Two leg three-phase inverters (FSTPIs) have been proposed to be used in low-power; low-cost applications because of the reduced number of semiconductor devices, and space vector pulse width modulation (SVPWM) techniques have also been introduced to control FSTPIs. However, high-performance controllers are needed to implement complicated SVPWM algorithms, which limit their low-cost applications. To simplify algorithms and reduce the cost of implementation, an equivalent scalar method for SVPWM of FSTPIs is proposed. SVPWM for FSTPIs is actually a sine PWM by modulating two sine waves of 600 phase difference with a triangle wave, but in this method third harmonics doesn’t eliminated. So as to eliminate the third harmonics we have to compose a high frequency sine wave to on existing sine waves. So such a special sine PWM can be used to control FSTPIs. The Mathematical and simulation results demonstrate the validity of the proposed method. http://www.mathworks.com/matlabcentral/fileexchange/authors/126814

1. DIFFERENT PWM CONTROLLED BASED FSTPI FED IM DRIVE PRESENTED By SUDHAKAR AKKI Reg.No:1610910044 UNDER THE GUIDANCE OF Mr. NALINKANT MOHANTY ASST.PROF( Sr.G )

6. Block diagram of the project

14. Switching Time Table at Each Sector

15. Simulation Diagram of SVM 3leg inverter

16. Time durations T 1 , T 2 , T 0

17. Switching Times

18. Line voltages

21. SPACE VECTOR PWM FOR 2-LEG INVERTER

24. Determine the switching time of each transistor (S 1 to S 4 )

25. Switching Time for Each Sector of two-leg inverter

26. Simulation of 3phase to 2phase

27. Simulation for Sector Identification

28. Angle& Sectors Sector Angle Sector

29. Simulation circuit for 2 leg inverter by SVM

30. Switching time duration for two leg inverter

31. Connotative Modulation Functions for 2leg

32. Line Voltages

33. Third Harmonic Injection

34. Third Harmonic Injection to Switching Times

35. Third Harmonic Switching Times

36. Line voltages for 2 leg Inverter

37. Rotor & Stator currents

38. Speed& Torque Characteristics

39. SVPWM APPLIED TO THE 2-LEG INVERTER UNDER DC-LINK VOLTAGE RIPPLE CONDITIONS The phase-to zero voltages under balanced load conditions

40. phase-to-neutral voltages VAN, VBN andVCN The phase-to-neutral output voltages can be transformed into space vector

41. Phase-to-zero and phase-to-neutral output voltages Voltage vectors in αβ plane

42. Unbalanced dc-link voltages The Time Durations In sector 1: 0≤ α≤π

43. (a) Timing of gate pulse of space vector PWM (b) Timing of gate pulse of carrier–based PWM In sector 2: π≤α≤2π V t is the instantaneous carrier signal .

44. Simulation Circuit of proposed method

45. Reference signals V refb and V refc

46. Line voltages

47. Speed & Torque Characteristics

48. FFT analysis

49. Comparison of Different PWM techniques for FSTPIs Sine PWM SV PWM Scalar PWM Carrier PWM Calculation Burden Low Very High Medium Low THD 20.08% 1.86% 14.79% 4.07% Output Voltage Normal Normal Maximum Normal DC-link voltage ripple Resolved Switching loss high low low high

51. BIBLIOGRAPHY Journals [1]. “Adaptive Carrier-based PWM for a Three-Phase Inverter under DC-link Voltage Ripple Conditions” Tuyen D. Nguyen*, Hong-Hee Lee† and Hoang M. Nguyen* Journal of Electrical Engineering & Technology Vol. 5, No. 2, pp. 290~298, 2010 [2]. Jae Hyeong Seo; Chang Ho Choi; Dong Seok Hyun, “A New Simplified space-Vector PWM Method for Three-Level Inverters”, IEEE Transactions on Power Electronics, Volume 16, Issue 4, Jul 2010, Pages 545 - 550 [3]. “the adaptive space vector pwm for four switch three phase inverter fed induction motor with dc – link voltage imbalance” by Hong Hee Lee*, Phan Quoc Dzung**, Le Dinh Khoa**, Le Minh Phuong**, Huynh Tan Thanh***School of Electrical Engineering, University of Ulsan Ulsan, Korea. [4]. Hind Djeghloud and Hocine Benalla, “Space Vector Pulse Width Modulation Applied to The Three-Level Voltage Inverter”, 5th International Conference on Technology and Automation ICTA’05, Thessaloniki, Greece, Oct 2010. Books [5]. P.S.Bimbhra, “Power Electronics”, Khanna publications. [6]. Muhammad H.Rashid “Power Electronics Circuits, devices, and Applications”, Prentice-Hall of India Private Limited, Third Edition, 2004. Thesis References [7]. Jin-woo Jung, “Space Vector PWM Inverter”, The Ohio State University, February, 2008. Website references [8]. www.ieeexplore.com

52. THANK YOU