基于分数阶LCL滤波器的风力发电网侧控制研究

为提高并网电能质量,提出采用分数阶PI（PI^λ）控制器来实现网侧控制、采用分数阶LCL（FOLCL）滤波器进行滤波的方案。首先通过理论推导得出FOLCL滤波器能从根本上避免谐振的特性,然后建立网侧逆变系统分数阶数学模型,并推导分数阶双闭环控制结构,最后在网侧引入PI^λ控制器并对其参数进行设计。仿真实验结果表明：FOLCL滤波器可从根本上避免谐振;所设计的FOLCL滤波器效果明显优于传统的整数阶LCL（IOLCL）滤波器;所建全分数阶逆变并网系统各项指标均明显优于传统方案。

RESEARCH ON GRID-SIDE CONTROL OF WIND POWER GENERATION BASED ON FRACTIONAL LCL FILTER

With the popularization and application of wind power technology, improving the quality of wind power grid-connected power is of great significance to the stability of the power system. In order to improve the quality of grid-connected power, this paper proposes the use of a fractional-order PI （fractional-order PI, λ） controller to achieve grid-side control, and a fractional-order LCL （fractional-order LCL, FOLCL） filter for filtering. Firstly, it is deduced by mathematical theory theory that FOLCL filter can fundamentally avoid the characteristic of resonance. Then a fractional-order mathematical model of the grid-side inverter system is established, and a fractional-order double closed-loop control structure is derived. Finally, the PI^λ controller is introduced on the grid side and its parameters are designed. The experimental simulation results show that of the FOLCL filter can effectively avoid resonance. The effect of the FOLCL filter designed in this paper is significantly better than that of the traditional integer-order LCL （IOLCL） filter. All indicators of the full fractional-step inverter grid-connected system built in this paper are significantly better than that of the traditional schemes.