An improved selective harmonics elimination technique for PV assisted single phase grid-tied PWM inverter

Purpose The purpose of this study is to present a new methodology of selective harmonics elimination (SHE) technique suitable for single-phase photovoltaic (PV) tied pulse width modulated (PWM) inverter. Design/methodology/approach In the proposed SHE, switching angles for inverter control are deter...

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Bibliographic Details
Published in:Compel 2020-05, Vol.39 (2), p.379-394
Main Authors: Santra, Subhendu Bikash, Mohanty, Subodh Kumar
Format: Article
Language:English
Subjects:
Electric potential
Electric power
Harmonics
Inverters
Methodology
Microcontrollers
Microprocessors
Modulation
Photovoltaic cells
Pulse duration modulation
Switching
Symmetry
Voltage
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Summary:Purpose The purpose of this study is to present a new methodology of selective harmonics elimination (SHE) technique suitable for single-phase photovoltaic (PV) tied pulse width modulated (PWM) inverter. Design/methodology/approach In the proposed SHE, switching angles for inverter control are determined offline through numerical techniques and stored in a microcontroller memory as a function of modulation index (md). The methodology uses the solution that leads to a lower change of switching angles from the previous modulation index (md) for storing in the processor memory for multiple solutions. This leads to a smaller number of sections when a piecewise mixed model is considered for storing the entire switching angle curve for the online inverter control. The proposed idea is simulated and experimentally validated on a laboratory prototype of PV (500 W) grid-tied PWM inverter. The control environment is then realized in NI c-RIO 9082. Findings This proposed technique is suitable for limiting voltage total harmonics distortion (THD) in single-phase PV tied grid connected voltage source inverter (VSI). Moreover, it is found that filter (L-C) size requirement is less. Originality/value The proposed SHE with piecewise mixed model technique effectively reduces voltage THD with less filter size (L-C) in a single-phase PV-tied system.
ISSN:0332-1649
2054-5606
DOI:10.1108/COMPEL-04-2019-0133