Journal
IET GENERATION TRANSMISSION & DISTRIBUTION
Volume 12, Issue 12, Pages 3061-3069Publisher
INST ENGINEERING TECHNOLOGY-IET
DOI: 10.1049/iet-gtd.2017.1875
Keywords
HVDC power convertors; power system transients; generalised extended-frequency dynamic phasor model; LCC-HVDC systems; electromagnetic transient simulations; line-commutated converter high-voltage direct current systems; LCC-HVDC converters; abnormal operating modes; commutation failure; system imbalances; converter terminal quantity measurements; conventional switch-based models; EMT simulation platforms; CIGRE HVDC benchmark; IEEE 12-bus systems; embedded LCC-HVDC link; DP-based model; EMT-grade accuracy; acceleration ratios
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Funding
- University of Manitoba
- Manitoba HVDC Research Centre, MITACS PhD Accelerate program
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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.
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