The power system has to be operated within acceptable scope of voltage stability by properly setting up reactive power sources and voltage profile. Besides the system guides to the in stability of voltage and requires proper control. The measures against voltage unsteadiness are protective and corrective controls. The proposed work gives a methodical approach to enhance the voltage stability of a test system. So a preventive counteract measure is proposed for voltage and reactive power management initial at generator's approach to maximize the Effective Generator Reactive Power Reserve (EGRPR). An proficient process to maximize EGRPR is formulated as a Fuzzy controlled optimization problem where P-delta loop and Q-V loop is updated for iteration. For wide range of loading conditions the Fuzzy membership functions are generated from unsupervised learning using Self Organizing Featured Maps (SOFM). A simple SOFM Fuzzy constrained OPF and Bender's decomposition methods are used to maximize the EGRPR and proposed method is tested on 6- bus structure.