Control, Efficiency Optimization and Fault-Tolerant Operation of High-Frequency-Link DC Microgrid

Due to high efficiency and easy integration of energy storage devices and renewable energy sources (PV and Wind), flexible DC power distribution system has been widely used. As one key component, the DC solid state transformer (SST) with high efficiency for a wide operating range is essential. However, with the traditional phase shift control, high backflow power and current stress will significantly affect the conversion efficiency. In this project, the backflow power characteristics in both sides of SST converters will be comprehensively analyzed. On this basis, complete transmission power, backflow power and peak current mathematical models will be established. Various phase shift modulation (PSM) schemes, consist of the single phase shift (SPSM), symmetric double side phase shift (SDSPSM) and the optimized asymmetric double side phase shift (ODSPSM), are opted for a more in-depth analysis. A 1kW SST converter prototype will be developed with experimental results to verify the analysis.

The candidate should have a first class or upper second class honours degree, or a master’s degree (or equivalent qualification), in power electronics and renewable energy. Evidence of good spoken and written English is essential. The candidate should have an IELTS score of 6.5 or above, or an equivalent qualification, if the first language is not English. This position is open to all qualified candidates irrespective of nationality.