Power Quality Improvement in HVDC MMC With Modified Nearest Level Control in Real-Time HIL Based Setup

Ali, Saddaqat; Soomro, Jahangeer Badar; Mughal, Mahnoor; Chachar, Faheem Akhtar; Bukhari, Syed Sabir Hussain; Ro, Jong‐Suk

doi:10.1109/access.2020.3043811

Cited by 19 publications

(11 citation statements)

References 29 publications

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“…e proposed hybrid topology utilises both HB cells of medium-voltage and FB cells of low voltage. e conventional MMC generates N+1 levels for N submodules per arm, whereas recently modified NLM control has been proposed for HBMMC to achieve 2N + 1 levels [69][70][71][72]. e modified NLM control method has been further extended in an article to achieve 4N + 1 levels for HBMMC [71].…”

Section: Developments Of MMC Circuit Topologiesmentioning

confidence: 99%

“…e conventional MMC generates N+1 levels for N submodules per arm, whereas recently modified NLM control has been proposed for HBMMC to achieve 2N + 1 levels [69][70][71][72]. e modified NLM control method has been further extended in an article to achieve 4N + 1 levels for HBMMC [71]. Modified NLM may be further investigated and applied to FBMMC and other cell arrangements to generate 4N + 1 levels.…”

Section: Developments Of MMC Circuit Topologiesmentioning

confidence: 99%

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A Detailed Review of MMC Circuit Topologies and Modelling Issues

Soomro

Akhtar

Hussain

et al. 2022

International Transactions on Electrical Energy Systems

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MMC is a promising technology for MTDC systems and would transform into the concept of Supergrids in the near future. The salient features of MMC are modularity, reduced dv/dt and di/dt stress on switches, voltage and power scalability, inherent fault blocking capacity, transformerless operation, and improved power quality. However, there are some technical issues and challenges to be critically analysed and addressed. There is room for development of novel and enhanced MMC based on SM configurations to enable higher efficiency, improved power quality, compactness, and DC fault blocking capacity. Moreover, development of efficient and accurate models is required for the studies of MTDC grids during steady-state and transient conditions. Literature review suggests a need for studying and comparing different MMC modelling approaches because no modelling technique can be best suited for all applications. The main contribution of this paper is to provide a comprehensive review of recent developments in MMC in terms of SM configurations. This paper also presents an in-depth review of systematic comparison of different models of MMC, which can enable appropriate selection of model based on target studies and desired accuracy and efficiency. Finally, the associated research challenges and future trends are presented.

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Section: Developments Of MMC Circuit Topologiesmentioning

confidence: 99%

Section: Developments Of MMC Circuit Topologiesmentioning

confidence: 99%

A Detailed Review of MMC Circuit Topologies and Modelling Issues

Soomro

Akhtar

Hussain

et al. 2022

International Transactions on Electrical Energy Systems

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“…These features make the converter an attractive alternative for medium voltage drives [1], [2]. The MMC is also utilised in HVDC transmission systems [3], and power quality improvements [4]. The number of voltage levels or sub-modules (SMs) in an MMC arm varies according to the application.…”

Section: Introductionmentioning

confidence: 99%

Real-Time Emulation of a PMSM-Loaded MMC With BESS

et al. 2023

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This paper details a validated real-time emulation of a modular multilevel converter with integrated energy storage sub-modules. The real-time emulated system is implemented using MicroLabBox/ dSPACE. A validation is carried out by constructing and testing a prototype of the converter with a reduced number of voltage levels and integrated batteries. The real-time operation of the emulated converter is tested under a range of loading conditions and compared to the prototype. Emulated results closely match the physical prototype results. Based on this outcome, a converter that comprises a high number of sub-modules is emulated and investigated when connected to a large scale motor. This research provided a seamless extension of the model from a lower to a higher number of converter sub-modules with minor changes in the emulation structure, the basic control and the sorting algorithm. This is a novel real-time emulation of the converter that can be used for electric vehicle application using MicroLabBox/dSPACE.

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“…The conventional NLM method generates N+1 AC output levels (N is the number of SMs in the upper/lower arm) [14]. More SMs are employed to raise the number of levels in the output, which increases the number of switches, capacitors, and gate driver circuitry and, therefore, the system's complexity [15], [16]. To increase the number of levels, the power quality of the output voltage and current Modified NLM methods are presented in various research articles.…”

Section: Introductionmentioning

confidence: 99%

“…To increase the number of levels, the power quality of the output voltage and current Modified NLM methods are presented in various research articles. For instance, the authors in [15] proposed modified NLM for Half Bridge (HB) MMC to produce 4N+1 level output AC waveform. However, HB MMC cannot block dc fault currents in case of dc short circuit fault.…”

Section: Introductionmentioning

confidence: 99%

Modified Nearest Level Modulation for Full-Bridge Based HVDC MMC in Real-Time Hardware-in-Loop Setup

et al. 2021

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Modular Multilevel Converter (MMC) is an emerging converter topology for medium and high voltage applications. Nearest level Modulation (NLM) is the conventional control topology used to control the MMC that produces the N+1 AC output waveform. In previous research work, the Modified NLM has been already proposed, producing a 2N+1 and 4N+1 output waveform while utilizing a half-bridge (HB) submodule (SM) topology. However, half-bridge-based MMC has a similar behavior as two-level Voltage Source Converter (VSC) and cannot block DC fault current in case of DC-side short circuit fault. So, in recent years, full-bridge-based MMC topology is preferably used by manufacturers as it has DC fault blocking capabilities. This paper presents the Modified NLM for Full bridge (FB) SM topology to take the critical benefits of FB SM topology and improve power quality. The proposed method is simpler to implement and produces a 4N+1 AC output waveform. The THD of the output voltage and current reduces to half compared to the conventional NLM method. The proposed method is verified using LabVIEW Multisim co-simulation and as well as real-time simulation.INDEX TERMS Modified NLC, full bridge, HVDC MMC, hardware-in-loop simulation.

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Power Quality Improvement in HVDC MMC With Modified Nearest Level Control in Real-Time HIL Based Setup

Cited by 19 publications

References 29 publications

A Detailed Review of MMC Circuit Topologies and Modelling Issues

A Detailed Review of MMC Circuit Topologies and Modelling Issues

Real-Time Emulation of a PMSM-Loaded MMC With BESS

Modified Nearest Level Modulation for Full-Bridge Based HVDC MMC in Real-Time Hardware-in-Loop Setup

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