Implementasi Interleaved SEPIC Converter pada Charging Controller untuk Aplikasi Penyimpanan Energi di Sistem Fotovoltaik

Fatoni, Muhamad Nur (2026) Implementasi Interleaved SEPIC Converter pada Charging Controller untuk Aplikasi Penyimpanan Energi di Sistem Fotovoltaik. Other thesis, Institut Teknologi Sepuluh Nopember.

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Abstract

Peningkatan pemanfaatan sistem fotovoltaik memerlukan charging controller yang mampu mengatur proses pengisian baterai secara stabil dan aman meskipun terjadi perubahan tegangan masukan. Penelitian ini bertujuan merancang dan mengimplementasikan Interleaved SEPIC Converter sebagai charging controller pada sistem penyimpanan energi berbasis fotovoltaik menggunakan metode pengisian Constant Current–Constant Voltage (CC–CV) dengan pengendali Proportional Integral (PI) berbasis mikrokontroler ESP32. Sistem dirancang menggunakan dua sinyal PWM dengan frekuensi switching 50 kHz dan pergeseran fasa 180° untuk mengendalikan dua fase Interleaved SEPIC Converter. Pengujian dilakukan meliputi karakteristik open-loop converter, efisiensi converter, pengendalian arus dan tegangan, serta pengujian proses pengisian baterai menggunakan metode CC–CV.Hasil penelitian menunjukkan bahwa Interleaved SEPIC Converter berhasil diimplementasikan sebagai charging controller dan mampu menghasilkan tegangan keluaran yang dapat diatur pada rentang 0–40 V. Pengujian mode Constant Current (CC) menunjukkan bahwa pengendali PI memberikan performa yang lebih baik dibandingkan PID. Pada setpoint 400 mA, sistem menghasilkan rise time 2,65 s, overshoot 34,44%, settling time 15,55 s, dan steady-state error 1,41%, sedangkan pada setpoint 500 mA diperoleh rise time 1,70 s, overshoot 19,07%, namun sistem belum mencapai kondisi tunak dengan steady-state error sebesar 9%. Pada mode Constant Voltage (CV), sistem mampu mempertahankan tegangan keluaran mendekati nilai referensi dengan overshoot maksimum sekitar 0,6% dan respons yang stabil. Pengujian pengisian baterai menunjukkan bahwa sistem berhasil menerapkan metode CC–CV, yaitu mempertahankan arus pengisian sebesar 2 A pada mode CC, beralih secara otomatis ke mode CV pada tegangan 14 V, serta menghentikan pengisian ketika arus turun hingga sekitar 0,5 A sebagai indikator baterai mendekati kondisi penuh. Pengujian efisiensi menunjukkan nilai efisiensi konverter berada pada rentang 32,54%–51,17%, sehingga masih diperlukan optimasi pada rancangan perangkat keras maupun parameter pengendali untuk meningkatkan efisiensi sistem. Secara keseluruhan, hasil penelitian membuktikan bahwa sistem yang dikembangkan telah berhasil mengimplementasikan fungsi charging controller berbasis Interleaved SEPIC Converter dengan metode CC–CV untuk aplikasi penyimpanan energi pada sistem fotovoltaik.
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The increasing utilization of photovoltaic (PV) systems requires a charging controller capable of regulating the battery charging process safely and stably under varying input voltage conditions. This study aims to design and implement a two-phase Interleaved Single-Ended Primary Inductor Converter (SEPIC) as a charging controller for photovoltaic-based energy storage systems using the Constant Current–Constant Voltage (CC–CV) charging method with a Proportional–Integral (PI) controller implemented on an ESP32 microcontroller. The proposed system employs two PWM signals operating at a switching frequency of 50 kHz with a 180° phase shift to drive the two converter phases. The experimental evaluation includes open-loop converter characterization, converter efficiency testing, current and voltage control performance, and battery charging tests using the CC–CV method.The experimental results demonstrate that the proposed Interleaved SEPIC Converter was successfully implemented as a charging controller and was capable of producing an adjustable output voltage ranging from 0 to 40 V. In the Constant Current (CC) mode, the PI controller outperformed the PID controller. At a 400 mA current setpoint, the PI controller achieved a 2.65 s rise time, 34.44% overshoot, 15.55 s settling time, and 1.41% steady-state error. At a 500 mA setpoint, the system achieved a 1.70 s rise time with 19.07% overshoot, although the response did not reach steady-state, resulting in a 9% steady-state error. In the Constant Voltage (CV) mode, the system maintained the output voltage close to the reference value with a maximum overshoot of approximately 0.6% while exhibiting stable operation. Battery charging experiments confirmed the successful implementation of the CC–CV charging strategy by maintaining a charging current of 2 A during the CC stage, automatically transitioning to the CV stage at 14 V, and terminating the charging process when the charging current decreased to approximately 0.5 A, indicating that the battery was approaching a fully charged condition. The measured converter efficiency ranged from 32.54% to 51.17%, indicating that further optimization of the hardware design and controller parameters is required to improve the overall system efficiency. Overall, the proposed system successfully demonstrates the implementation of an Interleaved SEPIC Converter-based charging controller employing the CC–CV charging method for photovoltaic energy storage applications.

Item Type:	Thesis (Other)
Uncontrolled Keywords:	Interleaved SEPIC Converter, Charging Controller, Fotovoltaik, ESP32, PI/PID Controller, CC-CV.Interleaved SEPIC Converter, Charging Controller, Photovoltaic System, ESP32, PI/PID Controller, Constant Current–Constant Voltage (CC–CV)
Subjects:	T Technology > TK Electrical engineering. Electronics Nuclear engineering > TK2943 Battery chargers.
Divisions:	Faculty of Electrical Technology > Electrical Engineering > 20201-(S1) Undergraduate Thesis
Depositing User:	Muhamad Nur Fatoni
Date Deposited:	28 Jul 2026 01:38
Last Modified:	28 Jul 2026 01:38
URI:	http://repository.its.ac.id/id/eprint/138182

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