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This study proposed a novel protective action for converter side phase-to-ground fault of FB-MMC-based bipolar HVDC. The faulty converter is kept in operation during fault, and its dc-link voltage reference is set to zero in order to avoid serious overvoltage of the sub-module capacitors. This protective action was verified by simulation. The overcurrent and overvoltage of converter arms are moderate...
Conventional Electromagnetic Transient (EMT) simulations of a Modular Multilevel Converter based HVDC (MMC-HVDC) is quite time consuming. Therefore, the sub modules are often modeled with equivalent transformation methods. In this paper, two equivalent models with much higher efficiency have been presented for a specific MMC topology, i.e. the diode clamped half bridge topology, which convenient the...
An experimental prototype of a Voltage Source Converter (VSC) HVDC system for large wind farm integration was built. The aim of this prototype is to physically simulate the steady-state and dynamic behavior of the VSC-HVDC system for wind farm integration. Both terminals of the VSC-HVDC employ modular multilevel converter and an asynchronous motor and asynchronous generator system was used to physically...
Modular Multilevel Converter (MMC) has been accepted as the most competitive alternative for Voltage Source Converter (VSC) HVDC application. It is a very important issue to evaluate the converter losses and efficiency for a VSC-HVDC installation. A method is proposed to calculate the losses of a MMC using a digital calculation way. The switching waveforms are simulated in the digital calculation...
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