Analysis Of The Influence Of Abnormal DC Line Voltage Divider Voltage Measurement On The Control And Protection System

The DC line voltage divider is an important equipment in UHVDC transmission.In recent years,DC unplanned outage events have occurred due to abnormalities in DC line voltage dividers.The DC line voltage divider measurement anomaly has a complicated impact on the DC control protection.At present,it is not possible to quickly locate the DC line voltage divider problem whether it is a rectifier station or an inverter station.At the same time,the abnormal field detection of DC line voltage divider measurement is also quite complicated.At present,there is no method for on-site detection of DC voltage divider.Therefore,it is necessary to carry out in-depth analysis on the influence of DC line voltage divider measurement abnormality on DC control protection,and aim at DC.The line voltage divider measurement anomaly proposes corresponding solutions to provide a reference for solving such problems on site.This paper takes the DC line voltage divider measurement abnormality appearing in Yunguang DC project as the research object,and expounds the primary and secondary structure of the DC line voltage divider.Combined with the theoretical analysis,the DC line voltage divider measurement is abnormally high or low to DC control.The protection effect is also described in detail for the DC line voltage divider abnormal event processing process and the problem found in the cloud wide UHVDC project.The detection method and detection method of the DC line voltage divider abnormality and the DC operation are proposed.In the maintenance,DC line divider measurement abnormal site pre-control measures occurred.This paper analyzes the logic theory of DC control protection software,and combines the actual DC line voltage measurement abnormal event processing process,summarizes various types of DC line voltage divider measurement abnormal treatment scheme,and proposes the voltage measurement abnormality of DC line voltage divider.The modification scheme of the control and protection software for the abnormality of the DC line voltage divider of the Yunguang UHV DC project is improved.The modification scheme can well locate the position where the DC line divider measures the abnormality and improve the processing efficiency of the voltage anomaly.Through the analysis on the abnormality of DC line voltage divider measurement,let us have a good understanding of the mechanism of abnormality measurement of DC line voltage divider,and the reasons for measuring the influence of abnormality on DC control protection,and can quickly process and locate DC line voltage division.The device measures abnormalities and improves the UHVDC energy availability.