Analysis Method and Control Strategy for Transient Synchronous Stability of Grid-connected New Energy Resources System Considering Current Dynamics During LVRT

LU Yan; SONG Xiaohui; SHENG Wanxing; GAO Fei; LIU Jinjie

doi:10.13335/j.1000-3673.pst.2024.1107

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Analysis Method and Control Strategy for Transient Synchronous Stability of Grid-connected New Energy Resources System Considering Current Dynamics During LVRT

更新时间：2026-03-13

- Analysis Method and Control Strategy for Transient Synchronous Stability of Grid-connected New Energy Resources System Considering Current Dynamics During LVRT
- Vol. 49, Issue 11, Pages: 4556-4567(2025)
- 作者机构：
  
  中国电力科学研究院有限公司, 北京市海淀区,100192
- 作者简介：
- 基金信息：
- DOI：10.13335/j.1000-3673.pst.2024.1107
  CLC： TM712
- Published：2025
- 稿件说明：
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LU Yan, SONG Xiaohui, SHENG Wanxing, et al. Analysis Method and Control Strategy for Transient Synchronous Stability of Grid-connected New Energy Resources System Considering Current Dynamics During LVRT[J]. 2025, 49(11): 4556-4567.
DOI：

LU Yan, SONG Xiaohui, SHENG Wanxing, et al. Analysis Method and Control Strategy for Transient Synchronous Stability of Grid-connected New Energy Resources System Considering Current Dynamics During LVRT[J]. 2025, 49(11): 4556-4567. DOI： 10.13335/j.1000-3673.pst.2024.1107.

摘要

大扰动下新能源的锁相环可能无法跟踪电网电压，发生暂态同步失稳。现有的新能源并网系统的暂态同步稳定分析通常基于输出电流恒定的假设，忽略了故障期间低电压穿越(low voltage crossing，LVRT)过程电流时变的影响，所得到的暂态稳定性评估结果不准确。为此，该文建立了计及LVRT期间新能源电流动态的锁相环模型，并将其类比为等效转子，LVRT控制作用下输出电流的变化可被理解为调节等效原动机功率。采用李雅普诺夫法揭示了新能源暂态同步稳定机理，研究了低穿系数、网侧阻抗和网侧电压跌落程度等不同参数对暂态稳定的影响规律。提出了低电压穿越期间的优化控制策略，提升了弱电网下新能源并网系统的暂态稳定性。最后，基于Matlab/Simulink的电磁暂态仿真结果验证了分析结果和所提控制的有效性。

Abstract

Under significant disturbance

the phase-locked loop of new energy may be unable to track the grid voltage

and transient synchronous instability may occur. The existing transient synchronous stability analysis of new energy is usually based on the assumption of constant output current

ignoring the influence of current change during the low voltage crossing (LVRT) process during the fault

and the transient stability evaluation results have great errors. Therefore

this paper establishes a PLL model that considers the change of new energy output current during LVRT

and compares it to an equivalent rotor. The output current change under LVRT control can be understood as adjusting the equivalent prime mover power. Lyapunov method is used to reveal the mechanism of new energy transient synchronous stability

and the influence of different parameters such as low penetration coefficient

grid side impedance and grid side voltage drop degree on the transient stability is studied. An optimal control strategy during low voltage crossing is proposed

which improves the transient stability of new energy in weak current network by reducing the equivalent prime mover power. Finally

the electromagnetic transient simulation based on Matlab/Simulink verifies the analysis results and the effectiveness of the proposed control.

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