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T his paper prese nts a new methodo logy fo r e nhancement o f vo ltage security using a vo ltage stability index. T he o bjective functio n is the minimizatio n o f reactive power injection, whic h is o f prime importance fo r maintaining desired le ve l o f vo ltage security. Linearized increm ental mode l has bee n used.Linear set o f coo rdinatio n equations has bee n obtained who se direct so lution give s the o ptimal reactive power co ntro l correctio ns to ac hieve the desired o ptimized so lutio n. T he algorithm develo ped has been imple mented o n two sample te st syste ms.

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