Transient synchronous stability analysis and enhancement control strategy of a PLL-based VSC system during asymmetric grid faults

Yi Luo; Jun Yao; Zhaoyang Chen; Sen Huang; Shiyue Chen; Qi Zhang; Zhentao Qin

doi:10.1186/s41601-023-00302-0

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Transient synchronous stability analysis and enhancement control strategy of a PLL-based VSC system during asymmetric grid faults

Original Research | 更新时间：2026-09-30

- Transient synchronous stability analysis and enhancement control strategy of a PLL-based VSC system during asymmetric grid faults
- Transient synchronous stability analysis and enhancement control strategy of a PLL-based VSC system during asymmetric grid faults
- 现代电力系统保护与控制（英文） 2023年8卷第2期页码：1-17
- 作者机构：
  
  1. State Key Laboratory of Power Transmission Equipment and System Security and New Technology, School of Electrical Engineering, Chongqing University,Chongqing,China
  2. State Grid Changzhou Power Supply Company,Changzhou,China
- 作者简介：
- 基金信息：
- DOI：10.1186/s41601-023-00302-0
  中图分类号：
- 纸质出版：2023-04-01
- 稿件说明：
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Yi Luo, Jun Yao, Zhaoyang Chen, 等. Transient synchronous stability analysis and enhancement control strategy of a PLL-based VSC system during asymmetric grid faults[J]. 现代电力系统保护与控制（英文）, 2023,8(2):1-17.

Yi Luo, Jun Yao, Zhaoyang Chen, et al. Transient synchronous stability analysis and enhancement control strategy of a PLL-based VSC system during asymmetric grid faults[J]. Protection and Control of Modern Power Systems, 2023, 8(2): 1-17.
Yi Luo, Jun Yao, Zhaoyang Chen, 等. Transient synchronous stability analysis and enhancement control strategy of a PLL-based VSC system during asymmetric grid faults[J]. 现代电力系统保护与控制（英文）, 2023,8(2):1-17. DOI： 10.1186/s41601-023-00302-0.

Yi Luo, Jun Yao, Zhaoyang Chen, et al. Transient synchronous stability analysis and enhancement control strategy of a PLL-based VSC system during asymmetric grid faults[J]. Protection and Control of Modern Power Systems, 2023, 8(2): 1-17. DOI： 10.1186/s41601-023-00302-0.

摘要

The stability of a voltage source converters (VSC) system based on phase-locked loop (PLL) is very important issue during asymmetric grid faults. This paper establishes a transient synchronous stability model of a dual-sequence PLL-based VSC system during low voltage ride-through by referring to the equivalent rotor swing equation of synchronous generators. Based on the model

the synchronization characteristics of the VSC system under asymmetric grid faults are described

and the interaction mechanisms

as well as the transient instability phenomena of positive and negative sequence PLL during asymmetric faults are explained. Using the equal area criterion

the influences of sequence control switching action

detection delay

and interaction between the positive and negative sequence PLL on the transient synchronous stability of the VSC system are analyzed

respectively. In addition

a transient stability assessment criterion based on the critical fault clearance angle and time and an enhancement control strategy based on the improved positive and negative sequence PLL are proposed. Finally

the analytical results are validated through simulation and experiments.

Abstract

the synchronization characteristics of the VSC system under asymmetric grid faults are described

and the interaction mechanisms

as well as the transient instability phenomena of positive and negative sequence PLL during asymmetric faults are explained. Using the equal area criterion

the infuences of sequence control switching action

detection delay

and interaction between the positive and negative sequence PLL on the transient synchronous stability of the VSC system are analyzed

respectively. In addition

the analytical results are validated through simulation and experiments.

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