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All Journal Bulletin of Electrical Engineering and Informatics Jurnal Teknik Elektro JTEIN: Jurnal Teknik Elektro Indonesia Jurnal Desiminasi Teknologi Jurnal Surya Energy Energy: Jurnal Ilmiah Ilmu-ilmu Teknik
Alisha Gita Gumilang
Universitas Tridinanti
Automotive Engineering Chemical Engineering, Chemistry & Bioengineering Civil Engineering, Building, Construction & Architecture Computer Science & IT Control & Systems Engineering Earth & Planetary Sciences Education Electrical & Electronics Engineering Energy Engineering Industrial & Manufacturing Engineering Materials Science & Nanotechnology Mechanical Engineering

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Interference Management Based on Clustering Method for Ultra-Dense Networks in Multicellular Network Gumilang, Alisha Gita; Susanto, Misfa; Fitriawan, Helmy
Jurnal Teknik Elektro Vol 15, No 2 (2023): Jurnal Teknik Elektro
Publisher : Jurusan Teknik Elektro, Fakultas Teknik, Universitas Negeri Semarang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.15294/jte.v15i2.48738

Abstract

One of solutions to address the increasing demands for data traffic by mobile users is to implement ultra dense network (UDN). UDN consists of many femtocells that are densely deployed on macrocellular communication networks. Since femtocells radius is very short and they are tightly packed, it faces interferences problem i.e., co-tier and cross-tier interferences. This paper proposes interference management technique based on clustering method for UDN multicellular communication networks at downlink transmission. It is purposed to reduce interference effects. To evaluate the proposed clustering method, two simulation scenarios have been designed; namely baseline system and system with the proposed clustering method. The scenarios applied is to randomly distribute femtocells following a uniform distribution in three macrocells areas. Through a clustering algorithm, adjacent femtocells are grouped into one cluster and assigned different frequency channels for each femtocell in that cluster. The same cluster pattern is repeated for all femtocells. Thus, interference effect is canceled within one cluster and reduced among clusters by widening the distance among femtocells that use the same frequency channels. Through simulation experiment, the proposed clustering method is evaluated and compared to the baseline system. The simulation results show that Signal to Interference plus Noise Ratio (SINR) of femtocells increases 0.44 dB, throughput increases 1.67%, Bit Error Rate (BER) reduces, and other parameters improve as well which include spectral efficiency, network energy, and average network energy. The proposed clustering method increases performances of the networks and provides better solution for transmission data speed in densely femtocell network.
Interference management based on clustering in RIS-aided ultra dense network under multicell scenario Susanto, Misfa; Gumilang, Alisha Gita; Fitriawan, Helmy; Aziz, Azrina Abd
Bulletin of Electrical Engineering and Informatics Vol 14, No 4: August 2025
Publisher : Institute of Advanced Engineering and Science

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.11591/eei.v14i4.9495

Abstract

Ultra dense network (UDN) and reconfigurable intelligent surface (RIS) are two latest technologies in encountering the increasing demands for network capacity and quality of service in wireless cellular networks. UDN is created by densely deploying femtocells in macrocells area. It causes complex interferences because distances among femtocells are likely very close. RIS provides solution in regulating the reflection of the signal emitted from the transmitter to the receiver to resolve the obstacles. However, RIS reflects the interference signals as well causing more complex interference problems. This paper proposes a solution using clustering method as interference management in RIS-aided UDN network. By clustering method, nearby femtocells are grouped and allocated different frequency channels among femtocells in a cluster. The performance of two systems–the baseline system and the one employing a clustering method–is evaluated based on signal to interference plus noise ratio (SINR), throughput, and bit error rate (BER). Simulation results indicate that SINR and throughput improved by 1.57% and 1.73%, respectively. Meanwhile, the BER for the baseline system is 5.78×10-8 and decreased when applying the proposed method system with a value of 2.26×10-8. The proposed clustering method is promising to confront the interference problems.
ANALISIS ALIRAN DAYA DAN HUBUNG SINGKAT PADA JARINGAN TRANSMISI 70KV DI PT.PLN (PERSERO) WS2JB PALEMBANG Thriska Dewi Umi Rasyda; Alisha Gita Gumilang
Jurnal Desiminasi Teknologi Volume 14 Nomor 1 Januari 2026
Publisher : Fakultas Teknik Universitas Tridinanti

