Input Current Balancing Control Method under Imbalanced Load for Three-phase Multi-port Converter based on Modular Multilevel Converter

2020 ◽  
Author(s):  
Takumi Yasuda ◽  
Mitsuru Miyashita ◽  
Takahiro Kumagai ◽  
Keisuke Kusaka ◽  
Jun-ichi Itoh ◽  
...  
Keyword(s):  
Control Method ◽  
Input Current ◽  
Modular Multilevel Converter ◽  
Multilevel Converter ◽  
Three Phase ◽  
Balancing Control

scholarly journals Modular Multilevel Converter for Photovoltaic Application with High Energy Yield under Uneven Irradiance

Energies ◽  
2020 ◽  
Vol 13 (10) ◽  
pp. 2619
Author(s):  
Anirudh Budnar Acharya ◽  
Dezso Sera ◽  
Remus Teodorescu ◽  
Lars Einar Norum
Keyword(s):  
Power Control ◽  
High Efficiency ◽  
Control Method ◽  
Harmonic Distortion ◽  
High Energy ◽  
Energy Yield ◽  
Modular Multilevel Converter ◽  
Multilevel Converter ◽  
Residual Voltage ◽  
Three Phase

The direct integration of Photovoltaic (PV) to the three-phase Modular Multilevel Converter (MMC) without dc–dc converters results in high-efficiency PV power plant with increased energy yield. The arm power control method for the MMC further improves the extraction of available power under uneven irradiance across different phases of the MMC. However, the uneven irradiance between the sub-modules results in residual voltage that results in harmonics and unbalance components. In this paper, the effect of uneven irradiance across the sub-module of the MMC is investigated with arm power control method. A modified balancing algorithm for the arm power control of the MMC is proposed which enables balanced power to be injected into ac grid despite uneven irradiance across the sub-modules in the MMC. The modified balancing algorithm enables to keep the unbalance in the phase currents below 10% and the Total Harmonic Distortion (THD) is confined as per IEEE 519 standard.

Control of a Three-Phase Four-Wire Modular Multilevel Converter as a Grid Emulator in Fault Scenarios

2021 ◽  
Author(s):  
Ming Jia ◽  
Shenghui Cui ◽  
Katharina Hetzenecker ◽  
Jingxin Hu ◽  
Rik W. De Doncker
Keyword(s):  
Modular Multilevel Converter ◽  
Multilevel Converter ◽  
Three Phase

scholarly journals A Fault-Tolerant Control Strategy of Modular Multilevel Converter with Sub-Module Faults Based on Neutral Point Compound Shift

Energies ◽  
2019 ◽  
Vol 12 (5) ◽  
pp. 876 ◽  
Author(s):  
Qinyue Zhu ◽  
Wei Dai ◽  
Lei Guan ◽  
Xitang Tan ◽  
Zhaoyang Li ◽  
...  
Keyword(s):  
Fault Tolerance ◽  
Control Strategy ◽  
Control Method ◽  
Fault Tolerant ◽  
Fault Tolerant Control ◽  
Neutral Point ◽  
Modular Multilevel Converter ◽  
Phase Voltage ◽  
Multilevel Converter ◽  
Shift Control

In view of the complex calculation and limited fault tolerance capability of existing neutral point shift control algorithms, this paper studies the fault-tolerant control method for sub-module faults in modular multilevel converters on the basis of neutral point compound shift control strategy. In order to reduce the calculation complexity of shift parameters in the traditional strategy and simplify its implementation, an improved AC side phase voltage vector reconstruction method is proposed, achieving online real-time calculation of the modulation wave adjustment parameters of each phase required for fault-tolerant control. Based on this, a neutral point DC side shift control method is proposed to further improve the fault tolerance capability of the modular multilevel converter (MMC) system by compensating the fault phase voltage with non-fault phase voltage. By means of the compound shift control strategy of the DC side and AC side of the neutral point, an optimal neutral point position is selected to ensure that the MMC system output line voltage is symmetrical and the amplitude is as large as possible after fault-tolerant control. Finally, the effectiveness and feasibility of the proposed control strategy are verified by simulation and low-power MMC experimental system testing.

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