ppt

1. Paper Id-379
IEEE International conference on Technological
Advancements in Power and Energy -2021
Paper Title – Contingency Ranking for Voltage in Power
System
Track Name –Power System control And Automation
Author -Fidah Hussian∗, Govind Rai Goyal, Aadesh Kumar
Arya, and Bhanu Pratap Soni
College of Engineering Roorkee, Roorkee, India
Email: fidasheikh151198@gmail.com
Contact no- +917006972101
NAKSHATRA
Technical Paper/Poster Presentation Event

2. Time-Limits
Overview:
. Introduction
. Block Diagram
. Proposed Control Algorithm
. Simulation Result
. Conclusion
. References

3. Guidelines
=
Objective
. Continuous assessment of voltage stability is vital to ensure a
secure operation of the power system.
. This paper deals with the voltage stability index for an outage
of a power transmission line.
. The voltage stability index is determined for all possible outage
conditions in each line of the system.
.The effectiveness of the proposed methodology is demonstrated
on IEEE 6-bus power system.
The simulation results show that the severity of a line outage
can be indicated by contingency ranking analysis.

4. INTRODUCTION
MODERN power system is a complex interconnected network having
multiple utilities of different nature at generation, transmission, and
distribution ends.
. This diverse nature of the devices makes the operation of power system
more complex as compared with earlier days. This complexity is also
increasing due to exponential increase in population and escalating load
demands.
. Excess flow of reactive power produces heat, that may cause damage to the
system and it may also result into increased transmission losses. Such
conditions demand the implementation of some techniques to test and
diagnose voltage breakdown prior to its occurrence in bus bars or lines
. A standard IEEE 6-bus system is being tested for this new indexing. For each
load condition and all possible line outages, the stability indices are
evaluated.

5. SINGLE LINE DIAGRAM OF SYSTEM CONSIDER
FOR STUDY

6. 1. Title Slide (1 slide)
Institution and/or Address
VOLTAGE STABILITY INDEX (VSI)
To show the voltage stability condition, the proposed voltage stability index (VSI) is
used. The threshold limit of VSI is set at unity. Values of line stability indices that
approach unity indicate that the system is approaching its stability limit of voltage.
Proposed VSI Formulation
The VSI at the receiving end of a two-bus system is derived from the voltage
quadratic equation. The line diagram of the general two-bus system .

8. Proposed Control Algorithm
To evaluate the contingency ranking for line outages, the
following stages are implemented using MATLAB.
• Using the Newton-Raphson method for the base case,
run the load flow software.
• Simulate all the selected outages on transmission lines.
• For any line outage in the system, calculate the VSI
value.
• Transmission lines are ranked in descending order based
on VSI.
• Extract the line index that is nearest to or greater than
the unity.

10. Simulation Result
The ”contingency ranking” is evaluated for all the mentioned above cases. The
computation is performed by taking outages of all the lines one by one, for each
different case.
. A contingency table has been produced by the simulation results acquired from
selected outages on the transmission lines. The outage that culminated in a serious
state of stability is high ranked.
. The effect of a line breakdown on the voltage stability of the system could be
determined from the contingency ranking table. This table demonstrates the value of
the maximum index and the line number for each line outage condition. [!] For
example, referring to case-1 in Table II; if the line number one is disrupted, the
proposed index is estimated for all the lines present in system. The result obtained
shows that the stability index is highest for line number 10 i.e. 2.07.
. It shows that the line number 10 is most sensitive to the outage in line number 1. For
all the line outages, this kind of result has been shown in each row of the table. It can
be seen from the row 2 and 3 of the table that outage in line 2 and line 3 resulted in
non-convergence of load flow mentioned by ‘LFDNC’ (load flow does not converge).

12. Conclusion
In this paper new index of the voltage stability named VSI
have been defined.
. The proposed index can be used in the power system to
identify the critical transmission lines. If the VSI of a
transmission line is near or greater than unity, the line will be
considered as critical. In deciding the contingency ranking that
is based on the line outage in the system, this index is used.
.A step by step algorithm has been developed and
implemented on IEEE 6-bus power system in MATLAB for
different cases. Simulation results helped to find the line under
voltage instability condition in each contingency condition. In
order to avoid the occurrence of voltage failure in the system,
the contingency ranking may help the operating engineer take
corrective steps.

13. . Reference
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