Critical Boundary Index (CBI) based on active and reactive power deviations

Abstract

The voltage collapse phenomenon is one of the serious concerns for power system stable operation. Power system blackout can take place in a part or entire system due to severe voltage instability and inadequate power transfer capability. Therefore, power system operation continuous monitoring and enhancement of the power transmission capability are major concerns for power system planning, design and operation. This study proposes an improved voltage stability index by drawing analogy from existing indices, which are based on active and reactive power changes in a power system. The objective of the employed computational technique is to measure the critical boundaries, therefore, the proposed index is called Critical Boundary Index CBI. The Lagrange Constant computational method is employed to derive the improved index. Then a comparative analysis of the similar indices are presented to show the advantage of the proposed index. Lastly, proposed and conventional indices are evaluated using IEEE 5, 14, and 57 bus test systems. The results indicate some advantages of the proposed index compared to the conventional indices in the same way. Such as applicability of the proposed index for various types of power system topologies with high accuracy.