三相电网正负序观测器技术  

Positive and Negative Sequence Observer for Three Phase Grid

作　　者：李宗鉴 戴瑜兴[1] 刘红 曾国强[1] 

机构地区：[1]温州大学电气与电子工程系,浙江温州325035 [2]浙江埃菲生能源科技有限公司,浙江温州325011

出　　处：《电子学报》2016年第1期216-221,共6页Acta Electronica Sinica

基　　金：国家自然科学基金(No.51207112);浙江省科技计划项目(No.2014C31074;No.2014C31093)

摘　　要：快速准确地获取电网基波正、负序分量及各次谐波分量,对并网变流器在电网非理想工况下的控制具有重要意义.为此,提出一种能够快速精确的提取电网基波正序、负序及各次谐波分量的正负序观测器技术.采用现代控制理论的状态观测方法,观测器在两相静止坐标系下实现,包含基波和各次谐波子观测器,能区分正、负序信号,可直接提取,无需额外正负序分离,不需要进行实时三角函数运算,易于数字实现.仿真和实验结果表明,文中提出的方法能够在电网不对称与存在谐波干扰的情况下准确提取出基波及各次谐波正负序分量,并且具有良好的动态性能.It is of great significance for the grid-connected converter control to extract the grid fundamental positive,negative sequence component and each harmonic component quickly and accurately under non-ideal conditions. In this regard,a positive and negative sequence observer technology is proposed. Based on the modern control theory methods of status observation,the observer is implemented in two-phase stationary reference frame and includes the fundamental and harmonic sub-observer. It can distinguish positive and negative sequence signal with the same angular frequency. It does not require real-time trigonometric functions and is easy to realize. The effectiveness of the proposed observer is demonstrated by the comparative experimental results which showthe accurate extraction for the fundamental positive,negative components and harmonic components and good dynamic performance under the unbalance and harmonic interference grid.

关 键 词：并网变流器 正负序观测器 谐波提取 两相静止坐标系 

分 类 号：TM71[电气工程—电力系统及自动化]