基于超螺旋滑模控制的LCL三相逆变器离网扰动抑制策略

Islanded Disturbance Suppression Strategy for LCL Three-Phase Inverter based on Super-Twisting Sliding Mode Control

三相逆变器系统使用传统控制方法存在抗干扰能力差及发生扰动后的动态特性慢等局限性,同时控制器设计对LCL滤波器参数不确定性敏感。针对以上问题,文中提出了一种基于超螺旋算法的LCL三相逆变器离网扰动抑制策略。首先,在dq坐标系下对三相LCL逆变器设计超螺旋滑模控制数学模型,优化电压电流双环控制结构;其次,在PLECS软件对该离网逆变器进行仿真,验证超螺旋算法对参数波动不敏感的特性;最后,基于RT Box半实物实验平台分别进行了负载波动和电压参考实验。与传统PI控制对比,所提超螺旋滑模控制方法具有较强的鲁棒性、稳定性和动态特性。

The conventional control methods used in three-phase inverter systems have limitations such as poor anti-interference capabilities and slow dynamic response after disturbances,Additionally,controller design is sensitive to parameter uncertainties in LCL filter.In this paper,a disturbance suppression strategy for LCL three-phase inverters using the super-twisting algorithm is proposed to address these issues.Firstly,a mathematical model for the Super-twisting sliding mode control of three-phase LCL inverter in the dq coordinate system is designed to optimize the voltage and current double-loop control structure.Secondly,simulation of the islanded inverter is conducted using the PLECS software to verify the insensitivity of the Super-twisting algorithm to parameter fluctuations.Finally,experimental validation is carried out on the RT Box semi-physical experimental platform under load fluctuations and voltage reference experiments.The proposed Super-twisting sliding mode control method exhibits strong robustness,stability,and dynamic characteristics as compared to traditional PI control.