摘要
针对非隔离型光伏并网逆变器存在直流分量注入问题,提出一种基于改进比例复数积分(PCI)控制器的直流分量抑制策略。将直流分量当作系统的扰动,设计相应的扰动观测器(DOB),利用DOB对系统中的直流分量进行实时观测,并基于直流分量的观测值设计补偿环节,实现对直流分量的抑制。此外,针对系统在传统PCI控制器控制下存在系统相位裕度不足的问题,将传统PCI控制器的实数形式的谐振系数替换为复数形式,在复数域下设计改进型PCI控制器,提高系统的相位裕度。最后通过仿真与实验验证所提控制策略的可行性与有效性。
The DC component injection issues exist in the non-isolated PV grid-connected inverter application.In this paper,an novel DC component suppression strategy was proposed based on an improved PCI controller.Firstly,considering the DC component as system disturbance,a disturbance observer(DOB) was designed to observe the system’s DC component in real-time,then a compensation method was designed for suppressing DC component based on the observed value of DC component.Secondly,a resonance complex coefficient PCI controller was substitute for the traditional PCI controller to obtain more phase margin.Finally,the feasibility and validity of the proposed strategy were verified by the simulation and experimental results.
作者
干天助
梁理程
陈延礼
丁欣
陈延明
Gan Tianzhu;Liang Licheng;Chen Yanli;Ding Xin;Chen Yanming(School of Electrical Engineering,Guangxi University,Nanning 530004,China;Shenzhen Yadiwei Technology Co.,Ltd.,Shengzhen 518067 China;Guangxi Vocational College of Water Resources and Electric Power,Nanning 530023,China)
出处
《太阳能学报》
EI
CAS
CSCD
北大核心
2022年第7期93-100,共8页
Acta Energiae Solaris Sinica
基金
国家自然科学基金(51567004)
广西重点研发计划(AB18126026)
广西高等学校高水平创新团队及卓越学者计划(桂教人才[2020]6号)。
关键词
PV
并网逆变器
直流抑制
观测器
PCI控制
相位补偿
PV
inverters
disturbance rejection
observers
proportional complex integral(PCI)controller
phase compensation
