光伏发电并网中谐波特性分析及谐波抑制综述

Survey of Harmonic Characteristics Analysis and Harmonic Suppression in Photovoltaic Power Grid Connection

高比例光伏并网将导致配电网谐波呈现高频次、宽频域等特性,对电力系统的可靠运行造成严重危害。分析其谐波特性、交互影响和建立谐波源模型是治理谐波、提高电力系统电能质量和保证电网安全稳定的理论基础和技术基础。从谐波特性及交互影响、研究方法原理和谐波抑制三方面出发,对光伏并网中的谐波问题进行综述,总结未来光伏并网谐波问题的发展方向:在交互影响方面,亟需分析光伏并网中谐波源与分布电容的谐波交互影响机理;在机理建模方面,亟需建立动态模型实时反映其谐波变化;在谐波抑制方面,混合型有源滤波器对光伏并网中的谐波治理有一定的借鉴意义。

The high proportion of photovoltaic grid connection will lead to the characteristics of distribution network harmonics in high frequency and broadband domain,which will cause serious harm to the reliable operation of power system.Analyzing its harmonic characteristics,interaction and establishing harmonic source model are the theoretical and technical basis for controlling harmonics,improving power quality of power system and ensuring the safety and stability of power grid.Starting from three aspects of harmonic characteristics and interaction,research methods and principle and harmonic suppression,the harmonic problems in photovoltaic grid connection are reviewed and the future development direction of grid connected photovoltaic system is summarized.In terms of interaction,it is urgent to analyze the mechanism of harmonic interaction between harmonic source and distributed capacitor in photovoltaic grid connection.In the aspect of mechanism modeling,it is urgent to establish a dynamic model to reflect its harmonic changes in real time.In terms of harmonic suppression,hybrid active power filter has a certain reference significance for harmonic control in photovoltaic grid connection.