Thank you Yang for offering me your selfless help and guidance on how to carry out modelling, experiments, and writing papers. Thank you, Pierpaolo for advising me and being my mentor once at 1 am, your passion for really affected me. Thank you both for keeping me well on track with the timeline. I wouldn't have accomplished so much so smoothly without any of your help.The past two years at TU Delft have been an amazing adventure for me. I travelled to the Netherlands from China during the worst period of the pandemic and studied from home for the first year. It was a struggling time during the lockdown where all of us had to undergo difficulties and depression. Only in the second year of my Master's study did TU Delft unveil itself and I have a great experience both as a student and as a foreigner. Also, I would like to thank my dear family and friends, and my lovely neighbors at 33F for your love, kindness, and support.
This paper presents the study of a 100kW electric vehicle (EV) fast charger based on a 12-pulse rectifier cascaded with two buck-type DC-DC converters. The proposed circuit operates with a triangular current shaping method which considerably improves the current harmonics performance of the system. The studied circuit is particularly suited for high power battery charging, being relatively simple to operate, requiring a low active semiconductor count (only two active switches), and because it employs circuit technologies well-established in the high power market. Above all, this EV fast charger meets the requirements of isolation, high efficiency, high output voltage and good power quality (low THD and unity power factor). This paper describes in detail the analytical modeling of the studied circuit, including the current harmonic input filter design which meets the grid standard requirement, and the loss modeling of the semiconductors and passive elements. The modeling and simulation results of the proposed 100 kW system are presented and analyzed.
Distributed secondary control is deemed necessary to restore the state of AC micro-grids to set points. However, for its limited global information, the power electronic system is vulnerable to cyber-attacks that aim to desynchronize converters or even cause a shutdown of micro-grids by unnecessarily triggering the protection schemes. To this end, an adaptive communication weight update for the secondary control layer is proposed. It guarantees frequency synchronization and active power sharing despite the presence of these attacks. Moreover, it automatically dispatches optimal communication lines when all its neighboring data are corrupted to different levels. Finally, the efficacy of the proposed resilient control method is demonstrated using simulations.
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