考虑瞬时无功功率的分布式光伏并网谐波检测方法  

Harmonic Detection Method for Photovoltaic-integrated Grid Considering Instantaneous Reactive Power

作　　者：王迪生 祁艳君 WANG Disheng;QI Yanjun(CHN Energy Qinhuangdao Power Plant,Qinhuangdao 066003,China)

机构地区：[1]国家能源集团秦皇岛电厂,河北秦皇岛066003

出　　处：《电工技术》2024年第2期83-86,136,共5页Electric Engineering

摘　　要：为了提高分布式光伏并网后电力系统的谐波检测效果,保证分布式光伏并网电力系统稳定运行,提出考虑瞬时无功功率的分布式光伏并网谐波检测方法。分析并网型光伏发电站电源分布式结构,采集分布式光伏并网后的基波和谐波信号;基于广义S变换提取谐波频率分量幅值和时间之间的联系,以获取其信号特征;引用瞬时无功功率理论,通过经验模态分解完成谐波信号检测。测试结果表明,该方法可有效重构信号,提取信号特征,并能准确完成谐波检测,从而抑制谐波,增强电力系统运行稳定性。Aiming at improving harmonic detection effect and ensuring stable operation of electric system integrated with distributed photovoltaic,the present study focused on harmonic detection method considering instantaneous reactive power.The signals of fundamental and harmonic waves of PV-integrated system were collected on the basis of analyzing distributed structure of power sources in grid-connected photovoltaic generations.The method can thereby obtain harmonic signal characteristics by extracting relationship between harmonic frequency component amplitude and time via generalized S-transform,and can perform harmonic signal detection through empirical mode decomposition under the theory of instantaneous reactive power.The proposed method was indicated by test results effective in reconstructing signal and extracting signal features,accurate in detecting harmonics,and thereby facilitative in suppressing harmonics and increasing operation stability of PV-integrated systems.

关 键 词：瞬时无功功率 光伏并网 谐波检测 

分 类 号：TM931[电气工程—电力电子与电力传动]