International Journal on Electrical Engineering and Informatics - Volume 13, Number 1, March 2021 A Hybrid Controller for Boost Inverter: Modeling, Simulation, and Experimental Results Anwar Muqorobin 1 , Tri Desmana Rachmildha 2 , Yanuarsyah Haroen 2 , and Estiko Rijanto 1 1 Research Center for Electrical Power and Mechatronics, Indonesian Institute of Sciences Jl. Sangkuriang, Bandung 40135, INDONESIA 2 School of Electrical Engineering and Informatics, Institut Teknologi Bandung Jl. Ganesha 10, Bandung 40132, INDONESIA anwa006@lipi.go.id Abstract: Some controls have been introduced to control boost inverter, e.g. linear control, sliding mode control, and energy shaping based control. In this paper, the authors propose boost inverter control based on hybrid model. It is easier to design because it does not require complex mathematical formula. Simulations and experiments have been conducted to determine the performance of the proposed control under steady state and during transient state with a variety of load, inductance, and capacitance. The simulation and experimental results show that the hybrid control can work properly. Keywords: Boost inverter, hybrid model, and control. 1. Introduction Inverters are widely used in various applications such as uninterruptible power supply (UPS), motor drive, and utility interface. Buck inverter is commonly used to obtain an AC output from a DC source. One characteristic of this inverter is that the output voltage is lower than the DC input voltage. If the required voltage is greater than the input, a dc-dc boost converter must be added in the front of inverter [1]. The addition of dc-dc boost converter on buck inverter can increase the volume, weight, price, and losses. To avoid that, it is necessary to use boost inverter. Boost inverter can be made of two dc-dc boost converters with load placed on each output of the dc-dc boost converter [2]. Compared to buck inverter equipped with a dc-dc boost converter, boost inverter circuit requires less switching components. Boost inverter can generate voltage that is greater or smaller than the input voltage. As a result, this inverter is more suitable to generate variable AC voltage with a wide range of amplitude variation. The control that is used in [2] is a sliding mode control. There are two controls for each dc- dc boost converter. The sliding surface is formed by the inductor current error and output voltage error. Inductor current error is obtained from the inductor current passed to a high pass filter. The filter cut-off frequency is below the switching frequency in order to pass the switching ripple effect. To avoid chattering phenomena, the authors used a hysteresis in the sliding surface. The principle of current mode control for boost inverter was proposed in [3]. The authors compared the proposed control with sliding mode control. Experiments have been conducted in the condition of input voltage variaton and short circuit. The experimental results showed that the sliding mode control cannot work properly when the input voltage changed and produces large transient currents during a short circuit. On the other hand, the control proposed in [3] could work well under those two conditions. A control method based on small-signal analysis has been introduced in [4]. The advantage of the control is that it only need a voltage sensor. The system is modeled by using a small signal model around the duty cycle of 0.5. Simulation results showed that the proposed control could work well when the input voltage changed. Energy shaping control also has been published [5]. However, this control uses a very complicated mathematical formula. The other sliding mode control was proposed in [6] to control both dc-dc converters simultaneously. Unlike some boost inverter controls that have been mentioned before, the proposed control only use a controller. The sliding surface consists of PI (Proportional and Received: December 11 st , 2020. Accepted: March 29 th , 2021 DOI: 10.15676/ijeei.2021.13.1.10 179