TY - JOUR T1 - FPGA BASED HARDWARE IMPLEMENTATION OF WTHD MINIMISATION IN ASYMMETRIC MULTILEVEL INVERTER USING BIOGEOGRAPHICAL BASED OPTIMISATION AU - Rangasamy, Kavitha AU - Thottungal, Rani PY - 2015 DA - March JF - IU-Journal of Electrical & Electronics Engineering PB - İstanbul University-Cerrahpasa WT - DergiPark SN - 1303-0914 SP - 1799 EP - 1807 VL - 14 IS - 2 LA - en AB - Harmonic Elimination and THD Minimisation in asymmetric cascaded multilevel inverter involves complex nonlinear non convex trigonometric transcendental equations which has several solutions.Among the various topologies of cascaded multilevel inverter asymmetric cascaded multilevel inverter has the advantage of reduced switch count when compared to traditional symmetric multilevel inverter topology. In this paper FPGA based hardware implementation is carried for a 13 level inverter by using offline computation of switching angle with weighted total harmonic distortion (WTHD) as the objective function. WTHD optimisation offers the blend of eliminating the specific lower order harmonics as in SHE-PWM and minimisation of THD as in OMTHD. The simulation and experimental results were presented for 7 level symmetric and 13 level asymmetric inverter. The experimental waveforms were analysed for THD and lower order harmonics using fluke power analyser and comparison of WTHD with SHE-PWM and OMTHD are presented .The results indicates that in a 13 level inverter the WTHD based optimisation yields reduced THD of 5.35% in simulation and 5.9% experimentally.It also eliminates all the specified 5th ,7th ,11th ,13th and 17th lower order harmonics. KW - WTHD KW - BBO KW - SHE- PWM KW - OMTHD CR - L. M. Tolbert, F. Z. Peng, and T. G. Habetler, “Multilevel converter for large electric drives,” IEEE Trans. Ind. Appl., vol. 35, no. 1, pp. 36–44, Jan./Feb. 1999. CR - Wang and F. Z. 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She is now working CR - Professor in Kumaraguru college of CR - Technology, India. She is a life member of CR - ISTE. Her research interests are Multilevel CR - inverters and Optimisation Techniques. CR - Dr.Rani Thottungal obtained her B.E and CR - M.E degree from Andhra University,India CR - and her Ph.D degree from Bharathiar CR - university,India. She has 23 years of CR - teaching Experience. She is currently CR - working as Professor in Kumaraguru CR - college of Technology,India. She is a life CR - member member of ISTE and IE. Her CR - research interests includes power system and FACTS. UR - https://dergipark.org.tr/en/pub/iujeee/issue//117089 L1 - https://dergipark.org.tr/en/download/article-file/99306 ER -