基于新型VLMZVM的ANPC型三电平并网逆变器环流抑制方法  

CIRCULATION CURRENT SUPPRESSION METHOD OF ANPC-TYPETHREE-LEVEL GRID-TIE INVERTERS BASED ON NEW VLMZVM

作　　者：杨向真[1,2] 刘灿 杜燕 张徐进博[1,2] 张涛[1] 施永[1,2] Yang Xiangzhen;Liu Can;Du Yan;Zhang Xujinbo;Zhang Tao;Shi Yong(School of Electrical Engineering and Automation,Hefei University of Technology,Hefei 230009,China;Research Center for Photovoltaic Systems Engineering of Ministry of Education,Hefei 230009,China)

机构地区：[1]合肥工业大学电气与自动化工程学院,合肥230009 [2]教育部光伏系统研究工程中心,合肥230009

出　　处：《太阳能学报》2024年第6期272-284,共13页Acta Energiae Solaris Sinica

基　　金：国家重点研发计划(2021YFB2601402)。

摘　　要：为解决广泛应用在大功率分布式发电系统中的多机有源中点钳位(ANPC)型三电平并网逆变器间的低频零序环流问题,提出一种基于虚拟大矢量的新型十三矢量调制(VLMZVM)策略。通过建立多机ANPC型三电平并网逆变器零序环流模型,分析零序环流产生机理和影响因素,通过检测零序环流状态,实时选择虚拟大矢量或实际大矢量合成方法来抑制零序环流,并提出区分奇偶扇区的矢量分配方法快速选择合成矢量。实验结果验证了新型VLMZVM策略能在电流突变、参数不一致、全功率因数范围都具有很好的环流抑制效果。In order to solve the problem of low-frequency zero-sequence circulation current in multi-machine active neutral point clamped(ANPC)three-level grid-tie DC to AC inverters widely used in high-power distributed power generation systems,a new virtual large medium zero vectors modulation(VLMZVM)strategy based on virtual large vectors is proposed.By establishing the zero-sequence circulation current model of multi machine ANPC three-level grid-tie inverters,the generation mechanism and influencing factors of zero-sequence circulation current are analyzed.By detecting the status of zero-sequence circulation current,the virtual large vector or actual large vector synthesis method is selected in real time to suppress the zero-sequence circulation current,and the vector distribution method for distinguishing odd and even sectors is proposed to quickly select the synthesis vector.The experimental results show that the new VLMZVM strategy can effectively suppress the circulation current in the current mutation,parameter inconsistency and full power factor range.

关 键 词：逆变器 分布式发电 功率因数 虚拟矢量 环流抑制 调制策略 

分 类 号：TM46[电气工程—电器]