This paper presents an improved operation of the Custom power park with a newly proposed control algorithm for series active filter. Custom power devices operated for multiple customers in an industrial area form a common platform called custom power park (CPP). CPP delivers high quality high reliable supply than from the utility at different grades. The enhanced operation of CPP is proposed with GTO based static transfer switch, shunt and series active filters.The shunt active filter provides the harmonic and reactive power support for the park while voltage sag/swell and voltage harmonic mitigation is done by means of series active filter with a newly proposed control algorithm. The entire model of CPP is developed and operation is verified using MATLAB/ Simulink model.