LI Zhiyu, LI Huan, WEI Wei, LIU Chongru. LCC-HVDC Small Signal Modeling Method Considering Voltage Variation[J]. Modern Electric Power, 2022, 39(3): 262-269. DOI: 10.19725/j.cnki.1007-2322.2021.0116
Citation: LI Zhiyu, LI Huan, WEI Wei, LIU Chongru. LCC-HVDC Small Signal Modeling Method Considering Voltage Variation[J]. Modern Electric Power, 2022, 39(3): 262-269. DOI: 10.19725/j.cnki.1007-2322.2021.0116

LCC-HVDC Small Signal Modeling Method Considering Voltage Variation

  • In the analysis on small signal stability of line commutated converter high voltage direct current (abbr. LCC-HVDC) power transmission system, there were such shortages as low accuracy of small signal model and the analysis result could not provide reference for stable operation of power transmission. For this reason, a small signal modeling method, which took dynamic process of voltage into account, was proposed to improve the state-space model of LCC-HVDC system and to revise the angle relationship inside the inverted side converter station as well as the expression of trigger angle. A new state equation considering the dynamic process of voltage was led in the model, and based on this model the stability domain of control parameters for system operation was calculated. The proposed model was verified by PSCAD electromagnetic transient simulation and the obtained results were compared with that by traditional small signal model. Comparison results show that established small signal model possesses higher precision and the analysis results for small signal stability by the proposed model are of higher precision.
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