Post on 04-Apr-2018
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UTILITY APPLICATIONSOFPOWER ELECTRONICS
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Outlines:-
Introduction.
Power Semiconductor Device & Their
Capabilities.
Categorization Of Power Electronics System.
Distributed Generation(DG) Applications.
Role of Power Electronics in Important Utility
Applications.
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Introduction
Power electronics applications in utility
systems are growing very rapidly, which
promise to change the future of power
system(Distributed generation, Power quality
solutions, Transmission & Distribution),electrical drives & control. Also gives an
outstanding performance in power supply
design and power converter operation &
control.
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The fig. shows commonly used symbols of powerdevice & their power handling capabilities
POWER SEMICONDUCTOR DEVICES &
THEIR CAPABILITIES
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CATEGORIZATION OF POWER
ELECTRONICS SYSTEMBroadly a power electronics in power system
applications is further categorized as:-
osolid state switches-
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oConverters as an interface-
Power electronics converters provide the needed
interface between the electrical source and the load.
These interfaces can be classified as below.
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Voltage link systems
The semiconductor devices such as transistors ofvarious types and diodes can only be used in thissystem.
These devices with only unipolar voltage-blockingcapability led to have the structure with two converters
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Current link systems
Thyristors can block voltage of both polarities butconduct current only in the forward direction.
This capability has led to the interface realized by
thyristor-converters with a dc-current link in the middle,
as shown above.8
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DISTRIBUTED GENERATION(DG)
APPLICATIONS
Distributed generation promises to change the
landscape to how power systems of the future will
be operated and control.
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These generators may have decentralized (local)
control, in addition to a central supervisory control.
There is a move away from large central power plantstowards distributed generation due to environmental
and economic reasons. Many of them are discussed
bellow:-
Wind electric system. Photovoltaic(PV) system.
Fuel cell system.
Micro turbines.
Energy storage system.
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Wind electric system:-
In this system, the stator which produces most of the
power is connecting directly to the grid. The rotor
windings are accessible through slip-rings and brushes toa power electronic convertor system, which supply the
rotor current.
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Photovoltaic system:-
The PV arrays provide a voltage of 52V to 90V DC, which
by the power electronics system converts to 120V/60Hz
sinusoidal voltage suitable for interfacing with the 1-utility PV module are expensive & for higher o/p
connected in parallel.
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Fuel cell systems:-
A fuel cell is an electro-chemical device which produce
electricity and the output is a dc voltage. After which the
need of power electronics circuit as same as fuel cellsystem.
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Micro turbine:-
These used highly efficient aircraft engines with the
natural gas as the I/P fuel, to improve the efficiency
frequency of the generated O/P to vary, requiring apower electronics interface, originally designed for
aircrafts and helicopters.
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Energy Storage System:-
Usually at night when load demand is low, It is
possible to store energy in Lead-acid batteries, in
Superconducting Magnetic Energy Storage(SMES)electrochemical capacitors (ultra caps) and in the
inertia of flywheel.
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ROLEOF POWER ELECTRONICSIN
IMPORTANT UTILITY APPLICATIONS
o Power Electronic Loads:- Adjustable SpeedDrives
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o Power Quality Solutions for:-
Dual Feeders.
Uninterruptable Power Supply.
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o Transmission and Distribution (T&D)System:-
High Voltage DC(HVDC) and Medium VoltageDC(MCDV) Transmission
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STATIC VAR COMPENSATION
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Thank You.
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