Power electronic technology is one of the
emerging electronic technology, is widely applied in the field of
power inverter, and with the research and development of frequency conversion
technology, the development of power inverter has a strong guarantee, at
present, the role of electronic power technology mainly in power inverter,
transmission, distribution and so on each link. See below power inverter in using the basic situation of each part.
The use of in the power inverter link
Power system of power inverter link involves
generating set a variety of equipment, the application of power electronic
technology to improve the running characteristics of the equipment for the main
purpose.
(a) large static excitation control of
generators.
Static excitation adopts thyristor rectifying self shunt excitation
method, with simple structure, high reliability and low cost advantages, are
widely used in electric power systems around the world.
Due to eliminating the
inertia exciter the intermediate links, thus has its peculiar velocity
adjustment, gives advanced control laws give full play to the role and the
advantage of good control effect.
Hydroelectric power effective power depends on
the pressure head and flow rate, when the change range of water head is big
(especially for pumped storage units), units of the best transfer rate also
changes.
The effective power of the grid tie inverter and wind speed of the direct
ratio three times, the windmill to capture the maximum wind speed varies with
wind speed change. For maximum effective grid tie inverter, can make the speed change
operation, by adjusting the frequency of the rotor excitation current, with the
rotor speed after stacking the output frequency of the stator frequency
constant.
The application of the core technology is the variable frequency
grid tie inverter.
(3) power plant fan, water pump frequency control
of motor speed.
Power plant auxiliary power rate averaged 8%, fan, water pump
power consumption accounts for about 65% of the total grid tie inverter of
thermal power equipment, and the low operating efficiency.
Using low voltage or
high voltage inverter, the effect of fan, water pump frequency control, can
achieve the goal of energy saving.
Low voltage frequency
solar power inverter
has very mature, has many manufacturers at home and abroad, and a complete
series of products.
(4) solar power inverter control system.
The
development and utilization of endless clean new energy - solar power inverter, is the
future energy structure adjustment is an important strategic measure.
High
power solar power inverter, both independent system and grid tie inverter system, usually need to be
direct current into alternating current from solar power inverter array, so has the most
power tracing function of inverter become the core of the system.
Sunshine
program for Japan in 3 ~ 4 kw in grid-connected power generation system is
given priority to, sending to the countryside on the implementation of
engineering in our country is in the majority with 10 ~ 15 kw of independent
system, the large system of Siemens in California (7.2 MW) solar power plants,
etc.
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