基于感应滤波的光伏电站谐波谐振抑制方法  

Harmonic Resonance Damping Method of Photovoltaic Power Station Based on Inductive Filtering

作　　者：李勇[1] 刘珮瑶 胡斯佳 林锦杰 罗隆福[1] Li Yong;Liu Peiyao;Hu Sijia;Lin Jinjie;Luo Longfu(College of Electrical and Information Engineering Hunan University ,Changsha 410082 China)

机构地区：[1]湖南大学电气与信息工程学院,长沙410082

出　　处：《电工技术学报》2022年第15期3781-3793,共13页Transactions of China Electrotechnical Society

基　　金：国家重点研发计划政府间国际科技创新合作重点项目(2018YFE0125300);国家自然科学基金项目(51822702);湖湘高层次人才聚集工程项目(2019RS1016);长沙市杰出创新青年计划(KQ2009037);中央高校基本科研业务费(531118010661)资助。

摘　　要：光伏电站中大量光伏逆变器同时工作于“弱网络”条件下易与电网间产生谐波谐振,威胁电站的供电持续性和运行安全。该文围绕一个真实光伏电站,考虑上级电网阻抗的变化,建立了传统光伏电站的谐波域等效模型,对其谐振问题进行了分析。在此基础上,针对在光伏电站真实出现的谐波谐振,提出一种基于感应滤波的光伏电站谐波谐振抑制方法,详细分析了其谐波域模型和谐振抑制机理。该方法中感应滤波变压器的滤波绕组采用特殊的零阻抗设计,外接全调谐无源滤波器能获得比较优良的谐波滤除能力,与此同时,因为它还改变了光伏电站整体网络的阻抗频率特性,故能有效消除真实光伏电站联网运行时的谐波谐振。最后,通过系统仿真和大型工程应用的实测数据验证了该方法在光伏电站谐波谐振治理中的优良特性。In photovoltaic(PV) power stations, a large number of photovoltaic inverters working under the “weak network” are more likely to motivate harmonic resonance with the power grid, which threatens the power supply continuity and operation safety of the power station. In this paper, based on a real PV substation, the harmonic equivalent model of the traditional PV power station is established which considers the variation of the network impedance of the upstream of the grid, and the resonance is analyzed. On this basis, considering the real harmonic resonance in the traditional PV power station,this paper proposes a harmonic resonance damping method of PV power station based on inductive filtering. The harmonic model and resonance suppression mechanism are analyzed in detail. In this method, the filtering winding of the inductive filtering transformer(IFT) adopts a special zero impedance design, which is externally connected with a fully tuned passive filter(PF). It can obtain better harmonic filtering ability. At the same time, it can effectively eliminate the harmonic resonance of PV power station in the traditional PV power station by changing the impedance frequency characteristics of the whole network of PV power station. Finally, through the simulation and the measured data of the large engineering application, the excellent characteristics of the new method is verified.

关 键 词：光伏电站 等效模型 感应滤波 谐振抑制 

分 类 号：TM712[电气工程—电力系统及自动化]