A Study on Current Ripple Reduction Due to Offset Error in SRF-PLL for Single-phase Grid-connected Inverters

2014 ◽  
Vol 28 (11) ◽  
pp. 68-76
Author(s):  
Seon-Hwan Hwang ◽  
Young-Gi Hwang ◽  
Soon-Kurl Kwon
Keyword(s):  
Single Phase ◽  
Ripple Reduction ◽  
Current Ripple ◽  
Offset Error

scholarly journals Novel ripple reduction method using three-level inverters with unipolar PWM

2021 ◽  
Vol 22 (3) ◽  
pp. 1272
Author(s):  
Paiboon Kiatsookkanatorn ◽  
Napat Watjanatepin
Keyword(s):  
Single Phase ◽  
Pulse Width Modulation ◽  
Current Harmonics ◽  
Switching Patterns ◽  
Unipolar Pulse ◽  
Three Phase ◽  
Ripple Reduction ◽  
Novel Method ◽  
Dipolar Modulation ◽  
Current Ripple

This paper proposes a novel method to reduce voltage and current ripple for the inverters by using three-level inverters with unipolar pulse width modulation (PWM) (3LFB-2U). A simple technique of switching signal generation by using carrier-based dipolar modulation of three-phase three-level inverters is extended to single-phase inverters that can be done by generating all possible switching patterns of the single-phase three-level inverters. Moreover, the concept of carrier-based dipolar modulation and the construction of reference voltages from desired output voltage and added zero voltage to control unipolar switching is also shown. The research results reveal that the proposed method can reduce the voltage and current ripple. Furthermore, the voltage and current harmonics can reduce by 27.80% and 1.79%, respectively less than two-level inverters without a loss of a simple modulation to generate the switching signals.

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