交直流联合输电系统中HVDC的自适应全局快速Terminal滑模控制

发布时间：2018-11-09 17:48

【摘要】：为了提高阻尼系数未知的交直流联合输电系统的运行稳定性,对系统未知参数进行动态估计,同时考虑到自适应backstepping滑模控制器的不足,采用自适应全局Terminal滑模控制方法,设计了一种新型直流输电系统的非线性附加控制器。该方法通过快速调节直流输电线路的输送功率,实现对整个系统稳定性的调节;综合线性滑动模态与非线性滑动模态的优点,使失稳系统能够快速、精确地收敛至平衡状态;考虑系统受具有未知上界的不确定小扰动及三相短路大扰动的影响,分别对干扰未知上界及系统未知参数进行实时动态估计。通过与自适应backstepping滑模控制器进行数值仿真对比,结果表明,该控制器具有更小的超调量,更短的控制响应时间,更准确的未知参数估计性能和更强的鲁棒性,能够更有效地提高系统的稳定性。
[Abstract]:In order to improve the operational stability of AC / DC joint transmission system with unknown damping coefficient, the unknown parameters of the system are dynamically estimated. Considering the deficiency of adaptive backstepping sliding mode controller, adaptive global Terminal sliding mode control method is adopted. A new nonlinear additional controller for HVDC system is designed. This method adjusts the stability of the whole system by adjusting the transmission power of HVDC transmission lines quickly, and integrates the advantages of linear sliding mode and nonlinear sliding mode to make the unstable system converge to the equilibrium state quickly and accurately. Considering the influence of uncertain small disturbance with unknown upper bound and large disturbance of three-phase short circuit, real-time dynamic estimation of unknown upper bound of disturbance and unknown parameters of system are carried out respectively. Compared with the adaptive backstepping sliding mode controller, the simulation results show that the controller has less overshoot, shorter control response time, more accurate estimation performance of unknown parameters and stronger robustness. It can improve the stability of the system more effectively.
【作者单位】：华北电力大学电气与电子工程学院;国网安徽省电力公司;
【基金】：国家自然科学基金资助项目(61372050)
【分类号】：TM721.1

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