LCL并网逆变器滑模降阶复合控制策略  

Sliding Mode Reduced-order Composite Control Strategy for LCL Grid-connected Inverter

作　　者：黄春平[1] 陈帼鸾[1] 田森平[2] HUANG Chun-ping;CHEN Guo-luan;TIAN Sen-ping(Zhongshan Polytechnic,Zhongshan 528404,China)

机构地区：[1]中山职业技术学院,信息工程学院,广东中山528404 [2]华南理工大学,自动化科学与工程学院,广东广州510641

出　　处：《电力电子技术》2021年第4期107-110,119,共5页Power Electronics

基　　金：国家自然科学基金(61773170);广东省质量工程教育教学改革研究与实践项目(GDJG2019490)。

摘　　要：针对采用LCL型滤波器接入电网的三相逆变器的控制器设计问题,设计了一种新型多闭环架构滑模控制器(SMC)。当控制网侧电流时,带LCL滤波的三相并网逆变器离散时间域模型为具有非最小相位零的三阶系统,故将传统多闭环控制器中的电流内环采用离散时间域SMC实现,从而使得逆变器输出电流较好地跟踪参考电流,并与电网电压解耦,使系统模型降阶为类似于带CL滤波器的电流源逆变器二阶模型,从而降低了外环线性控制器设计难度,此外还引入了虚拟电阻进行谐振抑制。使用并网逆变器样机进行了新控制方案的测试,实验与仿真结果验证了多闭环架构SMC的控制性能。Aiming at the problem of controller design for three-phase grid-connected inverter with LCL filter,a novel sliding mode controller(SMC) with multi-closed-loop framework is designed.When controlling the grid-side current,the discrete-time model of the three-phase grid-connected inverter with LCL filter is a third-order system with nonminimum phase zero,therefore,the current inner loop in the traditional multi-closed-loop controller is implemented by a discrete-time SMC,so that the inverter output current can track the reference well and be decoupled from the grid voltage,this making the converter to behave like a current source inverter second order model with a CL filter.Thereby,the design difficulty of the outer loop linear controller is reduced,and a virtual resistor is introduced to suppress resonance.The new controller is tested using a grid-connected inverter prototype,and the experimental results verified the control performance of the multi-closed-loop framework SMC.

关 键 词：并网逆变器 滑模控制器 多闭环架构 

分 类 号：TM464[电气工程—电器]