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"The advantages optical fiber in communication field are widely utilized in developing steps from electrical communication to optical communication. Optical fiber communication promise extremely high data rate over long distance transmission without needing to amplify and retransmit along the way. It is well understood that if frequency of the transmitted signals. is increased some problems such as electromagnetic interferences. crosstalk and signal distortions will appear. Those difficulties can. be solved or eliminated by using optical fiber cable. instead of copper cable.Optical fiber used to transmit and to receive information signal mutinously was usually separated in difference fibers for transmitting and receiving direction. I n this thesis a bi-directional transmission system through a single fiber with same wavelength by the use of rod lenses was constructed. A simple circuit design techniques have been used in order to make transmitter and receiver. To combine and to separate transmitter and receiver in each side to and from the fiber, two quarter-pitch GRIN rod lenses functioning as optical directional coupler was used.The result of the experiment as a model of bi-directional optical communication system shows a good performance with an appropriate reliability. The measurement results of power distribution loss. crosstalk and signal transmission quality that have been evaluated to conclude the entire result."

"Sumber-sumber energi terbarukan yang menghasilkan energi listrik disatukan dalam sistem DC Mikrogrid. Sebenarnya energi listrik yang dihasilkan masih bersifat fluktuatif sehingga belum sepenuhnya bisa diandalkan agar sistem DC Mikrogrid dapat berjalan secara kontinu. Untuk menjamin kehandalannya, maka DC Mikrogrid akan dihubungkan ke jaringan utilitas (PLN) sehingga ketika DC Mikrogrid kekurangan daya listrik dapat menerima dari PLN sebaliknya jika DC Mikrogrid memiliki daya listrik yang lebih, DC Mikrogrid dapat mensuplai ke PLN, dengan demikian dapat terjadi transfer daya listrik antara kedua sistem tersebut. Untuk itu diperlukan alat yang dapat menghubungkan kedua sistem tersebut yaitu bi-directional inverter. Bi-directional inverter adalah konverter yang dapat mengubah tegangan DC menjadi tegangan AC ataupun sebaliknya.Dalam skripsi ini akan dibuat konfigurasi yang terdiri dari alat-alat rectifier, boost konverter, buck konverter dan grid tie inverter menjadi sebuah bi-directional inverter. Untuk pengujian kapasitas dan efisiensi alat ini, digunakan beban lampu dengan daya masing masing sekitar 7W. Pengukuran daya diambil pada keluaran dari boost konverter dan grid tie inverter.

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Renewable energy sources that generate electricity are incorporated in the DC system Microgrid. Actual electrical energy generated is still fluctuating so that is not fully reliable for the system DC Microgrid can run continuously. To ensure reliability, the DC Microgrid will be connected to a network utility (PLN) so that when the DC power shortage Microgrid can receive from PLN vice versa if the DC Microgrid have more power, DC Microgrid can supply to PLN, thus the power transfer can occur between the two systems. It required a tool that can connect the two systems is bi-directional inverter.

Bi-directional inverter is a converter that can convert DC voltage into AC voltage or otherwise. In this thesis will be the configuration consisting of tools rectifier, boost converter, buck converter and grid tie inverter into a bi-directional inverter. To test the capacity and efficiency of this tool, used to power the lamp load each about 7W. Power measurement is taken at the output of the boost converter and grid tie inverter."

"Mobil atau kendaraan listrik (EVs) telah mendapatkan banyak perhatian di seluruh dunia sebagai solusi permasalahan pengurangan emisi gas buang. Dalam sistem mobil listrik tersebut baterai menjadi komponen vital sebagai sumber tenaga listrik penggerak yang efisien. Menjadi satu hal yang sangat penting diperhatikan adalah pengisian bateri secara on-board atau off-board yang efisien. Karena keterbatasan infrastruktur pengisian bateri cepat yang khusus, sebagian besar kendaraan listrik dilengkapi dengan On-Board Battery Charger (OBC) yang memungkinkan mereka mengisi daya dari soket utilitas yang ada di mana-mana. Untuk itu, menjadi penting untuk mengangkat tema penelitian tentang OBC. Studi ini menyajikan konverter non-isolasi dua tahap satu fase untuk pengisi daya baterai kendaraan listrik hybrid plug-in terpasang. Pada penelitian ini, kinerja konverter akan ditingkatkan dengan menerapkan Fractional-Order PID (FOPID) pada bagian kontrolernya. Evaluasi kinerja rancangan OBC dilaukan melalui simulasi untuk menunjukkan keefektifan sistem yang diusulkan. Rangkaian yang dihasil dapat menghasilkan pemakaian induktor sekitar 5 kali lebih kecil pada bagian Power Factor Correction (PFC) rangkaian, dapat lebih meminimalisisr rugi-rugi konduksi yang terjadi pada bagian DC-DC Converter, dan membuat sistem 0.03s lebih cepat sampai pada titik stabilnya. Diharapkan dengan peningkatan-peningkatan yang dilakukan diberbagai bagian rangkaian OBC pada studi ini, bisa menghasilkan rangkaian OBC yang dapat menjawab tantangan-tantangan yang ada saat ini dalam pengaplikasiannya, dan dapat diaplikasiakan dengan mudah di masa depan

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Electric cars or vehicles (EVs) have received a lot of attention worldwide as a solution to the problem of reducing exhaust emissions. In the electric car system, the battery becomes a vital component as an efficient source of electric power. One thing that is very important to note is efficient on-board or off-board battery charging. Due to the limitations of a dedicated fast charging infrastructure, most electric vehicles are equipped with an On-Board Battery Charger (OBC) that allows them to charge from the ubiquitous utility socket. For this reason, it is important to raise the theme of research on OBC. This study presents a single-phase two-phase non-insulated converter for a plug-in hybrid electric vehicle battery charger installed. In this research, the converter performance will be improved by applying Fractional-Order PID (FOPID) on the controller part. Evaluation of the performance of the OBC design is carried out through simulations to demonstrate the effectiveness of the proposed system. The resulting circuit can produce the use of an inductor about 5 times smaller in the Power Factor Correction (PFC) section of the circuit, can further minimize conduction losses that occur in the DC-DC Converter section, and make the system 0.03s faster to reach its stable point. It is hoped that with the improvements made in various parts of the OBC series in this study, it can produce an OBC series that can answer the challenges that exist today in its application, and can be applied easily in the futur"