电力电子系统阻抗测量的分段二叉树法  

Segmented Binary Tree Method for Power Electronic System Impedance Measurement

作　　者：岳小龙[1] 卓放[1] 张政华[1] 师洪涛[1] 张东[1] 

机构地区：[1]西安交通大学电气工程学院,西安710049

出　　处：《电工技术学报》2015年第24期76-83,共8页Transactions of China Electrotechnical Society

基　　金：国家自然科学基金项目(51177130);台达2011电力电子科教发展计划重点项目(DREK2011002)资助

摘　　要：在分析和设计包含电力电子变换器的系统时,由于阻抗和系统稳定性之间的密切关系,阻抗测量就显得十分重要。传统的扫频法采用等频率间隔的方式注入扰动信号并测量电力电子系统阻抗,由于不能在测量结果和测量过程之间建立起有效的联系,因此是一种低准确性、低效率和低可靠性的开环测量方法。通过建立阻抗测量结果准确度和测量频率间隔之间的数学关系,提出了一种分段二叉树阻抗测量方法。使用该方法,可以根据结果的准确度要求自动地确定测量频率点的位置,与传统的扫频法相比,本文提出的方法可以更加准确和有效地测量电力电子系统阻抗。单相交流系统和三相交流系统的阻抗测量结果证明了提出的方法的有效性。Impedance measurement is very important in power electronic based systems because of the close relationship between impedance and stability. However, traditional frequency sweep method always selects the equal frequency interval without guiding theory, which results in low accuracy, low reliability and low efficiency. In this paper, the relationship between measured result and the frequency interval is built firstly, then a segmented binary tree method for power electronic system impedance measurement is proposed. With this method, injection frequency points can be selected automatically according to the requirement of measurement accuracy. Compared to the traditional frequency sweep method, the proposed one can measure impedance more accurately and efficiently. The experimental results validate the effectiveness of the proposed method.

关 键 词：电力电子系统 阻抗测量 频率扫描 二叉树 误差校验 

分 类 号：TM46[电气工程—电器] TM934