[HTML][HTML] Grid capacity and efficiency enhancement by operating medium voltage AC cables as DC links with modular multilevel converters

A Shekhar, E Kontos, L Ramírez-Elizondo… - International Journal of …, 2017 - Elsevier
It is anticipated that with the thrust towards use of clean energy resources such as electric
vehicles, future distribution grids will face a steep increase in power demand, forcing the …

DC microgrid islands on ships

A Shekhar, L Ramírez-Elizondo… - 2017 IEEE Second …, 2017 - ieeexplore.ieee.org
Since shipboard power systems are inherently islanded and consist of energy intensive
sources and loads, it is an interesting application for dc microgrids. The object of this paper …

Impact of DC voltage enhancement on partial discharges in medium voltage cables—An empirical study with defects at semicon-dielectric interface

A Shekhar, X Feng, A Gattozzi, R Hebner, D Wardell… - Energies, 2017 - mdpi.com
A scientific consensus is emerging on the benefits of direct current (DC) distribution in
medium voltage (MV) power systems of ships and cities. At least 50% space savings and …

Flexible medium voltage DC source utilizing series connected modular multilevel converters

M Utvić, S Milovanović, D Dujić - 2019 21st European …, 2019 - ieeexplore.ieee.org
This paper presents the converter configuration acting as a medium voltage DC source. In
order to obtain desired voltage across the DC terminals, two series connected modular …

Reconfigurable dc links for restructuring existing medium voltage ac distribution grids

A Shekhar, L Ramírez-Elizondo, X Feng… - Electric Power …, 2017 - Taylor & Francis
While the scientific community recognizes the benefits of DC power transfer, the distribution
network operators point out the practical and economic constraints in refurbishing the …

Ac distribution grid reconfiguration using flexible dc link architecture for increasing power delivery capacity during (n-1) contingency

A Shekhar, E Kontos… - 2017 IEEE Southern …, 2017 - ieeexplore.ieee.org
A practical issue faced by today's ac grid is the rapidly growing power demand on its aging
infrastructure. One possibility to maximize the capacity of the existing infrastructure is to …

Reliability, efficiency and cost trade-offs for medium voltage distribution network expansion using refurbished ac-dc reconfigurable links

A Shekhar, L Ramírez-Elizondo… - … Symposium on Power …, 2018 - ieeexplore.ieee.org
The role of MVDC links for distribution network expansion is important. The distribution
network operators (DNOs) can maximize the power transfer capacity of existing grid …

Thermal modelling and experimental validation for research on medium voltage DC cables

A Shekhar, X Feng, R Hebner… - 2017 IEEE Power & …, 2017 - ieeexplore.ieee.org
The thermal behavior of medium voltage dc cables can find useful applications for efficient
and capacity enhanced operation in cities as well as compact power transmission on all …

Weakly meshing the radial distribution networks with power electronic based flexible dc interlinks

A Shekhar, TB Soeiro… - 2019 IEEE Third …, 2019 - ieeexplore.ieee.org
Flexible dc interlinks can be used for compact and efficient active power redirection by
creating a meshed structure in existing radial distribution network. It is shown that with …

Modular multilevel converter performance with dynamic mvdc distribution link voltage rating

A Shekhar, L Ramírez-Elizondo, Z Qin… - 2018 IEEE 18th …, 2018 - ieeexplore.ieee.org
Back-to-back Modular multilevel converters (MMC) for medium voltage dc (MVDC)
distribution link applications offer exciting opportunities due to its superior harmonic …