Improvements on the Incremental Conductance MPPT Method Applied to a PV String with Single-Phase to Three-Phase Converter for Rural Grid Applications

A power electronic interface that integrates a photovoltaic string with a single-phase grid to feed a three-phase induction motor, while driving a fan-type load, is presented. The interface is composed of a single-phase active rectifier and a three-phase inverter with output transformer, wherein t...

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Main Authors: MONTEIRO, L. F. C., FREITAS, C. M., BELLAR, M. D.
Format: Article
Language:English
Published: Stefan cel Mare University of Suceava 2019-02-01
Series:Advances in Electrical and Computer Engineering
Subjects:
Online Access:http://dx.doi.org/10.4316/AECE.2019.01009
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author MONTEIRO, L. F. C.
FREITAS, C. M.
BELLAR, M. D.
author_facet MONTEIRO, L. F. C.
FREITAS, C. M.
BELLAR, M. D.
author_sort MONTEIRO, L. F. C.
collection DOAJ
description A power electronic interface that integrates a photovoltaic string with a single-phase grid to feed a three-phase induction motor, while driving a fan-type load, is presented. The interface is composed of a single-phase active rectifier and a three-phase inverter with output transformer, wherein the Photovoltaic (PV) string is straightly connected to the DC-link, avoiding the use of additional converter for maximum power point tracking, commonly seen in previous works. However, in this system configuration, disturbances at the DC-link may occur due to increments and decrements of load active power, with consequent low-frequency oscillations at the AC grid side of the active rectifier. Therefore, a modified Incremental Conductance based algorithm is proposed, with which low-frequency oscillations around the maximum power point are minimized even under disturbances at the DC-link. Moreover, the overall system energy management, composed of control algorithms, that integrates maximum power point identification , DC-link voltage regulation, motor speed controller and power quality at the input AC mains, is also proposed. Simulation results are provided to evaluate the system effectiveness under AC mains with voltage sag occurrence, load transient and steady-state conditions at different solar irradiance levels.
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spelling doaj.art-8a94b286886e44eaa8b3c83e4aa697692022-12-21T19:10:48ZengStefan cel Mare University of SuceavaAdvances in Electrical and Computer Engineering1582-74451844-76002019-02-01191637010.4316/AECE.2019.01009Improvements on the Incremental Conductance MPPT Method Applied to a PV String with Single-Phase to Three-Phase Converter for Rural Grid ApplicationsMONTEIRO, L. F. C.FREITAS, C. M.BELLAR, M. D.A power electronic interface that integrates a photovoltaic string with a single-phase grid to feed a three-phase induction motor, while driving a fan-type load, is presented. The interface is composed of a single-phase active rectifier and a three-phase inverter with output transformer, wherein the Photovoltaic (PV) string is straightly connected to the DC-link, avoiding the use of additional converter for maximum power point tracking, commonly seen in previous works. However, in this system configuration, disturbances at the DC-link may occur due to increments and decrements of load active power, with consequent low-frequency oscillations at the AC grid side of the active rectifier. Therefore, a modified Incremental Conductance based algorithm is proposed, with which low-frequency oscillations around the maximum power point are minimized even under disturbances at the DC-link. Moreover, the overall system energy management, composed of control algorithms, that integrates maximum power point identification , DC-link voltage regulation, motor speed controller and power quality at the input AC mains, is also proposed. Simulation results are provided to evaluate the system effectiveness under AC mains with voltage sag occurrence, load transient and steady-state conditions at different solar irradiance levels.http://dx.doi.org/10.4316/AECE.2019.01009rural areasstatic power converterspower system dynamicssolar power generationiterative algorithms
spellingShingle MONTEIRO, L. F. C.
FREITAS, C. M.
BELLAR, M. D.
Improvements on the Incremental Conductance MPPT Method Applied to a PV String with Single-Phase to Three-Phase Converter for Rural Grid Applications
Advances in Electrical and Computer Engineering
rural areas
static power converters
power system dynamics
solar power generation
iterative algorithms
title Improvements on the Incremental Conductance MPPT Method Applied to a PV String with Single-Phase to Three-Phase Converter for Rural Grid Applications
title_full Improvements on the Incremental Conductance MPPT Method Applied to a PV String with Single-Phase to Three-Phase Converter for Rural Grid Applications
title_fullStr Improvements on the Incremental Conductance MPPT Method Applied to a PV String with Single-Phase to Three-Phase Converter for Rural Grid Applications
title_full_unstemmed Improvements on the Incremental Conductance MPPT Method Applied to a PV String with Single-Phase to Three-Phase Converter for Rural Grid Applications
title_short Improvements on the Incremental Conductance MPPT Method Applied to a PV String with Single-Phase to Three-Phase Converter for Rural Grid Applications
title_sort improvements on the incremental conductance mppt method applied to a pv string with single phase to three phase converter for rural grid applications
topic rural areas
static power converters
power system dynamics
solar power generation
iterative algorithms
url http://dx.doi.org/10.4316/AECE.2019.01009
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