Several systems are considered for the National Grid of Sudan show strong signs of voltage instability or voltage collapse. It is proposed in this work to investigate the proximity of power systems to voltage instability with special reference to the National Grid. This work describes real life application in detection of proximity to voltage collapse by using L-index method. The research challenge was found out an appropriate method for detection voltage collapse in an effective manner. This work reflects that through case study conducted in National Grid of Sudan. The work is started with L-index method or technique. The L-indices for a given load condition are computed for all load buses and the maximum of L-indices gives the proximity of the system to voltage collapse. This work reports an analytic synthesis of real experience acquired to solve problems concerning with detection voltage collapse in National grid. Our methods provided several results. The validity of results was discussed with the known IEEE 14-bus system, IEEE 30-bus system, in addition to other methods. In this paper after detection of proximity to voltage collapse a compensation method of mitigating the voltage collapse by supplying the reactive power at load buses is discussed and compares the results with and without compensation.
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