Abstract
The
inertia constant of a system describes the initial, transient, frequency
behaviour of that system when subjected to a real power disturbance.
Therefore, the inertia constant of a system can be a useful tool when
investigating the frequency stability of a system. The use of the swing
equation is a viable method for estimating the inertia constant, if a
measurement system that can provide time stamped measurements of the
frequency and power dynamics during a disturbance is available. An
example of such a system is a Wide Area Monitoring system that is
capable of monitoring the frequency at all, or a select set, of
generation sites. A method for estimating the inertia constant based on
this data is developed and demonstrated for two simple networks. This
demonstration is performed using computer simulations in the DigSILENT
PowerFactory software package. The inertia constant estimation method is
implemented in the MATLAB environment.
Index Terms
Computer simulations; electric power generation; frequency measurement;
frequency stability; inertia constant estimation method; power system
measurement; power system transients
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