摘要
为抑制LCL型并网逆变系统自身存在的谐波谐振现象并提高系统稳定性,提出一种基于自抗扰和内模相结合的控制策略。对LCL型并网逆变三阶系统的数学模型做分阶处理,将其转为二阶系统和一阶系统,其中二阶系统采用基于改进扩张线性观测器的二阶改进线性自抗扰控制,一阶系统采用内模解耦控制,构成新型双闭环控制策略,并选取了合适的Lyapunov函数,证明了系统最终会稳定收敛。最后在Matlab/Simulink平台上对两级三相式光伏逆变系统的并网电流进行了波形仿真,验证了此方案的实效性和工程应用价值。
To suppress the inherent phenomenon of harmonic resonance in an LCL-type grid-connected inverter system and improve its stability,a control strategy based on the combination of active disturbance rejection control(ADRC)and internal mode control(IMC)is proposed.The mathematical model of the LCL-type grid-connected inverter third-order system is divided into a second-order system and a first-order system.The former adopts second-order improved linear ADRC based on an improved linear extended state observer,while the latter adopts the IMC decoupling control,thus forming a novel double closed-loop control strategy.In addition,an appropriate Lyapunov function is selected,and it is proved that the system will eventually converge stably.Finally,the simulation of the grid-connected current waveform in a two-stage three-phase PV inverter system is carried out on the Matlab/Simulink platform,which verifies the effectiveness of the proposed scheme and its engineering application value.
作者
周雪松
郭帅朝
马幼捷
李月超
ZHOU Xuesong;GUO Shuaichao;MA Youjie;LI Yuechao(Tianjin Key Laboratory of Control Theory and Application for Complex Systems,Tianjin University of Technology,Tianjin 300384,China;School of Electrical and Electronic Engineering,Tianjin University of Technology,Tianjin 300384,China)
出处
《电力系统及其自动化学报》
CSCD
北大核心
2022年第11期116-125,共10页
Proceedings of the CSU-EPSA
基金
国家自然科学基金资助面上项目(51877152)。
关键词
光伏系统逆变器
谐波谐振
改进线性自抗扰控制
内模控制
inverter for PV system
harmonic resonance
improved linear active disturbance rejection control
internal mode control
