scholarly journals DC-link sensorless control strategy for grid-connected PV systems

2021 ◽  
Author(s):  
Mostafa Ahmed ◽  
Mohamed Abdelrahem ◽  
Ahmed Farhan ◽  
Ibrahim Harbi ◽  
Ralph Kennel
Keyword(s):  
Sensorless Control ◽  
Current Loop ◽  
Sensor Failure ◽  
Atmospheric Conditions ◽  
Step Size ◽  
Pv System ◽  
Control Approach ◽  
Control Loops ◽  
Pv Systems ◽  
The Cost

AbstractSensorless strategies become very popular in modern control techniques because they increase the system reliability. Besides, they can be used as back-up control in case of sensor failure. In this paper, a DC-link sensorless control approach is developed, which is suited for grid-connected PV systems. The studied system is a two-stage PV scheme, where the DC–DC stage (boost converter) is controlled using an adaptive step-size perturb and observe (P&O) method. Further, the inverter control is accomplished by voltage oriented control (VOC). Generally, the VOC is implemented with two cascaded control loops, namely an outer voltage loop and an inner current loop. However, in this work, the outer loop is avoided and the reference current is generated using a losses model for the system. The losses model accounts for the most significant losses in the PV system. Moreover, particle swarm optimization (PSO) is utilized to compensate for the unmodeled losses. The PSO is executed offline for the purpose of calculation burden reduction. The proposed approach simplifies the cascaded VOC strategy and eliminates the DC-link voltage sensor, which in turn decreases the cost of the system. Finally, the proposed technique is compared with the conventional one at different atmospheric conditions and validated using MATLAB simulation results.

A Novelty Control Strategy for the Photovoltaic Supercapacitor and Battery Hybrids Storage System

2011 ◽  
Vol 301-303 ◽  
pp. 1522-1527
Author(s):  
Yi Yuan ◽  
Mohamed Machmoum ◽  
Salvy Bourguet ◽  
Nicolas Amelon
Keyword(s):  
Control Strategy ◽  
Storage System ◽  
Pv System ◽  
Photovoltaic Panel ◽  
Pv Systems ◽  
Power Product ◽  
Pv Panel ◽  
The Cost ◽  
Large Burst ◽  
Reasonable Energy

Most photovoltaic (PV) systems can supply continuous energy by using storage applications. Generally, the battery is employed for finishing this aim. The expense of the battery occupies a large part in the whole PV system. However, the constant variations of both photovoltaic panel power product and load power demand reduce the life of the battery. At the same time, for providing several large burst power demands generated by the motor based application startup, the sizing of battery should be enlarged. Both of them increase the cost of the PV system. Therefore, supercapacitor is integrated into this system. With a reasonable energy control strategy among the PV panel, supercapacitor and battery, the battery’s life could be prolonged and its size can be reduced. A PV system with hybrid storage applications is established in the Matlab/Simulink. Two different loads and weather situations are used to prove the efficiency of this control strategy.

scholarly journals Variable Step Size P&O MPPT Controller to Improve Static and Dynamic PV System Performances

2018 ◽  
Vol 2 (2) ◽  
pp. 86 ◽  
Author(s):  
Hamza Bahri ◽  
Abdelghani Harrag
Keyword(s):  
Photovoltaic System ◽  
Variable Step Size ◽  
Atmospheric Conditions ◽  
Step Size ◽  
Pv System ◽  
Solar Module ◽  
Creative Commons ◽  
Study Results ◽  
Variable Step ◽  
Steady State Oscillation

In this paper, a variable step size P&O algorithm is used in order to improve the performance of a photovoltaic system in both dynamic and static plans. The efficiency of the proposed algorithm has been investigated successfully using the BP SX150S solar module connected to the DC-DC derived by a P&O MPPT algorithm. The comparative study results of both conventional fixed step size and the proposed variable step size P&O algorithms prove the effectiveness of the proposed algorithm compared to the standard fixed step size PO MPPT. The proposed algorithm reduces response time between 13.86% and 45.28% and the steady state oscillation between 83.33% and 100% leading to less power loss especially in case of fast changing atmospheric conditions.  This is an Open Access article distributed under the terms of the Creative Commons Attribution License (http://creativecommons.org/licenses/by/4.0/), which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

scholarly journals A Variable Step Size Incremental Conductance Direct MPPT Method for Stand-Alone PV Systems

2012 ◽  
Vol 16 (7) ◽  
pp. 881-887
Author(s):  
Jae-Hoon Cho ◽  
◽  
Jin-Il Park ◽  
Won-Pyo Hong ◽  
Myung-Geun Chun ◽  
...  
Keyword(s):  
Dynamic Performance ◽  
Maximum Power ◽  
Solar Irradiation ◽  
Fuzzy Membership ◽  
Variable Step Size ◽  
Step Size ◽  
Pv System ◽  
Pv Systems ◽  
Incremental Conductance ◽  
Variable Step

