Analysis of Sub-synchronous Torsional Vibration of Wind-Thermal Bundling  Transmission System via LCC-HVDC

doi:10.11930/j.issn.1004-9649.202302060

Abstract

Abstract: In recent years, wind energy resources are strongly developed, and wind-fire bundling via direct current (DC) transmission has become the main method of current and future development and utilization in China. The influence law of permanent magnet synchronous generator (PMSG) cluster and high voltage direct current (HVDC) transmission on the electrical damping of various torsional vibration modes of shaft system of synchronous generators (SGs) needs to be further studied. In this paper, the linear model of the PMSG cluster, thermal power unit, and HVDC system is established. The interactive coupling relationship between access equipment and thermal power unit’s electrical damping and the mechanism of torsional vibration of the shaft system of the thermal power unit caused by wind-fire bundling via DC transmission system are analyzed. Based on the complex torque coefficient method, the influence of PMSG operating wind speed, control parameters, DC transmission power, and other factors on the electrical damping coefficient of SGs is studied. Finally, a time-domain simulation model for wind-fire bundling via DC transmission system is built in PSCAD/EMTDC, and the validity of the analysis results of the electrical damping coefficient is verified by time-domain simulation and time-frequency analysis.

Key words: wind-thermal bundling, PMSG, DC transmission, torsional vibration of shaft system, complex torque coefficient method

ZHAO Yue, YAN Gangui, WANG Zhenyang, REN Shuang, WANG Dazhong, GUO Jianyu. Analysis of Sub-synchronous Torsional Vibration of Wind-Thermal Bundling Transmission System via LCC-HVDC[J]. Electric Power, 2023, 56(6): 18-30.

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URL: https://www.electricpower.com.cn/EN/10.11930/j.issn.1004-9649.202302060

https://www.electricpower.com.cn/EN/Y2023/V56/I6/18

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Analysis of Sub-synchronous Torsional Vibration of Wind-Thermal Bundling Transmission System via LCC-HVDC

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