Pemodelan dan Pengendalian Berbasis Simulasi pada Penyearah ANPC Satu Fasa Tiga Sel Kaskade di PLECS

Kamil, Achmad Hisyam (2026) Pemodelan dan Pengendalian Berbasis Simulasi pada Penyearah ANPC Satu Fasa Tiga Sel Kaskade di PLECS. Other thesis, Institut Teknologi Sepuluh Nopember.

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Abstract

Penelitian ini membahas pemodelan dan pengendalian berbasis simulasi penyearah active neutral-point-clamped (ANPC) satu fasa tiga sel kaskade menggunakan PLECS. Sistem terdiri dari tiga sel ANPC yang dikaskadekan pada sisi AC dan setiap sel memiliki dua kapasitor DC-link terpisah serta enam saklar aktif. Tujuan penelitian adalah mengatur tegangan DC-bus total, menjaga pembagian tegangan antar sel, dan menekan ketidakseimbangan tegangan neutral-point pada tiap sel. Sistem kendali mencakup loop tegangan DC-bus luar, loop arus dalam, PWM simetris, serta logika penyeimbangan neutral-point lokal. Loop tegangan menghasilkan referensi arus aktif, sedangkan loop arus menghasilkan perintah tegangan modulasi. Logika penyeimbangan menggunakan selisih tegangan kapasitor terfilter, sinyal relai, polaritas arus sumber, dan pemilihan jalur zero-state redundant, yang divalidasi melalui verifikasi forced-state berdasarkan arah arus sumber. Hasil simulasi menunjukkan bahwa kendali mampu mengatur tegangan DC-bus total dan menjaga pembagian tegangan antar sel. Pada beban nominal R_L=25.6 Ω, THD arus sumber sekitar 6%, sedangkan pada beban berat R_L=12.8 Ω, THD meningkat hingga sekitar 33%. Pengujian perubahan referensi tegangan dan beban menunjukkan sistem tetap stabil. Pengujian dengan tegangan awal kapasitor tidak seimbang juga menunjukkan bahwa metode yang diusulkan mampu mengurangi ketidakseimbangan awal dan menjaga ΔV_(NP,k) tetap terbatas. Dengan demikian, desain ini berhasil sebagai implementasi awal untuk regulasi tegangan DC-bus dan penyeimbangan neutral-point, meskipun kualitas arus pada beban berat masih perlu ditingkatkan.
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This final project presents a simulation-based modeling and control study of a single-phase three-cell cascaded active neutral-point-clamped (ANPC) rectifier in PLECS. The system consists of three ANPC cells connected in cascade on the AC side, and each cell contains two split DC-link capacitors and six active switches. This study aims to regulate the total DC-bus voltage, maintain voltage sharing among the cells, and reduce the neutral-point voltage imbalance within each cell. The control system includes an outer DC-bus voltage loop, an inner current loop, symmetrical PWM, and local neutral-point balancing logic. The outer loop generates the active current reference, while the inner loop produces the modulation voltage command. The balancing logic uses the filtered capacitor-voltage difference, relay-based imbalance detection, source-current polarity, and redundant zero-state selection, validated through forced-state verification based on the source-current direction. Results show that the proposed controller can regulate the total DC-bus voltage and maintain voltage sharing among the three cells. Under the nominal load of R_L=25.6 Ω, the source-current THD is approximately 6%, while under the heavy load of R_L=12.8 Ω, it increases to approximately 33%. The DC reference-step and load-step tests show that the converter remains stable during transients. The neutral-point balancing test with unequal initial split-capacitor voltages also shows that the proposed method can reduce the initial mismatch and keep ΔV_(NP,k) bounded. Therefore, the proposed design is successful as an initial implementation for DC-bus regulation and neutral-point voltage balancing, although the source-current quality under heavy load still requires improvement.

Item Type:	Thesis (Other)
Uncontrolled Keywords:	ANPC, konverter multilevel, penyeimbangan neutral-point, PLECS, THD, multilevel converter, neutral-point balancing
Subjects:	T Technology > TK Electrical engineering. Electronics Nuclear engineering > TK7872 Electric current converters, Electric inverters.
Divisions:	Faculty of Intelligent Electrical and Informatics Technology (ELECTICS) > Electrical Engineering > 20201-(S1) Undergraduate Thesis
Depositing User:	Achmad Hisyam Kamil
Date Deposited:	30 Jul 2026 02:41
Last Modified:	30 Jul 2026 02:41
URI:	http://repository.its.ac.id/id/eprint/137689

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