Input-output Processing Of On-line Contingency Analysis

The requirements and design of the input- output processing of an on-line steady state contingency analysis program for a power system control center are outlined in this paper. A method is described to accommodate the secondary changes in the power system configuration that may be caused by the input contingencies that have to be studied by this program. The scheme utilizes a technique to quickly detect contingencies that produce secondary changes, the presence of which requires the use of the topology processor before solving for the power flows. The output processing consists mainly of ranking the output data so that only a reasonable amount of information has to be displayed to the operator. In addition, the violation of equipment limits indicated by the program are tracked over time by using an equipment violation matrix which can be stored very efficiently using several different techniques.