ACTUAL PATHWAYS FOR SOLAR ENERGY DEVELOPMENT BASED ON THE MATERIALS OF THE SCIENTIFIC AND PRACTICAL CONFERENCE «RENEWABLE ENERGY AND ENERGY EFFICIENCY IN THE 21ST CENTURY» 2025
The main results of the reports in the section "Solar Energy" were considered and summarized. Specialists from Ukraine, the Republic of Uzbekistan, the Czech Republic and the United States of America took part in the work of the section. A total of 39 reports were presented, most o...
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| Дата: | 2025 |
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Institute of Renewable Energy National Academy of Sciences of Ukraine
2025
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Vidnovluvana energetika| _version_ | 1871103967806619648 |
|---|---|
| author | Bondarenko , D. Matiakh , S. Surzhyk, Т. Sheiko, I. |
| author_facet | Bondarenko , D. Matiakh , S. Surzhyk, Т. Sheiko, I. |
| author_institution_txt_mv | [
{
"author": "D. Bondarenko ",
"institution": "Institute of Renewable Energy of NAS of Ukraine, Kyiv, Ukraine"
},
{
"author": "S. Matiakh ",
"institution": "Institute of Renewable Energy of NAS of Ukraine, Kyiv, Ukraine"
},
{
"author": " Т. Surzhyk",
"institution": "Institute of Renewable Energy of NAS of Ukraine, Kyiv, Ukraine"
},
{
"author": " I. Sheiko",
"institution": "Institute of Renewable Energy of NAS of Ukraine, Kyiv, Ukraine"
}
] |
| author_sort | Bondarenko , D. |
| baseUrl_str | https://ve.org.ua/index.php/journal/oai |
| collection | OJS |
| datestamp_date | 2026-07-18T06:32:22Z |
| description | The main results of the reports in the section "Solar Energy" were considered and summarized. Specialists from Ukraine, the Republic of Uzbekistan, the Czech Republic and the United States of America took part in the work of the section. A total of 39 reports were presented, most of which concerned issues of increasing the efficiency and ensuring the stability, reliability and uninterrupted operation of solar power plants. Several reports were devoted to research in solar thermal energy, in particular, technologies of solar passive thermal power.  |
| doi_str_mv | 10.36296/1819-8058.2025.3(82).82-88 |
| first_indexed | 2025-10-01T01:30:53Z |
| format | Article |
| fulltext |
82
Відновлювана енергетика. № 3/2025 | Сонячна енергетика
УДК620.91 https://doi.org/10.36296/1819-8058.2025.3(82).82-88
ACTUAL PATHWAYS FOR SOLAR ENERGY DEVELOPMENT BASED ON THE MATERIALS OF THE
SCIENTIFIC AND PRACTICAL CONFERENCE
«RENEWABLE ENERGY AND ENERGY EFFICIENCY IN THE 21ST CENTURY» 2025
Received Jul. 15, 2025; accepted Sept. 22, 2025
Available online Sept. 30, 2025
Bondarenko D.1, Matiakh S.2,
Surzhyk Т.3, Sheiko I.4
Author for correspondence: Sheiko Iryna,
e-mail: Irina_Sheiko@ukr.net
The main results of the reports in the section "Solar Energy"
were considered and summarized. Specialists from Ukraine,
the Republic of Uzbekistan, the Czech Republic and the United
States of America took part in the work of the section. A total
of 39 reports were presented, most of which concerned issues
of increasing the efficiency and ensuring the stability, reliability and uninterrupted operation of solar power plants.
Several reports were devoted to research in solar thermal energy, in particular, technologies of solar passive ther-
mal power.
Keywords: solar power plant, photovoltaic module, photovoltaic technologies, energy efficiency, solar heat power
engineering, passive solar technologies
СУЧАСНІ ШЛЯХИ РОЗВИТКУ СОНЯЧНОЇ ЕНЕРГЕТИКИ ЗА МАТЕРІАЛАМИ
НАУКОВО-ПРАКТИЧНОЇ КОНФЕРЕНЦІЇ
«ВІДНОВЛЮВАНА ЕНЕРГЕТИКА ТА ЕНЕРГОЕФЕКТИВНІСТЬ У ХХІ СТОЛІТТІ» 2025
Отримано 15 лип. 2025 р.; рекомендовано до публікації 22 вер. 2025 р.
Доступно онлайн 30 вер. 2025 р.
