Developing a harmonic power flow software in distributed generation systems
Independent thesis Advanced level (professional degree), 20 credits / 30 HE creditsStudent thesis
The main topic of this thesis is harmonic power flow and its use in a simulation software that I have developped. The idea of the software is to combine distribution grids' description, non-linear load models and power flow methods. Nowadays, power electronics is more and more present in electric devices in distributed generation systems. Those power electronics systems can emit or absorb harmonics that can damage the devices in the grid. Thus, it is important to be able to estimate harmonic behaviour in the grid in order to be able to prevent the possible problems that could occur.The main contribution of this internship is the precise expression of the needs and goals of the software, and an implementation of its structure. In this thesis, It is explained howthe grid's components and non-linear devices are modelled in the software in order to beable to represent the distribution system. There is also a study the possible input of this software and create a symbolic representation of the grid that is helpful when it comes toload flow calculation. Then, the different load flow and harmonic load flow algorithms that are presented in the literature are analysed and compared them together in order to determine the methods that should be implemented in the future software.Two of the implemented fundamental load flows with a single-phase system are tested.Thus, it also validates the input reading and the grid representation construction. The software developped is a first implementation of a more global software that will require further studies. Indeed, the developpement stage will be done by external contractors or computer science specialists, that will insist on parallelization of algorithms and software optimization, in order to have a software as efficient and fast as possible.
Place, publisher, year, edition, pages
2012. , 59 p.
EES Examensarbete / Master Thesis, XR-EE-ES 2012:011
Electrical Engineering, Electronic Engineering, Information Engineering
IdentifiersURN: urn:nbn:se:kth:diva-103181OAI: oai:DiVA.org:kth-103181DiVA: diva2:558808
Master of Science in Engineering - Electrical Engineering
Söder, Lennart, Professor