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Reactive power planning is vital for maintaining the voltage stability of power systems and evolutionary algorithms are highly useful for achieving this task. This paper compares the eectiveness of the dierential evolution (DE) and evolutionary programming (EP) algorithms in optimizing the reactive power planning of power systems under line outage contingency conditions. DE is ecient in exploration through the search space of the problem, while EP is simple and easy to implement. The low cost but fast response thyristor-controlled series capacitor (TCSC) exible alternating current transmission system (FACTS) device is incorporated to control the power ows. The optimal settings of the control variables of the generator voltages, transformer tap settings, and location and parameter settings of the TCSC are considered for reactive power planning and the resultant reactive power reserves. The eectiveness of the

turkish journal of electrical engineering and computer sciences/elektrik

OPF based reactive power planning and voltage stability limit improvement under single line outage contingency condition through evolutionary algorithms