Бондаренко Д. В.1, Матях С. В.2,
Суржик Т. В.3, Шейко І. О.4
Автор для кореспонденції: Шейко Ірина,
e-mail: Irina_Sheiko@ukr.net
Розглянуто та узагальнено основні результати допові-
дей на секції «Сонячна енергетика». У роботі секції взяли
участь фахівці з України, Республіки Узбекистан, Чеської
республіки та Сполучених Штатів Америки. Всього було
представлено 39 доповідей, здебільшого вони стосува-
лися питань підвищення ефективності та забезпечення
стабільності, надійності й безперебійності функціонування сонячних електричних станцій. Декілька
доповідей були присвячені дослідженням у сонячний теплоенергетиці, зокрема технологіям сонячної па-
сивної теплоенергетики.
Ключові слова: сонячна електростанція, фотоелектричний модуль, фотоелектричні технології, енер-
гоефективність, сонячна теплоенергетика, пасивні сонячні технології.
1 PhD
https://orcid.org/0000-0002-5629-930X
2 PhD
https://orcid.org/0000-0002-1707-3519
3 Dr. of Science
https://orcid.org/0000-0002-1418-7748
4 Junior Researcher
https://orcid.org/0000-0002-5770-3677
1, 2, 3, 4 Institute of Renewable Energy of NAS of
Ukraine, Kyiv, Ukraine
1 канд. техн. наук
https://orcid.org/0000-0002-5629-930X
2 канд. техн. наук
https://orcid.org/0000-0002-1707-3519
3 д-р. техн. наук
https://orcid.org/0000-0002-1418-7748
4 мол. наук. співроб.
https://orcid.org/0000-0002-5770-3677
1, 2, 3, 4 Інститут відновлюваної енергетики
НАН України, м. Київ, Україна
83
Відновлювана енергетика. № 3/2025 | Сонячна енергетика
Introduction. During the work of the XXVI International Sci-
entific and Practical Conference "Renewable Energy and
Energy Efficiency in the XXI Century" (Ukraine, Kyiv, May
21–23, 2025), the "Solar Energy" section covered a range of
issues related to the further development of solar energy
in Ukraine, the Republic of Uzbekistan, the Czech Republic,
and the United States of America [1]. The conference fea-
tured 39 reports on solar energy, the majority focusing on
enhancing efficiency as well as ensuring the stability, relia-
bility, and uninterrupted operation of solar power plants.
Several reports were devoted to research in solar thermal
energy, in particular, passive solar thermal energy technol-
ogies.
The purpose of the publication is to summarize the re-
search materials presented in the reports and highlight the
trends in the development of solar energy as one of the ar-
eas of renewable energy.
Analysis of the content of the reports. In recent years, re-
newable energy sources, in particular, solar generation,
have played a key role in the development of energy sys-
tems around the world, increasing their share and presence
every year. In 2024, approximately 800-850 MW of solar
power plants for businesses and households were built in
Ukraine. As of 2024, the number of solar power plants
(SPPs) reached about 75% of all renewable energy facilities
in Ukraine [2, 3]. Solar energy can solve many problems.
Ukraine has approved a National Renewable Energy Plan,
which envisages achieving a 27% share of renewable
sources in gross final energy consumption by 2030, in par-
ticular in electricity, heat supply and transport [4]. Attract-
ing investments, introducing state-of-the-art technologies,
and supporting the state will help increase the share of re-
newable energy sources in the country's energy balance
and improve its energy independence.
The main trends in the development of solar energy in
Ukraine include [5, 6]:
• focus on decentralization – modernization of the energy
sector with a focus on the active development of small
and medium-sized energy projects in Ukraine, which
will reduce dependence on centralized energy sources;
• improvement of energy storage infrastructure – one of
the key areas for investment in solar energy;
• introduction of new technologies in solar energy – use
of more efficient photovoltaic cells, panels with double-
sided generation (bifacial panels) and technologies for
concentrating electricity.
• The results of research by solar energy experts reflected
in the conference reports were aimed at solving many
issues that correspond to current trends. They covered
both the research into improving the efficiency of solar
cells for creating solar energy systems, and issues of en-
suring the stability, reliability, uninterrupted operation
and durability of these systems.
Photovoltaics. Photovoltaic (PV) modules. Increasing the
efficiency of solar energy conversion occurs by improving
the efficiency of photovoltaic cells through the search for
new materials and methods of their processing; developing
new designs; using panels with double-sided generation
and solar energy concentrators; creating cogeneration
plants for more efficient use of solar energy.
