Name
Grigorash Oleg Vladimirovich
Scholastic degree
•
Academic rank
professor
Honorary rank
—
Organization, job position
Kuban State Agrarian University
Web site url
—
Articles count: 65
One of the important issues in the design of static
converters of electric power, i.e. rectifiers and
inverters, is to calculate the parameters of the output
and the input filters. Output filters are designed to
improve the quality of output voltage of inverters, and
input filters are created to reduce ripple of the input
voltage of the converter that occur when commuting
power semiconductor devices, and smoothing
fluctuations of the current consumed from the power
supply. The complexity of analytical description of
the harmonic composition of the output and the input
of the voltage rectifiers and inverters makes it
difficult to develop some accurate methods for
calculating the parameters of their filters. At the same
time, considering the discreteness of the number of
possible parameters of real elements of the filter, the
practical value of such techniques with a high analysis
accuracy of the harmonic components is negligible. In
this article, we suggest the technique of the simplified
calculation of output and input filters for passive LC
filters rectifiers and inverters. At the same time, the
practice of mathematical modeling and design of
transducers has shown that the calculations of the
filter parameters for rectifiers and inverters are not
significantly different from each other. Therefore, the
analytical expressions for calculation of the filter
parameters of rectifier used ripple coefficient, and if
necessary the calculation of the filters of the inverter,
instead of the pulse number in the formula can be
substituted with the value of the harmonic; in
addition, we have also taken into account the value of
the load power factor
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
The article presents a method of assessing the quality of individual students' knowledge and the quality of the group, taking into account professional training of teachers, who taught their classes
The article considers the peculiarities of the management of monitoring visits to classes faculty by the head of the chair; we have also proposed criteria and indicators for assessing their quality
The level of technical development today requires the creation of highly effective, including reliable, uninter-rupted power supply systems. We have shown modern requirements and design features of modern systems of uninterruptible power supply, which should be built on a modular principle. It is shown that the problem of synthesis of systems in a modular approach is addressing three issues: development of the structure of the system subject to the requirements of consumers to quality of power and the allowable time of power outage; determining the required level redundancy of major functional units (blocks, elements) to ensure the required reliability of the system; - ensuring the most effective interconnection of modules, including electromagnetic compatibility, and the rational use during normal and emergency operation of the system. We have proposed new structural solution of the main functional units and uninterrupted power supply systems in modular design. To reduce EMI and improve efficiency uninterruptible power supply systems in the design of static converters we need to use a transformer with a rotating magnetic field. In addition, the prospective current is to be used as a source of renewable energy. Another promising approach is the use of direct frequency converters as voltage stabilizers and frequency of the current
The article discusses a promising direction, aimed at improving the operational and technical characteristics of the autonomous power supply systems, through the use of a part of their gas piston power plants, wind pow-er and solar photovoltaic installations
The article discusses the new structural schematics stabilizers of voltage and frequency contactless power generators wind power installations
The article discusses the structural schematics of solar
energy systems, providing guaranteed power supply
to electricity consumers with priority for consumers
of the 1st category. The work describes main
functions performed by modern energy systems. It is
shown that nowadays solar power systems of
uninterruptable power supply are classified into three
types: independent; hybrid (combined); intellectual.
We have given the structural scheme of solar systems
power systems of uninterruptable power supply and
the features of their work. The article describes a
monitoring system, carrying out functions of control
and measurement of parameters of the power system
depends on its performance. The economic
performance of a solar power system has been
influenced essentially by the cost of solar and
accumulator batteries. The principal technical
characteristics of modern solar and regular batteries
of the best companies were compared. We have also
given recommendations for improving the operational
characteristics of solar energy systems of guaranteed
power supply, in which special attention is paid to
technical characteristics of the main functional
elements of the system, including electromagnetic
compatibility
The article discusses the structural and control systems schematics and voltage stabilization in phase bridge circuits solar power inverters with PWM output voltage and improved performance
In the article, there were cited the resources of wind en-ergetic, hydroenergetic, solar energetic and biomass of the Krasnodar region