电源学报2024，Vol.22Issue(2)：167-174,8.DOI:10.13234/j.issn.2095-2805.2024.2.167
弱电网下LCL逆变器的有源阻尼控制策略研究
Research on Active Damping Control Strategy for LCL Inverter in Weak Grid
摘要
Abstract
In a weak grid,due to the existence of grid impedance,the natural resonant frequency of a new energy grid-connected LCL filter will shift,and the traditional active damping control strategy cannot guarantee the system sta-bility.Moreover,as the proportion of new energy power generation in the power system continues to grow,how to reduce the operating costs is a hot topic for research.Therefore,a novel control strategy based on grid-connected current and common coupling voltage feedback is proposed in this paper,which not only provides active damping to suppress LCL resonance,but also reduces the use of sensors.In addition,it has a strong adaptability under wide-ranging changes in grid impedance.Simulation and experimental results show that,compared with that under the traditional control strategy,the practical range of weak grid under the improved strategy increases,the system stability is enhanced,and the capabil-ity to suppress harmonics is raised,indicating that the quality of grid-connected current is well improved.关键词
弱电网/LCL滤波器/并网逆变器/有源阻尼Key words
Weak grid/LCL filter/grid-connected inverter/active damping分类
信息技术与安全科学引用本文复制引用
王翰文,曾成碧,苗虹..弱电网下LCL逆变器的有源阻尼控制策略研究[J].电源学报,2024,22(2):167-174,8.基金项目
国家重点研发资助项目(2018YFC1505502-03) （2018YFC1505502-03）
成都市科技局资助项目(2019-YF05-02107-SN) （2019-YF05-02107-SN）
四川省重点研发资助项目(21ZDYF3753)This work is supported by National Science and Technology Program under the grant 2018YFC1505502-03 （21ZDYF3753）
Chengdu Sci-ence and Technology Program under the grant 2019-YF05-02107-SN （）
Sichuan Science and Technology Program under the grant 21ZDYF3753 （）
