电网阻抗自适应的混合式孤岛检测方法  

Method of hybrid island detection with adaptive impedance in power grid

作　　者：张成玉 戴海平 黄瑶瑶 蔡慧 李灵至 邹国平 ZHANG Chengyu;DAI Haiping;HUANG Yaoyao;CAI Hui;LI Lingzhi;ZOU Guoping(College of Information Engineering,China Jiliang University,Hangzhou 310018,China;Zhejiang Gaoxin Technology Co.,Ltd.,Hangzhou 311200,China)

机构地区：[1]中国计量大学机电工程学院,浙江杭州310018 [2]浙江高信技术股份有限公司,浙江杭州311200

出　　处：《现代电子技术》2025年第4期151-158,共8页Modern Electronics Technique

基　　金：国家自然科学基金项目(52377017);浙江省教育厅一般科研项目(Y202353705)。

摘　　要：针对并网逆变器存在的孤岛效应,提出一种电网阻抗自适应的混合式孤岛检测方法。首先,采用被动法与主动法结合的混合式孤岛检测方法,基于分布式发电系统进行分析。其中被动法采用电压不平衡法,主动法采用零序电压正反馈法,主动法仅在被动法怀疑发生孤岛时启动,以避免因主动法导致的电能质量下降。其次,采用电压不平衡法,通过理论推导获得被动法设定阈值与电网阻抗的关联式,通过谐波注入法检测电网阻抗,从而有效解决被动法阈值设定困难的问题。最后通过实验验证所提方法的有效性和抗干扰性。实验结果表明,该方法对于不同电网情况以及不同本地负载均能有效检测,对于电网电压波动的情况也具有较强的抗干扰能力。In allusion to the islanding effect of grid connected inverters,a method of hybrid islanding detection with adaptive grid impedance is proposed.A hybrid islanding detection method combining passive and active methods is used for the analysis based on distributed generation systems.The voltage imbalance method is used in the passive method,while the zero sequence voltage positive feedback method is used in the active method.The active method only can be started when the passive method suspects islanding to avoid the power quality degradation caused by the active method.The voltage unbalance method is used to obtain the correlation formula between the threshold set by the passive method and the grid impedance by means of theoretical derivation,and the grid impedance is detected by means of the harmonic injection method,effectively solving the problem of difficulty in setting the threshold by means of the passive method.The effectiveness and anti-interference of the proposed method are verified by experiments.The experimental results show that the proposed method can effectively detect different network conditions and different local loads,and also has strong anti-interference ability to the voltage fluctuation of the network.

关 键 词：并网逆变器 电网阻抗 混合式孤岛检测法 谐波注入法 阈值设定 被动法 主动法 

分 类 号：TN464-34[电子电信—微电子学与固体电子学]