摘要
单环加权平均电流控制因其固有的有源阻尼而成为LCL型并网逆变器的研究热点。它不需要额外的有源阻尼,就能赋予并网逆变器强鲁棒性。但是,它需要两个电流传感器。鉴于此,该文提出一族适用于不同权值范围的分裂电流实现方案,仅需采用一个电流传感器。建立分裂电流控制方法的统一模型,结合公共耦合点电压前馈所引入的潜在阻尼,对总阻尼性能进行研究,并在此基础上提出强鲁棒性的权值设计方案。根据权值的强鲁棒性设计结果,可选择合适的分裂电流实现方案。理论分析和实验结果表明,该方案可以同时获得强鲁棒性、高电能质量和低成本。
The single-loop weighted average current(WAC)control is attractive for the LCL-type grid-connected inverter owing to its inherent active damping.High robustness can be naturally harvested without any additional damping,but it requires two current sensors.Depending on the different weight values,a family of the splitting current single-loop control schemes with the associated filter configurations was developed in this paper,where only one current sensor is needed.Furthermore,considering the potential damping of the point of common coupling(PCC)voltage feedforward,a unified model of these splitting current single-loop control schemes was established,and the overall active damping performance was evaluated,paving a way for the robust design.To tolerate the grid impedance variation,the robust range of the weight value was depicted,which helps select the proper correlative splitting current single-loop control scheme.Experimental results are in well agreement with the theoretical expectations,and confirm that high robustness,high-quality grid current and cost-efficiency can be concurrently achieved.
作者
赫玉莹
王学华
刘福鑫
HE Yuying;WANG Xuehua;LIU Fuxin(Huazhong University of Science and Technology,Wuhan 430074,Hubei Province,China;Nanjing University of Aeronautics and Astronautics,Nanjing 211106,Jiangsu Province,China)
出处
《中国电机工程学报》
EI
CSCD
北大核心
2021年第10期3536-3546,共11页
Proceedings of the CSEE
基金
国家重点研发计划项目(2016YFB0900100)。
关键词
单环
加权平均电流
PCC电压前馈
有源阻尼
鲁棒性
single-loop
weighted average current
PCC voltage feedforward
active damping
robustness
