Name
Krivoshey Alexandr Alexandrovich
Scholastic degree
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Academic rank
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Honorary rank
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Organization, job position
Kuban State Agrarian University
Web site url
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Articles count: 3
The article discusses the features of design and
operation in the different modes of functioning of
autonomous hybrid power plants based on renewable
and traditional energy sources. We have given a
structural scheme of such a plant. It is shown that the
algorithm of the system in the autumn-winter period
should be adjusted according to the monthly
monitoring; and standby generator of independent
source can be run at a deeper discharge of batteries. It
is known that the most expensive and the weakest link
in the solar PV plants is rechargeable battery. In
addition, the larger the number they have in the
system, the more complicated the fulfillment of all
conditions of proper operation is. We have proposed
to extend the lifetime of batteries through the use of
passive balancing, which allows to increase the
reliability of operation and reduce the cost. It is
shown that a real possibility of improving the
technical and economic performance of autonomous
hybrid power plants is their execution on the basis of
solar photovoltaic power plants. We have also
discussed the features of construction and operation
of hybrid power plants, which will increase the
efficiency of preliminary works on development of
high-performance structural circuit design of the
stations
The article describes the main block diagrams of three
types of uninterruptible power supply: backup;
interactive; double conversion. The main functions
are: the function backup or emergency source of
electrical power; the function of protective devices
(from an overload currents and short-circuit);
improving the quality of the power supply voltage.
Alsoб we have disclosed the features of the advantages
and disadvantages of uninterruptible power supplies
three groups: Off-Line / Stand-By / back-up UPS
(passive - reserve); Line-Interactive (line interactive
type); On-Line. The article discloses new approaches
to structural and schematic-based uninterruptible
power supply, including at use of renewable energy, so
that the failure of one of the sources does not lead to
exit from the operation of the entire of power supply
system. As a rule, such systems are built on a modular
principle. It is shown that now for remote users from
external networks is advisable to apply a system
autonomous power supply, representing the totality of
sources and converters of electric power, ensuring
uninterrupted power supply to consumers. We have
presented a typical structure of autonomous systems
and given an option of the block diagram of the system
and are given explanations and principles of its work.
Significantly improves performance reliability of
autonomous systems using the modularity of its main
functional units. In addition, to increase the efficiency
of the system can be through the use in the
construction of transformers with static converters
rotating magnetic field. To improve the weight, which
is important for the transport systems, it is necessary to
use links with the intermediate high-frequency electric
power conversion in static converters
We have revealed the main reasons for interruptions
in power supply to consumers of electricity. To improve
the reliability and the efficiency of power supply
for responsible consumers, we have proposed to
develop energy efficient combined energy-saving
systems for uninterrupted power supply with use of
renewable energy sources. The article lists major
principles of the development of such systems; it
shows the necessity of constructing a generalized
schema that contains the possible types and the
sources of electric power converters. It also reveals
the modern requirements to systems of uninterrupted
energy supply. To improve the operational and technical
characteristics of the uninterruptible power supply,
it has been proposed to use a new circuitry that
includes a contactless power generators, the direct
frequency converters used to stabilize the voltage and
frequency of the current generators of wind turbines,
static converters made with the use of single-phase
transformers with rotating magnetic field, universal
static converters that can operate in the regimes of
known types of converters. The article presents features
of the modular construction of systems of uninterrupted
energy supply and optimization of their
structural decisions on key performance criteria. It
shows the algorithm of synthesis of structural designs
of combined systems of uninterrupted power supply.
An important step for further research with the aim of
improving operational and technical characteristics of
the combination of uninterrupted power supply systems
is the mathematical modeling of physical processes
in power circuits of the system in both normal
and emergency modes of operation