摘要
为解决三相并网逆变器电流控制中网压扰动、变量耦合和模型参数偏差等诸多问题,在控制器设计中引入自抗扰技术。利用扩张状态观测器(ESO)对未知扰动进行估计,可同时补偿这些因素的影响。在分析ESO的误差特性和系统传递函数的基础上,提出了带宽参数的设计准则。通过引入等效增益系数,对比分析了线性/非线性ESO的估计、控制效果。仿真结果表明,所设计的控制器对系统参数变化具有强鲁棒性。最后通过实验进一步证实了ESO对扰动的估计和补偿能力,并给出了电感参数未知时控制增益的整定方法。
In order to solve the multiple problems in the current control of three-phase grid-connected inverters, such as grid voltage disturbance, variable coupling and model parameter deviation, etc., active disturbance rejection control(ADRC) method is introduced in the controller design. Using the extended state observer(ESO) to estimate the unknown disturbance, the infuence of these factors can be compensated simultaneously. Based on the analysis of the error characteristics of the ESO and the system transfer function, the design criteria of the bandwidth parameters are proposed. By introducing the equivalent gain coeffcient, the estimation and control effects of the linear/nonlinear observers are compared and analyzed. Simulation results reveal that the designed controllers are robust to system parameter variations. Finally, the ability of ESO to estimate and compensate for disturbances is further verifed through experiments, and a method for setting the control gain when the inductance parameter is unknown is given.
作者
王兴
杨凯
张伟健
WANG Xing;YANG Kai;ZHANG Weijian(State Key Laboratory of Advanced Electromagnetic Engineering and Technology(School of Electrical and Electronic Engineering,Huazhong University of Science and Technology),Wuhan 430074,China)
出处
《电气应用》
2021年第1期19-27,共9页
Electrotechnical Application
基金
国家自然科学基金(51677078)
深圳市科技计划项目(JCYJ20170307160832442)。
关键词
并网逆变器
自抗扰控制器
带宽参数
等效增益系数
控制增益
grid-connected inverters
active disturbance rejection controller
bandwidth parameters
equivalent gain coeffcient
control gain
