http://www.iaeme.com/IJEET/index.asp 1 editor@iaeme.com International Journal of Electrical Engineering & Technology (IJEET) Volume 9, Issue 5, September-October 2018, pp. 1–11, Article ID: IJEET_09_05_001 Available online at http://www.iaeme.com/IJEET/issues.asp?JType=IJEET&VType=9&IType=5 ISSN Print: 0976-6545 and ISSN Online: 0976-6553 Journal Impact Factor (2016): 8.1891 (Calculated by GISI) www.jifactor.com © IAEME Publication SIMULATION STUDIES ON AUTOTRANSFORMER RECTIFIER UNIT FOR AIRCRAFT APPLICATIONS Harshitha G B Lecturer, Department of Electrical and Electronics Engineering, UBDT College of Engineering, Davangere, India Adithya Ballaji Teaching Associate, School of Electrical and Electronics Engineering, REVA University, Bengaluru, India ABSTRACT The need of High Voltage DC (HVDC) in aircraft is increasing due to use of electric power to drive aircraft subsystems such as an actuators which are used in landing gears, flap angle and rudder system of an aircraft. Actuators are mainly operated with a high DC voltage of 270V as an input power supply requirement. But in the conventional aircraft, DC voltage generation is limited to 28V by using transformer rectifier unit (TRU). So to cope up with the requirement, an additional conversion unit of Autotransformer Rectifier Unit (ATRU) is necessary. This paper presents study on ATRU. ATRU is a essential component of aircraft Electrical Power System (EPS). ATRU is fed with three-phase 115V 400 Hz AC voltages and converts to high DC voltage of 270V which is designed to supply high voltage DC bus of aircraft EPS. ATRU generates 270V DC with less harmonic contents. The DC voltage can be generated by using 18-pulse ATRU and 24-pulse ATRU. Hence, an 18-pulse & 24- pulse ATRU was designed modeled and simulated using the MATLAB-Simulink Software to understand the influence of harmonic contents. Key words: Autotransformer Rectifier Unit (ATRU), Electrical Power System (EPS), Radio Technical Commission for Aeronautics (RTCA), Total Harmonics Distortion (THD). Cite this Article: Harshitha G B and Adithya Ballaji, Simulation Studies on Autotransformer Rectifier Unit for Aircraft Applications. International Journal of Electrical Engineering & Technology, 9(5), 2018, pp. 1–11. http://www.iaeme.com/IJEET/issues.asp?JType=IJEET&VType=9&IType=5 1. INTRODUCTION Increasing use of electric power to drive aircraft subsystems such as an actuator has led to generation of HV voltage DC. Actuator is mainly operated with a high DC voltage (270V) as an input power supply requirement. But in the conventional aircraft, DC voltage generation is