发电技术 ›› 2024, Vol. 45 ›› Issue (6): 1135-1145.DOI: 10.12096/j.2096-4528.pgt.23076

• 新能源 • 上一篇    

基于改进线性自抗扰控制器的直驱风机次同步振荡抑制及阻抗稳定性分析

任蓓蕾1, 郭昆丽1, 蔡维正2, 李博浩1, 朱婷华1, 李玲陶1   

  1. 1.西安工程大学电子信息学院,陕西省 西安市 710048
    2.国网四川省电力公司乐山供电公司,四川省 乐山市 614000
  • 收稿日期:2023-09-23 修回日期:2024-01-08 出版日期:2024-12-31 发布日期:2024-12-30
  • 通讯作者: 郭昆丽
  • 作者简介:任蓓蕾(1999),女,硕士研究生,从事新能源并网次同步振荡研究,Renblnn@163.com
    郭昆丽(1974),女,硕士,副教授,从事电力系统运行与控制技术研究,本文通信作者,guokunli@xpu.edu.cn
  • 基金资助:
    陕西省自然科学基础研究计划项目(2023-JC-QN-0391)

Subsynchronous Oscillation Suppression of Direct-Drive Wind Turbines Based on Improved Linear Active Disturbance Rejection Control and Analysis of Impedance Stability

Beilei REN1, Kunli GUO1, Weizheng CAI2, Bohao LI1, Tinghua ZHU1, Lingtao LI1   

  1. 1.School of Electronics and Information, Xi’an Polytechnic University, Xi’an 710048, Shaanxi Province, China
    2.State Grid Sichuan Electric Power Company, Leshan 614000, Sichuan Province, China
  • Received:2023-09-23 Revised:2024-01-08 Published:2024-12-31 Online:2024-12-30
  • Contact: Kunli GUO
  • Supported by:
    Natural Science Basic Research Program of Shaanxi Province(2023-JC-QN-0391)

摘要:

目的 针对弱电网背景下直驱风机网侧电流内环PI控制器带宽影响并网系统稳定性,诱发次同步振荡(subsynchronous oscillation,SSO)现象,提出改进线性状态误差反馈(linear state error feedback,LSEF)控制律的线性自抗扰控制器(linear active disturbance rejection control,LADRC)替换电流内环的PI控制器去抑制SSO。 方法 首先,对LADRC控制器的LSEF进行改进,并对其跟踪误差、抗扰性能进行分析。然后,推导出计及频率耦合影响的系统阻抗模型,并且利用Nyquist判据分析线路阻抗值对于网侧变流器并网系统稳定性的影响。最后,通过PSCAD/EMTDC仿真软件进行分析验证。 结果 相较于传统LADRC,改进LADRC使直流侧电压波动范围减少了85%,有功功率波动范围减少了89%。 结论 与传统LADRC控制器相比,改进LADRC控制器可以更好地缩小功率波动范围及直流侧电压波动范围,减小跟踪误差。

关键词: 风电, 次同步振荡(SSO), 线性自抗扰控制器(LADRC), 阻抗模型, 直驱式风机, 弱电网, 并网

Abstract:

Objectives In response to the impact of the bandwidth of the current inner loop PI controller on the stability of the grid connected system of direct drive wind turbines under the background of weak electricity network, which leads to the induction of sub synchronous oscillation (SSO) phenomenon, a linear active disturbance rejection control (LADRC) was proposed to replace the current inner loop PI controller with an improved linear state error feedback control law (LSEF) to suppress SSO. Methods Firstly, the LSEF of the LADRC controller was improved, and the tracking errors and anti-interference capabilities were studied. Moreover, an impedance model for the system considering frequency coupling effects was developed, and the Nyquist criterion was employed to assess the impact of line impedance values on the stability of the grid-connected converter system. Finally, the analysis and validation were performed using PSCAD/EMTDC simulation software. Results Compared with traditional LADRC, the improved LADRC can reduce the DC side voltage fluctuation range by 85% and the active power fluctuation range by 89%. Conclusions Compared with traditional LADRC controllers, improved LADRC controllers can better reduce the range of power fluctuations, DC side voltage fluctuations, and tracking errors.

Key words: wind power, subsynchronous oscillation (SSO), linear active disturbance rejection control (LADRC), impedance model, direct-drive wind turbine, weak grid, connection to grid

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