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Small Signal Analysis of DC Voltage Control Based on a Virtual  Resistance of DC/DC converter Integrated in a Multiterminal DC  Grid 
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  • Ghazala Shafique,
  • Johan Boukhenfouf,
  • Francois Gruson,
  • Shabab Samimi,
  • Frédéric Colas,
  • Xavier Guillaud
Ghazala Shafique
L2EP

Corresponding Author:[email protected]

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Johan Boukhenfouf
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Francois Gruson
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Shabab Samimi
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Frédéric Colas
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Xavier Guillaud
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Abstract

The future multi-terminal direct-current (MTDC) grid will require the interconnection of point-to-point high-voltage (HV) DC links with different specifications such as DC voltage level, system grounding configuration and HVDC technology. To adapt these differences, DC/DC converters are obligatory to interconnect HVDC links. Additionally, they are capable of providing supplementary functionalities as they are highly controllable devices. In this paper, a primary virtual resistance DC voltage controller associated with DC/DC converter is proposed for managing DC grid voltages of the interconnected HVDC grids, increasing the reliability of the system. The commonly known topology, Front-to-Front Modular Multilevel Converter (F2F-MMC) is adopted for DC/DC converter. Time-domain simulations are performed using EMTP software for validating the controller behaviour under power disturbances and large events of loss of one converter in a MMC-based MTDC system. The converters are modelled using reduced order modelling (ROM) methodology. Apart from this, dynamic studies have been carried out using a linear state space model for small-signal stability analysis of a HVDC system integrating DC/DC converter with a virtual resistance DC voltage controller. The results are examined through parametric sensitivity analysis.
26 Jan 2024Submitted to TechRxiv
29 Jan 2024Published in TechRxiv