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A novel MMC control scheme to increase the DC voltage in HVDC transmission systems

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Figure

Fig. 2.  Reference voltages to generate the fundamental voltage amplitude½VDC0: (a) comparison between sinusoidal modulation and third harmonic
Fig. 4.  Comparison of phase energy variation between conventional control and higher DC voltage operation, for m0=0.8, VDC0=1200 kV, P=1650
Fig. 5.  Control strategy of MMC with the proposed higher DC voltage operation.
Fig. 6.  Point-to-point HVDC link with half-bridge SM based MMCs where N=24.
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