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All Journal Bulletin of Electrical Engineering and Informatics Indonesian Journal of Electrical Engineering and Computer Science Prosiding Seminar Nasional Teknik UISU (SEMNASTEK)
Syafruddin Hasan
Universitas Sumatera Utara
Electrical & Electronics Engineering Engineering

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Design and simulation hybrid filter for 17 level multilevel inverter Marshal Andrea Hutabarat; Syafruddin Hasan; Ali Hanafiah Rambe; Suherman Suherman
Bulletin of Electrical Engineering and Informatics Vol 9, No 3: June 2020
Publisher : Institute of Advanced Engineering and Science

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (643.711 KB) | DOI: 10.11591/eei.v9i3.890

Abstract

The increasing of renewable energy applications such as solar cells, wind power, ocean thermal and HVDC (high voltage direct current) cause increment in the use of the inverter circuit. Harmonics that are generated by the inverter have negative impacts on the electrical equipment; harmonics cause excessive heat and may shorten the life of electrical equipment. A multilevel inverter is an arranged of cascaded inverters which aims to reduce total  harmonic distortion (THD). This paper proposes the design of 17 levels of a single-phase cascaded multilevel inverter with a hybrid filter insertion. By using PSIM simulator, the hybrid filter is proven reducing THD better than single pulse width modulation (SPWM) inverter. Installation of the hybrid filter is able to fix a maximum of 0.23% THDv and a maximum of 1.05% THDi. Hybrid filter installation reduces the value of THD to comply with IEEE 519-2014 standard.
Embedding the three pass protocol messages into transmission control protocol header Suherman Suherman; Deddy Dikmawanto; Syafruddin Hasan; Marwan Al-Akaidi
Indonesian Journal of Electrical Engineering and Computer Science Vol 22, No 1: April 2021
Publisher : Institute of Advanced Engineering and Science

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.11591/ijeecs.v22.i1.pp442-449

Abstract

Transmission control protocol provides reliable communication between two or more parties. Each transmitted packet is acknowledged to make sure successful deliveries. Transport layer security protocols send security information exchange as TCP loads. As results, the handshaking stage experiences longer delay as TCP acknowledgement process has already been delay prone. Furthermore, the security message transfers may have their own risks as they are not well protected yet. This paper proposes TCP-embedded three pass protocol for dynamic key exchange. The key exchange is embedded into TCP headers so that transmission delay is reduced, and message transfer is secured. The proposed protocol was assessed on self network by using socket programming in lossless environment. The assessments showed that the proposed protocol reduced three-pass protocol message transfer delay up to 25.8% on lossless channel. The assessment on security also showed that TCP-embedded three pass protocol successfully secured each transmitted TCP load using a unique key; that is much securer than the compared method.
PENGARUH HARMONISA PADA TRANSFRMATOR DAYA Syafruddin Hasan; Ali Hanfiah Rambe; Ferry R.A. Bukit; Alfian Alfian; Meutia Nurfahasdi
Prosiding Seminar Nasional Teknik UISU (SEMNASTEK) SEMNASTEK UISU 2023
Publisher : Fakultas Teknik Universitas Islam Sumatera Utara

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (1023.004 KB)

Abstract

Transformator daya adalah bagian integral dari hampir semua jaringan penyaluran daya listrik mulai dari pembangkitan sampai ke pengguna energi listrik (jaringan transmisi dan distribusi). Pelayanan yang baik merupakan hal yang sangat penting dalam suplai daya listrik. Ada sejumlah faktor yang menggganggu operasi sebuah transformator, diantaranya adalah keberadaan harmonisa listrik dalam sistem tenaga listrik. Perkembangan penggunaan beban-beban listrik non linear yang sejalan dengan perkembangan pengunaan komponen dan peralatan berbasiskan pada konverter daya. Tulisan ini memberikan kajian pengaruh harmonisa terhadap unjuk kerja dari sebuah transformator dengan adanya harmonisa yang dikhususkan atas adanya DC bias.Analisis dilakukan lewat Simulasi menggunakan software MATLAB dan verifikasi dilakukan lewat data eksperimental. Hasil menujukkan keluaran simulasi bersesuain dengan data pengujian langsung. DC bias mengakibatkan pola harmonisa orde genap juga menjadi lebih signifikan.
Co-Authors Alfian Alfian Ali Hanafiah Rambe Ali Hanfiah Rambe Deddy Dikmawanto Ferry R.A. Bukit Marshal Andrea Hutabarat Marwan Al-Akaidi Meutia Nurfahasdi Suherman Suherman