Phase-locked loop(PLL)based on the decoupled double synchronous reference frame(DDSRF-PLL)is proposed to deal with the synchronization of single-phase grid-connected power converters. The single-phase input signal is considered the sum of quadrature-phase components of positive and negative sequence in the αβ stationary frame against using the quadrature signal generator(QSG). A self-decoupling network is incorporated to detect the fundamental component of the input signal. By analyzing the performance of proposed PLL when the input signal contains DC components

high-frequency harmonics

frequency variation and phase-angle jumps

restraining methods are put forward. Simulations together with a series of experiments are conducted to show that the proposed PLL can extract the amplitude and phase of fundamental components quickly and accurately under various non-ideal grid conditions. This work is supported by Foundation for Science & Technology Commission Research Project of Chongqing(No. CSTC2012gg-yyjs90014)and Scientific and Technological Research Program of Chongqing Municipal Education Commission(No. KJ1501406).