A number of reports considered the issues of increasing the
energy efficiency of silicon solar cells, which are the most
common type of solar cells in the world. Currently, the effi-
ciency of existing monocrystalline silicon solar cells has
reached 18%-23% on an industrial scale [7], while research
aimed at increasing their efficiency is ongoing. The report
[8] considered the use of the technology of diffusion doping
of the surface layer of silicon with impurity germanium at-
oms, which leads to a change in the bandgap width of the
original silicon due to the formation of heterostructures
GexSi1-x-Si, which is one of the fundamental parameters of
the material. This, in turn, leads to an expansion of the
spectral sensitivity range, which is typical for the develop-
ment of efficient solar cells with a wide range of solar radi-
ation absorption. The report [9] was devoted to the issue
of increasing the absorption of sunlight by the surface lay-
ers of solar cells that generate electricity by treating their
smooth surfaces with texturing. Comparisons show that a
silicon cell with surface treatment achieved a short-circuit
current 1.2 times higher than a conventional solar cell. In
studies, report [10], using the technology of multi-stage
low-temperature diffusion doping, nanoclusters of impu-
rity atoms of gadolinium in silicon were obtained, which
form the so-called "hidden Schottky barriers" in the vol-
ume, the electrophysical properties of which can be used
to create new materials with improved characteristics, as
well as new optoelectronic elements. According to the au-
thors, this opens up great opportunities for the use of such
materials in the creation of new, highly efficient solar cells
with a high degree of integration.
The studies into perovskite solar cells, which have made sig-
nificant progress over the past decade, but still face a num-
ber of obstacles that need to be addressed before they can
be widely used, were covered in the reports [11, 12]. In the
report [11], inverted perovskite solar cells were studied,
which, due to the optical properties of the electron
transport layer (ETL) and hole transport layer (HTL), can
outperform traditional perovskite solar cells. Elements with
NiOx/CH3NH3Pb3/ETL structures were studied (ETL as
MoO3, TiO2, ZnO). Using TCAD modeling to determine the
optimal geometric dimensions of the inverted perovskite
solar cell, the thickness of the ETL and HTL layers was grad-
ually changed, while the thickness of the perovskite ab-
sorber layer was adjusted. The results of the research de-
termined the optimal NiOx thickness for all structures and
the efficiency of inverted perovskite solar cells with ZnO,
MoO3 and TiO2 as ETL with the optimal layer thickness. The
report [12] presents an overview of the structural and fun-
damental aspects of perovskite solar cells that lead to sig-
nificant performance improvements, as well as creative
strategies to improve their stability in extreme environ-
ments such as high temperatures and prolonged illumina-
tion.
84
Відновлювана енергетика. № 3/2025 | Сонячна енергетика
The report [13] presented the results of studies on dye-sen-
sitized metal oxides, which are widely studied as an alter-
native to silicon solar cells. Analysis of the photoelectro-
chemical characteristics of the obtained electrodes based
on ZnO and TiO2, which were sensitized to visible light with
a cationic polymethine dye, showed that ZnO films in the
wavelength range of 420–620 nm have twice the photocur-
rent quantum yield compared to TiO2. Thus, a hybrid struc-
ture “dye – ZnO”, sensitive to visible light, is formed, which
can be used for photoelectrochemical cells for solar energy
conversion.
The report [14] identified effective approaches to the use of
solar energy. It was found that the temperature of a solar cell
undergoes significant changes as a result of the light expo-
sure on its surface, i.e. the heating effect has a significant im-
pact on key electrophysical parameters, in particular, it leads
to an increase in the recombination of charge carriers. Exper-
imental studies conducted in the temperature range from
270 K to 390 K revealed a significant increase in the fraction
of Shockley-Reed-Hall (SRH) recombination.
A number of reports were devoted to the development of
new PV module designs. In report [15], the mechanical sta-
bility of silicon wafers for solar cells was analyzed using digi-
tal modeling on the COMSOL Multiphysics® platform. Based
on the results of modeling and experimental studies, a new
design of a flexible photovoltaic energy converter with a
wide curvature range was developed to cover both convex
and concave surfaces of various objects. In report [16], the
practical development of optimal designs based on modeling
of new technically adapted to the climate photovoltaic en-
ergy devices that can be cooled by rotating around their axis
is presented. One of the critical problems for solar panels is
excessive surface heating due to high ambient temperatures,
which leads to a decrease in efficiency. A new 3D format of a
photovoltaic energy device (PVED) with a vertically-axial py-
ramidal structure, characterized by self-cooling properties
and technical adaptation to climatic conditions, is proposed.
