International Journal of Power Electronics and Drive Systems (IJPEDS) Vol. 13, No. 1, March 2022, pp. 423~431 ISSN: 2088-8694, DOI: 10.11591/ijpeds.v13.i1.pp423-431  423 Journal homepage: http://ijpeds.iaescore.com Comparison of sliding mode controller application for buck- boost converter based on linear sliding surface Lunde Ardhenta, Tri Nurwati Department of Electrical Engineering, Universitas Brawijaya, Malang, Indonesia Article Info ABSTRACT Article history: Received Jul 30, 2021 Revised Jan 24, 2022 Accepted Jan 31, 2022 In the utilization of photovoltaic (PV), the output voltage produced is unstable because the conditions of irradiation received by PV is not uniform. Therefore, a direct current (DC) voltage converter is needed as an output voltage regulator. In this research, buck-boost converter is proposed to regulate the desired output voltage. The proposed controller in this research is a sliding mode controller (SMC) and employ a linear sliding surface to maintain the regulated voltage stable. This research was conducted by determining the component parameters and state space model of the buck- boost converter. Proportional integral derivative (PID) controller with integral of time-weighted absolute error (ITAE) method is used as a comparison of the proposed method. The performance results were observed from the buck-boost converter by performing 3 fault scenarios, variation in supply voltage, resistor in load side, and the desired output voltage. The results obtained of SMC has a faster settling time than PID controller. The voltage deviation of buck-boost converter exhibits that SMC is smaller than the PID control. In addition, under some experiment conditions, the PID control could not or did not fit in some scenarios while the output control values of SMC matched the changes in the entire scenarios. Keywords: Buck-boost converter Linear sliding surface Proportional integral derivative Integral of time-weighted absolute error Sliding-mode control This is an open access article under the CC BY-SA license. Corresponding Author: Lunde Ardhenta Department of Electrical Engineering, Universitas Brawijaya MT Haryono St. 167 Malang, Indonesia Email: lunde.ardhenta@ub.ac.id 1. INTRODUCTION Utilization of renewable energy resources (RER) to be converted into electrical energy is currently growing rapidly. This is due to the increasing demand for electricity but the supply of fossil energy is decreasing. The potential resource is currently being widely applied is solar cells or photovoltaic (PV) [1]. PV is a device or component that works based on the photoelectric effect on a semiconductor material to convert light energy into electrical energy [2]. However, one of the obstacles in the utilization of PV is the unstable generated voltage. This is because the voltage generated depends on the condition of the intensity of sunlight received by the PV at all times. Whereas in general, electronic devices have specification limits for voltage variations, frequency variations, and harmonic distortion [3]. If the unstable voltage output continues to be ignored, it will result in less than optimal usage and can accelerate damage to electronic equipment. Most of the electricity generated by RER, such as PV, is direct current (DC) voltage. In order to accomplish this problem, developing a DC-DC converter to stabilize the regulated voltage is most important [4]. There are several types of basic converter that have different capabilities which are step-down converter (buck converter), step-up converter (boost converter), and buck-boost converter. Buck-boost converter is DC voltage converter whose regulated voltage is invert value and is able to be set higher or lower than the supply voltage by using pulse width modulation (PWM). Currently, buck-