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The series HVDC tap based on modular multilevel converter (MMC) has been proposed to provide power supply for rural places. However, most of current capacitor voltage balancing control strategies are not suitable for series MMC tap. In this paper, the principle of power transfer between phases, arms and sub-modules (SMs) in a series MMC are analyzed. A hierarchical capacitor voltage balancing control...
In recent years, significant progress has been made in HVDC transmission by the advent of voltage-source-converter (VSC) technology using modular multilevel converters. There is increasing demand to interconnect the existing HVDC lines into meshed HVDC grids for better renewable energy penetration. In this paper, a series of power electronic topologies, all based on the front-to-front VSC structure,...
The isolated modular DC-DC converter (IMDCC) is a new topology designed to connect high-voltage direct current (HVDC) lines with different voltage levels, which ties two DC grids by using two modular multilevel converters (MMCs) via a medium-frequency transformer. Due to the large value of capacitance in the IMDCC, proper precharge strategies before the start-up are significant for the safety and...
The concept of HVDC taps drawing small amount of power from HVDC lines to the rural places has been considered for several decades. Most of the earlier tap converters were limited by its loss, cost, reliability, and control difficulties. However, in this paper, the emerging modular multilevel converter (MMC) is adopted as the series HVDC tap, which reveals significantly improved performance and feasibility...
Redundant submodules (SMs) are always required to ensure the reliability of the modular multilevel converter (MMC). In this letter, a new control method for MMC is proposed to seamlessly ride through the period when bypassing a faulty SM and inserting a redundant SM. With the proposed method, the redundant SMs can be arranged in cold reserve mode so as to reduce the conduction losses, and when faced...
This paper presents the design and control methods for a modular multilevel converter (MMC) based back-to-back (BTB) system. A 20kW, 50Hz three phase downscaled prototype is constructed to show the working principles, hardware design procedures, and control circuits implementation. In this prototype, there are two MMC stations, namely the inverter and the rectifier, each consisting of 18 full-bridge...
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