An Improved Phase-Shifted Carrier PWM for Modular Multilevel Converters with Redundancy Sub-Modules

Choi, Jong-Deok; Han, Byung-Moon

doi:10.6113/jpe.2016.16.2.473

Cited by 8 publications

(3 citation statements)

References 8 publications

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“…The power flow will finally be zero when the individual capacitor voltage regulation control achieved. Comparing (19) with the linear consensus algorithm defined in (4), we find that these two equations have a similar form. To gain a deeper understanding, here, as in consensus theory, we define a simple graph C, where the SMs are the vertices and the communications among SMs are the edges.…”

Section: Relationship Between Consensus Theory and MMC Control Amentioning

confidence: 86%

Interpreting the Individual Capacitor Voltage Regulation Control of PSC-PWM MMC via Consensus Theory

Song

Liu

2019

IEEE Access

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In computer science, consensus theory has been studied for decades. ''Consensus'' in a multiagent system means reaching an agreement regarding a certain quantity of interest. The modular multilevel converter (MMC) is a promising topology for medium-and high-power applications owing to its salient features. In MMC operation, one key point is to regulate the capacitor voltage of each submodule (SM). The SMs in MMCs are interconnected both physically and via a control system, and these SMs can be regarded as a multi-agent system, with the control objective of regulating their capacitor voltages, which could formulate a consensus problem. In this paper, through mathematical derivation, it is found that individual capacitor voltage regulation control of phase-shifted-carrier pulse-width modulation (PSC-PWM) MMC is one special case of consensus theory. Furthermore, based on the consensus theory, the influence of different communication structures on the MMC voltage regulation performance is discussed. The analysis proves that the existing one has the highest rate of convergence. The impact of current-tracking dynamics on consensus-based interpretation is also analyzed. In addition, the proportional relationship between the rate of convergence and the P controller parameter is also justified. The experiments on a seven-level down-scaled prototype are conducted to confirm the analysis.

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Section: Relationship Between Consensus Theory and MMC Control Amentioning

confidence: 86%

Interpreting the Individual Capacitor Voltage Regulation Control of PSC-PWM MMC via Consensus Theory

Song

Liu

2019

IEEE Access

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“…Literature [31,32] proposed a control strategy based on zero-order voltage injection. Under the condition of constant line voltage, the system phase voltage is reconstructed to enhance the fault-through capability.…”

Section: Introductionmentioning

confidence: 99%

Research on Unbalance Fault-Tolerant Control Strategy of Modular Multilevel Photovoltaic Grid-Connected Inverter

Liu

Jin

et al. 2018

Energies

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Abstract:The average switching model of modular multilevel converter (MMC) is built in this paper when the hot reserved strategy is adopted as a fault-tolerant control. When the MMC SM faults, the rest of the SMs cannot support the DC-link voltage, which results in interruption of the inverter. To tackle this issue, a novel fault-tolerant control strategy is proposed to bypass the SM under fault and re-regulate the SM capacitor voltage and carrier phase-shift angle to maintain the main components of circulating current, and reduce the Total Harmonic Distortion (THD) of grid connected current to enable the stable operation of the photovoltaic inverter. The maximum power tracking control is improved to solve the problem of long restoration time when faults occur, based on a constant voltage startup method combined with a fix-step incremental conductance method. Simulations in MATLAB/Simulink and experimental results have verified the feasibility and effectiveness of the proposed control strategy.

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“…These advantages make these multilevel converters very popular and efficient solutions to medium/high-voltage and high-power applications [2]- [9]. They have been widely employed in high-power drives [2], [3], high-voltage direct-current (HVDC) transmissions [4], [5], active power filters (APF) [6], static synchronous compensators (STATCOM) [7] and other industrial applications [8], [9] in the past decades.…”

Section: Introductionmentioning

confidence: 99%

A Hierarchical Model Predictive Voltage Control for NPC/H-Bridge Converters with a Reduced Computational Burden

Gong

Dai

et al. 2017

Journal of Power Electronics

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In recent years, voltage source multilevel converters are very popular in medium/high-voltage industrial applications, among which the NPC/H-Bridge converter is a popular solution to the medium/high-voltage drive systems. The conventional finite control set model predictive control (FCS-MPC) strategy is not practical for multilevel converters due to their substantial calculation requirements, especially under high number of voltage levels. To solve this problem, a hierarchical model predictive voltage control (HMPVC) strategy with referring to the implementation of g-h coordinate space vector modulation (SVM) is proposed. By the hierarchical structure of different cost functions, load currents can be controlled well and common mode voltage can be maintained at low values. The proposed strategy could be easily expanded to the systems with high number of voltage levels while the amount of required calculation is significantly reduced and the advantages of the conventional FCS-MPC strategy are reserved. In addition, a HMPVC-based field oriented control scheme is applied to a drive system with the NPC/H-Bridge converter. Both steady-state and transient performances are evaluated by simulations and experiments with a down-scaled NPC/H-Bridge converter prototype under various conditions, which validate the proposed HMPVC strategy.

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An Improved Phase-Shifted Carrier PWM for Modular Multilevel Converters with Redundancy Sub-Modules

Cited by 8 publications

References 8 publications

Interpreting the Individual Capacitor Voltage Regulation Control of PSC-PWM MMC via Consensus Theory

Interpreting the Individual Capacitor Voltage Regulation Control of PSC-PWM MMC via Consensus Theory

Research on Unbalance Fault-Tolerant Control Strategy of Modular Multilevel Photovoltaic Grid-Connected Inverter

A Hierarchical Model Predictive Voltage Control for NPC/H-Bridge Converters with a Reduced Computational Burden

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