中文摘要：

提出一种双自调谐二阶广义积分器锁频环（frequency-locked loop based on double self-tuning second order generalized integrator，DSSOGI—FLL）同步方法，该方法将自调谐滤波器（self-tuning filter）与优化的SOGI两种结构相级联，构成一种双自调谐二阶广义积分器（self-tuning second order generalized integrator，SSOGI），该结构具有较SOGI更佳的滤波能力；同时，通过引入求差节点和一阶高通滤波器，使其具备了消除直流分量的能力；最后，应用幅值归一化算法对锁频环（FLL）结构进行参数设计，达到易于数字化实现的效果。仿真与实验结果验证文中所提DSSOGI-FLL方法的可行性与有效性。

英文摘要：

This paper proposes a kind of frequency-locked loop based on double self-tuning second order generalized integrator（DSSOGI-FLL）, and it makes a self-tuning filter and a SOGI be cascade connection, constructing a self-tuning second order generalized integrator （SSOGI） , which has the better ability to filter than SOGI. At the same time, by adding the node of subtraction and first-order high-pass filter, further optimizing the structure of SSOGI, it has the ability to eliminate the DC offset. Finally, using the application of amplitude normalization algorithm to design the parameters of FLL structure, to achieve digital implementation easily. The effectiveness and feasibility of the DSSOGI-FLL method are verified by simulation and experimental results.