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Frequency Stability Control In Low -Inertia Power System Using Virtual Synchronous Generator Novia Utami Putri; Khairudin khairudin; Nining Purwasih
Journal of Engineering and Scientific Research Vol. 3 No. 1 (2021)
Publisher : Faculty of Engineering, Universitas Lampung Jl. Soemantri Brojonegoro No.1 Bandar Lampung, Indonesia 35141

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (1417.338 KB) | DOI: 10.23960/jesr.v3i1.56

Abstract

The stability of the electric power system is divided into transient stability, steady state stability and dynamic stability. Things that affect the performance of the generator include the addition of generators, changes in the load that vary in the system which have an impact on system stability and the distance between the generator and the load. The addition of a Virtual Synchronous Generator (VSG) is needed to improve the power system that is integrated with Renewable Energy Systems Source in maintaining system stability. When the integration between conventional generators and Renewable Energy Systems Source without Virtual Synchronous Generator (VSG) has a frequency response of 58.2 Hz when the generating capacity is -40% of the initial state, while integration between conventional generators and Renewable Energy Systems Source with Virtual Synchronous Generator (VSG) has a steady state response of 60 Hz even though the generating condition is 40% of the initial capacity of the generator. This means that the Virtual Synchronous Generator (VSG) can stabilize the return frequency in its nominal value on the system. Keywords : Inertia, Conventional Generating, Renewable Energy Systems Source, Virtual Synchronous Generator (VSG).  
EFEKTIFITAS MEDIA KOTAKMATIKA DALAM MENINGKATKAN KEMAMPUAN PERKALIAN PADA ANAK BERKESULITAN BELAJAR Nining Purwasih
Jurnal Penelitian Pendidikan Khusus Vol 4, No 1 (2015)
Publisher : Universitas Negeri Padang

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (126.044 KB) | DOI: 10.24036/jupe43480.64

Abstract

The Background of this research is found a child who has difficulties in  learning in 4th class of Elementary school. This child can’t to break the exercise of the arithmetic operations of multiplication and also can’t solve the multiplication of units and tens. In order to increasing ability of arithmetic multiplication operation by using kotakmatika media in mathematics lesson.   This research using Single Subject Research method with A-B-A design. The datas about ability of multiplication of the children is written. Technical analysis of the data used Visual Analysis of Graphs. Results were analyzed include the number of observations in the baseline condition (A-1) 5 times, intervention (B) 8 times, baseline (A-2) 4 times. The results showed that kotakmatika media can enhance child’s ability significantly. It can be seen from the analysis that the trend began to increased. At baseline conditions (A-1) children are only able to answer the multiplication 6 to 10 of 20 about 30% correctly . After being given the treatment by the media of kotakmatika,  child can answer questions about the multiplication correctly abouts 80% of the 20 questions that exist. Besides the intervention is stopped, then returned to kebaseline (A-2) in this condition the child is able to answer questions about the multiplication of 80% of the 20 questions which exist. This shows that the media kotakmatika can improve arithmetic operations of multiplication 6 to 10  in child learning disabilities. Based on data analysis that has been done, it can be concluded that through media kotakmatika can improve learning difficulties in child multiplication at fourth class. Therefore, it is suggested that in arith matic of the  teacher to use kotakmatika media can improve multiplication ability in child ability.
PERANCANGAN SISTEM TRANSFER ENERGI SECARA WIRELESS DENGAN MENGGUNAKAN TEKNIK RESONANSI INDUKTIF MEDAN ELEKTROMAGNETIK Berri M Panggabean; Herman Halomoan; Nining Purwasih
Jurnal Informatika dan Teknik Elektro Terapan (JITET) Vol 2, No 2 (2014)
Publisher : Universitas Lampung

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (644.857 KB) | DOI: 10.23960/jitet.v2i2.234

