Research on grid impedance identification in renewable energy systems based on MLBS signal injection

HAO Yidian; LIU Hao; BI Tianshu

doi:10.19783/j.cnki.pspc.260078

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Research on grid impedance identification in renewable energy systems based on MLBS signal injection

更新时间：2026-10-16

- Research on grid impedance identification in renewable energy systems based on MLBS signal injection
- Power System Protection and Control Vol. 54, Issue 17, (2026)
- 作者机构：
  
  新能源电力系统全国重点实验室 (华北电力大学),北京,102206
- 作者简介：
- 基金信息：
- DOI：10.19783/j.cnki.pspc.260078
  CLC：
- Published：2026
- 稿件说明：
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HAO Yidian, LIU Hao, BI Tianshu. Research on grid impedance identification in renewable energy systems based on MLBS signal injection[J]. Power System Protection and Control, 2026, 54(17).
DOI：

HAO Yidian, LIU Hao, BI Tianshu. Research on grid impedance identification in renewable energy systems based on MLBS signal injection[J]. Power System Protection and Control, 2026, 54(17). DOI： 10.19783/j.cnki.pspc.260078.

摘要

目前，电力系统新能源接入比例日益增大，开展电网宽频阻抗测量对监测电网强度、保障电力系统稳定运行意义重大。然而，现有的电网阻抗测量方法因注入信号频带有限，导致鲁棒性较低，测量精度也有待提高。提出一种基于最大长度二进制序列信号 (maximum length binary sequence

MLBS) 注入的电网侧宽频阻抗辨识方法。设计了一种基于 MLBS 信号的注入方法。MLBS 信号具有频带较宽、时域幅值可控的特性，可为快速获取电网阻抗特性提供基础。通过分析含跟网型和构网型变流器的新能源系统的控制过程，明晰了扰动信号注入位置，使注入信号的时频特性可准确传递至公共连接点 (point of common coupling

PCC)。提出基于 Levenberg‑Marquardt 算法的电网阻抗拟合方法，提高了收敛速度，避免了初值选择不佳时收敛度低的问题，实现了电网阻抗的精确测量。通过系统仿真验证，相比于传统的多正弦信号的注入方法，所提方法不仅提高了电网阻抗测量的频段范围，且对电网谐波和数据异常也具有一定的鲁棒性，精度较高。

Abstract

With the increasing penetration of renewable energy sources into power systems

broadband impedance measurement has become increasingly important for monitoring grid strength and ensuring stable power system operation. However

existing measurement methods generally suffer from limited frequency coverage of injected signals

resulting in insufficient robustness and measurement accuracy. To address these issues

a grid‑side broadband impedance identification method based on maximum length binary sequence (MLBS) signal injection is proposed. First

an MLBS‑based injection scheme is designed. Owning to its wider frequency band and controllable time‑domain amplitude

it provides a basis for fast acquisition of grid impedance characteristics. By analyzing the control process of renewable energy systems with both grid‑following and grid‑forming converters

the injection location of the disturbance signal is determined

ensuring accurate transmission of the signal's time‑frequency characteristics to the point of common coupling (PCC). An impedance fitting method based on Levenberg‑Marquardt is proposed to improve convergence speed and avoid poor convergence caused by inappropriate initial values

thereby achieving accurate grid impedance measurement. System simulation results demonstrate that

compared with the traditional multi‑sinusoidal signal injection method

the proposed method not only improves the frequency band range of impedance measurement but also exhibits certain robustness against grid harmonics and data anomalies

while achieving high measurement accuracy.

关键词

Keywords

references

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