Due to its geometric characteristics, in particular, the three-
dimensional structure and optimized heat transfer proper-
ties, the device was found to effectively reduce the temper-
ature coefficient and ensure long-term stable operation. This
innovative device was shown to improve the energy conver-
sion efficiency by 33–40%. In the report [17], the relationship
between the open-circuit voltage and light intensity for tri-
angular and rectangular solar cells with the same surface
area was investigated. It was found that at low light intensity,
the open-circuit voltage of rectangular solar cells based on
polycrystalline silicon is higher compared to triangular sam-
ples. In the report [18], factors affecting the efficiency of
photovoltaic cells were considered, one of which is the dete-
rioration of the main characteristics of the module (open-cir-
cuit voltage and power) with increasing temperature. To in-
crease performance, it was proposed to use cooling of solar
panels, which most often occurs using water or air. The use
of air cooling is proposed as the simplest and most cost-ef-
fective method, using natural or forced air flow to remove
heat. The report [19] analyzed the effect of mechanical load-
ing on solar panels. It confirmed a significant negative impact
on the performance of silicon-based solar panels, in
particular, a deterioration in photovoltaic performance due
to bending and breakage of the glass coating.
The research of specialists [20, 21] was aimed at increasing
the efficiency of double-sided photosensitive solar cells,
which are capable of providing an increase in generation ef-
ficiency by 15-20% [22]. In the report [20], research was car-
ried out for single-sided and double-sided photosensitive so-
lar cells by coating them with an anti-reflective layer with the
application of SiO2 with a thickness of 100 nm on the surface
of the sample as an anti-reflective layer for both types of so-
lar cells. Calculations were carried out by modeling single-
sided and double-sided photosensitive solar cells with a
thickness of 20 μm using the Sentaurus TCAD software. Ac-
cording to the results, it was found that the current density
reached 28 mA/cm2 for a double-sided solar cell and 22
mA/cm2 for a single-sided solar cell. The report [21] presents
the results of the analysis of the reflective properties of ma-
terials that can be used to increase the efficiency of double-
sided solar modules. It has been determined that to signifi-
cantly increase the efficiency of two-sided PV modules, it is
better to use white reflective surfaces of modules. The best
among such materials is nanoPAN, which is comparable in
reflective properties to natural white snow. Using nanoPAN
as a reflector for two-sided PV modules allows to increase
the open-circuit voltage of the module.
In the report [23], experts studied solar cells based on
multi-junction heterostructures (GaInP/GaIn/Ge). This type
of photovoltaic cells has the highest efficiency in concen-
trated solar radiation with a concentration coefficient of
100...1000. The basic principle of concentrating photovol-
taic systems is to use optics to focus sunlight onto a small
photovoltaic cell. For the research, an experimental device
with a solar energy concentrator based on Fresnel lenses
was developed. It was shown that the area of the solar cell
can be reduced by a factor equal to the concentration co-
efficient, and the radiation intensity can be increased by
the same factor. It is recommended to use thermal energy
and an active cooling system to cool photovoltaic cells.
The practical application of combined photovoltaic mod-
ules was discussed in reports [24, 25]. In report [24], a de-
sign of a combined flat solar panel for simultaneous pro-
duction of heat and electricity with a coolant moving in a
glass channel on the front side of a classic polycrystalline
solar panel was presented. A mathematical model of en-
ergy transfer in PV/T was developed. The photovoltaic
panel was considered as a multilayer body with ideal ther-
mal contacts between the layers. The conducted computer
simulation showed broad prospects for the use of such en-
ergy systems. The report proposes [25] the use of a hybrid
photovoltaic thermal collector [26] for hydrogen produc-
tion In particular, for the most promising electrolyzer with
a proton exchange membrane, for which heated water is
used as a raw material, it is advisable to use the thermal
part of the hybrid collector. Calculations and modeling of
the system using electrical models are presented, as well as
an electrical model of a hybrid photovoltaic thermal collec-
tor with an electrolyzer connected to it.
85
Відновлювана енергетика. № 3/2025 | Сонячна енергетика
The report [27] reviewed and characterized individual types
of combined modules manufactured in the world. Today,
the improvement of the characteristics of combined mod-
ules is carried out by improving the design of the absorbing
panel; searching for a suitable nanofluid circulating in the
module; the possibility of convenient splitting of the light
beam into certain wavelengths and subsequent adjustment
of the corresponding type of solar cells to these waves. Var-
iants of structural and technological solutions for combined
solar modules were proposed, depending on the purposes
of their application.
The issue of reflection of solar radiation rays by photovol-
taic modules was considered in the report [28]. To reduce
the negative impact of reflected rays, it was proposed to
use masking, which can reduce the amount of electricity
generated by PV modules. According to the results of ex-
perimental studies, it was found that the use of masking did
not significantly reduce the amount of generation for low-
power PV modules, but provided that the mask is installed
directly on the panel. Masks with minimal impact on elec-
tricity generation are presented, made from available ma-
terials (red and green polyethylene film); one of the mask
materials is agricultural canvas, which can be used in one,
two or three layers.
