Neutral-Point-Shift-Based Active Thermal Control for a Modular Multilevel Converter Under a Single-Phase-to-Ground Fault

Dong, Yufei; Yang, Heya; Li, Wuhua; He, Xiangning

doi:10.1109/tie.2018.2833019

Cited by 29 publications

(10 citation statements)

References 33 publications

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“…Recently, some circulating current control methods [23][24][25][26][27] are presented to optimize the SM power loss of MMCs. However, they ignore that thermal performance of semiconductor device is the significant evaluation criterion for reliability and lifetime of MMCs [5,7]. This paper proposes a thermal optimization control (TOC) for MMCs, as illustrated in Fig.…”

Section: Proposed Thermal Optimization Controlmentioning

confidence: 99%

“…At the given P and Q, the grid current amplitude Im and grid power factor angle φ can be obtained based on (3), And accordingly, the grid current ia can be obtained based on (2). The DC link current idc can be obtained based on (5). In Fig.…”

Section: Proposed Thermal Optimization Controlmentioning

confidence: 99%

“…The MMC consists of a large number of submodules (SMs), and each SM includes several semiconductor devices (e.g. IGBT and diode) [4]- [5]. The lifetime among these semiconductor devices in each SM are normally different by reason of their different thermal stress.…”

Section: Introductionmentioning

confidence: 99%

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Thermal Optimization Strategy Based on Second-Order Harmonic Circulating Current Injection for MMCs

Zhao

Deng

et al. 2021

IEEE Access

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Thermal management is one of the most significant challenges for reliability improvement of modular multilevel converters (MMCs). The thermal stress difference caused by the uneven loss distribution between top and bottom IGBTs/diodes will lead to lifetime difference of the IGBTs/diodes which will decrease the reliability of the MMC. In this paper, a thermal optimization strategy for MMCs is proposed, where the maximum thermal stress in the IGBT/diode of each SM can be effectively reduced through injecting optimum second-order harmonic current into the circulating current of MMCs, and accordingly the lifetime of MMCs can be improved by the proposed strategy. Detailed simulation results with PSCAD software and experimental results with 3kW MMC platform are provided to confirm the validity of the proposed thermal optimization strategy for MMCs. INDEX TERMSCirculating current injection, Modular multilevel converters, lifetime, thermal optimization.

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Section: Proposed Thermal Optimization Controlmentioning

confidence: 99%

Section: Proposed Thermal Optimization Controlmentioning

confidence: 99%

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Thermal Optimization Strategy Based on Second-Order Harmonic Circulating Current Injection for MMCs

Zhao

Deng

et al. 2021

IEEE Access

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“…Without addressing grid code requirements, a reduction in positive sequence real current with the reduction of grid voltage was adopted to limit the converter current in [25]. During an unbalanced fault, thermal control of MMC was discussed; however, the converter peak current limit was not addressed in [26]. The uncertainty in the submodule capacitance and arm inductance was addressed using optimal guaranteed cost control theory while leaving current limiter and grid code requirements in [27].…”

Section: Introductionmentioning

confidence: 99%

Positive-Negative Sequence Current Controller for LVRT Improvement of Wind Farms Integrated MMC-HVDC Network

Hossain

Abido

2020

IEEE Access

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Positive and negative sequence based current control strategy is developed for the modular multilevel converter (MMC), which complies with the grid code requirements during the balanced and unbalanced faults at the point of common coupling of AC grids. This research proposes an efficient and simplified current limiting technique to keep the inverter individual phase current at a predefined threshold during faults. In this work, the current controller of the MMC converter is designed based on stationary reference frame while positive sequence synchronous reference frame is used to design the current limiter. The proposed work considers the complete dynamics of permanent magnet synchronous generator (PMSG) and doubly fed induction generator (DFIG) based wind energy. The MMC aggregate model is developed and simulated in Matlab/Simulink. The MMC model is also developed using real-time digital simulation (RTDS). A comparative performance analysis between the proposed and the conventional current limiter is provided where the proposed sequence-based current controller with the current limiter shows promising performance under severe disturbances. Besides grid compliance, the results with the proposed control scheme demonstrate the improvement of low voltage ride-through capability without any violation of converter current and HVDC link voltage limits.

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“…Other advantages that have contributed to MMCs' growing popularity include voltage scalability, lower total harmonic distortion (THD), higher quality of output voltage and current waveforms, fault tolerance, and redundancy [13,14]. Reducing the power losses in semiconductor switches and the sizes of filters are the other useful features of MMCs [15,16]. With regard to the impacts of the increased number of devices, assembling complexity, heat dissipation of losses, and total cost of the multilevel converters and MMCs, the tendency nowadays is to develop multilevel converter topologies with reduced numbers of power devices while generating more voltage levels.…”

Section: Introductionmentioning

confidence: 99%

ZPUC: A New Configuration of Single DC Source for Modular Multilevel Converter Applications

Arazm

Al‐Haddad

2020

IEEE Open J. Ind. Electron. Soc.

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Z packed U-cell (ZPUC) converter topology is presented in this paper as a new type of multilevel converter topology that can be operated in a single phase as well as in three-phase configurations while using a single DC source. Since each U-cell includes two switches and one capacitor, in this topology, three U-cells are needed to generate 5 or 7 voltage levels. Moreover, the configuration proposed for the ZPUC is more appropriate for high-power application modular multilevel converters (MMCs) to increase the voltage levels compared to other topologies. Accurate voltage balancing on small-sized auxiliary capacitors is due to integrated modulation strategy without using additional controllers; additionally, the reduction of total harmonic distortion (THD) in AC currents for higher voltage levels is an advantage of this configuration. A full topology sequence of operation and performance analysis of ZPUC based on the 5-L inverter is investigated in Matlab-Simulink and experimentally validated on a 3 kVA prototype. The obtained results illustrate the good dynamic performance of the proposed topology and the implemented integrated switching pattern voltage balancing. INDEX TERMS ZPUC topology, modular multilevel converter (MMC), ZPUC-MMC active voltage balancing, power quality, reliability.

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Neutral-Point-Shift-Based Active Thermal Control for a Modular Multilevel Converter Under a Single-Phase-to-Ground Fault

Cited by 29 publications

References 33 publications

Thermal Optimization Strategy Based on Second-Order Harmonic Circulating Current Injection for MMCs

Thermal Optimization Strategy Based on Second-Order Harmonic Circulating Current Injection for MMCs

Positive-Negative Sequence Current Controller for LVRT Improvement of Wind Farms Integrated MMC-HVDC Network

ZPUC: A New Configuration of Single DC Source for Modular Multilevel Converter Applications

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