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.52333/destek.v14i1.1704

Abstract

Suatu sistem tenaga listrik berperan untuk menyalurkan energi listrik yang dibangkitkan oleh generator ke konsumen-konsumen yang membutuhkan energi listrik tersebut. Salah satu tindakan pengamanan pada suatu sistem tenaga listrik yang diperlukan yaitu menjaga agar jaringan transmisi dan distribusi tidak mengalami pembebanan lebih bila terdapat satu atau beberapa elemen dari sistem tersebut mengalami gangguan. Untuk menjaga agar sistem tenaga tetap aman beroperasi walaupun terdapat satu atau beberapa elemennya mengalami gangguan diperlukan suatu analisa sistem tenaga. Hasil studi aliran daya dengan ETAP (Electrical Transient Analysis Program) pada jaringan 70 kV PLN WS2JB Palembang secara umum masih tetap aman. Dari hasil perhitungan didapat nilai arus terbesar 336A pada saluran 1-7 dan terjadi gangguan pada kondisi saluran 1-4. Untuk gangguan tiga fasa arus terbesar terjadi saat ada gangguan di bus 1 yaitu sebesar 9,938 kA. Untuk gangguan satu fasa ke tanah arus terbesar terjadi saat ada gangguan di bus 2 yaitu sebesar 3,780 kA
Pengaruh Variasi Pembebanan Pada Kinerja Transformator 60 MVA di PT. PLN Gardu Induk Keramasan Moh. Wahyu Aminullah; Legi Putra; Alisha Gita Gumilang; Muhammad Hurairah
Jurnal Surya Energy Vol. 10 No. 2 (2026)
Publisher : Teknik Elektro, Universitas Muhammadiyah Palembang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.32502/jse.v10i2.1619

Abstract

Gardu Induk Keramasan melayani sistem distribusi tenaga listrik dengan pola pembebanan yang bersifat fluktuatif setiap harinya. Fluktuasi beban tersebut berpotensi menimbulkan rugi-rugi daya pada transformator, yang selanjutnya menghasilkan panas dan dapat memengaruhi nilai efisiensi operasional transformator. Penelitian ini bertujuan untuk menganalisis pengaruh fluktuasi beban terhadap efisiensi transformator tenaga berkapasitas 60 MVA pada transformator 150/20 kV di Gardu Induk Keramasan. Metode penelitian yang digunakan meliputi identifikasi dan perumusan masalah, studi literatur dari berbagai sumber ilmiah dan laporan teknis, serta observasi langsung di lapangan untuk memperoleh data pembebanan harian, daya input, dan daya output transformator.Hasil analisis menunjukkan bahwa meskipun terjadi fluktuasi beban, pengaruhnya terhadap efisiensi transformator relatif kecil dan tidak signifikan. Nilai efisiensi tertinggi tercatat pada minggu ke-4 yaitu sebesar 98,59% dengan daya input 7828,77 kW, sedangkan nilai efisiensi terendah tercatat pada minggu ke-2 sebesar 98,46% dengan daya input 7198,74 kW, sehingga terjadi penurunan sebesar 0,14%. Rata-rata efisiensi transformator selama periode pengamatan adalah 98,56%. Jika diabdningkan dengan standar efisiensi transformator tenaga menurut SPLN 61:1997 yang ditetapkan oleh PLN, yaitu sebesar ≥ 98,6% pada kondisi beban nominal untuk transformator daya besar, mana nilai rata-rata hanya berbeda sedikit dibawah standar sebesar 0,04%. Secara umum kondisi operasional transformator 60 MVA di Gardu Induk Keramasan masih tergolong baik dan andal dalam mendukung sistem distribusi tenaga listrik.
Integration of Analysis Power Flow, Short Circuits, and Coordination Relays on the System Power Distribution: A Systematic Literature Review Thriskadewi Umi Rasyda; Alisha Gita Gumilang
ENERGY: JURNAL ILMIAH ILMU-ILMU TEKNIK Vol. 16 No. 2 (2026): ENERGY: JURNAL ILMIAH ILMU-ILMU TEKNIK (July-November 2026 Edition)
Publisher : Universitas Panca Marga

