变电站直流混用的在线辨识方法研究

On-line Identification Method of DC Hybrid in Substation

采用基于漏电电流检测法和低频信号注入法来实现对各种直流互联或混用情况的在线辨识。当互联电阻较小、能够满足漏电电流传感器检测时,根据漏电电流检测法实时辨识出直流互联支路,然后检查当前接入、改接了哪些二次电缆,极大地缩小了检查范围。当互联电阻较大,则需要采用基于低频信号注入法来实现在线辨识同极互联或不同极互联。

This paper proposes the on-line identification method based on leakage current detection and low-frequency signal injection for various DC interconnections or mixed-use situations.When the interconnection resistance is small,which can meet the leakage current sensor detection,the DC interconnection branch can be on-line identified in leakage current detection method,and then check the current changed secondary cables,greatly narrowing the inspection range.When the interconnect resistance is large,it needs to use low-frequency signal injection to achieve on-line identification of the same buses or different buses interconnection.