IMPLEMENTATION OF NEW H- BRIDGE MULTILEVEL INVERTER USING A COMBINATION OF HIGH FREQUENCY AND LOW FREQUENCY MODULATION

Abstract

This paper proposes a seven level inverter with photovoltaic system, for stand-alone applications with hybrid PWM control scheme. Three carrier signals that are identical to each other which are compared with unidirectional sinusoidal reference signal were used to generate the PWM signals. In this paper, a new topology with a combination of low frequency and high frequency switches is proposed to improve the performance of a multilevel inverter. This topology requires fewer components compared to existing inverters and requires fewer carrier signals and gate drives. Therefore, the overall cost and complexity are greatly reduced. The performance of proposed multilevel inverter with equal dc sources is simulated by using MATLAB platform. Harmonic analysis is done on H-Bridge seven level inverter and experimental results are presented to demonstrate the superiority of the proposed system.

Keywords

• Equal dc sources, Fundamental frequency switching scheme, multilevel inverter, PWM, Total

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25. A.Maheswari was born in
26. Tamilnadu, India, on April
27. 7, 19 She received her
28. B.E degree in Electrical and
29. Electronics Engineering
30. from V.M.K.V Engineering
31. College, Salem, in 2004, the
32. M.E degree in Power Elec
33. tronics and Drives from Government College of
34. Engineering, Salem, in 2008. Currently she is pur
35. suing Ph.D. She has presented 7 papers in various
36. national and international conferences. She has
37. also published six papers in the international jour
38. nal. Her current research interests include simula
39. tion and control techniques of AC drives, inverter
40. topologies and harmonic suppression.
41. Dr. I. Gnanambal was born
42. in Tamilnadu, India. She re
43. ceived her B.E degree in
44. Electrical and Electronics
45. Engineering from Govern
46. ment College of Engineering,
47. Salem, in 1981, the M.E de
48. gree in Applied Electronics
49. in Government College of Technology, Coim
50. batore, in 2002 and Ph.D. degree in Networking
51. from Anna University, Chennai in 2008. She has
52. presented more than 60 papers in various national
53. and international conferences. She has also pub
54. lished more than fifteen papers in international
55. journals. Her research interests include power
56. electronics, solid state drives, networking and
57. special electrical machines.