The application of HVDC has become more widely .However, the study of power quality events in HVDC lags far behind .By analyzing several years of fault data of power system recorded at Gezhouba , Jiangling and Longquan substations in Hubei province , the power quality disturbances happened there are classified and the mecha-nisms are studied .And the typical parameters have been detected from DC power quality disturbances , which provide reference for study of mathematical modeling .%直流输电的应用越来越广泛，但直流输电的电能质量问题研究相对滞后。通过对湖北省内葛洲坝、江陵和龙泉换流站多年的故障录波数据进行分析，对直流系统中的电能质量进行了分类，介绍了引起不同电能质量事件的机制。并提取了直流电能质量问题的典型参数，为相关研究的数学建模提供了依据。
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