Current-Sensorless Method for Photovoltaic System Using Capacitor Charging Characteristics

Song-Do Ki, Cheol-Woong Choi, Jae-Sub Ko () and Dae-Kyong Kim ()
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Song-Do Ki: Department of Electrical Engineering, Sunchon National University, Suncheon-si 57922, Republic of Korea
Cheol-Woong Choi: Department of Electrical Engineering, Sunchon National University, Suncheon-si 57922, Republic of Korea
Jae-Sub Ko: Department of Electrical Engineering, Gangneung-Wonju National University, Wonju-si 26403, Republic of Korea
Dae-Kyong Kim: Department of Electrical Engineering, Sunchon National University, Suncheon-si 57922, Republic of Korea

Energies, 2024, vol. 17, issue 19, 1-12

Abstract: The installed capacity of photovoltaic (PV) systems has increased significantly over the past few decades, and related technologies have advanced significantly. The electrical characteristics of a PV system change nonlinearly based on irradiation and temperature, and the I–V characteristic curve, expressed in terms of the voltage and current, is used to verify these characteristics. The maximum power point tracking (MPPT) control method was applied to maximize the performance of the PV system. Voltage and current sensors are used to control the I–V characteristic curve and MPPT; however, current sensors have various disadvantages in terms of price and system configuration. Therefore, this study presents a method for calculating the current of a PV system using the charging characteristics of a capacitor. The method presented in this paper analyzes the I–V characteristic curve’s qualities through simulations and experiments under normal, shaded, and mismatched conditions of the PV module.

Keywords: photovoltaic; current sensor; capacitor; charging; I–V curve; current-sensorless (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2024
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