Publication: ANALYSIS ON THE IMPACT OF LOAD INCREMENT TO POWER SYSTEM STABILITY AND MITIGATION TECHNIQUES
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Date
2020-08
Authors
NOOR RULHUDA BINTI ISMAIL
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Abstract
Power System Stability is essentially recognized as an important problem for secure
system operation and to prevent major blackouts. The complexity of power systems is
continually increasing because of the growth in interconnection and new technology.
The nature of load characteristics and increased in load demand due to complexity of
the power system is one of the major area in Power System Stability. When the system
is operating at steady state and dynamic stability conditions, it should be operating at
its optimized condition in meeting the customers demand in terms of quantity and
quality with all parameters such as frequency and voltage are within the acceptable
limits and generators are operating at synchronism. With variable load growth in the
system and at the same time to ensure stability of the power system, it is important to
know the impact of load increment to the power system stability. This research work is
to analyse the impact of load increment to power system stability by monitoring
generator performance with respect to generator capability curve and bus voltage with
respect to Voltage Stability Indices (VSI). In addition, injection of PV and installation
Static Var Compensator (SVC) is also included in this research work as mitigation
technique to improve power system instability. IEEE 30 Bus Test System is modelled
and tested using PSSE 34 software and three (3) scenarios are simulated to achieve
the research objectives. The strongest and weakest lines in the system are determined
using two (2) VSI which are Fast Voltage Stability Indices (FVSI) and Line Stability
Factor (LQP). Many papers have been published on voltage stability focused on the
changes of reactive load at the weakest bus. Some of the researcher have discussed the
impact of reactive load increment on selected buses to achieve their research objectives.
However, no works have been published on analysing voltage stability with respect to
active and reactive load increment at all buses, sending and receiving ends of weakest
and strongest lines. Furthermore, there is no research done to study the impact of load
increment to generators performance with respect to generators capability curve. The
relationship between generators performance with respect to generators capability
curve, and voltage stability with respect voltage stability indices is also investigated to
achieve the research objectives.
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Keywords
Power System Stability , generator capability curve , voltage stability