ABSTRACTTraditional power grids are now transformed into Smart Grids (SGs) in order to solve the problems of energy wastage, energy control, uni-directional flow of information, growing energy demand, reliability, measurement and security. Smart grids increase the automation, coordination and connectivity between these electricity suppliers, electricity users and networks used in local distribution tasks and long distance transmission. Smart Grids offer bi-directional energy flow between elec...
ABSTRACTThe document outlines an
investigation done in order to study Fifth Generation (5G) systems and to
identify a role that satellite systems will play in contribution to the many
advanced and diverse demands on existing telecommunication networks.
generation network is a build-up and phenomenal improvement in wireless
communication done by the “5GPP” on the already existing mobile generations.
The evolution has seen us move from first generation which employed...
Commutation failures are very frequent dynamic events in high
voltage dc (HVDC) transmission systems. Commutation failure is mostly observed
at the inverter side of HVDC links, where large firing angles are used. The
minimum value of the extinction angle required for the proper operation of a
valve is specified by the valve manufacturer; however, at the inverter side of
HVDC systems the extinction angle is regulated to a value higher than the valve
specifications to allow control adjust...
The conversion of
an input AC power at a given frequency and voltage to an output power at
different frequency and voltage can be obtained with static circuits called
power converters, containing controllable power electronic devices. Various
power converters have been developed to fulfill the requirements of the wind
power generation. The most common option for the
generators used in wind power generation is “asynchronous”, because support for
speed variations is provi...
The power system is a highly nonlinear
system that operates in a constantly changing environment; loads, generator
outputs, voltage controllers, transmission lines, topology, and key operating
parameters change continually. The behavior and output of the generators can be
affected in a transient conditions. This transient condition can change the
excitation and dynamics of the rotor which in turn produces undesirable
oscillations of the system frequency and voltage magnitude. When subje...
Industrial drive applications
are generally classified into constant-speed and variable-speed drives.
Traditionally, AC machines have been used in constant-speed applications and DC
machines were preferred for variable-speed. Induction machine with drive
systems are widely used in applications such as pumps, paper and textile mills,
elevators, electric vehicle, subway transportation, home appliance and wind
generation. The three-phase squirrel cage induction motor is the mos...