Evaluasi Kinerja IMAG pada Pembangkit Listrik Tenaga Mikrohidro Cokro Tulung Kabupaten Klaten

Mahalla Mahalla, Suharyanto Suharyanto, M. Isnaeni B. S.

Abstract


Abstract—IMAG (Induction Motor as Asynchronous Generator) or induction motor that is used as an asynchronous generator having been widely used in micro-hydro Power Plant (MHP)usually in small capacity, i.e below 100 Kw. The reason for the widespread popularity of induction generator is owing to it’s capability to generate the power from variable speed as well as constant speed prime movers, low unit cost, reduced maintenance, rugged and brushless rotors, absence of a separate d.c. source for excitation, absence of moving contacts, inherent overload protection, improved performance due to low transient impedance, natural protection against short circuit, there are many on the market etc. Their main disadvantage is poor voltage and frequency regulation under varying load and speed. Imag performance evaluation needs to be analyzed including it is voltage stability analysis and frequency analysis in expenses. Based on the analysis of the system in general, efficiency is 47,38% total imag and positions the turbine room and Imag are still far from flood-free area, so a high fall (head) can be increased from 1 m up to 2.21 m, this can increase the potential and generated power of 82.56% Based on the analysis of the daily load, major load changes affect changes in voltage and frequency output of the imag, this was due to the load current controller can not work fast (slow response) to divert the major load changes to the load apparent (ballast load). There are several methods that can be done to control the voltage and frequency, one method of which is to adjust the load (dummy load). The results of the analysis will be in the form of recommendations for improvement so that the MHP and the frequency of the voltage instability can be obtained to ensure the quality of the electricity generated by Imag at MHP system.

Intisari—IMAG atau motor induksi yang digunakan sebagai generator asinkron telah banyak digunakan pada Pembangkit Listrik Tenaga Mikrohidro (PLTMh) yang kapasitasnya kecil,yaitu dibawah 100 Kw. Alasan popularnya penggunaan IMAG adalah karena kemampuan untuk menghasilkan listrik dari variabel kecepatan serta kecepatan konstan penggerak mula, biaya yang murah, perawatan yang mudah, tidak memerlukan sumber dc untuk eksitasi, perbaikan kinerja karena impedansi transient yang rendah, perlindungan alami terhadap hubung singkat, banyak terdapat dipasaran dll. Kekurangan utamanya adalah pengaturan tegangan dan frekuensi pada saat terjadi perubahan beban dan kecepatan penggerak mula. Evaluasi kinerja dari IMAG pada sistem PLTMh perlu dilakukan, yaitu analisis stabilitas tegangan dan frekuensi dan analisis beban harian. Berdasarkan analisis sistem secara umum, effisiensi total IMAG adalah 47,38 % dan posisi ruang turbin dan IMAG masih jauh dari area banjir, sehingga tinggi jatuh (head) dapat ditingkatkan 1 meter menjadi 2,21 meter, hal ini dapat meningkatkan daya potensial dan daya terbangkit sebesar 82,56 % Berdasarkan analisa beban harian, perubahan beban utama mempengaruhi perubahan tegangan dan frekuensi output dari IMAG, hal ini disebabkan karena pengontrol beban yang ada sekarang tidak bisa bekerja dengan baik untuk mengalihkan perubahan beban utama ke beban semu (ballast load). Ada beberapa metode yang bisa dilakukan untuk mengontrol tegangan dan frekuensi, salah satu metode adalah dengan mengatur beban (dummy load). Hasil analisa akan dijadikan rekomendasi untuk perbaikan PLTMh sehingga ketidakstabilan tegangan dan frekuensi bisa diatasi untuk menjamin mutu listrik yang dihasilkan oleh IMAG pada sistem PLTMh.

Kata kunci—PLTMh, generator asinkron, kestabilan, tegangan, frekuensi


Full Text:

PDF

References


Bhim Singh and V. Rajagopal, Electronic Load Controller For Islanded Asynchronous Generator In Picohydro power Generation, Indian Institute of Technology Delhi.

Bucur Lu.trea dan Ioan Borlea, Aspects of asynchronous generators parallel operation, "Politehnica" University of Timi.oara, Romania

Fauzan, 2012, "Studi perbaikan Faktor Daya Beban Induktif dengan Kompensator Reaktif seri menggunakan saklar pemulih energi magnetik".Tesis Jurusan Teknik Elektro dan Teknologi Informasi UGM.

Fathy M.M.Bassiouny, Performance Analysis of Self Excited Induction Genarators, Department of Electronic Technology College of Technology at Dammam, K.S.A.

J. P. Ngoma Cand. Sc.(Eng),dkk ,2008, Compensation of reakctive power of asynchronous generotor at small hydro power, Energetics and electrical engineering,

Наукові праці ВНТУ, 2008, No 2.

Karim H. Youssef, dkk,(2008) A New Method for Voltage and Frequency Control of Stand-Alone Self-Excited Induction Generator Using PWM Converter with Variable DC link Voltage, American Control Conferenc

Khairul Amri, (2009), Kajian Potensi Pembangkit Listrik Tenaga Mikrohidro Di Sungai Air Kule Kabupaten Kaur, Program Studi Teknik Sipil Universitas Bengkulu

Nguyen Tung Linh dan Trinh Trong Chuong, Voltage stability analysis of grids connected wind generators, Electric Power University dan Ha Noi University of Industry

R. C. Bansal, 2005, Three-Phase Self-Excited Induction Generators: An Overview, IEEE Transactions On Energy Conversion, VOL. 20, NO. 2.

Rolf Widmer dan alex Arter,1992, Village Electrification, SKAT,Swiss Centre for Development Cooperation in Technology and Management.

Shailendra Sharma and Bhim Singh, 2010. Performance Evaluation of Asynchronous Generator Based Islanded Wind Energy Conversion System , 16th National Power System Conference, 15th-17th December, 2010 .

Subramanian Kulandhaivelu dan K.K.RAY, 2011. Load Control of A 3-O Self-Excited Asynchronous Generator, International Journal of Engineering Science and Technology (IJEST), ISSN : 0975-5462 Vol. 3 No. 2 Feb 2011.

Vlastimil .antin, 2010, Mathematical Modelling Of Doubly-Fed Asynchronous Generator, Intensive Programme gRenewable Energy Sources. , May 2010, .elezna Ruda-.pi.ak, University of West Bohemia, Czech Republic.

Wasimudin Surya S, Analisa Karakteristik Motor Induksi Sebagai Generator (MISG) Pada pembangkit listrik Tenaga Mikrohidro (PLTMh), Jurusan Pendidikan Teknik Elektro UPI . Bandung..




DOI: http://dx.doi.org/10.22146/jnteti.v2i1.32

Refbacks

  • There are currently no refbacks.


Copyright (c) 2016 Jurnal Nasional Teknik Elektro dan Teknologi Informasi (JNTETI)

JNTETI (Jurnal Nasional Teknik Elektro dan Teknologi Informasi)

Departemen Teknik Elektro dan Teknologi Informasi, Fakultas Teknik Universitas Gadjah Mada
Jl. Grafika No 2. Kampus UGM Yogyakarta 55281
+62 274 552305
jnteti@ugm.ac.id