Ludvig Andersson, Elektroteknik

​Titel: Active distribution networks and their impact on the transmission system
Supervisors: Emil Hillberg, Mattias Persson and Stefan Stankovic (RISE)
Examiner: Peiyuan Chen
Opponents: Viktor Larsson and Tim Haagensen
In order to minimize greenhouse gas emissions, traditional power production is being replaced by renewable power sources in power systems across the world. In order to maximize the use of variable renewable energy sources, new methods of managing demand to match the available generation are subject to research. 

Simultaneously, transmission network stability is projected to worsen over the coming decades partly caused by the decommission of large amounts of synchronous generators. In this thesis, a local distribution network control system is studied to determine how it impacts the transmission network in case of contingencies. The control system is intended to allow for further integration of renewable generation in radial distribution networks, and utilizes active power control to prevent overcurrent and overvoltages in the distribution network. A radial distribution network is modelled and integrated into the IEEE Nordic transmission network model. A previously developed control system is modified to handle a greater range of contingencies, and modified to function with the power system simulation software PSS/E. A number of contingencies in the transmission network are combined with different generation scenarios in the distribution network. Simulations are conducted using a semi-static simulation methodology based on load flow studies.

The results imply that the distribution networks under local control can provide indirect mitigation of voltage deviations in the overlying network in case of contingencies. However, this mitigation is dependent on the ability to regulate the active power setpoints of the loads in the distribution network. On load tap changers of the transformers connecting the distribution network to the overlying network improve the voltage stability in the distribution networks, while reducing the amount of voltage support provided to the overlying network. There are a number of assumptions made regarding the technical characteristics of active power control in distribution networks that have a large impact on the results. Further studies into the concept of demand side management are suggested to determine the capabilities of active power regulation.

Ludvig, Emil, Mattias, Stefan and Peiyuan
Password: 772359
Kategori Studentarbete
Plats: Online
Tid: 2022-02-01 15:00
Sluttid: 2022-02-01 16:00

Sidansvarig Publicerad: to 20 jan 2022.