分布式光伏发电系统的谐波源机理模型  

Harmonic source mechanism model of distributed photovoltaic power generation system

作　　者：陈少伟 林坤杰 陈碧琳 CHEN Shaowei;LIN Kunjie;CHEN Bilin(State Grid Zhangzhou Power Supply Co.,Ltd.,Zhangzhou Fujian 363000,China)

机构地区：[1]国网福建省漳州供电有限公司,福建漳州363000

出　　处：《浙江电力》2022年第8期57-64,共8页Zhejiang Electric Power

摘　　要：为解决大量分布式光伏接入配电网带来的电能质量问题,基于分布式光伏发电系统的工作原理,分析了双极性SPWM(正弦脉冲宽度调制)控制算法对逆变器谐波特性的影响,以及恒功率控制策略对控制器控制算法的影响。通过分析光伏电源的发电功率与调制信号幅值的机理关系,推导出发电功率与并网谐波电压的函数表达式,建立光伏电源的谐波源机理模型。采用PSCAD搭建光伏电源模型,在发电功率不确定与波动的情况下,测量注入电网的谐波电流和并网的谐波电压,与谐波源机理模型计算的理论值进行比较,验证了谐波源机理模型的合理性。To resolve problems of power quality given rise to by the integration of large-scale distributed photovoltaic power generation,the paper analyzes the influence of bipolar SPWM control algorithm on the harmonic characteristics of inverters as well as the influence of constant power control strategy on control algorithm of controllers.The relationship between mechanisms of the power of the photovoltaic power supply and the amplitude of the modulated signal is analyzed to derive a function expression between power of power generation and post-integration harmonic voltage.Moreover,a harmonic source mechanism model of photovoltaic power generation is established.PSCAD is used to build a photovoltaic power generation model.Under the condition of power uncertainties and fluctuations of power generation,the harmonic current injected into the grid and the harmonic voltage connected to the grid are measured and compared with the theoretical values calculated by the harmonic source mechanism model.The rationality of the harmonic source mechanism model is verified.

关 键 词：电能质量 机理建模 双极性SPWM控制 谐波源 

分 类 号：TM615[电气工程—电力系统及自动化]