Feasibility study for electrification of Logistics centre at Stockholm Royal Seaport
Jan 2021 – Aug 2021

In the eastern part of Stockholm, a major urban development project is taking place. It is called Stockholm Royal Seaport and up to the year 2030 approximately 12000 new homes, 35000 workplaces and 600000 square meters of commercial areas will be added to the area. The project has been given a very ambitious environmental action plan. As a part of that, the City of Stockholm has established a logistics centre in the area. The logistics centre is supposed to coordinate all transports of building material and handle the waste during the construction phase. One objective with the logistics centre is to reduce the number of transports and thereby reduction in the use of energy. The thesis work mainly focused on developing an optimisation program for electricity supply to the logistics centre, in order to find the optimal way of managing charging and the use of electrical energy, when the logistics centre has procured a new battery-powered truck. The main objective is to minimize the purchase of power from the grid, for the loads at the logistics centre at Stockholm Royal Seaport. This thesis not only focused on this site in particular, but the work also resulted in creating a benchmark model that could be used for studying the electrification process for other construction sites in general. The logistics centre contains stationary battery storage, electrified distribution trucks, a PV generation system, and other electrical loads at the site. This thesis aimed at considering all the limitations and constraints for all the resources at the site and then finding an optimal method of utilising these resources in order to minimize the overall energy consumption. In this thesis, the optimal sizing of the battery for an electrified distribution truck is also performed considering the overall functional requirements of the distribution truck. Various charging strategies have been identified and simulated to understand the routines of charging the truck and their direct impact on the grid due to the purchase of energy during various hours of the day. The work resulted in optimised use of assets at the site during different hours of the day. The simulation work identified the best strategy and the use of resources at the site thus saving some amount of energy consumption at the site. This directly resulted in saving overall operational costs of the logistics centre.

http://urn.kb.se/resolve?urn=urn%3Anbn%3Ase%3Akth%3Adiva-304264

Design, Monitor and Control of the Solar/Wind hybrid generation with PHCA (Pumped Hydro combined with Compressed air) Energy Storage System
Jul 2017 – Aug 2018

Presently, the main problem is that the major portion of energy demand is met by fossil fuels, which are day by day decreasing. Therefore, the world needs to move on to some kind of sustainable renewable energy generation system that is reliable and cheap. The other main problem with the generation is that the power that is generated must be consumed or stored, otherwise, it will be wasted.

Currently, there are many renewable sources that are sustainable and cost-effective, e.g. solar, wind, and hydel energy. Since hydel energy is location dependent, solar energy is available everywhere but during the daytime, and the wind that is useful for generation is available at certain geographical locations. So, it would be beneficial to rely on more than one renewable energy source to get sustainable power generation. In our country, there are few locations where hydel energy can be harnessed but there are many locations where wind can be harnessed. So, we can choose wind as one energy source. Also, solar energy, which is available everywhere can accompany wind energy during the daytime. To further increase the reliability of the system, there must be a storage system. There are currently, two trending and effective storage system around the world, which are pumped hydro and Compressed air energy storage systems. But, these storage systems need specific geographical locations to get maximum efficiency from them. In China, an energy storage system idea has emerged which combines both pumped hydro and compressed air systems together called PHCA (Pumped Hydro Compressed Air) system to obtain a storage system that is independent of specific geographical location and can be implemented on both small, as well as on a large scale with minimum cost as compared to latter two systems. 

The main purpose of developing this project is to demonstrate the idea and feasibility of the PHCA (Pumped Hydro Compressed Air) storage system when combined with solar and wind generation system.

HVDC breakers in HVDC Grids
Aug 2019 – Nov 2019

The main aim of this project was to study and analyse the HVDC Breaker technology in HVDC transmission system at the Zhangbei Grid China.

Smart Grids Overview
Aug 2019 – Dec 2019

Smart grid technology aims for providing benefits to electricity consumers and producers by fully utilizing the assets of the electric power system. The main aim of this project was to analyse the impacts of adopting smart grid technology in the conventional power system.

Design of a Step-Down (Buck) DC-DC Converter
Aug 2019 – Dec 2019

The objective of this project work was to design a step-down (buck) dc-dc converter according to the given specifications. It was typically done to learn about the design procedure of a power electronic converter. I calculated suitable values for the passive components of the circuit and selected suitable semiconductor devices. The controller design was based on state-space averaging with the so-called K-factor approach. A circuit simulator, OrCAD PSpice, was used for analyzing the final design by means of simulations. The design goal was to achieve a safe converter operation while minimizing manufacturing costs.

Techniques for voltage control in a low voltage (LV) power distribution grid with a significant amount of photovoltaic input.
Aug 2019 – Jan 2020

The power supply from many renewable sources are intermittent and delivers a variable power supply to the grid. A variable power supply will cause a variable voltage in the grid unless it is regulated in some way, but the voltage variations are not permitted to be more than +/- 10%. The consequence of installed power production in places where only power consumption is assumed may cause unwanted effects such as voltage rise about the permitted margins. Furthermore, the overhead lines and cables in the system may be overloaded, which is not permitted.
In this project, I investigated different technologies to control the voltage in an LV distribution grid.

Information, communication and computations in the smart grids
Jan 2020 – Jun 2020

The study involved an analysis of the ICT application, Real-Time data Monitoring in Smart Grid. The real-time monitoring and then taking the step accordingly makes the smart grid more reliable than the traditional grid network. But with the inclusion of these all modern features challenges the engineers to build such a system with high efficiency and reliability. In this project, different ways of real-time data acquisition were analysed.

Energy Management System
Mar 2020 – Jun 2020

Using software techniques I created an embryo of the Energy Management System. The project combined the use of Python programming, CIM-XML modelling and parsing and finally model building using Pandapower.

To use the Machine learning techniques on power system modeling techniques to build the power system structure
Mar 2020 – Jul 2020

It involved modelling of the power grid using PandaPower and then simulation of a time series in this grid to create a dataset of measurements (voltage, power etc) from the modelled grid. The dataset created was used as a base for a machine learning experiment.

Analysis of impacts of increasing intermittent renewable energy on cross-border energy trade with some real-life applications
Aug 2020 – Jan 2021

A stable electric power system needs flexibility in terms of generation and transmission. Increased intermittent energy sources such as wind and solar will hugely affect the system inertia and therefore the stability of the grid. Cross-border energy trade will therefore vary between the states in order to ensure stability between the EU states. Therefore, the main aim of this project will be to explore the impacts of intermittent renewable energy on cross-border energy trade between EU states with the help of statistical data and a power flow model of the EU power network.