Name
Bogatyrev Nikolay Ivanovich
Scholastic degree
•
Academic rank
associated professor
Honorary rank
—
Organization, job position
Kuban State Agrarian University
Web site url
—
Articles count: 11
A promising is currently the use of asynchronous generators with capacitive excitation as a source of electricity in stand-alone power systems. Drive asynchronous generators may exercise as a thermal engine and wind wheel wind power plant or turbines of small hydropower plants. The article discusses the structural and schematics of voltage stabilizers and frequency of asynchronous generators with improved operational and technical specifications. Technical novelty of design solutions of the magnetic system and stabilizers asynchronous generator of electricity parameters confirmed by the patents for the invention of the Russian Federation. The proposed technical solution voltage stabilizer asynchronous generators, can reduce the weight of the block capacitors excitation and reactive power compensation, as well as to simplify the control system power circuit which has less power electronic devices. For wind power plants it is an important issue not only to stabilize the voltage of the generator, but also the frequency of the current. Recommend functionality stabilizer schemes parameters of electric power made for direct frequency converters with artificial and natural switching power electronic devices. It is also proposed as part of stabilization systems use single-phase voltage, three-phase transformers with rotating magnetic field, reduce the level of electromagnetic interference generated by power electronic devices for switching, enhance the efficiency and reliability of the stabilizer.
The article contain the peculiarities of testing asynchronous
generator with sixzone winding on the basis
of the asynchronous motor series 4A100S4 and analysis
of obtained characteristics. Circuit parameters of
the stator winding can significantly affect the characteristics
of the asynchronous generator. Asynchronous
generator was tested with a stator winding connected
star, autotransformer and sectional winding. Use chastising
windings opens the possibility of applying various
circuits of capacitors and the load to asynchronous
generators, which in turn affect the efficiency and stabilizing
properties of the electric machine. Asynchronous
generators to test with sectional winding by confirmation
of theoretical calculations for determine the
most optimal scheme under connect capacitors and
load, testing the stator winding. The volume of testing
for asynchronous generators standard is not defined, so
we proposed testing method, taking into account the
design features of the stator winding. Asynchronous
generators were tested with the help of special equipment
with the use of analyzer of energy power quality.
Article contains characteristics of idling, short circuit
and others, considered the heat mode. On the basis of
the results we have determined the parameters of the
circuit, the efficiency and power factor of induction
generator
Influence of circuit and constructive signs of stator windings on parameters and operational properties of asynchronous generators is examined
Due to the recommendation of the World Health
Organization, the standard rate of vegetables
consumption for a person per year is 130-150 kg,
including up to 15 kg of fresh production during the
off-season. To meet these standards in Russia, the
construction of greenhouses and greenhouse
complexes was sped up. To cultivate the bulk of
vegetables in the conditions of protected soil we have
mostly used winter greenhouses. At the same time, in
terms of the climatic conditions, the main production
costs are accounted for energy carriers (up to 60 –
70%). The main consumers of energy in greenhouses
are plants’ lighting and creation of the required
temperature conditions for plants and soil. Annual
increase of rates for energy carriers affects the cost of
the greenhouses’ production. To increase the energy
efficiency and independence in greenhouse complexes,
it is proposed to use installations based on gas
reciprocating units (GRU) for the production of two
types of energy – electric and thermal. Such
installations can run on the natural gas and other types
of fuel. The drawback of existing installations is that
they are mainly produced abroad or consist of the
foreign components. As an alternative, we offer new
technical solutions, which were developed and
patented in the Russian Federation. What makes these
solutions original is that asynchronous generators in
the installations are used with various control schemes
In poultry industry, animal breeding, greenhouses and
vegetable stores a significant amount of fans with
asynchronous motors is used to create a microclimate.
The fan speed of the fan should be regulated in order
to improve the efficiency, so the multispeed motors are
used for the fan drives. Line produced two-speed motors
with a proportion of the poles number 1:2 have a
polar-switched Dahlander stator winding. Two-speed
motors with a proportion of the poles number 3:2 and
4:3 have only one stator winding which is poleswitched
by the method of amplitude phase shift keying.
A drawback of the windings is that they have different
energy indicators at different spin rates. In order
to create rational diagrams with switching according to
the number of poles, which is multiple of three, it is
proposed to implement a polyphase MMF modulation
of the three-phase winding. As a result of the study,
there were procured the stator windings at 4 and 6
poles, which enabled to change the spin speed of the
motor in the fan drives without breaking the drive
power circuit by the scheme Δ / ΥΥ
Demands to power sources of a welding arc and the results of development of such supplies are considered
Analysis of 40 years’ making and evolution of one of the subject area on Electric machines and electric drive department is presented
Influence of circuit and constructive signs of stator and rotor windings on parameters and operational properties of asynchronous generators is examined
Influence of circuit and constructive signs of stator and rotor windings on parameters and operational properties of asynchronous generators is examined