OVERLOAD RANKING OF LINE OUTAGES WITH POST-OUTAGE CORRECTIVE RESCHEDULING

ABSTRACT

This paper presents a new view point for overload contingency ranking, which takes into account the post-outage corrective capability of the power system. Earlier approaches to contingency ranking have completely ignored this very important aspect. By using a new method developed in the paper the computational burden involved in post-contingency corrective rescheduling is considerably reduced. The efficiency of the proposed method stems from the fact that linear analysis (normally used in contingency ranking) permits optimization of the generation corrections for every contingency in the same base case pre-outage condition itself. This allows use of the same set of generation shift distribution factors (GSDFs) and loss formula coefficients for all line outage contingency optimizations. The optimization procedure adopted is similar to that used in the classical economic dispatch (ED) problem. Results for 25 and 95 Bus systems clearly demonstrate how the new approach reduces the overloads created by contingencies.

Keywords:

• Security
• optimization
• ranking
• corrective rescheduling