By applying dwt and mallat in wavelet analysis, the oscillation signal of active power on transmission line is decomposed and reconstructed; the strategy of upfc's secondary control based on wavelet is proposed by using the reconstructed active power as input signal . simulation results verify the efficiency of damping subsequent swing quickly under serious power oscillation circumstance that is hard to damp by ordinary upfc controller . the system dynamic stability is apparently enhanced 針對系統(tǒng)功率波動頻率較高情況下upfc對系統(tǒng)后續(xù)擺穩(wěn)定的控制作用難以得到充分發(fā)揮的情況,采用小波分析的mallat塔式算法對系統(tǒng)功率波動信號進行分解,并基于mallat塔式重構(gòu)算法的思想濾除了信號的冗余擾動成份,尋找到一個高壓縮比、低相對誤差的重構(gòu)功率信號,從而使其能夠符合upfc實際控制需要。