Photovoltaics. Solar power plants. One of the problematic
issues in the large-scale use of solar power plants is the
daily and seasonal change in insolation. In addition, the dis-
crepancy between the daily peak of photovoltaic genera-
tion and the periods of peak loads in the electrical network
in the case of mass implementation of solar power plants
leads to a surplus of generation during the day. Therefore,
the issue of energy storage is one of the key areas of devel-
opment of solar power. The report [29] considers ways to
increase the efficiency of solar power plants within the gen-
eral energy system by implementing electricity storage sys-
tems and optimizing the peak of solar power plant genera-
tion due to a change in orientation relative to the sun. It is
shown that in the intra-daily cycle for short-term storage, it
is advisable to use large-capacity storage clusters based on
electric batteries together with generating photovoltaic ca-
pacities. In the annual cycle, given the rapid development
of green hydrogen energy, it is possible to use the surplus
of photovoltaic generation during the period of maximum
insolation to obtain green hydrogen. Thus, the drop in solar
generation in the winter period can be covered by using
green hydrogen stored in storage. The report [30] presents
the results of a review of the structures of energy com-
plexes based on solar power plants and battery energy stor-
age systems. Various types of connections of accumulators
to solar power plants are analyzed. One of the possible so-
lutions to this problem for SPPs is battery energy storage
and storage systems (BESS, EESS technologies), especially
for distributed energy systems. BESS provide a stable and
reliable power supply due to high speed and density of en-
ergy storage, sufficient power, which allows them to be
used to regulate the frequency and power of power sys-
tems. BESS makes it possible to store electricity generated
by solar panels during peak hours of generation and use it
during periods of low productivity or increased demand.
Planning of the power system development should be car-
ried out taking into account the balance reliability. There-
fore, the issue of increasing the accuracy of forecasting the
generation schedules of solar power plants is extremely im-
portant, which will reduce the need for balancing capaci-
ties, and therefore, ensure the balance reliability of the
power system of Ukraine in conditions of sharp fluctuations
in the variable generation of solar power plants. The pur-
pose of the research is to identify the optimal periods for
the operation of solar power plants and assess their eco-
nomic and energy potential. The report [31] presented the
results of experimental studies of the change in the surface
temperature of photovoltaic modules of a 2.4 MW solar
power plant , which is located in the city of Merefa, Kharkiv
region, depending on the air temperature and the average
hourly power output of the plant. The results of the com-
prehensive analysis of the potential for using solar power
generation in the city of Odesa are presented in the report
[32]. The analysis is based on meteorological data obtained
from the local weather station, in particular data on solar
radiation, temperature and other parameters that affect
the efficiency of solar power plants. Using modern data
processing tools, graphs were constructed that demon-
strate seasonal and daily fluctuations in parameters. The
results obtained allow us to formulate practical recommen-
dations for the placement and operation of solar power
plants in the city of Odesa. The report [33] evaluates the
efficiency and productivity of a 100 kW network solar pho-
tovoltaic system installed on the building of the Faculty of
Electrical Engineering of the Andijan Machine-Building In-
stitute. The results of research based on data collected
from January to December 2024 are presented. The report
[34] considers the prospects for the use of solar energy in
Uzbekistan and Central Asia, a region that has the neces-
sary solar resources and technological paths to become
leaders in its implementation. It is shown that thanks to sci-
entific research and innovative engineering solutions, prob-
lems with the implementation of photovoltaic systems
caused by the harsh climate of the region can be solved.
Reports [35, 36] were devoted to the issues of determining
the optimal approach in calculating a photovoltaic power
plant or choosing a photovoltaic module. In the report [35],
it was proposed to use multiple generation of synthetic
daily insolation series in calculating photovoltaic power
plants, which reproduce short-term autocorrelation pro-
cesses of insolation changes in the real range of root-mean-
square deviations from the averaged values. Usually, in
contrast to this approach, averaged multi-year solar radia-
tion data for a certain region are used in calculations. It is
shown that synthetic series of peak solar hours PSH(n) are
the most helpful tool in solving problems of optimizing the
component composition of autonomous and backup power
supply systems with high reliability. The report [36] pro-
posed that when choosing a photovoltaic module model for
tasks related to electricity generation, the method of sim-
plifying the model based on the criterion of annual
86
Відновлювана енергетика. № 3/2025 | Сонячна енергетика
electricity generation should be applied, i.e., it is advisable
to use the simplest model that provides sufficient accuracy.
The results of the study of the impact of partial shading on
the performance of photovoltaic modules were presented
in the report [37]. The analysis was carried out at the ex-
perimental photovoltaic station of Vinnytsia National Tech-
nical University. The results showed that losses occur only
in current and power, while voltage showed a smaller im-
pact in partial shade. The analysis and modeling conducted
prove the need to take into account the shading of photo-
voltaic modules, since it directly affects the accuracy of the
forecasts. The greatest impact on the forecast results is
caused by shading in the autumn-winter period, when
shading is observed by neighboring rows of panels.
