Control of Circulating Currents in Modular Multilevel Converters Through Redundant Voltage Levels

Konstantinou, Georgios; Pou, Josep; Ceballos, Salvador; Picas, Ricard; Zaragoza, Jordi; Agelidis, Vassilios G.

doi:10.1109/tpel.2015.2512842

Cited by 63 publications

(17 citation statements)

References 29 publications

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“…The 2N + 1 output voltage level can be generated by varying the total number of inserted SMs in the upper and lower arms by N − 1, N, and N + 1 [25]. Notably, the N−1 and N + 1 choices generate the identical output voltage level [25,26]. It is apparent that certain correspondences exist between the number of inserted SMs and the output voltage level, which is described as = − + + 1 In the conventional indirect MPC method, the range of evaluation processes in the MPC strategy includes all possible inserted SMs for the single-phase seven-level MMC (N = 3) used in this experiment.…”

Section: Reduction Of Calculation Burdenmentioning

confidence: 99%

Improved Indirect Model Predictive Control for Enhancing Dynamic Performance of Modular Multilevel Converter

Nguyen

Kwak

2020

Electronics

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Model predictive control has become a tremendously popular control method for power converters, notably a modular multilevel converter, owing to the ability to control various objectives at once with a particular cost function and prominent dynamic performance. However, the high number of submodules in cascaded control means that the model predictive control for the modular multilevel converter suffers from a computational burden. Several approaches focused on reducing the computational burden based on limiting the number of possible switching states (possible choices) to be evaluated at each sampling instant. The dynamic performance of the modular multilevel converter is degraded in a transient state, despite the reduced computational burden. This paper presents an improved indirect model predictive control method to reduce the computational burden and enhance the dynamic performance. The proposed approach considers the steady-state and transient state individually and applies a different range of choices for each specific case. The range of choices during the steady-state is limited in order to reduce the computational burden without deteriorating the output quality, whereas the number of choices will be increased during the transient state to guarantee dynamic performance. The results that were obtained by implementing an experiment on a laboratory setup of a single-phase modular multilevel converter are presented in order to verify the proposed approach’s effectiveness. From the experimental setup, the computational time in the proposed approach was reduced by about 75% when compared with the conventional indirect model predictive control, whereas keeping fast dynamic performance.

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Section: Reduction Of Calculation Burdenmentioning

confidence: 99%

Improved Indirect Model Predictive Control for Enhancing Dynamic Performance of Modular Multilevel Converter

Nguyen

Kwak

2020

Electronics

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“…Thus, mitigation of these harmonics is needed. These harmonics can be regulated by active compensation of voltage imbalance in a phase leg through control methods [38][39][40][41][42][43][44] or can be attenuated by tuned arm filters [45,46].…”

Section: Control Systemmentioning

confidence: 99%

Modeling of MMC for Fast and Accurate Simulation of Electromagnetic Transients: A Review

Khan

Tedeschi

2017

Energies

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Over the past decade, modular multilevel converters have evolved as the preferred choice for high voltage conversion systems. The design of the converter poses a computational challenge to the classical electromagnetic transient simulation techniques, for which the existing literature proposes numerous simplified and computationally-efficient equivalent representations. Despite the extensive collection of proposed models, the literature lacks a systematic comparison of these representations, which could enable their appropriate selection based on the specific simulation objectives. In light of these requirements, this article presents a comprehensive review of MMC models and discusses their applicability for parallel and real-time simulation. Using PSCAD/EMTDC simulations, the models are objectively compared with regards to computational efficiency and accuracy for various transient conditions. In addition, the paper also presents a brief account of MMC operation and the associated control and modulation system.

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“…These controllers are usually designed to cope with a limited order of harmonics as the controller complexity grows with accuracy. To reduce complexity, [11] proposes a circulating current control through redundant voltage levels of the converter. Defining the number of selected sub-modules (SMs) in the modulation process, this procedure eliminates additional control loops and improves converter dynamics especially at large numbers of SMs.…”

Section: Introductionmentioning

confidence: 99%

Circulating Current Elimination of Grid-Connected Modular Multilevel Converters

Shahnazian

Adabi

Pouresmaeil

et al. 2018

2018 IEEE International Conference on Environment and Electrical Engineering and 2018 IEEE Industrial and Commercial Power Syst

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This paper presents an analytical dynamic model of a modular multilevel converter (MMC) in grid-connected operating mode. The proposed model is then efficiently used to design a circulating current controller. The proposed controller can accurately study the dynamic and steady-state performance of the converter through harmonic evaluations. Based on this configuration, the modulation is accomplished so that the stable performance of the converter in the network is obtained, which is considered as the foremost novelty of the proposed control method over existing control methods. In order to mitigate the circulating currents, the proposed controller inserts an estimated second harmonic component into modulation indices, which is considered as the second novelty of the proposed control method. The functionality and capability of the proposed control method are validated using detailed theoretical analysis and simulations with MATLAB/Simulink.

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Control of Circulating Currents in Modular Multilevel Converters Through Redundant Voltage Levels

Cited by 63 publications

References 29 publications

Improved Indirect Model Predictive Control for Enhancing Dynamic Performance of Modular Multilevel Converter

Improved Indirect Model Predictive Control for Enhancing Dynamic Performance of Modular Multilevel Converter

Modeling of MMC for Fast and Accurate Simulation of Electromagnetic Transients: A Review

Circulating Current Elimination of Grid-Connected Modular Multilevel Converters

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