Risk and Countermeasures of High-Frequency Resonance for Back-to-Back HVDC in Guangdong Power Grid
Shuxin LUO , Ruikuan LIU , Chu JIN , Zhengmin ZUO , Yong LIN , Donghui ZHANG , Qiang ZHOU , Dayang WANG
›› 2023, Vol. 17 ›› Issue (11) : 1 -9.
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Risk and Countermeasures of High-Frequency Resonance for Back-to-Back HVDC in Guangdong Power Grid
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Abstract
After the VSC-HVDC transmission system based on modular multilevel converter (MMC） is connected to the power grid, high-frequency resonance may occur, which further leads to the implementation of blocking logic protection for VSC-HVDC converter station, which will have a serious impact on the AC main grid. Therefore, the study of VSC-HVDC high-frequency resonance and its suppression scheme has a significant role in improving engineering safety and reliability. Firstly, the harmonic impedance of Guangdong Power Grid's planning AC power grid in 2025 is scaned by HISCAN software, and the generalized Nyquist criterion is used to conduct a comprehensive investigation of the high-frequency oscillation risk points in the Guangdong power grid system. Then, the established electromagnetic transient model is used for time-domain simulation to evaluate and validate the high-frequency oscillation of the VSC-HVDC transmission system. Finally, relevant suppression strategies are proposed to address the potential high-frequency resonance points in the system to address the oscillation risk.
Keywords
modular multilevel converter / suppression strategy / high-frequency resonance / VSC-HVDC
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Funding
the Planning Project of Guangdong Power Grid Co., Ltd(031000QQ00200004)
the National Key Research and Development Program of China(2019YFE0111500)
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