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

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 study of a single phase grid connected pv inverter performance under a weak grid conditions and distorted grid voltage for Cambodia

2021 ◽  
Vol 12 (2) ◽  
pp. 1055
Author(s):  
Sovanna Phoeurn ◽  
Sakda Somkun
Keyword(s):  
Single Phase ◽  
Stability Control ◽  
System Control ◽  
Grid System ◽  
Grid Voltage ◽  
Power System Control ◽  
Power Meter ◽  
Weak Grid ◽  
Pv Inverter ◽  
Distorted Grid

<span lang="EN-US">A single-phase grid-connected PV inverter performance under a weak grid is a model designed to penetrate PV energy with a weak grid. Usually, this model gets complex and unstable in power system control such as THD growth, harmonic effects, voltage surges, inverter performance. Experimental results would present the impacts on the system which would lead to instability in the grid system. This study was based on inverter performance control, a weak grid control, the grid distortion examination, and harmonic effects. To optimize this grid system, hence, the proposed methods of oscilloscope and power meter were proportionally used to control the grid impacts and stabilities. The results showed that current THD in distorted grid voltage system surged to 8.88%. V<sub>PCC</sub> growth was 238.11V, equivalent to 8.23% in a weak grid (X<sub>L</sub> and R). Such a huge increase could prevent the grid system from transferring power for later operation. During the experiment, the inverter, S power and Q power performances stood for good operating processes without impacts on the grid performance. This method  should be applied with a weak grid system because it provided information about grid stability control.</span>

scholarly journals Time-Domain Simulations of Single-Phase Enhanced PLL for Power Converters under Distorted Grid Conditions

2019 ◽  
Vol 8 (2) ◽  
pp. 3053-3057
Keyword(s):  
Time Domain ◽  
Single Phase ◽  
Phase Error ◽  
Frequency Tracking ◽  
Grid Voltage ◽  
Grid Synchronization ◽  
Distorted Grid ◽  
Phase Variations ◽  
Voltage Frequency ◽  
Mathematical Equations

With the developing number of alternate energy sources being connected to the Grid, there is a need for robust Grid synchronization technique that is capable enough despite the grid frequency and phase variations. Single phase Enhanced Phase Locked Loop (EPLL) presented in this paper meets these requirements. A detailed study of the performance of EPLL for disturbances in input grid voltage magnitude, phase and frequency is detailed through mathematical equations. Extensive simulations are carried out in Matlab/Simulink to analyze the phase and frequency tracking by EPLL. Dynamic response is examined carefully in terms of estimation of grid voltage, frequency and phase error

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