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All Journal ELKOMIKA: Jurnal Teknik Energi Elektrik, Teknik Telekomunikasi, & Teknik Elektronika Jurnal Pengabdian Magister Pendidikan IPA Journal Serambi Engineering (JSE)
Muhammad Rivaldi Harjian
UNIVERSITAS MATARAM
Earth & Planetary Sciences Education Electrical & Electronics Engineering Energy Engineering Environmental Science Industrial & Manufacturing Engineering

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Pelatihan Pemanfaatan Limbah Pertanian Untuk Meningkatkan Kesadaran Masyarakat Dalam Pengolahan Limbah Pertanian Menjadi Biomassa Di Desa Batu Mekar Kecamatan Lingsar Muhammad Rivaldi Harjian; Ida Ayu Sri Adnyani; Supriyatna; abdul Natsir; I Ketut Perdana; Akbar Tawaqqal
Jurnal Pengabdian Magister Pendidikan IPA Vol 9 No 2 (2026): April-Juni 2026
Publisher : Universitas Mataram

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.29303/jpmpi.v9i2.15210

Abstract

Agricultural waste such as rice straw and wood waste has great potential to be utilized as an environmentally friendly biomass energy source. However, the community in Batu Rimba Hamlet, Batu Mekar Village, Lingsar District, still tends to openly burn this waste, causing environmental pollution and not providing optimal economic value. This community service activity aims to increase community understanding, awareness, and interest in processing agricultural waste into biomass fuel. The implementation method is carried out through the stages of problem identification, socialization, training, direct practice of biomass production, and activity evaluation using a questionnaire for 20 training participants. The materials provided include biomass potential, the impact of open burning, and techniques for processing wood waste and straw into alternative fuels such as biomass briquettes. The results of the activity showed that the training program successfully increased community capacity with an average level of understanding of 83.25%, awareness of 84.50%, and interest and readiness of 84.75%. Overall, the average evaluation score reached 84.17%, which is included in the high category. In addition to improving community knowledge and skills, this activity also fosters awareness of the importance of sustainable agricultural waste management and has the potential to open up renewable energy-based business opportunities at the local level. Therefore, training on utilizing wood and straw waste as biomass can be an educational and practical solution to support more valuable and environmentally friendly agricultural waste management. Keywords: agricultural waste, biomass, briquettes, community training, renewable energy.
Hybrid Particle Swarm Optimization–Simulated Annealing OPF for Lombok Generation Cost Reduction MUHAMMAD RIVALDI HARJIAN; AGUNG BUDI MULJONO; AKBAR TAWAQQAL; RAJA RESKI EKA PUTRA
ELKOMIKA: Jurnal Teknik Energi Elektrik, Teknik Telekomunikasi, & Teknik Elektronika Vol 13, No 4: Published November 2025
Publisher : Institut Teknologi Nasional, Bandung

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.26760/elkomika.v13i4.409

Abstract

This study proposes the application of Optimal Power Flow (OPF) in the Lombok Electricity System consisting of 19 buses and 7 generating units, with the main objective of reducing production costs under peak load conditions. The method used is a hybrid optimization method that combines two methods, namely the Particle Swarm Optimization and Simulated Annealing algorithms. Particle Swarm Optimization and Simulated Annealing (PSO–SA) method. Combining PSO and SA algorithms can improve the weaknesses of PSO with its jumping feature. In other words, the use of the PSO-SA algorithm is more effective than the PSO method. The simulation results show a generation cost of USD 31,158. The total generated power is 193,736 MW, which is equivalent to a total load of 193.34 MW. In addition, the voltage profile of all buses is at 0.95–1.05 pu and the power flow of all lines is below the thermal capacity. This finding confirms that the use of the PSO–SA algorithm effectively reduces operating costs without violating the system's operating constraints.
Desain Dan Analisis Pengisian Baterai Sepeda Listrik Mandiri Pada PLTS Off-Grid Fakultas Teknik Universitas Mataram Supriyatna; Ni Made Seniari; Ida Ayu Sri Adnyani; Sabar Nababan; Abdul Natsir; Muhammad Rivaldi Harjian; Agung Herdiansyah
Jurnal Serambi Engineering Vol. 11 No. 3 (2026): Juli 2026
Publisher : Faculty of Engineering, Universitas Serambi Mekkah

Show Abstract | Download Original | Original Source | Check in Google Scholar

Abstract

Peningkatan penggunaan kendaraan listrik mendorong kebutuhan sistem pengisian energi yang ramah lingkungan dan mandiri. Pemanfaatan Pembangkit Listrik Tenaga Surya (PLTS) off-grid menjadi salah satu solusi untuk mendukung sistem pengisian baterai kendaraan listrik tanpa ketergantungan pada jaringan listrik konvensional. Penelitian ini bertujuan merancang dan menganalisis sistem pengisian baterai sepeda listrik mandiri menggunakan PLTS off-grid berkapasitas 1200 Wp di Fakultas Teknik Universitas Mataram. Sistem yang dirancang terdiri atas panel surya, Solar Charge Controller (SCC), baterai, inverter, dan box charger yang dilengkapi sistem kendali pengisian. Pengujian dilakukan pada baterai sepeda listrik 48 V–12 Ah menggunakan dua skenario pengisian, yaitu arus tetap dan arus tidak tetap. Hasil pengujian menunjukkan bahwa metode pengisian arus tidak tetap menghasilkan waktu pengisian lebih cepat, yaitu 6,5 jam dengan kebutuhan energi total sebesar 681,02 Wh, sedangkan metode arus tetap menghasilkan pengisian yang lebih stabil dan berpotensi meningkatkan umur baterai. Analisis efisiensi box charger menunjukkan nilai efisiensi pengisian berada pada rentang 80–98% dengan rata-rata sebesar 90,28%. Hasil penelitian menunjukkan bahwa sistem pengisian berbasis PLTS off-grid mampu bekerja secara efektif dan memiliki efisiensi yang tinggi untuk mendukung stasiun pengisian kendaraan listrik skala kampus.
Co-Authors Abdul Natsir Agung Budi Muljono Agung Herdiansyah Akbar Tawaqqal I Ketut Perdana Ida Ayu Sri Adnyani Nababan, Sabar Ni Made Seniari RAJA RESKI EKA PUTRA Supriyatna