基于虚拟电阻的双馈风机次同步振荡分数阶PI控制
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TM712

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云南省基础研究计划资助项目(202101AU070015)


Virtual resistance-based fractional-order PI control strategy for sub-synchronous oscillation in doubly-fed wind turbines
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    摘要:

    针对传统方法抑制双馈风机经不同串补电容并网引发的次同步振荡效果不佳的问题,文中提出一种基于虚拟电阻的风机分数阶比例-积分(FOPI)控制策略。首先,分析风电系统次同步振荡发生机理,并以风机并网电流为输入信号设计宽频带次同步电流滤波器,构建出虚拟电阻控制器以增强系统电气阻尼;之后,利用Oustaloup算法改进分数阶积分算子,以网侧变流器控制方程为底层模型重构FOPI电流控制环,分析积分阶次对电流跟踪动态特性的影响;然后,通过引入非线性迭代权重以及学习因子改进传统灰狼优化算法,优化控制策略参数;最后,利用Matlab/Simulink搭建仿真验证模型,结果表明所提策略能有效抑制不同串补度下的次同步振荡,表现出较强的鲁棒稳定性。

    Abstract:

    Aiming at the ineffective suppression results of sub-synchronous oscillation under grid connection of doubly-fed wind turbines process with traditional method,a virtual resistance-based fractional-order proportional integral (FOPI) control strategy is proposed. Firstly,the sub-synchronous oscillation mechanism of wind power systems is analyzed,and the grid-connected current of the wind turbine is selected as the input signal to design the sub-synchronous broadband current filter. To improve the electrical damping of the wind turbine system,a virtual resistance controller is constructed. After that,the influence of the integral order on the dynamic characteristics of current tracking is analyzed. Where the fractional integral operator is improved by employing Oustaloup algorithm,and the FOPI current control loop is reconstructed by choosing the grid-side converter's control equation as the bottom model. Then,the non-linear iterative weights and learning factors are introduced to improve the traditional gray wolf algorithm,as well as optimize the parameters of control policy. Finally,the simulation verification is carried out under Matlab/Simulink platform. The results show that the proposed strategy can suppress the sub-synchronous oscillation effectively under different compensation levels and exhibit strong robust stability.

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刘志坚,刘杰,李鹏程,自超,梁宁.基于虚拟电阻的双馈风机次同步振荡分数阶PI控制[J].电力工程技术,2022,41(5):12-20

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  • 收稿日期:2022-04-25
  • 最后修改日期:2022-07-19
  • 录用日期:2021-11-29
  • 在线发布日期: 2022-09-21
  • 出版日期: 2022-09-28