scholarly journals Two-timescale simultaneous perturbation stochastic approximation using deterministic perturbation sequences

2003 ◽  
Vol 13 (2) ◽  
pp. 180-209 ◽  
Author(s):  
Shalabh Bhatnagar ◽  
Michael C. Fu ◽  
Steven I. Marcus ◽  
I-Jeng Wang
Keyword(s):  
Stochastic Approximation ◽  
Simultaneous Perturbation Stochastic Approximation

Maximum Power Point Tracking of Multi-String Photovoltaic Array via Simultaneous Perturbation Stochastic Approximation

2013 ◽  
Author(s):  
Yan Xiao ◽  
Yaoyu Li ◽  
John E. Seem ◽  
Kaushik Rajashekara
Keyword(s):  
Stochastic Approximation ◽  
Maximum Power Point Tracking ◽  
Maximum Power ◽  
Pv System ◽  
Maximum Power Point ◽  
Simultaneous Perturbation Stochastic Approximation ◽  
Pv Systems ◽  
Point Tracking ◽  
Power Point Tracking ◽  
Power Point

This paper presents a Maximum Power Point Tracking (MPPT) strategy for multi-string photovoltaic (PV) systems using the Simultaneous Perturbation Stochastic Approximation (SPSA) algorithm. The multi-string PV system considered is a decentralized control configuration, controlling the voltage reference to each PV module but based on the feedback of the total power at the DC bus. This requires only one pair of voltage and current measurements. The MPPT control problem for such topology of multi-string PV systems features a high input dimension, which can dramatically slow down the searching process for the real-time optimization process involved. The SPSA algorithm is considered in this study due to its remarkable capability of fast convergence for high dimensional search problems endorsed by various applications recently. Simulation study is performed for an 8-string PV system, and experimental study is performed for a 4-string PV system. Good performances are observed for both simulation and experimental results.

Using normalized simultaneous perturbation stochastic approximation for stable convergence in model-free control scheme

2018 ◽  
Author(s):  
Mohd Ashraf Ahmad ◽  
Nik Mohd Zaitul Akmal Mustapha ◽  
Ahmad Nor Kasruddin Nasir ◽  
Mohd Zaidi Mohd Tumari ◽  
Raja Mohd Taufika Raja Ismail ◽  
...  
Keyword(s):  
Stochastic Approximation ◽  
Stable Convergence ◽  
Simultaneous Perturbation Stochastic Approximation ◽  
Model Free ◽  
Control Scheme ◽  
Model Free Control
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