04-12-2012, 12:31 PM
Assessment of Available Transfer Capability for Power System Network with Multi-Line FACTS Device
[attachment=42387]
Abstract
This paper presents the use of an advanced and versatile member of flexible
alternating current transmission systems (FACTS) device which is interline
power flow controller (IPFC) to improve the available transfer capability
(ATC). In general, IPFC is used in multiple transmission lines of a power
system network. A mathematical model of IPFC, termed as power injection
model (PIM) is derived. A program in MATLAB has been written in order to
extend repeated power flow (RPF) method based on this model for ATC
enhancement. Numerical results are carried out on IEEE-14 bus system for
different cases to illustrate the effectiveness of IPFC for improvement of ATC.
Introduction
The latest generations of FACTS devices are unified power flow controller (UPFC)
and interline power flow controller (IPFC). It is found that, in the past, much effort
has been made in the modeling of the UPFC for power flow analysis [1]-[5].
However, UPFC aims to compensate a single transmission line, whereas the IPFC is
conceived for the compensation and power flow management of multi-line
transmission system. Interline power flow controller (IPFC) is a new member of
FACTS controllers. Like the STATCOM, SSSC and UPFC, the IPFC also employs
the voltage sourced converter as a basic building block [6].
Multi-Line FACTS Device: Interline Power Flow Controller (IPFC)
Operating Principle of IPFC
In its general form the interline power flow controller employs a number of dc-to-ac
converters each providing series compensation for a different line. In other words, the
IPFC comprises a number of Static Synchronous Series Compensators (SSSC). The
simplest IPFC consists of two back-to-back dc-to-ac converters, which are connected
in series with two transmission lines through series coupling transformers and the dc
terminals of the converters are connected together via a common dc link as shown in
Fig.1 [13]-[14].With this IPFC, in addition to providing series reactive compensation,
any converter can be controlled to supply real power to the common dc link from its
own transmission line
Power Injection Model of IPFC
In this section, a mathematical model for IPFC which will be referred to as power
injection model is derived. This model is useful to study the impact of the IPFC on the
power system network and can easily be incorporated in the power flow algorithm.
Usually, in the steady state analysis of power systems, the VSC may be represented as
a synchronous voltage source injecting an almost sinusoidal voltage with controllable
magnitude and angle. Based on this, the equivalent circuit of IPFC is shown in Fig.2.
Conclusion
In this paper, a multi-line FACTS device which is IPFC has been used to examine the
impact of IPFC on ATC enhancement. ATC is calculated using RPF method for
different cases of test system. The results demonstrate the effectiveness and
robustness of IPFC. The results obtained for test system without and with IPFC are compared and observations reveal that ATC is significantly improved with IPFC
under base case as well as line outage case.
[attachment=42387]
Abstract
This paper presents the use of an advanced and versatile member of flexible
alternating current transmission systems (FACTS) device which is interline
power flow controller (IPFC) to improve the available transfer capability
(ATC). In general, IPFC is used in multiple transmission lines of a power
system network. A mathematical model of IPFC, termed as power injection
model (PIM) is derived. A program in MATLAB has been written in order to
extend repeated power flow (RPF) method based on this model for ATC
enhancement. Numerical results are carried out on IEEE-14 bus system for
different cases to illustrate the effectiveness of IPFC for improvement of ATC.
Introduction
The latest generations of FACTS devices are unified power flow controller (UPFC)
and interline power flow controller (IPFC). It is found that, in the past, much effort
has been made in the modeling of the UPFC for power flow analysis [1]-[5].
However, UPFC aims to compensate a single transmission line, whereas the IPFC is
conceived for the compensation and power flow management of multi-line
transmission system. Interline power flow controller (IPFC) is a new member of
FACTS controllers. Like the STATCOM, SSSC and UPFC, the IPFC also employs
the voltage sourced converter as a basic building block [6].
Multi-Line FACTS Device: Interline Power Flow Controller (IPFC)
Operating Principle of IPFC
In its general form the interline power flow controller employs a number of dc-to-ac
converters each providing series compensation for a different line. In other words, the
IPFC comprises a number of Static Synchronous Series Compensators (SSSC). The
simplest IPFC consists of two back-to-back dc-to-ac converters, which are connected
in series with two transmission lines through series coupling transformers and the dc
terminals of the converters are connected together via a common dc link as shown in
Fig.1 [13]-[14].With this IPFC, in addition to providing series reactive compensation,
any converter can be controlled to supply real power to the common dc link from its
own transmission line
Power Injection Model of IPFC
In this section, a mathematical model for IPFC which will be referred to as power
injection model is derived. This model is useful to study the impact of the IPFC on the
power system network and can easily be incorporated in the power flow algorithm.
Usually, in the steady state analysis of power systems, the VSC may be represented as
a synchronous voltage source injecting an almost sinusoidal voltage with controllable
magnitude and angle. Based on this, the equivalent circuit of IPFC is shown in Fig.2.
Conclusion
In this paper, a multi-line FACTS device which is IPFC has been used to examine the
impact of IPFC on ATC enhancement. ATC is calculated using RPF method for
different cases of test system. The results demonstrate the effectiveness and
robustness of IPFC. The results obtained for test system without and with IPFC are compared and observations reveal that ATC is significantly improved with IPFC
under base case as well as line outage case.