The report [38] presents an analysis of literature sources
and performs full-scale and mathematical modeling of the
modes of photovoltaic stations and distribution electrical
networks. This made it possible to explain the dependence
of the reliability and uninterrupted operation of power
transformers in distribution networks on the operating
mode of networks and photovoltaic stations. The main pro-
cesses that cause overheating of parts of power transform-
ers and become the cause of their failure are highlighted.
The analysis and modeling conducted prove the direct in-
fluence of the operating modes of photovoltaic stations,
and accordingly, the modes of distribution electrical sys-
tems on the reliability and uninterrupted operation of
power transformers used in these networks.
Since solar power plants play a substantial role in the power
and electricity balance of electric power systems, it is cru-
cial to know how much electricity and on what schedule in
time SPPs can generate it. In addition to solar insolation,
another reason for unstable generation of SPPs is their
technical condition, in particular, the gradual degradation
of photovoltaic modules. The effective functioning and du-
rability of photovoltaic systems require regular mainte-
nance and diagnostics. Identification of defects in photo-
voltaic systems at the early stages of development will help
to avoid costly and long-term repairs. A number of confer-
ence reports were devoted to these problems. In report
[39], a hardware-software complex was developed to solve
the problem of forecasting SPP generation, which was
shown for monitoring, classifying and detecting malfunc-
tions (damages) in the operation of SPPs and identifying
their technical condition taking into account retrospective
data. The proposed method involves two stages: 1) model-
ing, during which a mathematical model of the process of
functioning of solar power plants is created based on retro-
spective data on their operation with the determination of
the dead zone and the formation of a neuro-fuzzy genera-
tion algorithm; 2) the monitoring and forecasting process
to detect and diagnose the appearance of defects or mal-
functions, in which the system operates in real time, con-
trolling the technical condition of the PV modules. The re-
port [40] presents a pilot autonomous system for
determining the parameters of photovoltaic modules. This
system is developed on the Raspberry Pi microcomputer
platform and allows you to measure the V-I characteristic
and determine the main PV module parameters in field
conditions within a few seconds. These parameters are as-
sociated with a single-diode replacement scheme for pho-
tovoltaic cells and characterize the current operating char-
acteristics of the PV modules: real maximum power,
electrical losses and the degree of their degradation. The
results of the study of methods for determining the degra-
dation of photovoltaic modules, including electrochemical
impedance spectroscopy (EIS), were discussed in a report
[41]. In particular, the EIS method shows significant pro-
spects as a non-destructive diagnostic method for assessing
the degradation of solar panels. As recent studies show, EIS
applies a small alternating voltage to the solar cell and
measures the current response, calculating the impedance
from the amplitude coefficient and the phase difference
between the applied voltage and the resulting current. By
changing the frequencies and analyzing the Nyquist and
Bode diagrams, researchers successfully detected mechan-
ical degradation in solar cells by comparing the values of
the equivalent circuit elements in the normal and degraded
states. An assessment of waste management problems in
the solar energy sector of Ukraine was also conducted. The
report [42] presents a thermal image-based defect detec-
tion technology that effectively reduces energy losses, es-
pecially in large photovoltaic systems. The problem was
solved using general methods of theoretical analysis of the
problem based on the study of the physical properties of
photovoltaic systems and the features of their diagnostics.
A methodology for selecting and combining various diag-
nostic technologies, in particular electroluminescent test-
ing and the use of machine learning algorithms, was devel-
oped to increase the accuracy of fault detection and
minimize operating costs. A theoretical model for deter-
mining the parameters of photovoltaic modules that vary
depending on the load voltage was presented in the report
[43]. It was shown that when calculating the current-volt-
age characteristics of photovoltaic modules, a single-diode
model with variable parameters provides a good match be-
tween theoretical and experimental data, namely the nor-
malized root mean square deviation is nRMSE ≈ 0.2%. But
unlike conventional multi-diode models with fixed parame-
ters, the proposed approach gives a more adequate idea of
the recombination and resistive losses in photovoltaic cells.
Solar thermal energy. Several reports were devoted to re-
search on improving solar thermal systems and on the use
of passive solar thermal technologies in the southern re-
gions of Ukraine.
