Small-signal modeling of LCC-HVDC systems with switching for electromagnetic timescale stability analyses of power systems

JIANG Kezheng; ZHU Jianhang; HU Jiabing; WANG Haijiao

doi:10.16511/j.cnki.qhdxxb.2021.21.011

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Journal of Tsinghua University(Science and Technology) ›› 2021, Vol. 61 ›› Issue (5) : 395-402. DOI: 10.16511/j.cnki.qhdxxb.2021.21.011

SMALL-SIGNAL STABILITY

Small-signal modeling of LCC-HVDC systems with switching for electromagnetic timescale stability analyses of power systems

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Abstract

The wide application of power electronic equipment in power systems has caused significant changes in the dynamic behavior of modern power systems. As an important power system component, line commutated converter based high voltage direct current (LCC-HVDC) systems have an important impact on the safe, stable operation of power systems. Since the switching process in LCC-HVDC systems has intermittent time-varying characteristics and the switching frequency is equivalent to the electromagnetic timescale constant, these intermittent time-varying switching characteristics are the key to the stability of LCC-HVDC systems. This paper presents an electromagnetic timescale, small-signal model for LCC-HVDC systems that includes the switching process with a stability analysis. The model includes the nonlinear characteristics and the inherent periodic time-varying characteristics of LCC-HVDC systems for modeling the key challenges in the control system. Then, linear time-periodic theory is used to develop an electromagnetic timescale, small-signal model of the LCC-HVDC system. Finally, this model is compared with an existing model that does not consider the time-varying characteristics of the switching process to show the influence of the switching on the system stability with the results verified by time-domain simulations.

Key words

line commutated converter based high valtage direct current (LCC-HVDC) / switching process / periodic time-varying / harmonic state space (HSS) / electromagnetic timescale

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JIANG Kezheng, ZHU Jianhang, HU Jiabing, WANG Haijiao. Small-signal modeling of LCC-HVDC systems with switching for electromagnetic timescale stability analyses of power systems[J]. Journal of Tsinghua University(Science and Technology). 2021, 61(5): 395-402 https://doi.org/10.16511/j.cnki.qhdxxb.2021.21.011

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