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The hybrid high voltage direct current (Hybrid HVDC) system based on line commutated converter (LCC) and modular multilevel converter (MMC) is a feasible solution for long distance bulk power transmission. In order to handle the dc-side short-circuit fault, two kinds of methods can be adopted. The first one is to replace half-bridge sub-modules (HBSMs) with full-bridge SMs or clamp-double SMs which...
In modular multilevel converters (MMC), a circulating current in each phase unit is caused by the DC voltage ripples of the phase unit. This paper analyzed the power transfer of MMC, the energy and voltage fluctuations of the storage capacitors in the sub-modules. An accurate model to determine the voltage ripples of a phase unit is derived, in consideration of the asynchronous fluctuations of the...
Using classical transmission line steady-state model and based on the three-pulse harmonic voltages of the rectifier side and the inverter side, this paper describes an approach to calculate the DC side harmonic currents in HVDC systems, including the harmonic currents flowing directly in the DC line and the grounding electrode line, as well as the harmonic currents induced in their lightning shield...
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