Analysis and small‐signal modelling technique for support bus DC‐link of front‐end coupling inductance high step‐up single switch boost converter in low voltage renewable source

Autor: Anusak Bilsalam, Nattakorn Ketprapajun, Puntarika Insri, Hatta Sawachan, Damien Guilbert, Phatiphat Thounthong
Jazyk: angličtina
Rok vydání: 2024
Předmět:
Zdroj: IET Power Electronics, Vol 17, Iss 2, Pp 295-311 (2024)
Druh dokumentu: article
ISSN: 1755-4543
1755-4535
DOI: 10.1049/pel2.12638
Popis: Abstract This study proposes a non‐isolated DC converter, which is connected in series with an inverter, with a high output voltage conversion ratio for application in electricity generation systems to upgrade low‐voltage to high‐voltage DC. The topology of the proposed converter is based on a boost converter, which has the limitation of a low voltage conversion ratio. The converter is developed and connected using a coupling inductance technique by adding a second winding L2 coupled with the prototype winding and diode D2. This technique increases the voltage ratio via the ratio operator (N) of both the induction coils by operating a single switch at a constant frequency of 60 kHz. The working principle of the proposed converter is based on pulse width modulation with a duty cycle ≤40%. When the converter receives a low voltage DC input of 36 V, it converts the input to a high output voltage of 325 V at an output power 125 W, showing a circuit efficiency of 92.48% at full load. The synthesis and design of the controller include a linear approach to represent the parameters using the small signal methodology, which is employed to establish a transfer function. Furthermore, the proposed converter is capable of effectively regulating the output voltage, even when subjected to variations in the output load by employing a proportional–integral control mechanism. The close loop results obtained from simulations and practical implementation verified the proposed circuit design, as both results agreed with the theoretical analysis.
Databáze: Directory of Open Access Journals
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