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RMIT University

1. Riedel, J. On frequency domain analysis of dual active bridge dc-dc converters.

Degree: 2017, RMIT University

Modern society uses electrical energy for a wide range of needs and requirements. Electrical energy is considered high value as it requires a prior conversion step from kinetic/thermal or solar energy. However, electrical power is always defined by certain properties which typically need to be adjusted in multiple stages to satisfy the specifications of electrical loads such as motors, lighting and consumer electronics. For DC (direct current) power systems, switching DC-DC power converters are the state-of-the-art solution to achieve a low-loss modification of the voltage magnitude. The Dual Active Bridge (DAB) converter is an attractive DC-DC conversion topology that can widely satisfy the future needs of DC power management and the integration of electro-chemical storage. It offers an unmatched capability to transfer energy in either direction between two DC sources while its inherent Zero Voltage Switching capability offers potential for high conversion efficiency and high power density. The current and future research activities on DAB converters mainly focus on maximising the power density through a volume reduction of the embedded passive power devices. This trend is encouraged by the market introduction of wide bandgap fast-switching semiconductor devices using Silicon Carbide (SiC) and Gallium-Nitride (GaN) to replace conventional Silicon material in many applications. The reduced parasitic capacitance and transition time of these devices allow to significantly increase the converter operating frequencies, which is the only way to increase the power density unless the material specifications of passive power devices drastically evolve. However, a higher operating frequency inevitably leads to a stronger influence of practical second-order effects, which for a DAB, particularly address the non-ideality of the switch devices, the parasitic coupling impedances in the high-frequency transformer, the peripheral connecting traces of the AC link network and the DC bus filter. Hence, all these effects have to be accommodated by a universal design framework which is yet to be found in literature. A DAB is conventionally designed using time domain analysis of the modulation sequence and device waveforms to evaluate its key performance design criteria such as active power transfer, Zero Voltage Switching (ZVS) and AC link circulating power. This analysis technique typically presumes an idealized single parameter AC link inductance to substitute for the more complex circuit model of a practical high-frequency transformer. This becomes particularly relevant as the operating frequencies increase, causing both active and passive power devices to become less ideal. More than that, advanced multi-level DAB Phase Shifted Square Wave (PSSW) modulation strategies lead to a wide solution space of control parameters that can be used to enhance the performance of a DAB by shaping the AC link current in certain ways. Within the time domain, such volatile modulation strategies require a complicated structure model analysis. This…

Subjects/Keywords: Fields of Research; Power Conversion; DCDC Converter; HF Transformers; Modulation Strategies; Dual Active Bridge; Zero Voltage Switching; DC Bus Harmonics; Frequency Domain Analysis; Harmonic Analysis

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APA (6th Edition):

Riedel, J. (2017). On frequency domain analysis of dual active bridge dc-dc converters. (Thesis). RMIT University. Retrieved from http://researchbank.rmit.edu.au/view/rmit:162213

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16th Edition):

Riedel, J. “On frequency domain analysis of dual active bridge dc-dc converters.” 2017. Thesis, RMIT University. Accessed January 26, 2020. http://researchbank.rmit.edu.au/view/rmit:162213.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7th Edition):

Riedel, J. “On frequency domain analysis of dual active bridge dc-dc converters.” 2017. Web. 26 Jan 2020.

Vancouver:

Riedel J. On frequency domain analysis of dual active bridge dc-dc converters. [Internet] [Thesis]. RMIT University; 2017. [cited 2020 Jan 26]. Available from: http://researchbank.rmit.edu.au/view/rmit:162213.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

Riedel J. On frequency domain analysis of dual active bridge dc-dc converters. [Thesis]. RMIT University; 2017. Available from: http://researchbank.rmit.edu.au/view/rmit:162213

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

.