The invention discloses a common-mode-injection-based nearest level modulation method for a modular multilevel converter (MMC). According to the method, a common-mode component is injected into a three-phase nearest level modulation wave and the phase voltage magnitude level is reduced based on ...
The offset (neutral-to-zero-point) voltage is adjusted so that the magnitude of each AC pole voltage maintains constant value with N + 1 level in the range of whole modulation index (MI). The validity of the proposed scheme was confirmed by computer simulations for the MMC with 22.9 kV/...
The proposed NLM method presents simple implementation as in the C-NLM, and it is implemented to the upper and lower arms of the MMC; then, arm voltages are successfully controlled. Furthermore, output voltage returns the value of zero in the C-NLM process for low-modul...
nearest level modulationAn enhanced level鈥恑ncreased nearest level modulation (eNLM) method is proposed to improve the performance of modular multilevel converter (MMC) with relatively small number of submodules. The eNLM method can almost double the level number of ac output voltage, compared ...
modular multilevel converternearest level modulation漏2018 John Wiley & Sons, Ltd. An enhanced level-increased nearest level modulation (eNLM) method is proposed to improve the performance of modular multilevel converter (MMC) with relatively small number of submodules. The eNLM method can almost ...
DC OFFSET COMPENSATION IN MODULAR MULTILEVEL CONVERTER In a method of compensating for a DC offset of a high-voltage AC output from a Modular Multilevel Converter (MMC) including at least one phase leg, the MMC is connected to a three-phase high-voltage AC grid via a grid transformer. The...
high voltage direct current (HVDC) system; modular multilevel converter (MMC); sub-module (SM); nearest level control (NLC); Offset voltage; modulation index (MI); total harmonic distortion (THD) 1. Introduction Recently, a high voltage direct current (HVDC) system with voltage source ...