中国电机工程学报2016，Vol.36Issue(13)：3620-3628,9.DOI:10.13334/j.0258-8013.pcsee.151359
基于离散谐振器的自适应数字锁频环设计
The Design for Digital Adaptive Frequency-Locked-Loop Based on Discrete Resonators
摘要
Abstract
The grid-tied converter for distributed generations is required with high control performance, which indicates that it is particularly important to estimate the information of the amplitude, frequency and harmonic of grid voltages. This paper proposed a novel discrete-time discrete resonator (DR) which was suitable for single-and three-phase systems simultaneously. And the integration property, especially the selectivity characteristic of positive and negative sequence components, was analyzed under the digital frequency domain. Based on the proposed DRs, the digital frequency-locked loop (DFLL) was designed. Furthermore, a systemic mathematical model of multiple DR was established to analyze the influence of gains for each DR by means of root locus. The DFLL proposed in this paper was convenient to be implemented digitally and can estimate the frequency of grid voltage fundamental with a high degree of precision which would not be influenced by sampling frequencies. Finally, the validity and superiority of the proposed DFLL are verified through simulations and laboratory experiments.关键词
离散谐振器/数字锁频环/电网同步/谐波检测Key words
discrete resonator/digital frequency-locked loop/grid synchronization/harmonic detection分类
信息技术与安全科学引用本文复制引用
全相军,窦晓波,吴在军,胡敏强,袁简,倪春花..基于离散谐振器的自适应数字锁频环设计[J].中国电机工程学报,2016,36(13):3620-3628,9.基金项目
国家863高技术基金项目(2014AA052002)；国家自然科学基金项目(51307023)；国家电网公司项目(521820150005)。 The National High Technology Research and Development of China 863 Program (2014AA052002) （2014AA052002）
Program Supported by National Natural of Science Foundation of China (51307023) （51307023）
The State Grid Corporation Project (521820150005) （521820150005）
