Static Security Assessment of the Kenyan Power System Using Contingency Analysis of Newton Raphson Approach

This paper aims to evaluate the static security of the Kenyan Power System using Contingency Analysis (CA) and offer recommendations to mitigate the vulnerabilities of the power system. To achieve this, the System was modelled into the equivalent IEEE -39 Bus System and a CA done for different operating scenarios factoring in generators and transmission lines and considering an outage level of (N-1) using DIgSILENT Power Factory software. Newton Raphson (NR) Method was used to perform the CA since it was able to give information on the reactive energy flows and the bus voltages in the system. The component loading was between 80 -90% which operated closer to their loading limit thus limiting the load expansion and ability to withstand loading in case of a contingency. The bus voltages before CA was done ranged from 0.99 p.u. to 1.02 p.u and a loss of transmission line caused them to drop to as low as 0.6 p.u due to a decrease of reactive power injection. Recommendations to correct these violations without load shedding have been suggested to enable the system handle an outage level of (N-1).