低压配网中光伏发电系统的电能质量分析

当前光伏发电系统在低压配电网中的应用日益增多.由于光伏系统本身的非线性特性以及出力的随机性,其并网时出力的波动必然会影响电网的电能质量.本文通过建立一个低压配网中的光伏发电模型,研究其并网时所产生的主要电能质量问题.考虑当光伏发电系统采用基于最大功率跟踪（MPPT）的有功无功解耦（PQ）控制方式时,在外部光照强度发生波动的影响下,观察光伏发电系统并网输出功率、电压及电流的波动,分析对低压配网照成的电能质量问题.通过仿真发现,在外部光照发生剧烈变化时,输出波动较大,光伏系统会向电网注入大量谐波,对电网的电能质量产生较大影响.

Analysis on the Harmonics of Photovoltaic System on Low Voltage Distribution

Abstract： With the development of the photovoltaic system on the low voltage distribution, the need to research the contribution of the system is becoming an up to date issue. Since the components are nonlinear and the output power is random, the fluctuation of power will have an influence on the power quality. This paper investigates the influence factors of the power quality on the low voltage distribute with the simulation of the model controlled by MPPT AND PQ. Tests show that the photovoltaic system would inject harmonic current in Dower lina whi~,h h,~o ,~ ,~,,~i~, ~~~~ ~, ,t~ ,_..