弱电网下双馈风机LTP状态空间建模分析及改进锁相环控制策略

孔祥龙; 徐海亮; 刘瀚锴; 段玉涵

doi:10.13336/j.1003-6520.hve.20241757

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弱电网下双馈风机LTP状态空间建模分析及改进锁相环控制策略

更新时间：2026-02-02

- 弱电网下双馈风机LTP状态空间建模分析及改进锁相环控制策略
- Vol. 51, Issue 12, Pages: 6001-6009(2025)
- 作者机构：
  
  中国石油大学(华东)新能源学院,青岛,266580
- 作者简介：
- 基金信息：
- DOI：10.13336/j.1003-6520.hve.20241757
  CLC：
- Published：2025
- 稿件说明：
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孔祥龙, 徐海亮, 刘瀚锴, et al. 弱电网下双馈风机LTP状态空间建模分析及改进锁相环控制策略[J]. 2025, 51(12): 6001-6009.
DOI：

孔祥龙, 徐海亮, 刘瀚锴, et al. 弱电网下双馈风机LTP状态空间建模分析及改进锁相环控制策略[J]. 2025, 51(12): 6001-6009. DOI： 10.13336/j.1003-6520.hve.20241757.

摘要

随着新能源接入规模的不断扩大，风电大规模并入弱电网引发的小扰动失稳问题日益突出，然而传统线性时不变理论因忽略周期时变分量，难以准确分析低电压穿越期间双馈风机并网系统的小扰动失稳问题。为解决这一问题，首次构建了DFIG单机并网系统的线性周期时变(linear time-periodic

LTP)小信号模型，并通过状态转移矩阵求解系统的特征指数。基于特征指数的分析，深入研究了锁相环带宽和弱电网短路比对系统稳定性的影响，进而提出了改进的锁相环控制策略。最终，通过仿真和实验验证了理论分析的正确性和所提控制策略的有效性。研究结果表明：所建模型可以准确反映系统的周期时变特性，且所提控制策略能有效提高系统稳定性。

Abstract

Traditional linear time-invariant theory fails to effectively analyze the small-signal instability of grid-connected DFIG systems during low-voltage ride-through due to its neglect of periodic time-varying components. To address this issue

this paper presents a linear time-periodic (LTP) small-signal model for a single DFIG grid-connected system

and derives the system's eigenvalue indices using the state transition matrix for the first time. Based on the analysis of these eigenvalue indices

the impact of phase-locked loop (PLL) bandwidth and short-circuit ratio (SCR) of the weak grid on system stability is investigated

and thus an improved PLL control strategy is put forward. Finally

simulations and experiments verify the correctness of the theoretical analysis and the effectiveness of the proposed control strategy. The research results indicate that the established model can accurately reflect the periodic time-varying characteristics of the system

and the proposed control strategy can effectively improve system stability.

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