30-01-2013, 04:49 PM
Design and Simulation of Supercapacitor Energy Storage System
[attachment=48975]
Abstract.
STATCOMs are widely used to enhance power
system stability. They can exchange reactive power with the
power system, but they have limited ability to exchange real
power because they don’t include energy storage devices.
STATCOMs coupled with energy storage devices such as
batteries have been introduced to improve their ability to
exchange real power. However, batteries have a limitation in
their maximum deliverable power because of the slow chemical
process required to release their energy. The trend now is to use
supercapacitor energy storage systems "SCESS" as energy
storage for STATCOMS. Supercapacitors have lower energy
storage but higher power exchanging capability compared to
batteries. This paper presents the analysis, design, and control of
a supercapacitor energy storage system (SCESS) for a
STATCOM. A peak current mode controller is used to control
the SCESS system. Simulation results of the SCESS system are
presented which indicate excellent performance of the proposed
SCESS system.
Introduction
STATCOMs are widely used to enhance power system
stability. STATCOMs by their own can exchange reactive
power with the power system, but they have limited ability
to exchange real power because they don’t include energy
storage devices. STATCOMs coupled with energy storage
devices such as batteries have been introduced to improve
their ability to exchange real power. However, batteries
have a limitation in their maximum deliverable power
because of the slow chemical process required to release
their energy. The trend now is to use supercapacitor
energy storage systems "SCESS" as energy storage for
STATCOMs. Supercapacitors have lower energy storage
but higher power exchanging capability compared to
batteries.
STATCOM
Power system stability and power system quality can be
enhanced by utilizing STATCOMs “Static synchronous
compensators”. STATCOM is one member of the FACTS
“Flexible Alternating Current Transmission System”
devices. It can exchange power with the power system.
STATCOM can either be designed with or without an
energy source. STATCOMs without energy sources
mainly exchange reactive power with the power system,
while STATCOMs with energy sources can exchange both
reactive and real power [1].
Simulation of SCESS
A MATLAB/SIMULINK simulation model was built for
the SCESS system. It consists of the power circuit and the
control circuit. The power circuit (Figure 5) consists of
the supercapacitor, the inductor, the boost and buck
IGBTs, the dc link capacitor, the dc load, and the
switched on/off dc source. The DC load and the DC
source represent a simplification of the STATCOM.
Conclusion
STATCOM-SCESS is a promising technology for
improving power system stability and quality. A brief
literature survey was presented about the use of
STATCOM-SCESS in various power system applications.
The parameters and control schemes for the STATCOMSCESS
were discussed. A simulation model was built and
tested for the SCESS system on MATLAB/SIMULINK.
The test shows that the SCESS system can maintain the dc
link voltage by exchanging real power, which gives the
STATCOM-SCESS the ability to exchange real power
with the system.
[attachment=48975]
Abstract.
STATCOMs are widely used to enhance power
system stability. They can exchange reactive power with the
power system, but they have limited ability to exchange real
power because they don’t include energy storage devices.
STATCOMs coupled with energy storage devices such as
batteries have been introduced to improve their ability to
exchange real power. However, batteries have a limitation in
their maximum deliverable power because of the slow chemical
process required to release their energy. The trend now is to use
supercapacitor energy storage systems "SCESS" as energy
storage for STATCOMS. Supercapacitors have lower energy
storage but higher power exchanging capability compared to
batteries. This paper presents the analysis, design, and control of
a supercapacitor energy storage system (SCESS) for a
STATCOM. A peak current mode controller is used to control
the SCESS system. Simulation results of the SCESS system are
presented which indicate excellent performance of the proposed
SCESS system.
Introduction
STATCOMs are widely used to enhance power system
stability. STATCOMs by their own can exchange reactive
power with the power system, but they have limited ability
to exchange real power because they don’t include energy
storage devices. STATCOMs coupled with energy storage
devices such as batteries have been introduced to improve
their ability to exchange real power. However, batteries
have a limitation in their maximum deliverable power
because of the slow chemical process required to release
their energy. The trend now is to use supercapacitor
energy storage systems "SCESS" as energy storage for
STATCOMs. Supercapacitors have lower energy storage
but higher power exchanging capability compared to
batteries.
STATCOM
Power system stability and power system quality can be
enhanced by utilizing STATCOMs “Static synchronous
compensators”. STATCOM is one member of the FACTS
“Flexible Alternating Current Transmission System”
devices. It can exchange power with the power system.
STATCOM can either be designed with or without an
energy source. STATCOMs without energy sources
mainly exchange reactive power with the power system,
while STATCOMs with energy sources can exchange both
reactive and real power [1].
Simulation of SCESS
A MATLAB/SIMULINK simulation model was built for
the SCESS system. It consists of the power circuit and the
control circuit. The power circuit (Figure 5) consists of
the supercapacitor, the inductor, the boost and buck
IGBTs, the dc link capacitor, the dc load, and the
switched on/off dc source. The DC load and the DC
source represent a simplification of the STATCOM.
Conclusion
STATCOM-SCESS is a promising technology for
improving power system stability and quality. A brief
literature survey was presented about the use of
STATCOM-SCESS in various power system applications.
The parameters and control schemes for the STATCOMSCESS
were discussed. A simulation model was built and
tested for the SCESS system on MATLAB/SIMULINK.
The test shows that the SCESS system can maintain the dc
link voltage by exchanging real power, which gives the
STATCOM-SCESS the ability to exchange real power
with the system.