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张博文,王萍,贝太周.一种降低电网谐波影响的单相自适应锁频方案[J].电源学报,2018,16(3):99-105
一种降低电网谐波影响的单相自适应锁频方案
Single-phase Adaptive FLL Scheme for Reducing the Influence of Power Grid Harmonics
投稿时间:2016-11-01  修订日期:2017-10-24
DOI:10.13234/j.issn.2095-2805.2018.3.99
中文关键词:  光伏  单相并网系统  二阶广义积分正交信号发生器(SOGI-QSG)  频率自适应
英文关键词:photovoltaic  single-phase grid-connected system  second-order generalized integrator-quadrature signal generator (SOGI-QSG)  frequency adaptive controller
基金项目:科技部国家重点研发计划资助项目(2016YFB0900204)
作者单位E-mail
张博文 天津大学电气自动化与信息工程学院智能电网教育部重点实验室, 天津 300072 bwzhang@tju.edu.cn 
王萍 天津大学电气自动化与信息工程学院智能电网教育部重点实验室, 天津 300072  
贝太周 国网济南供电公司, 济南 250012  
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中文摘要:
      随着分布式发电的发展,在单相光伏场景中性能可靠的电网同步技术是实现逆变器高效并网的重要前提。提出了一种有效的单相自适应锁频算法,该算法主要由1个级联的二阶广义积分正交信号发生器SOGI-QSG(second-order generalized integrator-quadrature signal generator)和1个简单可靠的频率自适应控制器组成。理论分析表明,级联SOGI-QSG结构具有良好的滤波性能,可以改善谐波含量高的电压信号。在电网遭受频率波动时,所提出的频率自适应控制器可以快速跟踪电网频率的瞬时变化。仿真和实验验证了所提方案的可行性和有效性。
英文摘要:
      Along with the development of distributed generations, a reliable grid synchronization technology in the single-phase photovoltaic(PV) scenario is an important precondition for inverters to be effectively connected to power grid. In this paper, an effective single-phase adaptive frequency-locked loop(FLL) algorithm is proposed, which consists of a cascaded second-order generalized integrator-quadrature signal generator(SOGI-QSG) and a simple and reliable frequency ad-aptive controller. Theoretical analysis reveals that the cascaded SOGI-QSG has a good filtering performance, so it can improve the voltage signal containing more harmonic distortions; moreover, the proposed frequency adaptive controller can fast track the transient change of grid frequency when the grid suffers from frequency fluctuations. Simulation and experimental results verified the feasibility and effectiveness of the proposed scheme.
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