By Mohamad Fauzi Zaini,
Power System Modelling Research
(PhD Candidate, UBD|IBM Centre)
What is Power Swing?
Power swing event is a disturbance in the power system which can cause fluctuations and oscillations of electrical parameters such as power, current, voltage, etc. Relay protection system in the network will see this event as fault and unnecessary cascading transmission lines tripping will happen.
Why does it need to be modelled and prevented?
It is desirable for the system to trip lines during fault and/or unstable power swing event which lead to loss of synchronism which can damage electrical components such as transformers and generators.
But during stable power swing event where equilibrium of the system is maintained it is preferable for the protection system not to trip the lines or more accurately to block the operation of the relay. Hence, it is important to have an accurate model to detect this phenomena and consecutively to prevent it from causing the costly line-tripping and damage to electrical equipments.
About this research
The aim and goal is to develop novel technologies and solutions for the identification and prevention of power swing within the Government’s Department of Electrical Services (DES) electrical network.
Past swing events will be analysed and solutions for detection and damping of power swings in the grids will be developed, as well as preventive measures to avoid unwanted tripping of transmission line due to power swing.
Detailed DES power system will be modelled based on existing data and different scenarios of power swing cases will be simulated. The behaviour of electrical parameters during swing events will be analysed and detection algorithm will be developed.
Extensive case studies will be made to differentiate the power swing from the normal fault and accordingly, power swing relay settings for DES network will be determined.
So far, there is no power swing scheme that is able to accurately detect the occurrence of power swing event in the system. One of the research aim is to develop a power swing detection method that has a higher accuracy margin than the existing power swing schemes.
As the population increases the power system becomes bigger and more complex. With the increased connection and electrical components in the system, power swing phenomena become more frequent. It is hoped that this research project could help detect and prevent the power swing event from occurring and damaging components within the system.
Using the modelled DES system, further simulations and studies for cost optimisation and loss minimisation can be done in order to make the power system run effectively with reduced fuel consumption and added reliability and stability which in turns improve the grid’s security and robustness.
Studies on the network protection system and the integration of the renewables such as wind turbines and/or photovoltaic solar panel systems are other possible research areas that can be looked into.
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