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Analysis of the reason of cascade H-bridge inverter topology using carrier phase shift modulation method can- not 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 ef- fectively reduce the modulation delay, improve the control bandwidth, it can also make the harmonic compensation capac- ity increase from 5 times to 21. The scope of the application of STATCOM is greatly increased in the grid.

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