内容：
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。 In order to improve the operational stability of the AC / DC combined transmission system with unknown damping coefficient, the unknown parameters of the system are dynamically estimated. Considering the shortcomings of the adaptive backstepping sliding mode controller, an adaptive global terminal sliding mode control method is used to design a Non - linear Additive Controller for New Type HVDC Transmission System. This method improves the stability of the whole system by rapidly adjusting the transmission power of the DC transmission line. The advantages of the integrated linear sliding mode and the nonlinear sliding mode make the instability system reach the equilibrium state quickly and accurately. The system is affected by uncertain perturbation and three-phase short-circuit disturbances with unknown upper bounds, and real-time dynamic estimation of unknown unknowns and unknown parameters of the system. Compared with the adaptive backstepping sliding mode controller, the results show that the controller has smaller overshoot, shorter control response time, more accurate unknown parameter estimation performance and stronger robustness, Can more effectively improve the stability of the system.

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