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Multi-Objective Genetic Algorithm Based Coordinated Second- and Third-Order Harmonic Voltage Injection in Modular Multilevel Converter
2020
IEEE Access
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INDEX TERMS Modular multilevel converter, third-order harmonic voltage injection, circulating current control, multi-objective optimization, genetic algorithm. ...
The second-order circulating current control and third-order harmonic voltage injection are two conventional optimization methods, but the existing research neglects their coupling effects. ...
The method in this paper can analyze more objective functions of influencing factors to further optimize the costs and losses of MMC. This method adopts the offline optimization mode. ...
doi:10.1109/access.2020.2995293
fatcat:iuuc3nylhzf5loryo2pglun2my
Reducing Submodule Capacitance for Modular Multilevel Converter-Based Medium-Voltage Wind Power Converter
2022
Frontiers in Energy Research
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Using this method, the SM capacitor voltage ripple can be significantly reduced by injecting the second harmonic component of circulating current. ...
The design of the SM capacitor of the modular multilevel converter (MMC) should consider the actual operating conditions, especially the influence of wind speed, because wind speed will affect the voltage ...
(2) The second harmonic component of circulating current injection will affect the voltage ripple of the submodule capacitor, and at different wind speeds, the amplitude of each injected circulating current ...
doi:10.3389/fenrg.2022.883004
doaj:c69c6e3e6212437eb3ced56432da9147
fatcat:2olyk4v6lngeja7cgesfcntzw4
Influence of third harmonic injection on modular multilevel converter -based high-voltage direct current transmission systems
2016
IET Generation, Transmission & Distribution
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This paper evaluates the influence of third harmonic injection on system power losses, submodule capacitance, circulating current, and fault current and mathematical models are derived. ...
Index Terms-DC fault current, HVDC transmission, modular multilevel converter (MMC), power loss, submodule capacitance, third harmonic injection. ...
In [9] , second harmonic is injected into arm currents to optimize the current distribution among the SMs and reduce SM capacitor voltage ripple, but at the expense of higher semiconductor current stresses ...
doi:10.1049/iet-gtd.2015.1470
fatcat:qpbrb5mrbnd4rlrcb2icgac75y
Study of the MMC circulating current for optimal operation mode in HVDC applications
2015
2015 17th European Conference on Power Electronics and Applications (EPE'15 ECCE-Europe)
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the second harmonic circulating current i 2 injection. ...
In Fig. 4 the ripple improvements, obtained with the injection of optimal 2 nd and 4 th harmonics and with only optimal 2 nd harmonic, are shown. ...
doi:10.1109/epe.2015.7311781
fatcat:6su2esqpvfh6zhcjbfezqnbiae
Optimal Management for Megawatt Level Electric Vehicle Charging Stations with a Grid Interface Based on Modular Multilevel Converter
2021
IEEE Access
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of an MMC-based EVCSs. ...
The PFM algorithm controls the circulating currents to compensate the phase-to-phase, arm-to-arm and intra-arm unbalances of the given loading, which is determined by the LM strategy. ...
To this end, we performed RT-simulations for two cases: i) without injection of the second harmonic circulating current and ii) with second harmonic current calculated by using the look-up tables. ...
doi:10.1109/access.2021.3137544
fatcat:b7jv7wre5nbe5inc4wy4new22q
Adaptive loss&capacitance-reduction control strategy based on second-harmonic circulating current injection for MMC
2019
IET Power Electronics
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By existing methods of second-harmonic circulating current injection with a closed-loop control strategy, the SM capacitance value can be greatly reduced. ...
This study gives the design of the SM capacitance value when the second-harmonic circulating current is injected with a closed-loop control strategy. ...
Acknowledgments This work was supported by the National Natural Science Foundation of China, grant no. 61673210.
References ...
doi:10.1049/iet-pel.2018.6051
fatcat:e7qfwwszkjbrpi2puqa2e3cx3m
Design Procedure of MMC-HVDC System: Comprehensive Consideration of Internal and External Dynamics
2020
IEEE Access
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circulating current reduction, maximum allowable modulation index for MMC operating condition, which considered only a single purpose. ...
Previous studies on MMC parameter selection separately deal with each specific component such as energy storage capacity for voltage ripple of sub-module (SM) capacitor, arm inductance for second harmonic ...
The second harmonic circulating current is injected into the arm current thereby the arm current is distorted as depicted in (h) of Fig. 5 . ...
doi:10.1109/access.2020.3018597
fatcat:76dxz64rejhrln62adh2ciqjoq
Optimal Management for Megawatt Level Electric Vehicle Charging Stations With a Grid Interface Based on Modular Multilevel Converter
2021
IEEE access 10
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The PFM algorithm controls the circulating currents to compensate the phase-to-phase, arm-to-arm and intra-arm unbalances of the given loading. ...
