A variable step-size MPPT for sensorless current model predictive control for photovoltaic systems

2016 ◽  
Author(s):  
Morcos Metry ◽  
Mohammad B. Shadmand ◽  
Robert S. Balog ◽  
Haitham Abu Rub
Keyword(s):  
Model Predictive Control ◽  
Predictive Control ◽  
Current Model ◽  
Variable Step Size ◽  
Photovoltaic Systems ◽  
Step Size ◽  
Variable Step

scholarly journals An Active Equalization Method for Lithium-ion Batteries Based on Flyback Transformer and Variable Step Size Generalized Predictive Control

Energies ◽  
2021 ◽  
Vol 14 (1) ◽  
pp. 207
Author(s):  
Jianwen Cao ◽  
Bizhong Xia ◽  
Jie Zhou
Keyword(s):  
Energy Consumption ◽  
Lithium Ion Batteries ◽  
Predictive Control ◽  
Lithium Ion ◽  
Generalized Predictive Control ◽  
Variable Step Size ◽  
Size Factor ◽  
Step Size ◽  
Variable Step ◽  
Equalization Method

The inconsistency in large-scale battery pack significantly degrades the performance of electric vehicles. In order to diminish the inconsistency, the study designs an active equalization method comprising of equalizer and equalization strategy for lithium-ion batteries. A bidirectional flyback transformer equalizer (BFTE) is designed and analyzed. The BFTE is controlled by a pulse width modulation (PWM) controller to output designated balancing currents. Under the purpose of shortening equalization time and reducing energy consumption during the equalization process, this paper proposes an equalization strategy based on variable step size generalized predictive control (VSSGPC). The VSSGPC is improved on the generalized predictive control (GPC) by introducing the Step Size Factor. The VSSGPC surmounts the local limitation of GPC by expanding the control and output horizons to the global equalization process without increasing computation owing to the Step Size Factor. The experiment results in static operating condition indicate that the equalization time and energy consumption are reduced by 8.3% and 16.5%, respectively. Further validation in CC-CV and EUDC operating conditions verifies the performance of the equalizer and rationality of the VSSGPC strategy.

Implementation of an Improved Incremental Conductance MPPT Control Based Boost Converter in Photovoltaic Applications

2017 ◽  
Vol 18 (4) ◽  
Author(s):  
Salah Necaibia ◽  
Mounia Samira Kelaiaia ◽  
Hocine Labar ◽  
Ammar Necaibia
Keyword(s):  
Low Cost ◽  
Boost Converter ◽  
Variable Step Size ◽  
Photovoltaic Systems ◽  
Tracking Accuracy ◽  
Step Size ◽  
Incremental Conductance ◽  
Variable Step ◽  
Conductance Technique ◽  
Power Point

Abstract The Photovoltaic systems have a slow dynamics of convergence toward the maximum power point (MPP), especially those equipped by the Boost converter based on the Conventional Incremental Conductance technique. This paper presents the simulation and hardware implementation of auto-scaling variable step-size MPPT in low cost and low power consumption μ-controller (PIC16F877A). Design and simulation of the proposed system are presented using ISIS PROTEUS. The two MPPT techniques, conventional IncCond method and variable step-size method are simulated in the ISIS PROTUES environment. The simulation results show the high tracking accuracy and fast speed convergence of the proposed method. Indeed, the experimental results are closely similar to those of simulation and also prove the advantages of the proposed technique, such as its reliability and accuracy in tracking the MPP. The suggested MPPT system reduces the complexity in implementation and cost of the photovoltaic systems.

A Variable Step-Size for Sparse Nonlinear Adaptive Filters

2021 ◽  
Author(s):  
Alberto Carini ◽  
Markus V. S. Lima ◽  
Hamed Yazdanpanah ◽  
Simone Orcioni ◽  
Stefania Cecchi
Keyword(s):  
Adaptive Filters ◽  
Variable Step Size ◽  
Step Size ◽  
Variable Step
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