不平衡负载下基于VSG的自适应负序控制策略  

Adaptive Negative Sequence Control Strategy Based on VSG Under Unbalanced Load

作　　者：李圣清[1,2] 李欣 李小宝 刘博文 LI Sheng-qing;LI Xin;LI Xiao-bao;LIU Bo-wen(Hunan University of Technology,Zhuzhou 412007,China)

机构地区：[1]湖南工业大学,电气与信息工程学院,湖南株洲412007 [2]湖南省光伏智能电网控制工程研究中心,湖南株洲412007

出　　处：《电力电子技术》2024年第9期24-27,53,共5页Power Electronics

基　　金：国家自然科学基金(51977072);湖南省教育厅优秀青年项目(18B305)。

摘　　要：逆变器带不平衡负载时,逆变器输出电压不平衡度过大,为此提出一种三相不平衡负载下基于虚拟同步发电机(VSG)的自适应负序控制策略。首先,建立逆变器数学模型,分析输出电压不平衡度过大原因。其次,正序VSG控制正序电压幅值和相角,自适应负序VSG抑制输出电压的负序分量。然后,通过建立VSG小信号模型进行稳定性分析,得出正序和负序VSG的转动惯量和阻尼的取值范围。最后,通过实验结果得出,电压不平衡度降为0.05%,暂态过程电压不平衡度峰值降低到1.8%,说明所提控制策略能有效抑制不平衡负载引起的三相电压不平衡。An adaptive negative sequence control strategy based on virtual synchronous generator(VSG)under three-phase unbalanced load is proposed because the output voltage of the inverter is too unbalanced.Firstly,the mathe-matical model of the inverter is established to analyze the reasons why the output voltage imbalance is too large.Sec-ondly,positive sequence VSG controls the positive sequence voltage amplitude and phase angle to realize load power control,and adaptively negative sequence VSG suppresses the negative sequence component of output voltage.Then,by establishing VSG small signal model for stability analysis,the value range of moment of inertia and damping of posi-tive and negative sequence VSG is obtained.Finally,the experimental results show that the voltage unbalance is re-duced to 0.05%,and the peak value of transient voltage unbalance is reduced to 1.8%,indicating that the proposed control strategy can effectively suppress the three-phase voltage unbalance caused by the unbalanced load.

关 键 词：虚拟同步发电机 不平衡负载 自适应负序控制 

分 类 号：TM31[电气工程—电机]