Zhang, Chi


Project title: DC distribution power system

PhD period: 2013.12.01 – 2016.11.30.
Section: Power Electronic Systems
Research Programme: Microgrids
Supervisor: Josep M. Guerrero
Co-Supervisor: Juan Carlos Vasquez
Contact information

Collaborator: China Scholarship Council.
Funding: China Scholarship Council and scholarship from the Dept. of Energy Technology. 


Nowadays more renewable energy resources are emerging in industrial applications. They are clean, sustainable and environmental friendly. Many energy distribution power systems are being established for utilizing these energies efficiently. Since Tesla proved AC’s great advantages over DC in long distance transferring, AC plays a vital role in nearly all the power systems all over the word. In order to transfer these energies to form a distribution power system, power electronic converters are needed to convert all kinds of energy into AC. However, energy sources, such as photovoltaic module, batteries and so on, are naturally DC. So at least two stages are needed to transfer solar energy into the grid and convert back to DC for loads. This double conversion will bring low efficiency and high system cost to distribution power system. Moreover, as for end-users in both everyday life and industry, DC is more attractive choice comparing with AC because of its low cost, high efficiency, super high energy quality and reliability. In DC system, energy quality and management, system reliability and stability must be taken into consideration while more elements also must be stressed in AC system, such as frequency, phase and synchronizing. So recently, DC distribution power system is receiving more and more attentions from both researchers and engineers.

During this Ph.D project, the research will be focused on three basic elements (Fig." of a DC distribution power system shown as follows:

• System Architecture
• Interface Converter Topology and Control
• System modelling
• Control of Overall System

Compared with office building and data centre, residential houses have a more complicated load condition. So to start with, a DC distribution power system intended for residential houses will be investigated (shown in Fig.2) to gain sufficient knowledge of application, which will lay a solid foundation for extending DC distribution power system to other application situations (Office building, data centre etc.). A real DC distribution power system for residential application will be established.


Publications in journals and conference papers may be found at VBN.