Ms. Nanda K Kannan, et. al. International Journal of Engineering Research and Applications www.ijera.com ISSN: 2248-9622, Vol. 11, Issue 8, (Series-II) August 2021, pp. 06-12 www.ijera.com DOI: 10.9790/9622-1108020612 6 | Page Neuro Fuzzy Inference System Controlled High Step-Up Gain DC-DC Converter Ms. Nanda K Kannan*, Prof. Thomas P Rajan**, Prof. Dinto Mathew***, Prof. Mohitha Thomas****, Prof. Emmanuel Babu P***** * ( Dept.of EEE, M A College of Engineering, Kothamangalam, Kerala, India) ** (Dept.of EEE, M A College of Engineering, Kothamangalam, Kerala, India) *** (Dept.of EEE, M A College of Engineering, Kothamangalam, Kerala, India) **** (Dept.of EEE, M A College of Engineering, Kothamangalam, Kerala, India) ***** (Dept.of EEE, M A College of Engineering, Kothamangalam, Kerala, India) ABSTRACT DC motors are widely used in many applications including household applications, automotive and industry work house. These are considered as adjustable speed machines. DC motor is fed by a DC-DC converter. In order to avoid the use of transformer, a step-up high gain DC-DC converter is introduced here by combining the switched capacitor and regenerative boost configuration. Thereby it drastically increases the dc voltage gain and enhances efficiency. Adaptive Neuro Fuzzy Inference System (ANFIS) technique is adopted for controlling the speed of the DC motor which is a fusion of artificial neural network and fuzzy logic principle, and is based on Tagaki-Sugeno fuzzy inference system. With the help of controller the System performance has improved and has better performance in both transient and steady state response. The performance study is carried out with MATLAB/SIMULINK R2017a. Keywords - DC-DC Converters, DC Motor, Adaptive Neuro Fuzzy Inference System (ANFIS) --------------------------------------------------------------------------------------------------------------------------------------- Date of Submission: 20-07-2021 Date of Acceptance: 04-08-2021 --------------------------------------------------------------------------------------------------------------------------------------- I. INTRODUCTION PV based traction system employ DC-DC converters for boosting the pv output voltage to required levels. Modern traction system uses DC motors and traction application requires high voltage levels (500V to 750V), hence conventional boost converters and conventional speed control methods are inadequate. In solar and/or wind energy conversion system the generation voltage level is so far from grid voltage. After voltage source inverter (VSI) stage, a transformer is used to step-up the AC voltage which leads to increase system volume and losses, larger size and decreases overall efficiency. In past years, everyone searched to eliminate the transformer and presented cascaded multilevel converter [1],[2]. It leads to increase in the device counts, complexity in control and penalty on efficiency. However, the converter presented in[3] must operate at lower duty ratio to support for higher conversion ratio and deteriorates the performance under transient conditions. The switched capacitor (SC) converters are the most common answer to achieve unlimited gain. When the switched capacitors are combined with classic boost type, the DC-voltage gain improves exponentially. The switched inductor (SI) type converter[4] applied to reduce the current ripple and avoid the problems associated with pulsating current. The DC motors installed on board of traction rail vehicles are predominantly series motors, because their characteristics are the most suitable for meeting the requirements of the drive systems of the vehicles are motor current is big at small rotational speeds, which means, that the motor holds a very big start-up torque, which is very advantageous, because the required speed can be reached more quickly. The motor can be over twice overloaded for a short period of time, which allows for obtaining big startup torque. Motor torque is not directly dependent on the motor supply voltage (in diesel locomotives the supply voltage from a traction alternator undergoes constant changes, because it is through the change of voltage that the locomotive velocity is controlled). Broad range of rotational speeds. The series motor is more robust, it is also more cost effective, and also cheaper and easier in maintenance. The dynamics of DC-DC converters are non linear and practical converter RESEARCH ARTICLE OPEN ACCESS