scholarly journals On-Site Traversal Fractional Open Circuit Voltage with Uninterrupted Output Power for Maximal Power Point Tracking of Photovoltaic Systems

Electronics ◽  
2020 ◽  
Vol 9 (11) ◽  
pp. 1802
Author(s):  
Ling Bu ◽  
Shengjiang Quan ◽  
Jiarong Han ◽  
Feng Li ◽  
Qingzhao Li ◽  
...  
Keyword(s):  
Solar Cell ◽  
Output Power ◽  
Open Circuit Voltage ◽  
Open Circuit ◽  
Photovoltaic Systems ◽  
Ripple Effect ◽  
Tracking Accuracy ◽  
Maximal Power ◽  
Point Tracking ◽  
Power Point

The fractional open-circuit voltage (FOCV) method is commonly adopted to track maximal power point of photovoltaic systems due to easy implementation and cost-effectiveness. However, the FOCV method is confronted with unstable output power and limited tracking accuracy. This paper proposes a novel on-site traversal FOCV method with uninterrupted output power and increased tracking accuracy through simulation and experimental verifications. Each solar cell is connected with a bypass diode and switching circuitry, so that specific solar cell can be traced and measured consecutively for determining its maximal power point (MPP). MATLAB/Simulink simulation results show that, in the time-varying irradiance case, the proposed method achieves a low ripple factor of 0.13% in 11–13 h and 0.88% in 9–15 h, under the typical 24 h irradiance curve. In the spatial-varying irradiance case, the accuracy of the proposed method reaches 99.85%. Compared with other FOCV methods, like pilot cell and semi pilot cell methods, the proposed method is of higher accuracy with a limited ripple effect. Experimental results show that this method can effectively trace different output performance of specific solar cell while generating stable output voltage with a low ripple factor of 1.55%, proving its compatibility with distributed sensing and applicability in smart photovoltaic systems.

The Improvement of Solar Cell Output Power Using Cooling and Reflection from Mirror

2017 ◽  
Vol 8 (3) ◽  
pp. 1320
Author(s):  
Budiyanto Budiyanto ◽  
Fadliondi Fadliondi
Keyword(s):  
Experimental Investigation ◽  
Solar Cell ◽  
Output Power ◽  
Open Circuit Voltage ◽  
Open Circuit ◽  
Maximum Power ◽  
Light Reflection

This paper explains the experimental investigation to improve the output power of solar cell using cooling and light reflection from mirrors. The results show that by adding mirror, the current and output power of solar cell increase but the open circuit voltage and maximum power voltage decrease due to heat. By adding cooling, the open circuit voltage and the maximum power voltage are improved, so the output power also increases.

scholarly journals Improved Fractional Open Circuit Voltage MPPT Methods for PV Systems

Electronics ◽  
2019 ◽  
Vol 8 (3) ◽  
pp. 321 ◽  
Author(s):  
Dmitry Baimel ◽  
Saad Tapuchi ◽  
Yoash Levron ◽  
Juri Belikov
Keyword(s):  
Open Circuit Voltage ◽  
Open Circuit ◽  
Maximum Power ◽  
Pv System ◽  
Maximum Power Point ◽  
Pv Systems ◽  
Point Tracking ◽  
Pv Panel ◽  
Power Point Tracking ◽  
Power Point

This paper proposes two new Maximum Power Point Tracking (MPPT) methods which improve the conventional Fractional Open Circuit Voltage (FOCV) method. The main novelty is a switched semi-pilot cell that is used for measuring the open-circuit voltage. In the first method this voltage is measured on the semi-pilot cell located at the edge of PV panel. During the measurement the semi-pilot cell is disconnected from the panel by a pair of transistors, and bypassed by a diode. In the second Semi-Pilot Panel method the open circuit voltage is measured on a pilot panel in a large PV system. The proposed methods are validated using simulations and experiments. It is shown that both methods can accurately estimate the maximum power point voltage, and hence improve the system efficiency.

scholarly journals A Hybrid Maximum Power Point Tracking Approach for Photovoltaic Systems under Partial Shading Conditions Using a Modified Genetic Algorithm and the Firefly Algorithm

2018 ◽  
Vol 2018 ◽  
pp. 1-13 ◽  
Author(s):  
Yu-Pei Huang ◽  
Xiang Chen ◽  
Cheng-En Ye
Keyword(s):  
Genetic Algorithm ◽  
Firefly Algorithm ◽  
High Accuracy ◽  
Photovoltaic Systems ◽  
Tracking Accuracy ◽  
Maximum Power Point ◽  
Partial Shading ◽  
Point Tracking ◽  
Power Point Tracking ◽  
Power Point

This paper proposes a modified maximum power point tracking (MPPT) algorithm for photovoltaic systems under rapidly changing partial shading conditions (PSCs). The proposed algorithm integrates a genetic algorithm (GA) and the firefly algorithm (FA) and further improves its calculation process via a differential evolution (DE) algorithm. The conventional GA is not advisable for MPPT because of its complicated calculations and low accuracy under PSCs. In this study, we simplified the GA calculations with the integration of the DE mutation process and FA attractive process. Results from both the simulation and evaluation verify that the proposed algorithm provides rapid response time and high accuracy due to the simplified processing. For instance, evaluation results demonstrate that when compared to the conventional GA, the execution time and tracking accuracy of the proposed algorithm can be, respectively, improved around 69.4% and 4.16%. In addition, in comparison to FA, the tracking speed and tracking accuracy of the proposed algorithm can be improved around 42.9% and 1.85%, respectively. Consequently, the major improvement of the proposed method when evaluated against the conventional GA and FA is tracking speed. Moreover, this research provides a framework to integrate multiple nature-inspired algorithms for MPPT. Furthermore, the proposed method is adaptable to different types of solar panels and different system formats with specifically designed equations, the advantages of which are rapid tracking speed with high accuracy under PSCs.

