PROJECT TITLE: Capacitive DC-Links – Design, Control, and Its Impact on Reliability of Single-Phase Power Electronic Systems
PhD period: 2015.11.15 – 2018.11.14.
Section: Power Electronic Systems
Research Programme: Efficient and Reliable Power Electronics
Supervisor: Huai Wang
Co-Supervisor: Frede Blaabjerg
Funding: Department of Energy Technology, AAU.
In a variety of single-phase applications, the conversion between DC and AC power will typically introduces a low-frequency pulsation power at the DC-Link of the power electronic systems, which is detrimental to the DC side utility of the converter. A simple way to suppress this pulsation power at the DC-Link is passively filtered by the capacitive DC-Links in Voltage Source Converter (VSC). Unfortunately, it has been pointed out that DC-Link E-Caps have been one of the most critical components, and their limited lifetime is not compatible with future warranty for reliable power conversion system. Although there are many existing methods to reduce the total capacitive energy storage requirements and claims, inevitably, these methods maybe also change the electrical and thermal stresses on other components. Whether the reliability of system has been improved quantitatively or not is still an open question.
In order to conduct the design and control of stable and reliable single-phase power electronic systems from system level quantitatively, the objective of this project is making a universal capacitive DC-Link design approach for its parameters selection and circuit implementation by scientific quantification from sizing, cost, stability and reliability.
Publications in journals and conference papers may be found at VBN.