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1887

access icon free Generalised extended-frequency dynamic phasor model of LCC-HVDC systems for electromagnetic transient simulations

© The Institution of Engineering and Technology
Received 28/11/2017, Accepted 22/03/2018, Revised 12/03/2018, Published 28/03/2018

This study introduces a new model for line-commutated converter high-voltage direct current (LCC-HVDC) systems based upon the concept of extended-frequency dynamic phasors (DPs). The proposed model is able to represent LCC-HVDC converters during normal as well as abnormal operating modes such as system imbalances and commutation failure by automatically adjusting its parameters based upon converter terminal quantity measurements. The model offers a high level of accuracy with reduced computational burden, and is suitable as a replacement for conventional switch-based models of LCC in electromagnetic transient (EMT) simulation platforms. The proposed model is thoroughly evaluated against detailed EMT simulations of the CIGRE HVDC benchmark and the IEEE 12-bus systems with an embedded LCC-HVDC link. Simulation results confirm that the proposed DP-based model retains EMT-grade accuracy even at large simulations steps. Significant acceleration ratios reaching up to an order of magnitude are observed in the simulations using the proposed model compared with conventional EMT models.

Inspec keywords: power system transients; HVDC power convertors

Other keywords: CIGRE HVDC benchmark; conventional switch-based models; EMT-grade accuracy; commutation failure; generalised extended-frequency dynamic phasor model; abnormal operating modes; IEEE 12-bus systems; line-commutated converter high-voltage direct current systems; embedded LCC-HVDC link; LCC-HVDC systems; electromagnetic transient simulations; EMT simulation platforms; converter terminal quantity measurements; DP-based model; acceleration ratios; system imbalances; LCC-HVDC converters

Subjects: DC-AC power convertors (invertors); d.c. transmission; AC-DC power convertors (rectifiers)

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