scholarly journals An Advanced MPPT Scheme for Standalone Solar powered PV System using Neuro-Fuzzy Estimator based on measured data

2021 ◽  
Author(s):  
Ferdaws Ben Naceur ◽  
◽  
Abdelaziz Salah Saidi ◽  
Javed Khan Bhutto ◽  
Mohamed Ali Mahjoub ◽  
...  
Keyword(s):  
Open Circuit Voltage ◽  
Open Circuit ◽  
Maximum Power ◽  
Weather Data ◽  
Pv System ◽  
Photovoltaic Panel ◽  
Point Tracking ◽  
Neuro Fuzzy ◽  
Solar Powered ◽  
Power Point

This paper deals with the problem of the optimization of the power, delivered by the photovoltaic panel (PVP). To achieve this aim, a neuro-fuzzy estimator (NFE), followed by a conversion coefficient and a calculation stage of the optimal duty cycle, has been developed. The NFE is used to calculate the open circuit voltage corresponding to each solar radiation, based only on the standard open circuit voltage. A coefficient, determining for each climatic condition the voltage of the maximum power directly from the open circuit voltage, is estimated by a measured test. Finally, the optimal duty cycles, next, determined by the input/output equation of boost converter. The system performance, under different scenarios, has been checked carrying out MATLAB simulations, using an existing photovoltaic model and real weather data, and comparing the simulation results with the measured one. The results demonstrate the effectiveness of the present approach. The efficiency of the proposal maximum power point tracking (MPPT) is proved and it showed that this controller can generate almost 99% of the real PVP maximum power.

Comparison of Maximum Power Point Tracking (MPPT) Algorithms to Control DC-DC Converters in Photovoltaic Systems

2019 ◽  
Vol 12 (4) ◽  
pp. 355-367 ◽  
Author(s):  
Milad Samady Shadlu
Keyword(s):  
High Performance ◽  
Low Voltage ◽  
Open Circuit ◽  
Maximum Power ◽  
Extremum Seeking ◽  
Photovoltaic Systems ◽  
Maximum Power Point ◽  
Point Tracking ◽  
Pv Panel ◽  
Power Point

Background: Using the solar energy by photovoltaic arrays is constantly increasing and has been considered as one of the cleanest sources of energy in recent years. One of the ways to reduce the cost of photovoltaic systems is to maximize the power delivered to the load. On the other hand, changing the load leads to change the operating point of the solar conversion system and causes deviation from the maximum power point (MPP). Methods: For this reason, in various research studies, attention has been paid to MPPT methods applicable in photovoltaic systems. In this paper, a comparison is performed between conventional MPPT methods including Perturb and Observe (P&O), Incremental Conductance (INC), Fractional Open Circuit Voltage (FOCV), Ripple Correlation Control (RCC) and Extremum Seeking Control (ESC). Only current and voltage parameters of the PV panel are measured instantly and used to generate control signals. However, the output voltage of the PV cells is relatively low without using the DC-DC converters. Results: Therefore, high-performance DC-DC converters need to convert the low voltage PV arrays into high DC voltages to handle the 220 VAC systems. Conclusion: Accordingly, in this study, conventional DC-DC converters including Boost, Buck and Buck-Boost converters are investigated, and each of them is simulated using different MPPT controllers and the results are compared together. It is worth noting that all of the simulations are carried out using MATLAB/Simulink.

A Novel Computational Approach towards Maximum Power Point Tracking for Solar Photovoltaic and Wind Energy Systems

2014 ◽  
Vol 592-594 ◽  
pp. 2331-2335
Author(s):  
Singh Ajal Puneet ◽  
Dahiya Ratna
Keyword(s):  
Open Circuit Voltage ◽  
Energy Systems ◽  
Open Circuit ◽  
Maximum Power ◽  
Solar Photovoltaic ◽  
Maximum Power Point ◽  
Point Tracking ◽  
Power Point Tracking ◽  
Power Point ◽  
Wind Energy Systems

In this paper a new approach for maximum power point tracking (MPPT) is proposed. The fractional open circuit voltage based MPPT states that the photovoltaic (PV) array voltage corresponding to the maximum power gives a linear dependence with respect to array open circuit voltage for different irradiation and temperature levels. This method is the easiest and simplest of all the MPPT methods but the disconnection of the PV array from the load on regular intervals for the sampling of the array voltage causes significant power loss. A new and simple approach is proposed by the simple linear equation of line for calculating the duty cycle of the boost converter which will extract the maximum power for the particular radiations. This topology can also be used for Wind energy systems but here the simulation is done with solar photovoltaic only. The proposed work is verified using MATLAB/SIMULNK and simulation results shows a clear improvement in achieving the desired results.

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