非理想电网条件下双馈电机网侧变换器的改进超螺旋终端滑模控制  

Improved Super-helical Terminal Sliding Mode Control of Doubly-fed Motor Grid-side Converter under Nonideal Grid Conditions

作　　者：王宁 董锋斌[1] 罗育恒 樊犇 WANG Ning;DONG Feng-bin;LUO Yu-heng;FAN Ben(School of Electrical Engineering,Shaanxi University of Technology,Hanzhong 723000,China)

机构地区：[1]陕西理工大学电气工程学院,汉中723000

出　　处：《科学技术与工程》2025年第3期1054-1064,共11页Science Technology and Engineering

基　　金：陕西省自然科学基础研究计划(2023-JC-YB-442)。

摘　　要：为了提高不平衡及谐波电网电压下双馈风力发电机网侧变换器的控制性能,提出了一种改进超螺旋快速终端滑模的直接功率控制算法。首先,在两相静止坐标系下分析了网侧变换器在不平衡及谐波电网电压下以功率为状态变量的数学模型。然后,在进行功率内环设计时,针对数学模型中的负序以及各谐波分量导致的干扰,采用非线性扩张状态观测器进行观测。其次,为保证系统能在更短的时间内达到稳态,构造非奇异快速终端滑模面,并结合改进超螺旋滑模趋近律来设计了功率内环的滑模控制律。同样对电压外环也设计了终端滑模控制律。并利用Lyapunov函数证明了非奇异快速终端滑模面、改进超螺旋控制算法及非线性扩张状态观测器的稳定性。最后,通过与三种不同的控制方案来进行仿真对比,验证了所提控制方法的合理性和有效性。In order to improve the control performance of a doubly-fed wind turbine grid-side converter under unbalanced and har-monic grid voltages,a direct power control algorithm with an improved super-helix fast terminal sliding mode was proposed.First,the mathematical model of the grid-side converter under unbalanced and harmonic grid voltages with power as the state variable was ana-lyzed in a two-phase stationary coordinate system.Then,the power inner-loop design was carried out with a nonlinear expansion state observer for the negative sequence in the mathematical model as well as the disturbances due to each harmonic component.Secondly,to ensure that the system can reach the steady state in a shorter time,the non-singular fast terminal sliding mode surface was construc-ted and the sliding mode control law for the power inner loop was designed by combining with the improved super-helical sliding mode convergence law.Similarly the terminal sliding mode control rate was also designed for the voltage outer loop.The stability of the non-singular fast terminal sliding mode surface,the improved super-helix control algorithm and the nonlinear expanding state observer was also proved by using the Lyapunov function.Finally,the method was verified to have faster convergence and stronger robustness by comparing it with three different control schemes to perform simulations.

关 键 词：双馈风力发电机 网侧变换器 非奇异快速终端滑模面 改进超螺旋算法 非线性扩张状态观测器 

分 类 号：TM315[电气工程—电机]