Improvements on the line outage distribution factor for power system security analysis

Abstract This paper presents two sensitivity factors in terms of the generation shift distribution factor (GSDF) to improve some defects of the conventional formula for the line outage distribution factor (ODF). The sensitivity factors are established by using the concepts of generation change and power injection to simulate the outaged line flow and one of them is then applied to the case of line addition. A transfer factor is derived to calculate the power flow of the added line very quickly from the relationship between the ODF and the GSDF. The proposed method has been tested by means of a standard system. Compared with the conventional ODF in the line outage case and with DC load flow in the line addition case, the proposed method has good accuracy and a fast execution time. This method is very suitable for real-time security assessment and contingency analysis of power systems.