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A fuzzy controller designed by the hybrid of genetic algorithm and particle swarm optimization (F-HGAPSO) is employed for thyristor controlled series capacitor to improve the transient stability of flexible AC transmission system. The fuzzy controller outputs an approximate series capacitance to flexible AC transmission system according to both the deviation of rotation speed and its change with time. To design the fuzzy controller, a new design approach, the F-HGAPSO, is proposed. Simulations have demonstrated the effectiveness of the proposed F-HGAPSO.