Methodology for the analysis of dc-network resonance-related instabilities in voltage-source converter-based multi-terminal HVDC systems
Artikel i vetenskaplig tidskrift, 2018

A method to investigate dc-network instabilities in multi-terminal high-voltage DC (HVDC) systems is presented. The method consists of defining subsystems, called in this Letter Z and Y, which can be interpreted as a dc-network impedance matrix and as set of converter admittances, respectively. Through the analysis of the Z and Y terms, it is shown that resonances originated from the system's dc network can be amplified if the converters show a negative dc-side conductance. Moreover, it is also shown that converters located at different terminals can contribute to instability if the resonances to which they are exposed are of the same frequency. The analysis method is applied to a four-terminal HVDC system as an example and, using the theory developed in this Letter, mitigation measures are applied. The results are verified through time-domain simulations.

Y term analysis

impedance matrix

Z term analysis

negative dc-side susceptance

electric admittance

mitigation measures

converter admittances

dc-network impedance matrix

HVDC power convertors

voltage-source converter-based multiterminal HVDC systems

four-terminal HVDC system

voltage-source convertors

HVDC power transmission

dc-network resonance-related instabilities


Gustavo Pinares

Elnät och komponenter

Massimo Bongiorno

Elnät och komponenter

IET Generation, Transmission and Distribution

1751-8687 (ISSN) 1751-8695 (eISSN)

Vol. 12 170-177




Annan elektroteknik och elektronik