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Locating Source of Oscillation using Mode Shape and Oscillating Energy Flow Techniques

In this paper, two different techniques of locating the source of oscillation source are compared viz. Mode shape method and Oscillating energy flow method. Mode shape for each generator is calculated using the measurement signal, generator speed. The mode shapes are calculated corresponding to inter-area mode which is filtered out using wavelet synchro squeezing technique. The generator which has a leading phase angle for that mode is said to be responsible for creating disturbance in the system. Also, oscillating energy flow using measurements at generator buses are calculated for each generator. The oscillating energy flow technique is related to damping provided by the generator in the system. The generator which has negative damping is considered to be the source of oscillation in the system. Mode shape technique is a time window based technique and gives a more correct result for the large time window. However, the oscillating energy flow method can be calculated at each time instants. Another challenge with mode shape technique in locating the source of disturbance is to comment on damping contribution from a generator if a particular generator is not participating in that mode. Measurements from two different systems Kundur system and New England system are used to identify the source of oscillation in the system.