The performance of the proposed optimization-based LM is compared with a rule-based benchmark LM by simulating the daily operation of an example shopping mall parking with MMC-based grid interface. ...
Joint Call on Efficient Energy Storage and Distribution. ...
doi:10.18154/rwth-2021-12090
fatcat:sexcbzl7ezbvtnmfolsz7zkygi
Overview on submodule topologies, modeling, modulation, control schemes, fault diagnosis, and tolerant control strategies of modular multilevel converters
2020
Chinese Journal of Electrical Engineering
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Several studies have focused on different aspects of MMCs, including submodule topologies, modeling schemes, modulation strategies, control schemes for voltage balancing and circulating currents, fault ...
In the final section, the current research status of MMCs and their future trends are emphasized. ...
The advantage of this optimized SVM strategy is that the optimal capacitor voltage and circulating current control of MMCs can be easily achieved. ...
doi:10.23919/cjee.2020.000001
fatcat:fbgcofrhhbfn7fwq3xan5poi7u
A Review of Modular Multilevel Converters for Stationary Applications
2020
Applied Sciences
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The main purpose of this review is to present the current state of the art of the MMC technology and to offer a better understanding of its operation and control for stationary applications. ...
The challenges linked to the MMC are associated with submodule balancing control, circulating current control, control complexity, and transient performance. ...
The authors also acknowledge Flanders Make for the support of this research study.
Conflicts of Interest: The authors declare no conflict of interest. ...
doi:10.3390/app10217719
fatcat:v7cmjpzg6nfpzoqaz7oze7us4y
Thermal Optimization Strategy Based on Second-Order Harmonic Circulating Current Injection for MMCs
2021
IEEE Access
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current into the circulating current of MMCs, and accordingly the lifetime of MMCs can be improved by the proposed strategy. ...
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 ...
harmonic circulating current injection related to I2m and θ is considered. ...
doi:10.1109/access.2021.3084998
fatcat:z2mmkknqpvesrjeqzktprja5ye
Common-Mode Insertion Indices Compensation With Capacitor Voltages Feedforward to Suppress Circulating Current of MMCs
2020
CPSS Transactions on Power Electronics and Applications
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In order to improve the efficiency of modular multilevel converters (MMCs) and reduce the capacitor voltage ripples, the circulating current between the phase-legs should be suppressed. ...
This approach not only facilitates the analysis of circulating current mechanism with a deep insight, but also provides a simple approach to achieve a wide bandwidth circulating current suppression without ...
Another problem with this method is that other frequency harmonic currents are not suppressed, which becomes more serious when optimized control methods are adopted. ...
doi:10.24295/cpsstpea.2020.00009
fatcat:jpv6aktw5bcardrkphu36l26gm
Virtual Impedance Sliding Mode Control Based MMC Circulating Current Suppressing Strategy
2019
IEEE Access
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In order to enhance suppressing the second order harmonic component of circulating current and improve the dynamic response of the system, a novel circulating current suppressing strategy based on virtual ...
Different circulating current suppressing strategies are compared by simulation, the results demonstrate the correctness of the VI-SMC-CCS, which not only effectively reduces the second order harmonic ...
Table 4 show that the performance of VI-SMC-CCS model is optimal in terms of the second order harmonic ratio and DC component sacrifices of the circulating current.
C. ...
doi:10.1109/access.2019.2900471
fatcat:ltdso6chojhw5ik7ke6pw6tx2a
Benchmarking of Modular Multilevel Converter Topologies for ES-STATCOM Realization
2020
Energies
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Moreover, the possibility of using over-modulation in MMC using bridge cells has an important role in the optimization of ES-STATCOM. ...
Modular multilevel converter (MMC) topologies constitute a promising converter family for ES-STATCOM realization, providing a modular and scalable solution with a high efficiency that handles high-power ...
The arm inductance L attenuates the harmonics in the converter circulating current. The SOC balancing is performed by a circulating current control [29] . ...
doi:10.3390/en13133384
fatcat:rczmqbs2crdb7dmezrw23fmxge
Novel DC Capacitor Voltage Balancing Strategy of Modular Multilevel Converter based STATCOM for Reactive Power Compensation and Voltage Improvement
2023
International Journal on Recent and Innovation Trends in Computing and Communication
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However, one critical concern in MMC-Statcom operation is the voltage balancing of DC capacitors, which directly affects system performance and efficiency. ...
In this research, a novel DC capacitor voltage balancing strategy is proposed for MMC-Statcom to ensure optimal operation and enhanced performance. ...
This injected current effectively compensates for the harmonic components, contributing to the overall mitigation of harmonic distortions in the system. ...
doi:10.17762/ijritcc.v11i10.10078
fatcat:ukkxuvk7mncotmrwwbvlpwf5wa
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