Indonesian Journal of Electrical Engineering and Computer Science Vol. 26, No. 2, May 2022, pp. 648~655 ISSN: 2502-4752, DOI: 10.11591/ijeecs.v26.i2.pp648-655  648 Journal homepage: http://ijeecs.iaescore.com Comparison of DC-DC converters for solar power conversion system Debani Prasad Mishra 1 , Rudranarayan Senapati 2 , Surender Reddy Salkuti 3 1 Department of Electrical Engineering, IIIT Bhubaneswar, Bhubaneswar, India 2 Department Electrical Engineering, KIIT Deemed to be University, Bhubaneswar, India 3 Department of Railroad and Electrical Engineering, Woosong University, Daejeon, Republic of Korea Article Info ABSTRACT Article history: Received Jul 21, 2021 Revised Mar 9, 2022 Accepted Mar 15, 2022 This paper covers the comparison between four different DC-DC converters for solar power conversion. The four converters are buck converter, buck- boost converter, boost converter, and noninverting buck-boost converter. An maximum power point tracking (MPPT) algorithm is designed to calculate battery voltage, current of photovoltaic (PV) array, the voltage of PV array, power of PV array, output power. It is observed that the non-inverting buck- boost converter is the finest converter for solar power conversion. The final circuit design has the results of 12.2 V battery voltage, 0.31 A current of PV array, 34 V voltage of PV array, 23 mW power of PV panel, and 21.8 mW of output power. The efficiency of this system is nearly 95%. All four circuits are simulated in MATLAB/Simulink R2020b. Keywords: DC-DC power converters MPPT algorithm Non-inverting buck-boost Photovoltaic systems PV panel This is an open access article under the CC BY-SA license. Corresponding Author: Surender Reddy Salkuti Department of Railroad and Electrical Engineering, Woosong University 17-2, Jayang-Dong, Dong-Gu, Daejeon-34606, Republic of Korea Email: surender@wsu.ac.kr 1. INTRODUCTION The world has a keen interest in collecting knowledge about the earth, its neighboring planets, and moons of different planets, the sun, and also different galaxies. This all can be possibly done by space exploration. NASA has done some phenomenal work on nuclear power systems [1]. Space exploration is done by satellites that need electrical power to do their required work [2]. In recent years there have been several satellites launched in space for scientific research [3], mobile communication, remote sensing, mapping of an area, navigation of ships, vehicles, planes, and drones. In space, satellites need electrical power which can only be provided by solar energy. Tennakoon et al. [4], there is an explanation about maximizing solar energy uses. Satellites need to convert solar energy to electrical energy and need to store energy to do their required work. Mars Rover is one of the examples of this process [5]. Some evolutionary computing techniques were also used to reduce the cost of satellites or other spacecraft [6]. The electric power system is explained in reference [7]. In the energy conversion process from solar to electric, DC microgrid and DC-DC converters come into play. Some research was also done for DC-microgrids for space application [8]. D’Antonio et al. [9], some mathematical approach was used to decrease the overall mass of the power system used in space exploration. Baharudin et al. [10] a photovoltaic (PV) power system is presented which is of high efficiency and has a very compact design. Several types of DC-DC converters can be used in solar power conversion microgrids [11]. A microgrid is a local energy grid that is self-sufficient and has control over itself. It can connect and disconnect from the main grid and can operate on its own. Renewable resources like wind energy, solar