This paper presents a variable step size incrementalconductance direct Maximum Power Point Tracking (MPPT) method using fuzzy membership for a standalone photovoltaic (PV) system under rapidly changing irradiation. MPPT techniques have been widely applied in PV systems to make a PV array generate maximum power, which depends on solar irradiation. In most applications of MPPT technologies, MPPT algorithm design methods are performed and tested under slowly changing atmospheric conditions such as irradiation and temperature. The short-term effect under rapidly changing irradiation should be considered, however, to improve the dynamic performance of PV system. Our proposed MPPT method is based on an incremental conductance algorithm with a direct control scheme that can directly adjust the duty cycle for the PI controller. A fuzzy membership function is adopted to determine the variable step size according to rapidly changing irradiation. The proposed methods thus has not only faster dynamic performance but also high tracking accuracy. In order to show the effect of the proposed method, the simulation model and proposed MPPT is designed with MATLAB/Simpower and simulated with MATLAB/Stateflow.

Research on MPPT Technology Based on Adaptive Area Algorithm

2011 ◽  
Vol 347-353 ◽  
pp. 1044-1048
Author(s):  
Yun Yun Chen ◽  
Jun Ji Wu ◽  
Zhan Feng Ying
Keyword(s):  
Maximum Power ◽  
Variable Step Size ◽  
Step Size ◽  
Pv System ◽  
Maximum Power Point ◽  
Climate Conditions ◽  
Pv Systems ◽  
Observation Methods ◽  
Variable Step ◽  
Power Point

Considering the fact that when the cell temperature and solar insolation change rapidly, traditional variable step size(VSS) perturbation and observation(P&O) methods exist the defects that their tracking speed is relatively slow, there is small power oscillation around MPP(Maximum Power Point) and even some of them exist the situation of tracking unsuccessfully. This paper proposes a MPPT(Maximum Power Point Tracing) technology based on adaptive area algorithm. The simulation model of PV system is established by MATLAB. The simulation results show that the proposed method can track the MPP fast and accurately, and ensure the steady state characteristics of PV systems even when the climate conditions change rapidly. It effectively overcomes the defects of traditional variable step size perturbation and observation methods.

Real Time Implementation of Variable Step Size Based P&O MPPT for PV Systems Based on dSPACE

2016 ◽  
Vol 7 (3) ◽  
pp. 915
Author(s):  
K. Muthukumar ◽  
T.S. Anandhi
Keyword(s):  
Buck Converter ◽  
Utilization Efficiency ◽  
Variable Step Size ◽  
Step Size ◽  
Pv System ◽  
Pv Systems ◽  
Point Tracking ◽  
Simulink Model ◽  
Power Point Tracking ◽  
Power Point

Nowadays Solar energy is an important energy source due to the energy crisis and environment pollution. Maximum power point tracking (MPPT) algorithm improves the utilization efficiency of a photovoltaic systems. In this paper an improved P&O MPPT algorithm is developed and simulated using MATLAB / SIMULINK to control the DC/DC buck converter. The obtained simulink model is also verified using dspace tool. Both the simulated and experimental results are validated by also comparing them with conventional MPPT methods. The performance measures show the increase in the efficiency of PV system by the proposed model.

Dynamic Performance Comparison for MPPT-PV Systems using Hybrid Pspice/Matlab Simulation

2016 ◽  
Vol 17 (5) ◽  
pp. 529-539 ◽  
Author(s):  
N. Aouchiche ◽  
M. Becherif ◽  
A. HadjArab ◽  
M. S. Aitcheikh ◽  
H. S. Ramadan ◽  
...  
Keyword(s):  
Dynamic Performance ◽  
Performance Comparison ◽  
Atmospheric Conditions ◽  
Matlab Simulation ◽  
Pv System ◽  
Simulation Tools ◽  
Pv Systems ◽  
Pv Panel ◽  
Simulation Techniques ◽  
Power Point

Abstract The power generated by solar photovoltaic (PV) module depends on the surrounding irradiance and temperature. This paper presents a hybrid Matlab™/Pspice™ simulation model of PV system, combined with Cadence software SLPS. The hybridization is performed in order to gain the advantages of both simulation tools such as accuracy and efficiency in both Pspice electronic circuit and Matlab™ mathematical modelling respectively. For this purpose, the PV panel and the boost converter are developed using Pspice™ and hybridized with the mathematical Matlab™ model of maximum power point method controller (MPPT) through SLPS. The main objective is verify the significance of using the proposed hybrid simulation techniques in comparing the different MPPT algorithms such as the perturbation and observation (P&O), incremental of conductance (Inc-Cond) and counter reaction voltage using pilot cell (Pilot-Cell). Various simulations are performed under different atmospheric conditions in order to evaluate the dynamic behaviour for the system under study in terms of stability, efficiency and rapidity.

