An Implementation of Improved PLL for Control of Grid-Connected Converters Under Grid Perturbations

Journal of control, automation and electrical systems

article

Ghasemi, Ali¹  Refan, Mohammad Hossein¹  Amiri, Parviz¹ 

[1] Faculty of Electrical and Computer Engineering, Shahid Rajaee Teacher Training University

关键词: Unbalanced grid;    Grid-connected converters;    Phase-locked loop (PLL);    Synchronous reference;    Frame (SRF);   

DOI  :  10.1007/s40313-019-00470-1

学科分类：自动化工程

来源: Springer

【 摘 要 】

In this article, a new method is proposed for calculating electric angle using a phase-locked loop (PLL) to perform these calculations correctly under disturbance conditions of the grid voltage. This work is based on using the decoupled double synchronous reference frame PLL (DDSRF-PLL), and this kind of PLL has been expanded to solve its problems in the presence of harmonics and high disturbance in the input voltage. In the DDSRF-PLL, only components with a frequency of double the fundamental frequency will be deleted, but in the expanded PLL all the harmonics will be eliminated. The effect of this method was tested using both simulation and practical experimentation. The simulation of this method was performed in MATLAB software. It has been shown that this method is robust, precise and fast for calculating the electric angle under grid voltage perturbations. Subsequently, the developed PLL was implemented in a FPGA-based experimental setup and its function was studied.

【 授权许可】

CC BY