Methodology for the analysis of dc-network resonance-related instabilities in voltage-source converter-based multi-terminal HVDC systems
Journal article, 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.
voltage-source convertors
electric admittance
mitigation measures
impedance matrix
negative dc-side susceptance
Z term analysis
converter admittances
HVDC power transmission
Y term analysis
dc-network resonance-related instabilities
HVDC power convertors
dc-network impedance matrix
four-terminal HVDC system
voltage-source converter-based multiterminal HVDC systems
Author
Gustavo Pinares
Power grids and Components
Massimo Bongiorno
Power grids and Components
IET Generation, Transmission and Distribution
1751-8687 (ISSN) 1751-8695 (eISSN)
Vol. 12 1 170-177Subject Categories (SSIF 2011)
Computer Engineering
Telecommunications
Other Electrical Engineering, Electronic Engineering, Information Engineering
Areas of Advance
Energy
DOI
10.1049/iet-gtd.2017.0491