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dissipation energy, steady point identification Abstract.Low frequency oscillation has been a serious threat to security and stability of power grid, and how to locate the disturbance source accurately is an important issue to suppress low frequency oscillation. The existing location method has poor adaptability to oscillation with time-varying steady points because of the limitations in the derivation of location criterion. This paper presents a disturbance source location method of low frequency oscillation with a better versatility. Firstly, the mechanism and response characteristics of oscillation with time-varying steady points is analyzed, then the energy function of a specific construction form is decomposed into state energy, reciprocation energy and dissipation energy by mathematical derivation. The flow of dissipation energy shows the origin and destination of disturbance energy, so it can be used to identify the specific location of disturbance source. A recognition method for electrical quantities' steady points is also proposed based on cubic spline interpolation in order to meet the needs of energy calculation. The calculation results of examples show that the derivation and analysis of energy structure in this paper is correct, and it is able to locate the disturbance source accurately according to the dissipation energy.

Disturbance Source Location Method of Low Frequency Oscillation With Time-varying Steady Points