Impedance Reshaping Method for DFIG Based on Broadband Characteristic of a Cascaded Lagging Compensation PLL

XU Hengshan; CHEN Lei

doi:10.13296/j.1001-1609.hva.2025.11.014

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Impedance Reshaping Method for DFIG Based on Broadband Characteristic of a Cascaded Lagging Compensation PLL

Fault Diagnosis Technology | 更新时间：2025-11-04

- Impedance Reshaping Method for DFIG Based on Broadband Characteristic of a Cascaded Lagging Compensation PLL
- High Voltage Apparatus Vol. 61, Issue 11, Pages: 149-161(2025)
- 作者机构：
- 作者简介：
- 基金信息：
- DOI：10.13296/j.1001-1609.hva.2025.11.014
  CLC：
- Received：20 June 2025，
  
  Revised：2025-08-25，
  
  Published：16 November 2025
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XU Hengshan, CHEN Lei. Impedance Reshaping Method for DFIG Based on Broadband Characteristic of a Cascaded Lagging Compensation PLL[J]. High voltage apparatus, 2025, 61(11): 149-161.
DOI：

XU Hengshan, CHEN Lei. Impedance Reshaping Method for DFIG Based on Broadband Characteristic of a Cascaded Lagging Compensation PLL[J]. High voltage apparatus, 2025, 61(11): 149-161. DOI： 10.13296/j.1001-1609.hva.2025.11.014.

摘要

针对锁相环（phase-locked loop，PLL）与电网强耦合导致双馈风机（double-fed induction generator，DFIG）在弱电网下阻抗失配易引发振荡风险的问题，提出基于串联滞后校正PLL的DFIG阻抗重塑方法。首先，通过建立DFIG阻抗模型并分析其波特图，发现考虑电网阻抗才能准确评估潜在振荡风险。然后，在考虑电网阻抗情况下，将串联滞后校正环节引入PLL以补偿振荡频段相位裕度，并利用全通滤波器校正DFIG工频相位偏移以提升并网稳定性。最后，为验证所提方法的有效性，基于RT-LAB搭建半实物平台，为提高超宽频阻抗扫描效率，提出对数分布多频并行注入法进行阻抗扫描方法，其效率较传统方法提高47.2%；在低短路比下，所提重塑方法可将定子电压

THD

降至38%～48.9%，电流

THD

降至40%～59.6%，其谐波抑制性能优于传统重塑方法。

Abstract

In view of oscillation risk ，which is likely happen due to impedance mismatch of the doubly-fed

induction generator’s（DFIG）in weak grids due to the strong coupling between phase-locked loop（PLL）and grid，an impedance reshaping method of DFIG based on cascaded lagging compensation wideband characteristics of PLL is proposed. First，by setting up the impedance model of the DFIG and analyzing its Bode diagram，it is found that consideration of grid impedance can accurately assess potential oscillation risk. Subsequently，in case of considering grid impedance，a series lag link is introduced to the PLL to compensate the phase margin in the oscillation-prone frequency band. An all-pass filter is also applied to correct the power-frequency phase shift in the DFIG，thereby enhancing grid connection stability. Finally，for validating the effectiveness of the proposed method，a hardware-in-theloop（HIL）platform is set up based on RT-LAB. Moreover，for increasing the efficiency of ultra-wide band impedance scanning，a logarithmically distributed multi-frequency parallel injection method for impedance scanning is proposed，which，compared to conventional methods，improves scanning efficiency by 47.2%. Under conditions of a low short-circuit ratio（

SCR

），the proposed reshaping method reduces the stator voltage

THD

to a range of 38% to 48.9% and the current

THD

to a range of 40% and 59.6%，and its harmonic suppression performance is superior to the traditional reshaping approaches.

关键词

Keywords

references

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