电工技术学报2018，Vol.33Issue(1)：38-47,10.DOI:10.19595/j.cnki.1000-6753.tces.161522
直驱式永磁同步海流机叶轮不平衡的故障检测
Blade Imbalance Fault Detection Method for Direct-Driven Marine Current Turbine with Permanent Magnet Synchronous Generator
摘要
Abstract
To detect the blade imbalance fault for direct-drive permanent magnet synchronous marine current turbine under the condition of wave and turbulence, an imbalance fault characteristics analysis method is proposed based on the frequency of the stator current. The instantaneous frequency of stator current is first estimated by total least squares-estimation of signal parameters via rotation invariant technique (TLS-ESPRIT) to solve the problem that the fault characteristic frequency is buried in the fundamental frequency and noise. Then, the generalized likelihood ratio test (GLRT) method is used to design the imbalanced fault detector in order to select the appropriate monitoring variable. At last, the data normalization method is proposed to solve the problem of various forms for a same imbalance fault caused by variable characteristic frequencies at different flow velocities. Theoretical analysis, simulation and experimental results verify the effectiveness of the proposed method. This method based on the stator current is easy to be realized, which has important practical significance for ensuring the safe and efficient operation of the marine current turbine system and reducing the maintenance cost.关键词
海流发电/直驱式永磁/不平衡故障/瞬时频率/总体最小二乘-旋转矢量不变技术(TLS-ESPRIT)Key words
Marine current generation/direct-driven permanent magnet/imbalance fault/instantaneous frequency/total least squares-estimation of signal parameters via rotation invariant technique (TLS-ESPRIT)分类
信息技术与安全科学引用本文复制引用
张米露,王天真,汤天浩,Yide Wang..直驱式永磁同步海流机叶轮不平衡的故障检测[J].电工技术学报,2018,33(1):38-47,10.基金项目
国家自然科学基金(61673260)和上海市自然科学基金(16ZR1414300)资助项目. （61673260）
