The Open Electrical & Electronic Engineering Journal

2015, 9 : 216-224
Published online 2015 July 31. DOI: 10.2174/1874129001409010216
Publisher ID: TOEEJ-9-216

Carrier Level Layered Modulation Method can Filter Out the Harmonics of Cascaded H - Bridge Topology

Wang Huadong and Cai Xv
Department of Electronic Information and Electrical Engineering, Faculty of Electrical Engineering, Shanghai Jiao Tong University, P.O. Box: 200240, Shanghai, China.

ABSTRACT

Analysis of the reason of cascade H-bridge inverter topology using carrier phase shift modulation method cannot compensate the harmonic, using carrier level layered modulation method can solve the problem of cascade H-bridge topology that it cannot compensate harmonic problems. Experimental results show that the modulation algorithm can effectively reduce the modulation delay, improve the control bandwidth, it can also make the harmonic compensation capacity increase from 5 times to 21. The scope of the application of STATCOM is greatly increased in the grid.

Keywords:

Cascade H bridge, carrier level layered modulation, carrier phase-shifting modulation, harmonic compensation, PWM, STATCOM.