电力系统及其自动化学报2018，Vol.30Issue(3)：55-61,97,8.DOI:10.3969/j.issn.1003-8930.2018.03.008
电压源换流器实时故障检测平台实现
Implementation of Real-time Fault Detection Platform for Voltage Source Converter
摘要
Abstract
The AC and DC sides of voltage source converter are vulnerable to external interference,which results in var-ious types of fault.In addition,the transient and steady state information of these faults are not easy to distinguish or identify. At present,most researches in this filed are based on off-line simulation,which is difficult to be combined with real-time detection.To solve this problem,a fault detection platform based on PC+FPGA architecture is proposed in this paper.The high-frequency wavelet coefficients and low-frequency scale coefficients obtained by Mallat decompo-sition are used as criteria to distinguish between the transient and steady states.According to the steady state signal,an improved fast Fourier transform(FFT)algorithm is proposed for harmonic analysis.According to the transient signal, disturbance duration is obtained by using the modulus maximum point,and the modulus maximum value is adopted as a threshold to judge whether a fault occurs.Moreover,high-frequency wavelet coefficients are calculated by wavelet entro-py to judge the fault phase.Experimental results show that the proposed platform can be used to determine the AC and DC faults,and identify fault lines with high accuracy.关键词
实时/故障检测/Mallat算法/小波熵/暂态Key words
real-time/fault detection/Mallat algorithm/wavelet entropy/transient分类
信息技术与安全科学引用本文复制引用
周治国,靳绮颖,张逸,林焱,熊军..电压源换流器实时故障检测平台实现[J].电力系统及其自动化学报,2018,30(3):55-61,97,8.基金项目
国网福建省电力有限公司科技项目"大容量柔性直流输电工程关键技术专题研究-2"(521304150010) （521304150010）