scholarly journals Analysis of transformer less inverter for PV applications

2018 ◽  
Vol 7 (2-1) ◽  
pp. 427
Author(s):  
Selvamathi R ◽  
Indragandhi V ◽  
Ashok kumar L
Keyword(s):  
Leakage Current ◽  
Research Paper ◽  
Parasitic Capacitance ◽  
Pv System ◽  
Safety Issues ◽  
Pv Systems ◽  
Pv Inverter ◽  
The Cost

To enhance the effectiveness and decrease the cost of a Photovoltaic (PV) system, the utilization of transformer less PV inverters is an option of expanding interest. In any case, this topology should be considered in detail, as it shows a few issues like effectiveness degradation and safety issues identified with the galvanic association between the system and the PV generator.In this research paper, a review of standalone and grid-connected PV inverter structures has been done. From one viewpoint, a few options in light of established structures have been introduced. At last parasitic capacitance in PV arrays and leakage current produced from PV systems are examined.

scholarly journals Modeling, Analysis and Optimization of Grid-Integrated and Islanded Solar PV Systems for the Ethiopian Residential Sector: Considering an Emerging Utility Tariff Plan for 2021 and Beyond

Energies ◽  
2021 ◽  
Vol 14 (11) ◽  
pp. 3360
Author(s):  
Tefera Mekonnen ◽  
Ramchandra Bhandari ◽  
Venkata Ramayya
Keyword(s):  
Power Systems ◽  
Green Energy ◽  
Sensitivity Analyses ◽  
Solar Pv ◽  
Pv System ◽  
Simulation Tools ◽  
Technical Performance ◽  
Pv Systems ◽  
Cost Of Energy ◽  
The Cost

Currently, difficulties such as the depletion of fossil fuel resources and the associated environmental pollution have driven the rise of other energy systems based on green energy sources. In this research, modeling and a viability study of grid-connected and islanded photovoltaic (PV) power systems for supplying the residential load in Mekelle City, Ethiopia, were carried out considering the country’s emerging utility tariff plan for 2021 and beyond. The technical viability of the proposed supply option was analyzed using PVGIS, PVWatts and HOMER Pro tool, while the economic and environmental optimization aspects were carried out using HOMER Pro. Sensitivity analyses and output comparisons among the three renewable energy simulation tools are presented. The results showed that under the consideration of an incremental electricity tariff plan (up to 2021), the analyzed cost of energy of the grid/PV system is around 12% lower than the utility grid tariff. Moreover, we also found that by taking the continuous global solar PV cost reduction into account, the cost of energy of the modeled islanded operation of solar PV power units totally broke the grid tariff in Ethiopia after 2029 based on the tariff for 2021 and well before with the expected escalation of the grid tariff on an annual basis. The technical performance of the system realized through PVGIS and PVWatts was almost comparable to the HOMER Pro outputs. Thus, this investigation will offer a clear direction to the concerned target groups and policy developers in the evolution of PV power supply options throughout the technically viable locations in the country.

scholarly journals An optimum location of on-grid bifacial based photovoltaic system in Iraq

2022 ◽  
Vol 12 (1) ◽  
pp. 250
Author(s):  
Amina Mahmoud Shakir ◽  
Siba Monther Yousif ◽  
Anas Lateef Mahmood
Keyword(s):  
Photovoltaic System ◽  
Energy Yield ◽  
Optimum Location ◽  
Pv System ◽  
Pv Systems ◽  
Pv Module ◽  
System Module ◽  
Irradiation Level ◽  
The Cost ◽  
Suitable Location

Bifacial photovoltaic (PV) module can gain 30% more energy compared to monofacial if a suitable location were chosen. Iraq (a Middle East country) has a variable irradiation level according to its geographic coordinates, thus, the performance of PV systems differs. This paper an array (17 series, 13 parallel) was chosen to produce 100 kWp for an on-grid PV system. It investigates the PV system in three cities in Iraq (Mosul, Baghdad, and Basrah). Effect of albedo factor, high and pitch of the bifacial module on energy yield have been studied using PVsyst (software). It has been found that the effect is less for a pitch greater than 6 m. The energy gained from bifacial and monofacial PV system module in these cities shows that Mosul is the most suitable for installing both PV systems followed by Baghdad and lastly Basrah. However, in Basrah, the bifacial gain is 12% higher in the energy than monofacial as irradiation there is higher than the other locations, especially for elevation above 1.5 m. Moreover, the cost of bifacial array is 7.23% higher than monofacial, but this additional cost is acceptable since the bifacial gain is about 11.3% higher energy compared to the monofacial.

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