基于FPGA的二阶广义积分器锁相环研究与实现

Research and Design on Second Order Generalized Integrator PLL Based on FPGA

为了解决三相电网电压存在谐波、不对称分量和频率变动的复杂情况锁相问题,通过二阶广义积分器(SOGI)原理构建自适应滤波器,采用对称分量法提取基频信号中的正序分量,再变换到旋转坐标系下,通过PI整定出电网基频信号正序分量的频率,最后由积分得到角度信息。针对传统SOGI结构两相正交信号发生器使用同一个系数的缺点,提出一种改进方案,并阐述了现场可编程门阵列(FPGA)的实现方法,最终实验验证了该改进方案的正确性。

To solve the complex phase locking problem of contains harmonic, unbalanced components and frequency jump, construct the adaptive filter based on the principle of the second order generalized integrator（SOGI）, symmetri- cal component method is used to extract positive-sequence components from the fundamental-frequency signal, and then obtain the frequency information via PI at the rotating coordinate system, finally get the angle information by the integral.For case of shortcomings of the two phase orthogonal signal generator of SOGI using a same coefficient, an improved scheme is proposed, and the implementation method of field programmable gate array （FPGA） is described, finally the correctness of the improved scheme is verified by the experiment.