VOL. 10, NO. 19, OCTOBER 2015 ISSN 1819-6608 ARPN Journal of Engineering and Applied Sciences © 2006-2015 Asian Research Publishing Network (ARPN). All rights reserved. www.arpnjournals.com 9020 INVERTERS TESTING WITH TMS320F28335 USING SIMULINK BLOCK MATHEMATICAL MODELS Shamsul Aizam Zulkifli, Muhammd Faddil Ahmad Rebudi and Mohd Quzaifah Department of Electrical Power Engineering, Faculty of Electrical and Electronics Engineering, Universiti Tun Hussein Onn Malaysia (UTHM), Parit Raja, Batu Pahat, Johor. D. T, Malaysia E-Mail: aizam@uthm.edu.my ABSTRACT This paper presents the usage of MATLAB-Simulink block diagram in order to create a controller block diagram based on mathematical equation and to be used as a tested controller for the inverters. The controllers which are the PI and PID controller have been used and been downloaded to the TMS320F28335 microcontroller board. These controllers and microcontroller have been applied to the three phase inverter and to the 2-level three phase multi-level-inverter. From the results, its show that, the controllers that been designed using the Simulink block diagram are able to communicate with the microcontroller for controlling the voltage output at the inverters. Keywords: MATLAB-Simulink, 3 phase inverter, multilevel inverter, TMS320F28335. INTRODUCTION Recently, more and more advanced control theories have been adapted to the operation of the power electronic converters just using the mathematical equations. These controllers can be tested to the converters if a suitable microcontroller has been selected in order to be a medium of interfacing between the hardware and the software part. Generally, controller can be divided into two main groups that are conventional controller and unconventional controller. The examples of conventional controller such as Proportional (P), Proportional- Integration (PI), Proprotional-Derivative (PD), Proportional-Integration-Derivative (PID) and Otto-Smith controller (Vukic, 2012). As a result for these controllers, a mathematical model for the control process is needed in order to be used as a controller. Meanwhile, combination of several controllers such as PI and PD controllers are very often in practical systems while the PID controller can be integrated with inverter to ensure a stable output voltage (Ari et al. 2012). Meanwhile, the examples of unconventional controller are fuzzy controller and neuro- fuzzy controller’s controller (Vukic, 2012). Power inverters such as a three phase inverter and multilevel inverter are widely used in industrial application. These converters can provide variable outputs voltage that are required by the load. For an example, the inverter is used to change from the DC input source to the AC output voltage (Zulkifli, et al. 2015b). Nevertheless, in order to minimize the losses at the transformer, a converter that operates in transformerless mode but with higher voltage output from the input has been introduced in 1974 by (Baker and Bannister, 1975) which is known as multilevel inverter. Multilevel inverter is a series of power semiconductor switches with several low voltage DC sources to perform the increase power conversion by synthesizing a staircase voltage waveform (Khomfoi and Toolbert accessed on July 2014). It begins with the three – level converter and since then, several topologies have been developed (Nabae et al. 1981). Among the widely used topology is cascaded H – bridge inverter with separate dc sources, diode clamped and flying capacitors. The advantages of having multilevel inverter compare to single level inverter are the waveform quality which has low distortion level at the output and the input current will reduce the dv/dt stresses on semiconductor devices and reducing electromagnetic concern on switching operations (Mohan et al. 2003), (Agrawal, 2011), (Baker and Bannister, 1975), (Khomfoi and Toolbert, 2014), (Rodriguez et al., 2002). TMS320F28335 is a family of C2000 microcontroller that been developed by the Texas Instruments (TI) (Texas Instrument, 2006). This board has ability to communicate with the MATLAB-Simulink block diagram as a working condition for the operation of the microcontroller same as others low cost microcontrollers such as Arduino (Zulkifli, et al. 2015a), (Zulkifli, et al. 2015), (Zulkifli et al. 2015b), (Zulkifli et al. 2015c). This advantage has created a simple solution for the beginner engineer, to understand the process between the microcontroller and the control strategy. It also makes, the control theory which is mostly based to complex mathematical formulation can be designed in Simulink blocks and then downloaded to the microcontroller after these blocks have been changed to C language codes by MATLAB. In this paper, two power inverters have been build and tested in order to see the capability of the TI microcontroller and the Simulink block in generating the output waveform at the inverters. The first test, a 3 phase inverter with PID voltage controller was tested. The second test was conducted to the multilevel inverter with 2-level inverter output. This multilevel inverter uses a current feedback response with the PI controller strategy whereas able to reduce the input error at the controller (Zulkifli, et al. 2014)