Control of Voltage Source Converters for Power System Applications
The research work is aimed on the investigation of possible modeling and control schemes for the dc-link of VSC, with the purpose of identifying the impact of such modeling and control on the dynamics of the conversion system. A system consisting of back-to-back converters with equivalent grid interconnection and source representation is designed in the software PSCAD/EMTDC using a detailed switching model of the inverter and rectifier components. The control technique based on the well-established concept of vector control is implemented. The main task of the master thesis is oriented towards the achievement of more reliable dc-link dynamics with smaller required capacitance. The control algorithm is based on balancing the power between inverter and rectifier through the dc-link with the minimum dc voltage variations. Dc-link voltage regulation is achieved by implementing a control based on the energy stored in the dc-link capacitor. Alignment to a dq synchronous reference frame orientation with PI regulators is used in the control philosophy for decoupling purposes.
Place, publisher, year, edition, pages
Institutt for elkraftteknikk , 2011. , 67 p.
ntnudaim:6350, MSELPOWER Master of Science in Electric Power Engineering,
IdentifiersURN: urn:nbn:no:ntnu:diva-14370Local ID: ntnudaim:6350OAI: oai:DiVA.org:ntnu-14370DiVA: diva2:452318
Molinas, Marta, Professor