摘要
功率变流器是发电系统与电网的接口,对其可靠性要求很高。在温度频繁变化的环境影响下,变流器极易发生故障。及时准确诊断变流器故障类型,是故障诊断的关键。该文在分析变流器开路故障模式的基础上,利用改进的加窗短时傅里叶变换获取各模式下故障信息,并进行对比分析,找出了各开路故障模式下的故障频谱特征及规律,为变流器开路故障分类提供了理论依据。
Power converter is the interface between generating system to power grid, which should has high reliability. It failure easily when work -temperature change frequently or influenced by environ- ment. Timely and accurate diagnosis on converter fault types is the key to ensure the normal operation of the system. This paper analysis fault mode of power converter, get the fault information in different mode by using windowed Short - Time Fourier Transformation （STFT） to contrast analysis, and then found out the fault spectrum characteristics and rules of each of them. These work provide theoretical basis for con- verter fault classification.
出处
《工业仪表与自动化装置》
2015年第2期3-6,111,共5页
Industrial Instrumentation & Automation
基金
国家自然基金项目(51267011)
甘肃省自然科学基金项目(1212RJYA022)
关键词
变流器
开路故障模式
电压频谱
故障特征
系统仿真
converter
open - circuit fault mode
voltage spectrum
fault characteristics
system sim-ulation
