摘要
交流电力弹簧(ACES)可有效抑制由高渗透率可再生能源发电引起的交流微电网有功功率波动,但ACES是典型的强耦合、非线性对象,而依赖于模型局部线性化的传统矢量控制难以实现存在不确性扰动情形下的宽范围功率精确控制。为此,文中提出一种基于鲁棒扰动观测器的ACES反馈线性化解耦控制方法。针对ACES的强耦合特性,构建了ACES两输入/两输出李导数仿射模型,设计了解耦矩阵,解耦矩阵与ACES耦合模型联合观测,可等效为全解耦的dq两相电流积分器,简化控制器设计。针对ACES的非线性特性,采用精确反馈线性化控制方法,设计状态变换矩阵,反馈线性化控制律与ACES非线性模型联合观测,可等效为完全线性化对象,采用简单线性控制,即可实现期望功率轨迹准确跟踪与系统全局渐进稳定运行。针对参数摄动影响精确反馈线性化控制性能的问题,设计了形式简单的鲁棒扰动观测器,消除不确性扰动对精确反馈线性化控制跟踪性能的影响。基于MATLAB/Simulink的仿真结果和基于dSPACE的实验结果表明所提方法具有结构简单、动态性能好、稳定域宽、鲁棒性强的特点。
The AC electric spring(ACES)can effectively suppress power fluctuations of the AC microgrid caused by the high proportion of renewable energy generation.Since ACES is a typical strongly coupled and nonlinear object,the traditional vector control that relies on local linearization is difficult to realize the exact power control with a wide range under the condition of uncertain disturbances.This paper proposes a feedback linearization decoupling control method of ACES based on the robust disturbance observer.Considering the strong coupling characteristics of ACES,the ACES two-input/two-output Lie derivative affine model is built,and the decoupling matrix is designed.When the decoupling matrix and the ACES coupling model are jointly observed,the joint system can be equivalent to the decoupled d-axis and q-axis current integrators,which makes the controller design simple.Considering the nonlinear characteristics of ACES,an exact feedback linearization control method is adopted and the state transition matrix is designed.When the feedback linearization control law and the ACES nonlinear model are jointly observed,the joint system can be equivalent to a linear object.With the simple linear control,the accurate tracking of the expected power trajectory and the operation with globally asymptotic stability can be realized.Aiming at the problem that the parameter perturbation affects the performance of exact feedback linearization control,a robust disturbance observer with a simple form is designed,and the influence caused by uncertainty disturbance on the tracking performance of exact feedback linearization control is eliminated.The simulation results based on MATLAB/Simulink and the experimental results based on dSPACE show that the proposed method has the characteristics of a simple structure,better dynamic performance,a wide stability range,and strong robustness.
作者
薛花
钦佳南
王育飞
张晓雯
李豪
XUE Hua;QIN Jianan;WANG Yufei;ZHANG Xiaowen;LI Hao(College of Electrical Engineering,Shanghai University of Electric Power,Shanghai 200090,China)
出处
《电力系统自动化》
EI
CSCD
北大核心
2021年第16期189-199,共11页
Automation of Electric Power Systems
基金
国家自然科学基金资助项目(51007053)
上海市科技创新行动计划资助项目(19DZ2204700)。
关键词
交流电力弹簧
交流微电网
反馈线性化控制
全解耦
鲁棒扰动观测器
AC electric spring(ACES)
AC microgrid
feedback linearization control
full decoupling
robust disturbance observer
