Perancangan dan Implementasi Sliding mode Controller untuk Regulasi Tegangan DC pada Sistem Plasma Candle Berbasis High Frequency Solid State Tesla Coil

Firdaus, Naufal Abror Fawwaz Firdaus (2026) Perancangan dan Implementasi Sliding mode Controller untuk Regulasi Tegangan DC pada Sistem Plasma Candle Berbasis High Frequency Solid State Tesla Coil. Diploma thesis, Institut Teknologi Sepuluh Nopember.

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Abstract

High Frequency Solid State Tesla Coil (HFSSTC) merupakan sistem pembangkit tegangan tinggi berfrekuensi tinggi yang digunakan sebagai basis sistem plasma candle. Tegangan masukan DC yang diberikan ke sistem HFSSTC sangat mempengaruhi kestabilan nyala plasma yang dihasilkan. Tanpa sistem kendali, perubahan kondisi operasi dan karakteristik nonlinier impedansi akibat efek pembebanan plasma (Plasma Loading Effect) menyebabkan tegangan keluaran berfluktuasi tajam, sehingga plasma menjadi tidak stabil dan berpotensi padam. Penelitian ini merancang dan mengimplementasikan algoritma Incremental Sliding mode Controller (SMC) dengan proteksi anti-chattering untuk meregulasi tegangan DC pada tingkat ekstrem 50V. Identifikasi model pada titik operasi tinggi menemukan penyusutan nilai Gain ekuivalen akibat isapan daya plasma, menghasilkan model fungsi alih G(s) = 0.0849/(0.0813s + 1). Berdasarkan model diskret dari fungsi alih tersebut (dengan a = 0.2926, b = 0.0601), dirancang topologi kendali berbasis Proportional-Derivative (PD) Sliding surface dengan fungsi penghalus sigmoidal (parameter δ = 0.5) dan parameter kelajuan perpindahan (Ks = 2.0). Algoritma ini juga dilengkapi dengan Slew Rate Limiter 0.5% per siklus untuk melindungi saklar MOSFET dari lonjakan daya.Hasil implementasi pada perangkat keras menunjukkan bahwa SMC berhasil meregulasi tegangan pada setpoint target 50V tanpa steady-state error. Pada pengujian pelacakan referensi (setpoint tracking) ke 45V dan kembali ke 50V, respons transisi berlangsung sangat mulus tanpa adanya overshoot berbahaya. Pada uji penolakan gangguan (Disturbance rejection), sistem terbukti tangguh mengatasi jatuhnya tegangan sumber (Voltage Sag) dan Plasma Loading Effect dengan memodulasi Duty cycle secara eksponensial hingga batas 71.5%, memastikan tegangan aktual tetap kokoh terkunci di 50V.
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High-Frequency Solid-State Tesla Coil (HFSSTC) is a high-frequency, high-voltage generation system used as the core component of a plasma candle system. The DC input voltage supplied to the HFSSTC significantly affects the stability of the generated plasma. Without a control system, changes in operating conditions and the nonlinear impedance characteristics caused by the plasma loading effect result in sharp output voltage fluctuations, producing unstable plasma that is prone to extinguishing. This study designs and implements an Incremental Sliding Mode Controller (SMC) equipped with an advanced anti-chattering mechanism to regulate the DC voltage at an operating level of 50 V. System identification at high operating points revealed a substantial reduction in the equivalent gain due to plasma power absorption, resulting in the transfer function model (G(s)=0.0849/(0.0813s+1)). Based on the discrete representation of this transfer function (with (a=0.2926) and (b=0.0601)), a proportional-derivative (PD) sliding surface control topology was developed using a sigmoidal smoothing function (δ = 0.5) and a switching gain parameter (Ks = 2.0). The controller also incorporates a slew rate limiter of 0.5% per control cycle to protect the MOSFET switches from power surges. Hardware implementation demonstrated that the proposed SMC successfully regulated the output voltage at the 50 V setpoint with zero steady-state error. During reference tracking tests, in which the setpoint was changed from 50 V to 45 V and then returned to 50 V, the controller exhibited a smooth transient response without hazardous overshoot. Disturbance rejection tests further confirmed the robustness of the proposed system against voltage sag and the plasma loading effect by adaptively increasing the duty cycle up to the 71.5% limit, thereby maintaining the output voltage consistently at the desired 50 V setpoint.

Item Type:	Thesis (Diploma)
Uncontrolled Keywords:	Incremental Sliding mode Controller, HFSSTC, Plasma Loading Effect, fungsi sigmoidal, disturbance rejection, kendali tegangan DC.Incremental Sliding mode Controller, HFSSTC, Plasma Loading Effect, sigmoidal function, disturbance rejection, DC voltage Control.
Subjects:	T Technology > TK Electrical engineering. Electronics Nuclear engineering > TK3070 Automatic control
Divisions:	Faculty of Electrical Technology > Electrical Engineering > 20201-(S1) Undergraduate Thesis
Depositing User:	Naufal Abror Fawwaz Firdaus
Date Deposited:	27 Jul 2026 08:57
Last Modified:	27 Jul 2026 08:59
URI:	http://repository.its.ac.id/id/eprint/137862

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