摘要
提出了一种基于超声相控阵与宽带阵列信号处理的油中局部放电定位新方法。首先采用超声相控阵传感器直接检测局放超声宽带信号,并形成阵列模型;然后针对该超声波信号频段为50～300kHz的宽频特性,应用宽带阵列信号处理中的旋转信号子空间(rotational signal subspace,RSS)算法对其进行聚焦处理,通过聚焦矩阵将宽带阵列信号不同频率下的方向矩阵变换到同一中心频率,最大限度地保留原始信号的宽频空域信息,实现宽带信号方位信息的累积;最后应用多重信号分类法(multiple signal classification,MUSIC)与交叉定位原理对聚焦后窄带信号进行波达方向估计与空间定位。实验结果验证了对该定位方法的有效性。
A new method for partial discharge （PD） location in oil is presented based on ultrasonic phased array and wideband array signal processing. Firstly, the wideband ultrasonic signal of PD is measured directly by the ultrasonic phased array sensor and the array signal model is formed. Secondly, according to the frequency characteristic of the ultrasonic signal between 50kHz to 300kHz, the method of rotational signal subspace （RSS） is used to focus processing, which can convert the signal direction matrix under different frequencies to the same center frequency by focusing matrix. RSS can reserve the information maximally to realize the direction information accumulation of wideband signals. Finally estimation and location of the PD source signal＇s direction of arrival （DOA） are realized by means of the multiple signal classification （MUSIC） and crossover locating principle. The method is validated by the results of the experimental research.
出处
《中国电机工程学报》
EI
CSCD
北大核心
2009年第28期13-17,共5页
Proceedings of the CSEE
基金
国家自然科学基金项目(50477040)
长江学者和创新团队发展计划资助项目(IRT0515)~~
关键词
超声相控阵
宽带阵列信号
旋转信号子空间
油中局部放电
定位
ultrasonic phased array
wideband array signal
rotational signal subspace
partial discharge in oil, location
