Abstract
The modular multilevel converter (MMC) has been widely used for high-voltage direct current (HVDC) transmission due to lots of advantage. However, traditional topology of MMC doesn’t have the DC fault ride-through (FRT) capability. Over the past few years, many improved MMC topologies with DC FRT capability are presented, but few of them can continuously operate during DC faults to regulate and control the active power of connected AC grids. This paper proposes a novel hybrid modular multilevel converter (HMMC) with integrated battery energy storage. The batteries’ voltage is low, with only 10% energy storage of wind farm’s rated capacity, which can produce the same virtual inertia as a same capacity synchronous generator. Under DC-side fault condition, proposed HMMC can control the active power of connected AC grids. The control strategy of battery current, voltage balancing and parameter design are discussed in the paper. Simulation results validate the theoretical analysis of the proposed topology.
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