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新型光伏并网逆变器的建模与控制方法 被引量:5
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作者 姚乐乐 刘晓悦 《电力系统及其自动化学报》 CSCD 北大核心 2018年第5期98-110,共13页
将由对称Z源逆变器和三相对称LCL滤波器组成的光伏并网逆变器作为研究对象,对Z源网络和一相LCL滤波器建立数学模型。将模型参数看作系统参数,模型输入信号的变化看作扰动,根据模型的固有缺陷,结合前期成果,重点研究两种情况的系统改进策... 将由对称Z源逆变器和三相对称LCL滤波器组成的光伏并网逆变器作为研究对象,对Z源网络和一相LCL滤波器建立数学模型。将模型参数看作系统参数,模型输入信号的变化看作扰动,根据模型的固有缺陷,结合前期成果,重点研究两种情况的系统改进策略:(1)系统参数未变化且扰动可测;(2)系统参数变化或扰动不可测。针对第1种情况,改进时主要采取加入"模拟模块"和"开关切换"的策略;针对第2种情况,改进策略是对系统加入稳定性鲁棒控制器。通过仿真实验验证,结果表明Z源网络和一相LCL滤波器的数学模型正确,在此基础上针对第1种情况采取的改进策略比改进前暂态性能得到提高,稳态性能与原系统一致;针对第2种情况采取的改进策略比改进前稳定性得到提高。 展开更多
关键词 Z源网络 LCL滤波器 数学模型 模拟模块 稳定性鲁棒控制器
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Robust tracking control design for a flexible air-breathing hypersonic vehicle 被引量:2
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作者 张垚 鲜斌 +2 位作者 刁琛 赵勃 郭建川 《Journal of Central South University》 SCIE EI CAS 2014年第1期130-139,共10页
A nonlinear robust controller was presented to improve the tracking control performance of a flexible air-breathing hypersonic vehicle(AHV) which is subjected to system parametric uncertainties and unknown additive ti... A nonlinear robust controller was presented to improve the tracking control performance of a flexible air-breathing hypersonic vehicle(AHV) which is subjected to system parametric uncertainties and unknown additive time-varying disturbances.The longitudinal dynamic model for the flexible AHV was used for the control development.High-gain observers were designed to compensate for the system uncertainties and additive disturbances.Small gain theorem and Lyapunov based stability analysis were utilized to prove the stability of the closed loop system.Locally uniformly ultimately bounded tracking of the vehicle's velocity,altitude and attack angle were achieved under aeroelastic effects,system parametric uncertainties and unknown additive disturbances.Matlab/Simulink simulation results were provided to validate the robustness of the proposed control design.The simulation results demonstrate that the tracking errors stay in a small region around zero. 展开更多
关键词 hypersonic vehicles nonlinear robust control flexible mode small gain theorem LYAPUNOV
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Path planning and stability control of collision avoidance system based on active front steering 被引量:14
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作者 WNAG Chun Yan ZHAO WanZhong +1 位作者 XU ZhiJiang ZHOU Guan 《Science China(Technological Sciences)》 SCIE EI CAS CSCD 2017年第8期1231-1243,共13页
Vehicle collision avoidance system is a kind of auxiliary driving system based on vehicle active safety,which can assist the driver to take the initiative to avoid obstacles under certain conditions,so as to effective... Vehicle collision avoidance system is a kind of auxiliary driving system based on vehicle active safety,which can assist the driver to take the initiative to avoid obstacles under certain conditions,so as to effectively improve the driving safety of vehicle.This paper presents a collision avoidance system for an autonomous vehicle based on an active front steering,which mainly consists of a path planner and a robust tracking controller.A path planner is designed based on polynomial parameterization optimized by simulated annealing algorithm,which plans an evasive trajectory to bypass the obstacle and avoid crashes.The dynamic models of the AFS system,vehicle as well as the driver model are established,and based on these,a robust tracking controller is proposed,which controls the system to resist external disturbances and work in accordance with the planning trajectory.The proposed collision avoidance system is testified through CarSim and Simulink combined simulation platform.The simulation results show that it can effectively track the planning trajectory,and improve the steering stability and anti-interference performance of the vehicle. 展开更多
关键词 autonomous vehicle collision avoidance system path planning μ synthesis robust control active front steering
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