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AC voltage control of DC/DC converters based on modular multilevel converters in multi-terminal high-voltage direct current transmission systems

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Figure

Figure 1.Figure 1. Radial three-terminal high-voltage direct current (HVDC) system using average models of half-bridge (HB)-based modular multilevel converters (MMCs), incorporating a front-to-front DC/DC converter based on MMCs
Figure 2.Figure 2. Proposed control strategy of the DC/DC converter: (a) AC voltage control; (b) power control
Figure 3. AC quantities of the DC/DC converter in the proposed standby operation in the event of a local DC fault at Figure 3
Figure 4. Other waveforms in the proposed standby operation of the DC/DC converter during a fault on Cable 3 at t0 = 0.7 s: (a) sum of the SM capacitor voltages per arm of MMC2; (b) the sum of the SM capacitor voltages per arm of MMCFigure 4
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