摘要
光伏并网系统由于其清洁无污染、便于分布式发电的优点,在我国西北偏远地区以及乡镇配电台区得到广泛应用。然而该系统易受环境温度、光照强度、电网阻抗以及接入非线性负载等外部环境影响,导致输出包含大量高次谐波,入网电能质量明显下降。为解决光伏发电系统接入偏远配电台区存在的谐波问题,此处提出一种融合有源电力滤波器(APF)算法的光伏并网系统协调统一控制策略,建立了光伏并网系统与APF统一控制数学模型,给出了协调统一控制策略框图。最后通过5 kW光伏并网系统实验,验证了所提控制策略可以有效抑制光伏并网系统输出谐波,提升了接入配电台区的电能质量,具有一定的工程实用价值。
Because of the advantages of clean,pollution-free and convenient for distributed generation,photovoltaic grid-connected system has been widely used in remote areas and township distribution stations in northwest China.However,the system is susceptible to environmental temperature,light intensity,grid impedance and nonlinear load,resulting in a large number of high harmonic output,and power quality of the network decreased significantly.In order to solve the harmonic problem of photovoltaic power generation system accessing remote distribution stations,a coordinated and unified control strategy of photovoltaic grid-connected system based on active power filter(APF)algorithm of active power filter is proposed.The mathematical model of unified control of photovoltaic grid-connected system and APF is established,and the block diagram of coordinated unified control strategy is given.Finally,the proposed control strategy which can effectively suppress the output harmonics of photovoltaic grid-connected system,improve the power quality of the distribution stations are verified by the experiment of 5 kW photovoltaic grid-connected system.
作者
张国祥
严兴宇
ZHANG Guo-xiang;YAN Xing-yu(Wuwei Occupational College,Wuwei 733000,,China;不详)
出处
《电力电子技术》
CSCD
北大核心
2021年第11期71-74,共4页
Power Electronics
关键词
有源电力滤波器
光伏并网
谐波
active power filter
photovoltaic grid-connected
harmonic
