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 ne
Abstract Nearest level modulation (NLM) is the most commonly used modulation method for modular multilevel converter (MMC). When the number of levels is small, the output voltage and current harmonics of the NLM are severely distorted, and it cannot be used in MMC based medium-voltage motor ...
For MMC using conventional nearest level control (NLC) with dozens of submodules per arm, CCSC will introduce fluctuations in the DC current/power delivered by MMC. This paper comprehensively analyzes this mechanism of the DC current distortion, and a hybrid modulation method which combine the ...
nearest level modulationAn 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 double the level number of ac output volt...
This paper proposes a robust SM fault management scheme that enables uninterrupted operation of MMC with nearest level modulation under SM fault. The SM fault characteristics in different operation modes are presented. Then, the fault detection method based on measuring the compensation of the ...
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...
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 ...
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 ...
Harmonic analysis,Power system harmonics,Voltage control,Level control,Mathematical model,Pulse width modulation,Switching frequencyThis paper proposes a novel harmonic control method combining the improved nearest level control (NLC) and selective harmonic elimination (SHE) method. For the proposed improved...
Even though the MMC does have an attractive configuration with such a variety of notable features, a sophisticated control method is designed for desirable process. Pulse-width modulation (PWM) control strategy of various combinations, such as phase and level-shifted carriers, has been the most ...