The recent developments in power semiconductors and control methods have made the voltage source converter based high voltage direct current (VSC-HVDC) feasible [1]. Due to the application of voltage source converter (VSC) technology and pulse width modulation (PWM) the VSC-HVDC has a number of potential advantages as compared with CSC-HVDC(i.e., also referred to as classic HVDC), such as short circuit current reduction, independent control of active power and reactive power, etc. With those advantages VSC-HVDC will likely be widely used in future transmission and distribution systems. Modular multilevel PWM converter applies modular approach and phase-shifted concepts achieving a number of advantages and therefore is popularly used in HVDC power transmission. This paper describes the hardware design principle of submodule in modular multilevel converter(MMC).
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