Maximum power point tracking in solar panels under partial shading condition using equilibration algorithm

Partial shading (PS) is an unavoidable condition which significantly reduces the efficiency and stability of a photovoltaic (PV) system. With PS, the system usually exhibits multiple-peak output power characteristics, but single-peak is also possible under special PS conditions. In fact it is shown that the partial shading condition (PSC) is the necessary but not sufficient condition for multiple-peak. Based on circuit analysis, this paper shows that the number of peak points can be determined by short-circuit currents and maximum-power point currents of all the arrays in series. Then the principle is established based on which the number of the peak points is to be determined. Furthermore, based on the dynamic characteristic of solar array, this paper establishes the rule for determination of the relative position of the global maximum power point (GMPP). In order to track the GMPP within an appropriate period, a reliable technique and the corresponding computer algorithm are developed for GMPP tracking (GMPPT) control. It exploits a definable nonlinear relation has been found between variable environmental parameters and the output current of solar arrays at every maximum power point, obtained based on the dynamic performance corresponding to PSC. Finally, the proposed method is validated with MATLAB ® /Simulink ® simulations and actual experiments. It is shown that the GMPPT of a PV generation system is indeed realized efficiently in a realistic environment with partial shading conditions.

show abstract

“…Equation (31) defines the relationship between S, V and I. It is easily to prove, strictly, that the…”

Section: Relationship Between S and Operating Parametersmentioning

confidence: 99%

Analysis of Dynamic Characteristic for Solar Arrays in Series and Global Maximum Power Point Tracking Based on Optimal Initial Value Incremental Conductance Strategy under Partially Shaded Conditions

Zhao

Zhou

et al. 2017

Energies

View full text Add to dashboard Cite

show abstract

Proposal for an Active PV Array to Improve System Efficiency During Partial Shading

Itako

Kudoh

et al. 2021

IEEE Access

View full text Add to dashboard Cite

Owing to time-varying external environmental influences, undesirable string mismatches frequently occur in photovoltaic (PV) power generation systems, which will cause conventional PV systems to experience extremely severe power losses. Under partial shading conditions (PSCs) caused by passing clouds, neighboring buildings, and animal excrement, the characteristic curve of the PV string becomes complicated with multiple peaks, which increases the difficulty of determining the maximum power point (MPP) of the array. However, it is essential to ascertain the global maximum power point (GMPP) to extract the full power of each PV module. Therefore, we propose a new type of PV generation module constituting an active PV array (APV) system as well as its control strategy. It can ensure that the system continuously operates in the optimal state when the solar irradiation intensity drops drastically due to unanticipated environmental variables. Depending on the experiment of two PV arrays under identical conditions, the efficiency and reliability of the APV system are substantiated. Meanwhile, in the case where the external environmental conditions are deliberately changed, the experimental results fully illustrate the adaptability of the APV system to diverse harsh conditions.INDEX TERMS Active PV array, global maximum power point tracking, PV string, partial shading conditions, real-time scanning method.

show abstract

Photovoltaic Maximum Power Point Tracker for a Multiple-Input SEPIC Under Partial Shading Condition

Ajabnoor

Kwasinski

2022

2022 IEEE 13th International Symposium on Power Electronics for Distributed Generation Systems (PEDG)

View full text Add to dashboard Cite

Maximum power point tracking in solar panels under partial shading condition using equilibration algorithm

Cited by 3 publications

References 8 publications

Analysis of Dynamic Characteristic for Solar Arrays in Series and Global Maximum Power Point Tracking Based on Optimal Initial Value Incremental Conductance Strategy under Partially Shaded Conditions

Analysis of Dynamic Characteristic for Solar Arrays in Series and Global Maximum Power Point Tracking Based on Optimal Initial Value Incremental Conductance Strategy under Partially Shaded Conditions

Proposal for an Active PV Array to Improve System Efficiency During Partial Shading

Photovoltaic Maximum Power Point Tracker for a Multiple-Input SEPIC Under Partial Shading Condition

Contact Info

Product

Resources

About