Phase Shifting Transformer has played an important role in electrical networks to improve
their efficiency because it has the ability to control power flow in electrical transmission network
that can lead to power loss minimization. PST technology
is considered as mature technology
which is used by transmission system operators. These transformers provide an integrated solution
to control power due to the advantages of low economic and high reliability.
In this research an exposure to the classification of phase shifting transformers and their
application then a simple model for Phase shifting transformer is suggested without seeking in the
details of transformer, this model presents the result for using PST via modeling phase shifting
voltage, this model is performed using Matlab/Simulink program according to differential
equation. Depending on the mathematical model which has been built in an Matlab environment
we have a model shows the impact of this transformer through the representation of output voltage
, results are verified using Neplan program via a case study demonstrated the role of this type of
transformers in controlling power flow in transmission system achieving remarkable power loss
reduction and improving voltage profile
The use of DC and especially VSC-HVDC systems are
considered as urgent and important in electrical networks to
improve their efficiency because they have great benefits not only in
connecting different frequency networks and connecting the
renewa
ble energy to the network, but also control power flow in a
way that reduce the losses and achieve the optimal flow electrical
networks especially in networks that contain more than one energy
supplier and thus can achieve economic benefits as well as the
scheduling of importing energy from another that may improve
network stability.
Types of HVDC system and a comparison between them are
achieved in this research after that simulation IEEE with VSCHVDC,
and integrated computer program was proposed this
program can create and store three-dimension matrix so the working
area can be scanned so minimum loss working point can be
detected.
The building sector is considered one of the leading sectors in energy-consumption.
In addition to lighting, heating and cooling systems have become important consumers in all buildings (both residential, administrative, and service both private and
public) ensuring
a comfortable environment for staff and workers and improving productivity at the lowest possible cost. This research aims to study the control quantities of fresh and exhausted air in large halls and auditoriums, where the occupancy level changes. This is done by adjusting the amount of fresh and exhausted air according to the occupancy via CO2 sensors, which measure the ratio of CO2 in the targeted places, controlling the volume of fresh and exhausted air according to the number of available people. A case study was done to use control systems; final results and conclusions have been illustrated.
