机电工程技术Issue(3)：10-16,7.DOI:10.3969/j.issn.1009-9492.2013.03.003
基于小波变换的高压直流输电换相失败控制
Prevention Control of Commutation Faillure in HVDC Based on Wavelet Transform
摘要
Abstract
Commutation failure is the common fault in HVDC systems. If the controller of commutation failure can be designed properly, commutation failure and successive commutation failure can be restrained. The impact of commutation failure on power system is lowered. Wavelet transform is a signal-processing method both in time and frequency. The application of wavelet transform can control commutation failure correctly in real-time. DC voltage and AC voltage in inverter side are the signals analyzed by wavelet. The variances of wavelet coefficient d6 are used to identify the fault. By moving sample windows,the measurement and classification of fault can be done online. When the controller identifies a fault,it can improve the desired value of distinguished angle and improve the margin of commutation. The control strategy prevents the successive commutation failure caused by AC three-phase short circuit fault and commutation failure caused by single-phase short circuit fault and improper control mode. The simulation results show that the controller is with well performance.关键词
高压直流输电/换相失败/小波变换Key words
HVDC system/commutation failure/wavelet transform分类
信息技术与安全科学引用本文复制引用
林凌雪,钟庆,张尧..基于小波变换的高压直流输电换相失败控制[J].机电工程技术,2013,(3):10-16,7.基金项目
华南理工大学自然科学青年基金资助项目(编号:5050390) （编号:5050390）
