Nonminimum phase compensation in VSC-HVDC systems for fast direct voltage control

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13 Citations (Scopus)


Newly developed VSC-HVDC systems are reaching power levels of up to 1000 MW. At this power level, the nonminimum phase behavior of the VSC-HVDC systems' dc plant becomes a threat to the stability of the direct voltage for fast dc control-loop dynamics. This paper presents a novel compensation scheme, called RHP-zero shifting+damping, designed to deal with the nonminimum phase dynamics of the dc plant by adding additional compensation loops to the current controller of the VSC-HVDC system. The compensation scheme can work along with linear controllers and allows the closed-loop bandwidth of the direct voltage controller to be increased without affecting the direct voltage stability of high-power VSC-HVDC systems. As a result, the direct voltage variations are significantly reduced during power changes in the ac or dc network. The performance of the compensation scheme is evaluated through simulations and corroborated in a 1-kW experimental test bed.

Original languageEnglish
Article number7111331
Pages (from-to)2535-2543
Number of pages9
JournalIEEE Transactions on Power Delivery
Issue number6
Early online date21 May 2015
Publication statusPublished - 31 Dec 2015


  • direct voltage control
  • HVDC transmission
  • nonminimum phase
  • VSC-HVDC systems


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