PHD candidate

Kaveh Pouresmaeil

About me

I am fueled by my passion for understanding hows and whys. I have a penchant for conducting research in my multi-disciplinary field of interest, Power Electronics, which gives me freedom to be creative, to be challenged and, above all, to learn. I come from Tabriz, a beautiful city with snowy winters in the northwest of Iran. I live together with my wife. Spending time with my family and hiking in nature are among the activities I like to do in my leisure time.

Personal Motivation

Our blue planet might be the singular planet supporting life among the billions and billions of planets, and life on that sounds to be a lucky fluke. However, environmental issues like global warming put all kinds of life under urgent threat.  Based on reports, we should take real measures, “now or never.” So, how lucky I am that I work in a flied which is one of the main enablers in green technologies like EVs. Hence, my academic background and research experience in Power Electronics guide me that if I want to have a major contribution in my filed of interest, the best option for me can be to work on developing high-performance power electronic solutions for green technologies. In this regard, NEON provides students like me with a golden opportunity to continue our journeys toward our academic and long-term dreams.

MV-connected ultrafast chargers

High-power chargers are essential to charge electric vehicles with large battery capacities. These chargers should be connected to medium voltage grid, as they can cause low voltage grid excessive loading. Traditionally, bulky LF transformers provide the galvanic isolation and interface medium voltage to low voltage level which can be handled by available power switches. Since the relative size of the transformer is reversely proportional to its operating frequency, the large LF transformer can be replaced by a smaller MF transformer. First, there should be a power electronics interface to convert LF MV to MF MV, while limited blocking voltage of power switches is prohibitive. Eighter series connection of semiconductors or multi-cell solutions can be employed to withstand MV. Nonetheless, multi-cell solutions have been adopted more as a result of lower harmonic content. The power electronics interface can be either single-stage (AC/AC) or two-stage (AC/DC-DC/AC). Single stage interface is preferred in size/cost-constrained applications, and those which need no MV DC-link. The conventional way to implement single-stage (AC/AC) stage is to use cascade cells (active bridges), each of which is connected to a MF transformer. However, it decreases the power density of system, since the limited blocking voltage capability of the cell determines the number of cells and, therefore, the number of MF transformers. It should be considered that, despite the number of cells and their blocking voltage, the insulation distance of each transformer should be kept constant. One alternative we are working on is to employ (3-ph AC/ 1-ph AC) modular multi-level converter connected to one or a few more MF transformers, which can decrease the cost and improve the power density of the system. Achievements in this sector can eliminate some of the existing barriers to EV industry development, thereby paving the way for “zero emission energy and mobility.”

Link to other neon research

  • Storage for peak-shaving for wind and PV generation and energy demand (WP1+3)
  • Interaction with industrial markets and aggregators (WP3)
  • Planning and requirements for ultrafast charging of truck and ships at Smart Hubs (WP6)
  • Insight in societal, legal and environmental bottlenecks and how to mitigate them (WP7+8)
  • Standardization of charging and grid interactions (WP8)
  • Contribute reduced order charger model to integral model (WP10)