Abstract
Modular multilevel converter (MMC) usually consists of many submodules (SMs). During the commutation transient, the voltage to ground of SM jumps, and high <tex xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">$\mathrm{d}v/\mathrm{d}t$</tex> causes common-mode (CM) current to flow into the ground through parasitic capacitors, resulting in severe conducted EMI. In this paper, the rules of voltage to ground of SMs at different positions are derived under Nearest Level Modulation (NLM) and Carrier Phase-Shift Pulse Width Modulation (CPS-PWM) and further analyze the voltage jump rules. The EMI sources under two different modulation strategies are analyzed by comparing the equivalent number of voltage jump in a fundamental period. Finally, the simulation results illustrate the validity of the analysis.
Sign-in/Register to access full text options 
Free) 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a call
