scholarly journals Digital control strategy for SPWM MPPT of PV system with three-phase NPC three-level converter

2020 ◽  
Vol 19 (2) ◽  
pp. 572
Author(s):  
Mahmoud Aref ◽  
Ismaiel Ahmed ◽  
Vladislav Oboskalov
Keyword(s):  
Digital Control ◽  
Output Voltage ◽  
Maximum Power ◽  
Pv System ◽  
Lcl Filter ◽  
Phase Inverter ◽  
Three Phase ◽  
Multi Level ◽  
Level Converter ◽  
Three Phase Inverter

<p><span>This paper is aimed at investigating MPPT of PV system controlled by SPWM which is generated by comparing sinusoidal wave with variable frequency sawtooth wave. Perturb and Observe (P&amp;O) method is used for MPPT control of PV system. NPC three-phase three-level converter with LCL filter is designed to produce output voltage with minimum Total Harmonic Distortion (THD) and high efficiency. The simple and fast method to get MPP of PV system with variable irradiation is digital control where the maximum power point is obtained from look-up table for the values of optimum voltage that achieve the maximum power for each irradiance value is used for digital control signal in microcontroller. The output voltage harmonic of multi-level three-phase inverter is controlled using SPWM control. THD of output voltage of multi-level three-phase inverter is 22% of stand-alone and grid-connected PV system. Small rate LCL filter is used to limit voltage harmonics within medium and low voltage limits (5%). THD output voltage of LCL filter is 4.9% and 3.51% of stand-alone and grid-connected PV system respectively. </span></p>

scholarly journals Design and Simulation of an Isolated Seven Level Three Phase Inverter

2021 ◽  
Vol 9 (8) ◽  
pp. 1458-1462
Author(s):  
Debadyuti Banerjee
Keyword(s):  
Output Voltage ◽  
Pulse Width Modulation ◽  
Reference Signal ◽  
Signal Frequency ◽  
Isolation System ◽  
Phase Inverter ◽  
Three Phase ◽  
Control Scheme ◽  
Multi Level ◽  
Three Phase Inverter

Abstract: This paper proposes a seven level three phase inverter with PWM control scheme for better performance and magnitude control of output voltage. This proposed inverter offers a proper isolation between load and inverter circuit and different phases also. This inverter is capable of generating waveforms independently for different phases. By changing the reference signal frequency output frequency can be changed which is capable to make the system of variable frequency. Use of reverse voltage topology has increased the magnitude of output voltage. Proper application of diode makes the unidirectional switch bidirectional and decreases the number of switches. Keywords: Pulse width modulation, multi-level topology, bi-directional switches, isolation system

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