Modular Directed Series Multilevel Converter for HVDC Applications

Patro, Siba Kumar; Shukla, Anshuman

doi:10.1109/tia.2020.2964639

Cited by 28 publications

(11 citation statements)

References 29 publications

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“…Each cell is simplified and described by two-state switching function that possesses 1 or 0 states as shown in (11) and (12). The synthesis of arm voltages V arm reflects the cell capacitor voltage imbalance and dynamics as described in (15). Therefore, it is highly efficient for large HVdc networks where observation of celllevel transient phenomena is required.…”

Section: B Emmc Modelling and Analysismentioning

confidence: 99%

“…trade-offs between control range, semiconductor losses and resiliency to dc faults [11]- [13]. The second group of hybrid converters mixes the basic building blocks of MMC such as the HB and FB chain-links or whole MMC power circuits with so called director switches (which are formed by series connected thyristors or IGBT) [14], [15]. Although the latter group compromises system modularity compared to the former, they offer a range of advantages, from nearly doubling the power extraction compared to that of the MMC, to bipolar dc voltage operation with semiconductor losses similar to that of the HB-MMC [16]- [19].…”

Section: Introduction Present Generations Of Multilevel Voltage Somentioning

confidence: 99%

“…to(15), the full switching function model of the EMMC is developed, in which the switching functions correspond to the gating signals of the switch S xi in each HB cell of the HVCLs, and to gating signals of the switches S 1 k and S 3 k in each FB cells of the LVCLs. Considering upper and lower arms of phase a as examples, the voltage of the HVCL of the arbitrary arm in (13) can be expressed as:…”

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confidence: 99%

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Enhanced Modular Multilevel Converter for HVdc Applications: Assessments of Dynamic and Transient Responses to AC and DC Faults

Vozikis

Adam

Rault³

et al. 2021

IEEE J. Emerg. Sel. Topics Power Electron.

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This paper describes the operating principles and theoretical relationships that underpin the modelling and control system of the enhanced modular multilevel converter (EMMC). A full-scale model of a point-to-point HVdc link that employs EMMCs is used to examine its performance during normal operation in all four quadrants, and resiliency to symmetrical and asymmetrical ac and dc faults. Results of exhaustive simulation studies reveal that the improved ac and dc power qualities, which are achieved by incorporation of a few full-bridge cells into the arms of conventional half-bridge modular multilevel converter (HB-MMC) with medium-voltage cells to create the EMMC do not affect its ac and dc fault ride-through capability nor its dynamics during normal operation as active and reactive power set-points being varied. In addition, a variant of the EMMC is proposed, in which the number of full-bridge cells to be added into the arms of HB-MMC could be increased to offer bespoke features beyond that explicitly defined in original vision of the EMMC, such as reduced dc voltage operation during pole-toground dc fault, and potential extension of fault clearance times in multi-terminal HVdc grids. Moreover, the validity of the new variant has been confirmed using results obtained from highfidelity HVdc link models developed in EMPT-RV platform, in which the EMMCs are replaced by the proposed variant.

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Section: B Emmc Modelling and Analysismentioning

confidence: 99%

Section: Introduction Present Generations Of Multilevel Voltage Somentioning

confidence: 99%

mentioning

confidence: 99%

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Enhanced Modular Multilevel Converter for HVdc Applications: Assessments of Dynamic and Transient Responses to AC and DC Faults

Vozikis

Adam

Rault³

et al. 2021

IEEE J. Emerg. Sel. Topics Power Electron.

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“…This engrossed many researchers to focus on its technical challenges associated for reliable operation and extend it to various low power applications. In addition to this, its modular and voltage scalable features, have become a growing attention in industrial applications compared to traditional converter [1][2][3][4]. The MMC was first proposed in 2003 [5] for wide power range applications, which are further extended to medium power applications such as variable speed drives, static compensator [6][7] etc.…”

Section: Introductionmentioning

confidence: 99%

Enhanced Voltage Sorting Algorithm for Balancing the Capacitor Voltage in Modular Multilevel Converter

Ismail

Kaliyaperumal²

2021

IEEE Access

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In this paper, an enhanced voltage sorting algorithm is proposed for balancing each sub module capacitor voltage in modular multilevel converter (MMC). However, the submodule (SM) voltage strategy becomes more complex when it increases to a number of levels, which eventually increases voltage ripples and circulating current. In order to overcome this problem, an enhanced voltage sorting algorithm is proposed, which implies an enhanced control logic function for capacitor voltage balancing of the converter. The switching pattern of each SM floating capacitor is determined based on the modulating signal methodology, which is then compared with the hybrid state condition using arm current direction in the MMC. Additionally, the generated hybrid signals are once again compared with the dynamic implicit number by conjoining the switching logic state variables. Due to this comparison of logic function, the capacitor voltage is balanced properly and reduces the capacitor ripple voltage to a permissible limit compared to the conventional method. Hence, compared to other balancing techniques, the circulating current is reduced by using conventional control techniques. The desired pulse signals for the power devices are obtained based on the multi carrier pulse width modulation techniques. The superior performance of the proposed algorithm is tested using MATLAB/Simulink software and real time laboratory hardware setup for different load conditions. Apart from this, the effective performance of the proposed method has been validated in the HVDC transmission system.

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“…In a system, there are several required voltage levels for different applications [30][31][32]. The complex topology, such as buck-boost topology and modular multilevel topology, could provide the power supply for the different output voltage requirements.…”

Section: Introductionmentioning

confidence: 99%

Modeling and Analysis of N-Branch Hybrid Switched Inductor and Capacitor Converter

Yang

et al. 2021

Electronics

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This paper proposes a family of N-Branch hybrid switched inductor and capacitor (SLC) converters. With the single circuit, the multi-level output voltage or current could be generated. The proposed converter is suitable both for the voltage source and the current source. The same LC network is reused for different LC branches. The proposed converter is controlled by the phase shift control method with a time domain multiplexing concept. The N level circuit is operated with the same frequency. One cycle period is divided into N small time cycles for each branch. The phase shift for each branch is . The load voltage could be changed by modifying the duty cycle of the transistor. When the SLCs work in the resonant condition, the soft switching will be acquired. The power loss of transistors could be sharply reduced. In this paper, a 300 W SLC converter is constructed to verify the theoretical analysis and operation mechanism in the resonant condition and hard switching condition. With the experimental and simulated verification, the soft switching and the stable multi-level output voltage or current are achieved. The proposed SLC converter could be used for the multi-level voltage power supply system, such as the electric vehicle, the electric aircraft, autonomous underwater vehicles (AUVs) and a new energy generation system.

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Modular Directed Series Multilevel Converter for HVDC Applications

Cited by 28 publications

References 29 publications

Enhanced Modular Multilevel Converter for HVdc Applications: Assessments of Dynamic and Transient Responses to AC and DC Faults

Enhanced Modular Multilevel Converter for HVdc Applications: Assessments of Dynamic and Transient Responses to AC and DC Faults

Enhanced Voltage Sorting Algorithm for Balancing the Capacitor Voltage in Modular Multilevel Converter

Modeling and Analysis of N-Branch Hybrid Switched Inductor and Capacitor Converter

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