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Failure detection of switching device in a cascaded h-bridge modular multilevel converter

Failure detection of switching device in a cascaded h-bridge modular multilevel converter / Nurnazmi Syuhada Nazeri
Peranti pensuisan seperti MOSFET, IGBT dan BJT digunakan secara meluas dalam kuasa aplikasi elektronik. Walau bagaimanapun, kegagalan peranti pensuisan boleh berlaku disebabkan oleh kecacatan pembuatan atau ralat yang berkaitan pendawaian. Sebagai akibatnya, masalah utama seperti litar pintas dan peralatan rosak akan berlaku. Oleh itu, adalah penting untuk mewujudkan satu sistem yang boleh mengesan kegagalan peranti pensuisan untuk mencegah kerosakan selanjutnya. Pembangunan sistem pengesanan kegagalan untuk peranti pensuisan terdiri daripada dua komponen penting iaitu H-bridge model dan MATLAB fungsi pengekodan. Kedua-dua komponen yang dibina dengan menggunakan perisian MATLAB R2017b bagi kerja-kerja simulasi. Reka H-bridge terdiri daripada empat MOSFET kuasa. Fungsi H-Bridge adalah untuk mensimulasikan kegagalan peranti pensuisan. Di samping itu, MATLAB fungsi pengekodan dibina untuk mengesan kegagalan peranti pensuisan. Di samping itu, MATLAB fungsi pengekodan dibina untuk mengesan kegagalan peranti pensuisan. Dari simulasi H-bridge, nilai-nilai arus, suhu, dan dv/dt diekstrak. Nilai diekstrak ditugaskan sebagai masukan untuk fungsi MATLAB pengekodan untuk mengesan kegagalan peranti pensuisan. Penarafan mutlak maksimum arus, suhu dan dV / dt masing-masing 50A, 150℃, dan 50V/ns. Dalam projek ini, dua masukan DC voltan yang berbeza, 24V dan 600V dibekalkan kepada H-bridge untuk menguji kerja sistem pengesanan kegagalan. Apabila 24V dibekalkan kepada H-Bridge Inverter pengesanan kegagalan menunjukkan bahawa tiada kegagalan berlaku kepada peranti pensuisan. Sementara itu, apabila 600V dibekalkan kepada H-bridge pengesanan kegagalan dapat mengesan kegagalan yang berlaku kepada peranti pensuisan kerana nilai keluaran arus, suhu dan dV/dt dari simulasi H-bridge adalah lebih tinggi daripada nilai maksimum mutlaknya. Hasilnya menunjukkan bahawa kegagalan dalam peranti pensuisan boleh dikesan dengan menggunakan sistem pengesanan kegagalan yang telah dicipta. _______________________________________________________________________________________________________ Switching devices such as MOSFET, IGBT and BJT are widely used in power electronic applications. However, the failures of the switching devices can occur due to the manufacturing defects or the errors in the wiring connection. As the consequences, major problems such as short circuited and damaged equipment will occur. Therefore, it is important to create a system that can detect the failure of the switching devices to prevent further damages. The development of the failure detection system for the switching devices consists of two important components which are H-bridge Inverter model and the MATLAB Function coding. Both components are built by using MATLAB R2017b software for the simulation works. The H-bridge design is made up of four power MOSFETs. The function of H-bridge is to simulate the failure of the switching devices. In addition, MATLAB Function coding is built to detect the failure of the switching devices. From the H-Bridge Inverter simulation, the values of current, temperature, and dv/dt are extracted. The extracted values are assigned as the input for the MATLAB Function coding to detect the failure of the switching devices. The maximum absolute rating of current, temperature and dV/dt are 50A, 150℃, and 50V/ns respectively. In this project, two different input DC voltage, 24V, and 600V are supplied to the H-Bridge Inverter to test the working of the failure detection system. When 24V is supplied to the HBridge Inverter the failure detection shows that no failure occurred to the switching devices. Meanwhile, when the 600V is supplied to the H-Bridge Inverter the failure detection able to detect the failure that occurs to the switching devices due to the output rating of the current, temperature and dV/dt from the H-Bridge simulation are higher than its absolute maximum rating of the Power MOSFET. The result shows that the failures in the switching devices can be detected by using the failure detection system that has been created.
Contributor(s):
Nurnazmi Syuhada Nazeri - Author
Primary Item Type:
Final Year Project
Identifiers:
Accession Number : 875008735
Language:
English
Subject Keywords:
Switching; MOSFET; electronic
First presented to the public:
6/1/2019
Original Publication Date:
3/11/2020
Previously Published By:
Universiti Sains Malaysia
Place Of Publication:
School of Electrical & Electronic Engineering
Citation:
Extents:
Number of Pages - 88
License Grantor / Date Granted:
  / ( View License )
Date Deposited
2020-03-11 12:21:42.718
Date Last Updated
2020-12-02 15:34:19.068
Submitter:
Mohd Jasnizam Mohd Salleh

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