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Impedance Analysis of Modular Multi-level Converters Connected to Weak AC Grids

Javad Khazaei ; Mebtu Beza (Institutionen för elektroteknik, Elkraftteknik) ; Massimo Bongiorno (Institutionen för elektroteknik, Elkraftteknik)
IEEE Transactions on Power Systems (0885-8950). (2017)
[Artikel, refereegranskad vetenskaplig]

This paper investigates the stability of a modular multi-level converter (MMC)-based HVDC system connected to a weak ac grid. Impedance analysis is used to study the interactions between the weak ac grid and the converter. For this, the impedance of the MMC is first derived considering various outer- and inner-loop controllers. The Nyquist-stability criterion is then used to analyze the stability of the MMC connected to the weak ac grid for various case studies. The impact of circulating current controller on the stability of the MMC connected to the weak ac grid is also validated for two different types of outerloop controllers. Finally, time-domain simulations are carried out using MATLAB/Simscape Power System toolbox to validate the analytical results.

Nyckelord: Modular Multi-level Converter (MMC), Weak ac Grid, Proportional Resonant Control, Short Circuit Ratio (SCR)



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Denna post skapades 2017-12-07.
CPL Pubid: 253629

 

Institutioner (Chalmers)

Institutionen för elektroteknik, Elkraftteknik

Ämnesområden

Energi
Hållbar utveckling
Elkraftteknik

Chalmers infrastruktur