The use of passive solar technologies for heat supply was
proposed in the report [44]. A method of accelerated res-
toration of low-rise residential buildings destroyed in hos-
tilities on the territory of Ukraine, using available building
materials and passive solar technologies for their heat sup-
ply, is considered. An analytical study was conducted on
the use of clay concrete with organic filler (straw) for the
construction of low-rise solar passive houses in the territo-
ries of Ukraine, provided that these territories have organic
raw materials (straw) and sufficient reserves of clay soils
with a clay fraction content of 15%. Clay concrete with
87
Відновлювана енергетика. № 3/2025 | Сонячна енергетика
organic filler (straw) is an environmentally friendly organic
building material that is made from local and relatively in-
expensive raw materials: soils with a high content of clay
matter, organic agricultural waste (wheat straw). The main
requirements that building materials and products must
meet have been determined.
The report [45] presents the development of an innovative
technology for increasing the efficiency of a modern solar
water heater by installing a reflective base between the base
and the pipes. Using the Comsol Multiphysics program, an
improved solar collector was studied, and the distribution of
water velocity, density distribution, and temperature distri-
bution in its pipe were analyzed. It was shown that due to its
new optimal design, the improved solar collector is 8% more
efficient than conventional collectors.
The results of the analysis of the energy balance of a solar
installation operating in a free heat exchange mode using
an electric stimulator of coolant circulation at the outlet are
given in the report [46]. The influence of the main parame-
ters, such as solar radiation intensity, ambient temperature
and coolant circulation speed, on the efficiency of the sys-
tem was studied. It was found that the use of an electric
stimulator ensures the stability of the coolant movement
and improves heat transfer.
The report [47] proposed the use of energy management
system software when choosing a solar collector for heat-
ing social and administrative buildings, which is important
for making a decision on the use of solar collectors in the
construction sector and when considering energy manage-
ment issues. As a result, a draft commercial offer is formed
for the customer, which contains detailed information
about the cost of the project, expected economic benefits
and other important factors.
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___________________________________
1 Renewable Energy and Energy Efficiency in the 21st Century:
Materials of the 26th International Scientific and Practical
Conference (Kyiv, 21–23 May 2025). Kyiv: Institute of Renew-
able Energy of the National Academy of Sciences of Ukraine,
2025. 568 p.
By link: https://www.ive.org.ua/wp-content/up-
loads/Tezy_2025.pdf
DOI: https://doi.org/10.36296/renewable.conf.21-
23.05.2025
https://studlib.org.ua/tsikave/sonyachna-energetyka-v-ukrayini-suchasnyj-stan-ta-majbutnye/
https://studlib.org.ua/tsikave/sonyachna-energetyka-v-ukrayini-suchasnyj-stan-ta-majbutnye/
https://doi.org/10.1007/978-3-031-67091-6_16
|
| id | veorgua-article-552 |
| institution | Vidnovluvana energetika |
| keywords_txt_mv | keywords |
| language | English |
| last_indexed | 2026-07-19T01:16:37Z |
| publishDate | 2025 |
| publisher | Institute of Renewable Energy National Academy of Sciences of Ukraine |
| record_format | ojs |
| resource_txt_mv | veorgua/b0/55fb18c40c423d8870c68bf45bafe3b0.pdf |
