Efficiency of maximum power point tracking in photovoltaic system under variable solar irradiance

Maranda, Witold; Piotrowicz, Maciej

doi:10.2478/bpasts-2014-0077

Cited by 8 publications

(2 citation statements)

References 13 publications

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“…Due to the environmental anxieties regarding pollution, species extinction, climate changes, deposit acid and suchlike, the increasing efforts to decrease the carbon emissions from the energy sector has created an all-round interest in renewable energy and related technologies, which has led to progress and innovation of renewable based technologies [1]. The continued growth of scientific endeavors in this field leads to incremental installations of Renewable Energy Sources (RESs) such as Wind Turbine (WT), Photovoltaic (PV), Fuel Cell (FC), and Battery Energy Storage (BES) accompanied by providing exceptional opportunities for cost-effective load schedule and demand response program [2][3][4]. Microgrid including these resources has provided a reliable electrical power for sensitive loads via large integrated VPP [5,6].…”

Section: Introductionmentioning

confidence: 99%

Bulletin of the Polish Academy of Sciences: Technical Sciences

Khanjanzadeh,

Soleymani,

Mozafari

2021

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In this paper, a novel Power-Frequency Droop Control (PFDC) is introduced to perfectly bring back the system frequency and share the reactive power in isolated microgrid with virtual power plant (VPP). The frequency-based power delivery must be essentially implemented in VPP which can operate as a conventional synchronous generator. It has been attained by enhancing the power processing unit of each VPP to operate as an active generator. The inverter coupling impedance which has been assigned by the virtual impedance technique has reduced the affected power coupling resulting from line resistance. The reference has been subsequently adjusted to compensate the frequency deviation caused by load variation and retrieve the VPP frequency to its nominal value. In addition, the line voltage drop has compensated the voltage drop and load sharing error to obliterate the reactive power sharing imprecision resulting from the voltage deviation. The voltage feedback confirms the correct voltage after compensating the voltage drop. As an illustration, conventional PFDC after a load change cannot restore the system frequency which is deviated from 50 Hz and rested in 49.9 Hz while, proposed PFDC strategy fades away the frequency deviation via compensating the variation of the frequency reference. Likewise, the frequency restoration factor (γ ) has an effective role in retrieving the system frequency, i.e., the restoration rate of the system frequency is in proportion with γ . As a whole, the simulation results have pointed to the high performance of proposed strategy in an isolated microgrid.

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Section: Introductionmentioning

confidence: 99%

Bulletin of the Polish Academy of Sciences: Technical Sciences

Khanjanzadeh,

Soleymani,

Mozafari

2021

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“…Progress in the area of microgrids is undeniably related to the earlier progress of distributed generation. Different aspects regarding the processes of designing and operating distributed generation units, as well as connecting the units to the distribution grids via power electronics converters, have been presented among others in [1][2][3][4].…”

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confidence: 99%

Bulletin of the Polish Academy of Sciences: Technical Sciences

Parol¹,

Rokicki²,

Parol³

2019

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The paper raises the issue of controlling rural low voltage microgrids in an optimal manner. The impact of different criterion functions, related to the amount of energy exchanged with the distribution system operator network, the level of active power losses, the amount of energy generated by different energy sources and the value of financial performance measures regarding the microgrid operation, on the choice of operating points for devices suggested by the optimization algorithm has been analyzed. Both island and synchronous microgrid operation modes are being considered. We propose two variants of the optimization procedure: the first one is based on the particle swarm optimization algorithm and centralized control logic, and the second one takes advantage of the decentralized approach and Monte Carlo methods. A comparison of the simulation results for two sample rural microgrids, obtained for different objective functions, microgrid operation modes and optimization procedure variants, with the use of prepared algorithm implementations, has been provided. The results show that the proper choice of an objective function can have a crucial impact on the optimization algorithm's behavior, the choice of operating points and, as a consequence, on microgrid behavior as well. The choice of the proper form of the objective function is the responsibility of the person in charge of both the microgrid itself and its operation. This paper can contribute towards making correct decisions in this area. Generally, slightly better results have been achieved for the centralized control mode of operation. Nevertheless, the results also suggest that in many cases the approach based on distributed logic can return results that are better or sufficiently close to the ones provided by the centralized and more sophisticated approach.

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Methodology for detection of photovoltaic systems underperformance operation based on the correlation of irradiance estimates of neighboring systems

Popović

Radovanović

2018

Journal of Renewable and Sustainable Energy

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The methodology for the detection of under-performance operation of neighbouring photovoltaic systems is presented. The methodology compares the estimations of the total horizontal solar irradiance obtained from a group of photovoltaic systems. The estimations can be obtained from the direct measurement of the solar irradiance or indirectly by utilizing the group of methods for the processing of electrical signals at the output of the photovoltaic system. Inter-system comparison is performed solely during the system operation under the detected clear-sky conditions, as this atmospheric condition in a predictable manner affects the incident solar irradiance at the arbitrary surface area. We assume that the measurement or the estimation of the total horizontal solar irradiance in close proximity area under the particular clear-sky condition is expected to produce comparable results. In order to provide the comparable estimations, the methodology introduces the system efficiency factor to address various influences on the operation of the photovoltaic system, which are not easily addressable in analytical form. These influences are related to different physical, installation, and operational properties of the photovoltaic system, including aging, manufacturing tolerances, and other technology-related properties. The methods for the empirical assessment of the system efficiency factor as well as for the correlation-related processing are also given as a part of the proposed methodology. The utilization of the methodology for the detection of the under-performance operation is verified through the presented case study.

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Efficiency of maximum power point tracking in photovoltaic system under variable solar irradiance

Cited by 8 publications

References 13 publications

Bulletin of the Polish Academy of Sciences: Technical Sciences

Bulletin of the Polish Academy of Sciences: Technical Sciences

Bulletin of the Polish Academy of Sciences: Technical Sciences

Methodology for detection of photovoltaic systems underperformance operation based on the correlation of irradiance estimates of neighboring systems

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