Abstract
The concept of multiport dc-dc converter was proposed to reduce the conversion stages of dc microgrid on more electric aircraft (MEA). The structure of multiport dc-dc converter is basically developed from the dual active bridge (DAB) converter because of its galvanic isolation and bidirectional power flow. A power electronics converter as a key element of the electrical power distribution system may cause stability issues. To address these challenges, the impedance characteristic of the multiport converter will be analyzed. In this paper, a transfer function based small signal model is developed and validated with a switching model, to figure out the characteristic of input impedance of triple active bridge (TAB) converter. Preliminary experimental results are presented to be as a support.
Highlights
Nowadays, the electrification of transportation becomes an irresistible trend to cope with the lack of conventional energies and environmental deterioration
In the aspect of aerospace, the concept of all electric aircraft (AEA) which emphasizes using onboard electrical devices to power main engine and propulsion engine at startup, was considered by military aircraft engineers since World War II [1]
The most popular topology is dual active bridge (DAB) converter which is composed of two H-bridges and a high frequency (HF) transformer
Summary
The electrification of transportation becomes an irresistible trend to cope with the lack of conventional energies and environmental deterioration. A conventional dc microgrid consists of multiple dc-dc converters to achieve different dc voltage levels for individual use This pattern allows the power to be transferred simultaneously, it has many conversion stages and communication devices between converters, resulting in complex structure and high cost. The most popular topology is dual active bridge (DAB) converter which is composed of two H-bridges and a high frequency (HF) transformer With such a structure, bidirectional power flow can be achieved by means of control. An alternative technique is proposed, which uses the small signal equations derived from power equation, to acquire the small signal model of input impedance of TAB converter. By simplifying the block scheme, the input admittance of TAB converter can be derived as (3.6)
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