The Extreme Temperature Weather Impact Mechanism Analysis of MMC-HVDC’s Harmonic Impedance and Its Dynamic Stability

Hongling Zhou, Baohong Li (), Qin Jiang, Tianqi Liu, Yingmin Zhang and Yue Yin
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Hongling Zhou: School of Electrical Engineering, Sichuan University, Chengdu 610065, China
Baohong Li: School of Electrical Engineering, Sichuan University, Chengdu 610065, China
Qin Jiang: School of Electrical Engineering, Sichuan University, Chengdu 610065, China
Tianqi Liu: School of Electrical Engineering, Sichuan University, Chengdu 610065, China
Yingmin Zhang: School of Electrical Engineering, Sichuan University, Chengdu 610065, China
Yue Yin: School of Electrical Engineering, Sichuan University, Chengdu 610065, China

Energies, 2024, vol. 17, issue 23, 1-22

Abstract: In recent years, the small-signal stability of modular multilevel converter (MMC)-based high-voltage direct current (HVDC) systems has garnered significant attention. But little attention has been paid to the impact of extreme temperature weather, although it may change the parameters of outdoor devices and lead to oscillations in a weak system. To explore the impact of environmental temperature on the stability of the MMC-HVDC system, this paper firstly establishes a comprehensive harmonic state space (HSS) model, incorporating the effect of temperature on the impedance of AC and DC transmission lines based on the thermal balance equation. By comparing the theoretical and simulation results, the accuracy of the model is validated. Subsequently, the mechanisms through which extreme temperature conditions affect system stability were analyzed. The results indicate that under extreme high-temperature conditions, the impedance of the MMC is significantly affected, weakening system stability and potentially causing small-signal instability. In contrast, extreme low-temperature conditions show no noticeable impact on system stability.

Keywords: extreme weather; modular multilevel converter; harmonic state space (HSS); stability analysis; dual-terminal modular multilevel converter (MMC) system (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2024
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