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.51747/energy.v16i2.p418-430

Abstract

This literature review comprehensively examines the integration of power flow analysis, short-circuit analysis, and relay coordination in electrical power distribution systems. Drawing upon 25 peer-reviewed journal articles and textbooks published between 2015 and 2023, this review synthesizes methodologies, findings, and trends across three interrelated domains. Power flow analysis underpins system planning and operational efficiency; short-circuit analysis ensures equipment rating adequacy and safety; and protective relay coordination guarantees selective fault isolation and system continuity. The increasing penetration of distributed generation (DG), photovoltaic (PV) systems, and battery energy storage (BESS) presents unprecedented challenges to traditional protection paradigms, necessitating adaptive and integrated analytical approaches. This review identifies research gaps, highlights emerging tools such as heuristic optimization and smart-grid-enabled adaptive protection, and proposes directions for future integrated distribution system analysis frameworks.
Modeling Adaptive Interference Management in Ultra-Dense Networks Assisted by Reconfigurable Intelligent Surfaces Using Dynamic Soft-FFRR and Clustering Alisha Gita Gumilang; Moh Wahyu Aminullah; Thriska Dewi Umi Rasyda; M. Rayhan Al-Fiansha; Ate Nurjana
Jurnal Teknik Elektro Indonesia Vol 7 No 2 (2026): JTEIN: Jurnal Teknik Elektro Indonesia
Publisher : Departemen Teknik Elektro Fakultas Teknik Universitas Negeri Padang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24036/jtein.v7i2.857

Abstract

Ultra-Dense Networks (UDN) and Reconfigurable Intelligent Surfaces (RIS) have emerged as two pivotal technologies for meeting the growing demand for network capacity and service quality. UDN boosts capacity by densely deploying femtocells, whereas RIS broadens coverage by relaying obstructed signals toward the receiver. However, the dense femtocell deployment introduces co-tier and cross-tier interference, and the reflective nature of RIS aggravates this problem, since interfering signals are likewise steered toward the receiver. To overcome this, the present study proposes an adaptive interference management scheme that combines dynamic clustering and Soft Fractional Frequency Reuse (Soft-FFR) within a RIS-assisted UDN. Clustering suppresses co-tier interference, while re-clustering and channel allocation are triggered by the network state, namely the estimated SINR and service zone of each femtocell. Four system models baseline, Dynamic Clustering, dynamic Soft-FFR, and the proposed integration were simulated on a three-macrocell network with up to 330 femtocells. The proposed method achieves the best overall performance among the evaluated schemes. Compared with the baseline, the SINR CDF at 20 dB falls from 64% to 43% and the throughput CDF at 70 Mbps decreases from 84% to 62%, indicating that a substantially larger proportion of users attain high SINR and throughput. The spectral efficiency at 330 HeNBs increases from 5.9 to 6.9 bit/s/Hz, and the bit error rate is reduced from about 0.13 to 0.05. These results confirm that adaptively integrating Dynamic Clustering and Soft-FFR effectively suppresses both co-tier and cross-tier interference, thereby improving the reliability and spectral efficiency of dense RIS-assisted UDNs.
Co-Authors Ate Nurjana Aziz, Azrina Abd Helmy Fitriawan Hurairah, Muhammad Legi Putra M. Rayhan Al-Fiansha Misfa Susanto Moh Wahyu Aminullah Moh. Wahyu Aminullah Rasyda, Thriskadewi Umi Thriska Dewi Umi Rasyda Thriska Dewi Umi Rasyda