二阶LADRC的并网逆变器控制及稳定性分析  

Grid-connected inverter control and stability analysis of second-order LADRC

作　　者：杨路勇 李琛 胡延兵 杨霞 段大伟 李腾飞 YANG Luyong;LI Chen;HU Yanbing;YANG Xia;DUAN Dawei;LI Tengfei(State Grid Shandong Electric Power Company Yucheng Power Supply Company,Yucheng 200254,China)

机构地区：[1]国网山东省电力公司禹城市供电公司,山东禹城251200

出　　处：《电气应用》2022年第6期1-8,共8页Electrotechnical Application

摘　　要：并网逆变系统的稳定性对电网安全运行十分重要,提高并网系统的稳定性仍然是当前研究的关键内容。针对逆变系统的强耦合以及网侧电压的波动问题,建立了一种并网逆变控制系统的二阶数学模型,并在其状态空间模型基础上设计了用于状态观测的线性扩张状态观测器(LESO)和扰动估计的误差反馈控制律(LSEF),然后在电压环引入二阶线性自抗扰控制器(LADRC),通过李雅普诺夫稳定性理论证明了二阶LADRC的稳定性,并给出稳定性条件。最后,在MATLAB/Simulink数字平台上搭建了并网系统的仿真模型,并在网侧设计低电压穿越故障,仿真结果表明,无论是从快速性指标,还是从系统受到波动时的稳定性指标来看,二阶LADRC的控制能力明显优于传统PI控制。The stability of the grid-connected inverter system is very important for the safe operation of the power grid.Improving the stability of the grid-connected system is still the key technology of current research.Aiming at the problem of strong coupling of inverter systems and the fluctuation of grid-side voltage,a secondorder mathematical model of an grid-connected control system is established,and a linear expansion state for state observation is designed based on its state space model observer(Linear Extended State Observer,LESO) and disturbance estimation error feedback control law(Linear State Error Feedback,LSEF),and then introduce the second order linear active disturbance rejection controller(LADRC) in the voltage loop.The stability of the secondorder LADRC controller is proved by Lyapunov stability theory,and the stability conditions are given.Finally,a simulation model of grid-connected system is built on the MATLAB/Simulink digital platform,and a low-voltage ride-through fault is designed on the grid-side.The simulation results show that the control ability of second-order LADRC is obviously better than that of traditional PI control,whether in terms of rapidity index or stability index when the system is subjected to fluctuation.

关 键 词：并网系统 线性扩张状态观测器 电压环 李雅普诺夫稳定性理论 低电压穿越 

分 类 号：TM464[电气工程—电器]