| spelling | veorgua-article-5522026-07-18T06:32:22Z ACTUAL PATHWAYS FOR SOLAR ENERGY DEVELOPMENT BASED ON THE MATERIALS OF THE SCIENTIFIC AND PRACTICAL CONFERENCE «RENEWABLE ENERGY AND ENERGY EFFICIENCY IN THE 21ST CENTURY» 2025 СУЧАСНІ ШЛЯХИ РОЗВИТКУ СОНЯЧНОЇ ЕНЕРГЕТИКИ ЗА МАТЕРІАЛАМИ НАУКОВО-ПРАКТИЧНОЇ КОНФЕРЕНЦІЇ «ВІДНОВЛЮВАНА ЕНЕРГЕТИКА ТА ЕНЕРГОЕФЕКТИВНІСТЬ У ХХІ СТОЛІТТІ» 2025 Bondarenko , D. Matiakh , S. Surzhyk, Т. Sheiko, I. solar power plant, photovoltaic module, photovoltaic technologies, energy efficiency, solar heat power engineering, passive solar technologies сонячна електростанція, фотоелектричний модуль, фотоелектричні технології, енергоефективність, сонячна теплоенергетика, пасивні сонячні технології. The main results of the reports in the section "Solar Energy" were considered and summarized. Specialists from Ukraine, the Republic of Uzbekistan, the Czech Republic and the United States of America took part in the work of the section. A total of 39 reports were presented, most of which concerned issues of increasing the efficiency and ensuring the stability, reliability and uninterrupted operation of solar power plants. Several reports were devoted to research in solar thermal energy, in particular, technologies of solar passive thermal power.  Розглянуто та узагальнено основні результати доповідей на секції «Сонячна енергетика». У роботі секції взяли участь фахівці з України, Республіки Узбекистан, Чеської республіки та Сполучених Штатів Америки. Всього було представлено 39 доповідей, здебільшого вони стосувалися питань підвищення ефективності та забезпечення стабільності, надійності й безперебійності функціонування сонячних електричних станцій. Декілька доповідей були присвячені дослідженням у сонячний теплоенергетиці, зокрема технологіям сонячної пасивної теплоенергетики.      Institute of Renewable Energy National Academy of Sciences of Ukraine 2025-09-28 Article Article application/pdf https://ve.org.ua/index.php/journal/article/view/552 10.36296/1819-8058.2025.3(82).82-88 Vidnovluvana energetika ; No. 3(82) (2025): Scientific and applied Journal renewable energy ; 82-88 Возобновляемая энергетика; ##issue.no## 3(82) (2025): Scientific and applied Journal renewable energy ; 82-88 Відновлювана енергетика; № 3(82) (2025): Науково-прикладний журнал Відновлювана енергетика; 82-88 2664-8172 1819-8058 10.36296/1819-8058.2025.3(82) en https://ve.org.ua/index.php/journal/article/view/552/462 Copyright (c) 2025 D. Bondarenko , S. Matiakh , Т. Surzhyk, I. Sheiko https://creativecommons.org/licenses/by-nc-nd/4.0 |
| spellingShingle | solar power plant photovoltaic module photovoltaic technologies energy efficiency solar heat power engineering passive solar technologies Bondarenko , D. Matiakh , S. Surzhyk, Т. Sheiko, I. ACTUAL PATHWAYS FOR SOLAR ENERGY DEVELOPMENT BASED ON THE MATERIALS OF THE SCIENTIFIC AND PRACTICAL CONFERENCE «RENEWABLE ENERGY AND ENERGY EFFICIENCY IN THE 21ST CENTURY» 2025 |
| title | ACTUAL PATHWAYS FOR SOLAR ENERGY DEVELOPMENT BASED ON THE MATERIALS OF THE SCIENTIFIC AND PRACTICAL CONFERENCE «RENEWABLE ENERGY AND ENERGY EFFICIENCY IN THE 21ST CENTURY» 2025 |
| title_alt | СУЧАСНІ ШЛЯХИ РОЗВИТКУ СОНЯЧНОЇ ЕНЕРГЕТИКИ ЗА МАТЕРІАЛАМИ НАУКОВО-ПРАКТИЧНОЇ КОНФЕРЕНЦІЇ «ВІДНОВЛЮВАНА ЕНЕРГЕТИКА ТА ЕНЕРГОЕФЕКТИВНІСТЬ У ХХІ СТОЛІТТІ» 2025 |
| title_full | ACTUAL PATHWAYS FOR SOLAR ENERGY DEVELOPMENT BASED ON THE MATERIALS OF THE SCIENTIFIC AND PRACTICAL CONFERENCE «RENEWABLE ENERGY AND ENERGY EFFICIENCY IN THE 21ST CENTURY» 2025 |
| title_fullStr | ACTUAL PATHWAYS FOR SOLAR ENERGY DEVELOPMENT BASED ON THE MATERIALS OF THE SCIENTIFIC AND PRACTICAL CONFERENCE «RENEWABLE ENERGY AND ENERGY EFFICIENCY IN THE 21ST CENTURY» 2025 |
| title_full_unstemmed | ACTUAL PATHWAYS FOR SOLAR ENERGY DEVELOPMENT BASED ON THE MATERIALS OF THE SCIENTIFIC AND PRACTICAL CONFERENCE «RENEWABLE ENERGY AND ENERGY EFFICIENCY IN THE 21ST CENTURY» 2025 |
| title_short | ACTUAL PATHWAYS FOR SOLAR ENERGY DEVELOPMENT BASED ON THE MATERIALS OF THE SCIENTIFIC AND PRACTICAL CONFERENCE «RENEWABLE ENERGY AND ENERGY EFFICIENCY IN THE 21ST CENTURY» 2025 |
| title_sort | actual pathways for solar energy development based on the materials of the scientific and practical conference «renewable energy and energy efficiency in the 21st century» 2025 |
| topic | solar power plant photovoltaic module photovoltaic technologies energy efficiency solar heat power engineering passive solar technologies |
| topic_facet | solar power plant photovoltaic module photovoltaic technologies energy efficiency solar heat power engineering passive solar technologies сонячна електростанція фотоелектричний модуль фотоелектричні технології енергоефективність сонячна теплоенергетика пасивні сонячні технології. |
| url | https://ve.org.ua/index.php/journal/article/view/552 |
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