A current controller for the modular multilevel converter operating under distorted grid voltage

2018 ◽  
Vol 28 (4) ◽  
pp. e2524 ◽  
Author(s):  
Glendy A. Catzin Contreras ◽  
Gerardo Escobar ◽  
Andres A. Valdez-Fernandez ◽  
Manuel J. Lopez-Sanchez
Keyword(s):  
Modular Multilevel Converter ◽  
Multilevel Converter ◽  
Grid Voltage ◽  
Current Controller ◽  
Distorted Grid ◽  
A Current

scholarly journals A Simple Operation Approach for Modular Multilevel Converter Under Grid Voltage Swell in Medium-Voltage Microgrids

IEEE Access ◽  
2019 ◽  
Vol 7 ◽  
pp. 147280-147291
Author(s):  
Qian Xiao ◽  
Yu Jin ◽  
Linglin Chen ◽  
Xiaodan Yu ◽  
Hongjie Jia ◽  
...  
Keyword(s):  
Modular Multilevel Converter ◽  
Multilevel Converter ◽  
Grid Voltage ◽  
Medium Voltage ◽  
Simple Operation ◽  
Voltage Swell

scholarly journals Integration of Photovoltaic Power Units to Power Distribution System through Modular Multilevel Converter

Energies ◽  
2018 ◽  
Vol 11 (10) ◽  
pp. 2753 ◽  
Author(s):  
Seyed Hakimi ◽  
Amin Hajizadeh
Keyword(s):  
Power Distribution ◽  
Distribution System ◽  
Distribution Systems ◽  
Sliding Mode ◽  
Dynamic Performance ◽  
Lyapunov Theory ◽  
Modular Multilevel Converter ◽  
Multilevel Converter ◽  
Power Distribution System ◽  
Grid Voltage

With the growing of using photovoltaic (PV) units in power distribution systems, the role of high-performance power electronic converters is increasing. In this paper, modelling and control of Modular Multilevel Converter (MMC) are addressed for grid integration of PV units. Designing a proper controller for MMC is crucial during faulty conditions to make the converter stable and provide proper dynamic performance. To achieve this goal, a dynamic model of MMC is presented which it includes symmetrical components of voltage and current. Then, adaptive robust current controllers are developed based on sliding mode and fuzzy controllers for MMC and then the robustness and stability of the controllers are proved by the Lyapunov theory. To implement the proposed controllers under unbalanced grid voltage fault, positive and negative sequences current controllers are implemented to compensate the effect of grid voltage fault and load power variation. Finally, numerical results are shown to evaluate the performance of MMC. In the end, the experimental results are given to prove the controller performance. The outcome indicates that the proposed current controllers are more effective under voltage disturbance conditions and could satisfy the stability of MMC.

ANFIS Controller Design of DFIG under Distorted Grid Voltage Situations

2019 ◽  
Vol 12 (5) ◽  
pp. 445-452
Author(s):  
Hossein Komijani
Keyword(s):  
Controller Design ◽  
Control Strategies ◽  
Grid Voltage ◽  
Pi Regulator ◽  
Component Decomposition ◽  
Current Controller ◽  
Distorted Grid ◽  
Seventh Order ◽  
Harmonic Components ◽  
Doubly Fed

Background: Modeling and controlling of Doubly Fed Induction Generator (DFIG) are presented in this paper. The DFIG is considered in the positive synchronous reference framework under Distorted Grid Voltage Situations (DGVS). The DFIG electromagnetic torque, active and reactive powers of the instantaneous stator are discussed under the condition of harmonically DGVS. Methods: Four alternative control strategies are implemented on DFIG system to enhance the responses under DGVS. A novel rotor current controller based on adaptive neuro-fuzzy interface system (ANFIS) is developed. The main, fifth and seventh order harmonic components of rotor current are straightly adjusted by ANFIS controller without using any sequential component decomposition techniques at six times the grid frequency. The simulation results of implementing the presented control strategies on a two megawatt wind turbine driven DFIG system validate the feasibility and the robustness of the control scheme. Results: The results are compared with the compound controller consisting of a proportional integral (PI) regulator and a harmonic resonant (R) compensator. Conclusion: This comparison indicates the notable removal of torque and DFIG power oscillations either under DGVS.

scholarly journals Modified natural frame control of single‐phase cascaded H‐bridge multilevel converter under distorted grid voltage

2021 ◽  
Author(s):  
Daliang Yang ◽  
Shuang Chen ◽  
Xuan Zhang ◽  
Linhang Yang ◽  
Jinbao Liu ◽  
...  
Keyword(s):  
Single Phase ◽  
Multilevel Converter ◽  
Grid Voltage ◽  
Distorted Grid ◽  
Natural Frame
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