Abstract

Abstrak  Energi listrik merupakan salah satu kebutuhan pokok yang sangat penting dalam kehidupan manusia saat ini, di mana sampai saat ini pengiriman energi listrik komersial tegangan rendah 220 volt masih mempergunakan kabel listrik. Salah satu cara pengiriman atau transfer energi listrik yang terus dikembangkan sampai saat ini adalah transfer energi listrik  wireless.  Transfer energi listrik  wireless  memiliki  beberapa  kelebihan  dibandingkan menggunakan kabel  yaitu  dapat  meningkatkan kenyamanan dalam penggunaan peralatan listrik  dan  dapat mengurangi jumlah sampah elektronik. Metode yang digunakan untuk  transfer energi wireless pada tugas akhir ini menggunakan  teknik  resonansi induktif medan elektromagnetik.  Pengguna membuat  dua buah  kumparan tembaga berbentuk selenoid yang digunakan untuk menghasilkan induktansi bersama. Rangkaian transfer energi listrik wireless terdiri dari dua yaitu rangkaian pengirim dan rangkaian penerima. Rangkaian pengirim terdiri dari rangkaian LC osilasi dan rangkaian penerima merupakan penggabungan beberapa komponen elektronika.  Realisasi alat bekerja dengan baik dengan pengaturan komponen yang sesuai. Namun pengaruh jarak dan sudut kemiringan antar kumparan sangat mempengaruhi nilai energi listrik yang mampu ditransfer. Semakin jauh jarak antar kumparan,  maka semakin kecil energi yang mampu ditrasfer, demikian juga dengan sudut kemiringan kumparan. Semakin miring sudut kumparan penerima, maka semakin kecil energi listrik yang dihasilkan. Kata kunci :  induktansi bersama,   kumparan tembaga, rangkaian pengirim, rangkaian penerima, transfer energi wireless. Abstract  Electrical energy is one of the basic needs that are essential in human life today,  where until today the delivery of electrical energy commercial low voltage 220 volts still using power cable. One way of delivery or transfer of electric energy are constantly being developed to date  is the transfer of electrical energy wireless. Transfer of electrical energy wireless has several advantages over using a cable that can increase comfort in the use of electrical equipment and can reduce the amount of electronic waste. The method used for  wireless energy transfer in this paper uses an resonance techniques inductive electromagnetic field. User create two shaped copper solenoid coils used to generate the mutual inductance. Wireless electrical energy transfer circuit consists of two circuits that the transmitter and receiver circuit. Transmitter circuit consists of a series LC oscillation andreceiver circuit is a merger several electronic components. Realization tool works well with setting the appropriate components. However, the effect of distance and tilt angle between the coil greatly affect the value of the electricity that is able to be transferred. The farther away the distance between the coils, the smaller energy capable to be transfer. as well as the slope angle the coil. The more sloping angle of the receiver coil, the smaller the electric energy is generated.  Key word : mutual inductance, copper coils, transmitter circuit, receiver circuit, wireless energy transfer 
Sifat listrik dan mekanis komposit serat kelapa sebagai material proteksi petir Diah Permata; Herman H. Sinaga; Nining Purwasih; Reksa Pati
Prosiding Seminar Nasional Ilmu Teknik Dan Aplikasi Industri Fakultas Teknik Universitas Lampung Vol. 5 (2022): SINTA
Publisher : Fakultas Teknik Universitas Lampung

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (195.746 KB) | DOI: 10.23960/prosidingsinta.v5i.75

Abstract

Komposit serat kelapa sudah banyak digunakan sebagai bagian interior pada produk otomotif. Jika komposit serat kelapa digunakan sebagai eksterior maka harus dikaji kemampuan material tersebut dalam menyalurkan arus jika terkena kendaraan tersebut terkena sambaran petir. Komposit serat kelapa yang dibuat dalam penelitian ini dengan variasi komposisi: 5 wt%, 10 wt%, dan 15 wt%. Sifat listrik yang diukur adalah resistivitas-volume sedangkan sifat mekanis yang diukur adalah kuat tarik. Pengukuran resistivitas-volume menggunakan metode 4 titik probe dan pengukuran kuat tarik mengggunakan metode ASTM D638-1. Hasil pengukuran resistivitas-volume digunakan untuk menghitung konduktivitas-volume. Konduktivitas-volume yang paling tinggi yaitu 0,0135 S/m dihasilkan oleh komposit serat kelapa 15 wt%. Sedangkan kuat tarik yang paling tinggi yaitu 21,96 MPa juga dihasilkan oleh komposit serat kelapa 15 wt%. Namun konduktivitas komposit serat kelapa yang dihasilkan masih cukup rendah sehingga tidak cukup baik untuk digunakan sebagai material penyalur arus petir.