Investigations on Three Phase Five Level Cascaded type ... - IOSRJEN

IOSR Journal of EngineeringMay. 2012, Vol. 2(5) pp: 1056-1063and its FFT plot is shown in Fig.10. From Fig.10 it isobserved that the APOD strategy produces significant35 th and 37 th harmonic energy. Fig.11 shows the fivelevel output voltage generated by POD strategy andits FFT plot is shown in Fig.12. From Fig.12 it isobserved that the POD produces significant 33 rd and35 th harmonic energy. Fig.13 shows the five leveloutput voltage generated by PD strategy and its FFTplot is shown in Fig.14. From Fig.14 it is observedthat the PD strategy produces significant 30 th , 32 nd ,36 th and 38 th harmonic energy. Fig.15 shows the fivelevel output voltage generated by CO strategy and itsFFT plot is shown in Fig.16. From Fig.16 it isobserved that the CO strategy produces significant 3 rdand 38 th harmonic energy.Fig.17 shows the five level output voltage generatedby VF strategy and its FFT plot is shown in Fig.18.From Fig.18 it is observed that the VF strategyproduces significant 34 th and 38 th harmonic energy.Fig.19 shows the five level output voltage generatedby PS strategy and its FFT plot is shown in Fig.20.From Fig.20 it is observed that the PS strategy doesnot produce significant harmonic energy. Thefollowing parameter values are used for simulation:V DC =440V, f c = 2KHz and R (load) = 100 ohms.Fig.11 Output voltage generated by PODPWMstrategyFig.12 FFT plot for output voltage of PODPWMstrategyFig.9 Output voltage generated by APODPWMstrategyFig.13 Output voltage generated by PDPWM strategyFig.10 FFT plot for output voltage of APODPWMstrategyFig.14 FFT plot for output voltage of PDPWMstrategyISSN: 2250-3021 www.iosrjen.org 1060 | P a g e