Impact of Filter Inductance on Transient Synchronization Stability of Grid-Connected Systems with Grid-Following Converters Under Voltage Sag Faults

Qianying Mou (), Jingxiu Yuan, Yuhan Wu, Shumin Sun and Jiawei Xing
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Qianying Mou: School of Electrical Engineering, Shandong University, 17923 Jingshi Road, Lixia District, Jinan 250061, China
Jingxiu Yuan: School of Electrical Engineering, Shandong University, 17923 Jingshi Road, Lixia District, Jinan 250061, China
Yuhan Wu: School of Electrical Engineering, Shandong University, 17923 Jingshi Road, Lixia District, Jinan 250061, China
Shumin Sun: Electric Power Research Institute, State Grid Shandong Electric Power Co., Ltd., Jinan 250003, China
Jiawei Xing: Electric Power Research Institute, State Grid Shandong Electric Power Co., Ltd., Jinan 250003, China

Sustainability, 2025, vol. 17, issue 19, 1-17

Abstract: As renewable energy sources become more prevalent, maintaining the sustainable and reliable operation of power systems has become as a major challenge. Modern grid-connected converter systems are particularly prone to losing synchronization when encountering large disturbances, which is a huge threat to the stability of the power grid, which is mainly based on renewable energy. This paper studies the impact of filter inductors on the synchronous stability of grid-connected converter systems, hoping to help us better connect renewable energy to the power grid. First, the existing synchronization stability model of grid-following (GFL) converters is extended by incorporating filter inductance modeling. Based on this model, a mathematical relationship between the phase-locked loop’s (PLL) frequency deviation and the filter inductance at the moment of fault is established, and a predictive method for GFL frequency deviation considering filter inductance is proposed. Furthermore, the impact of filter inductance on synchronization stability is systematically investigated through two key indicators: power angle overshoot and critical fault voltage, revealing the variation trends of transient stability under different operating conditions. Finally, the analytical results are validated through Matlab/Simulink simulations, providing theoretical guidance for the design of sustainable and robust renewable energy grid integration strategies.

Keywords: current transient; filter inductor; grid-following inverters; renewable energy integration; transient stability; sustainable power systems (search for similar items in EconPapers)
JEL-codes: O13 Q Q0 Q2 Q3 Q5 Q56 (search for similar items in EconPapers)
Date: 2025
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