In order to improve the stability of the power system, suppressing the low frequency oscillation of power system is already a problem that every country is eager to solve. Many power workers have done a lot of theoretical research and experimental verification on low-frequency oscillation and have got remarkable achievements. Energy from the Demand Side has been widely used in our daily life, and thousands of demand response loads have been used in frequency control whose controlling effects

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... quite obvious; meanwhile, because of the development of electrical technology, many smart grid devices can be fully used, and they have improved the stability of power system, which is consistent with the original intention of putting demand response loads into power system. UPFC can improve the system damping, and effectively suppress the low-frequency oscillation of the system as well as improve the stability of the power angle, so if UPFC and demand response are combined, the low frequency oscillation of the power system can be better suppressed.