Mechanism and Cancellation of DC Current Fluctuation in MMC Excited by Circulating Current Mitigation Under Nearest Level Control

Ma, Ke; Li, Enyi; He, Bo; Cai, Xu

doi:10.1109/jestpe.2022.3160836

Cited by 2 publications

(1 citation statement)

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“…The literature suggests various pulse width modulation (PWM) techniques for controlling MMC, such as sinusoidal pulse width modulation (SPWM), space vector PWM, selective harmonic elimination (SHE), and nearest level modulation (NLM) [5]. NLM is preferred among all PWM techniques due to its salient features, such as operating at the fundamental switching frequency (reducing switching losses) and being easy to implement for a higher number of SMs [6], [7]. Furthermore, it offers attractive advantages, such as a natural voltage balancing algorithm and not involving complicated mathematical calculations as in the case of SHE.…”

Section: Introductionmentioning

confidence: 99%

Hardware-in-the-loop setup for enhanced modular multi-level converter with reduced circulating currents

Soomro,

Ali,

Memon

2024

IJECE

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Owing to its essential features, such as modularity and exceptional power quality, the modular multilevel converter (MMC) emerges as the optimal converter topology for high-voltage direct current (HVDC) applications. Traditionally, MMCs are controlled through a method called nearest level modulation (NLM), which generates N+1 AC output voltages, where N represents the number of sub modules (SMs) per arm. In this paper, we introduce a modified NLM technique designed to yield 2N+1 and 4N+1 levels, with a focus on efficiently controlling internal dynamics. The proposed MMC is evaluated using a hardware-in-the-loop (HIL) environment to obtain real-time simulation outcomes. This MMC topology demonstrates a reduction in circulating currents and capacitor voltage ripple.

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Section: Introductionmentioning

confidence: 99%