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A methodology for the analysis of dc-network resonance-related instabilities in VSC-based multi-terminal HVDC systems

Gustavo Pinares (Institutionen för elektroteknik, Elkraftteknik) ; Massimo Bongiorno (Institutionen för elektroteknik, Elkraftteknik)
IET Generation, Transmission & Distribution (1751-8687). p. 8. (2017)
[Artikel, refereegranskad vetenskaplig]

A method to investigate dc-network instabilities in multi-terminal HVDC systems is presented. The method consists of defining subsystems, called in this paper 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 susceptance. 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 paper, mitigation measures are applied. The results are verified through time-domain simulations.

Nyckelord: HVDC grids, VSC, stability, negative conductance



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Denna post skapades 2017-08-18. Senast ändrad 2017-08-19.
CPL Pubid: 251293

 

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Institutioner (Chalmers)

Institutionen för elektroteknik, Elkraftteknik

Ämnesområden

Energi
Elkraftteknik

Chalmers infrastruktur