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Ultra low frequency oscillation (ULFO) is significantly threatening the powersystem stability. Its unstable mechanism is mostly studied via generalizeddamping torque analysis method (GDTA). However, the analysis still adopts theframework established for low frequency oscillation. Hence, this letterproposes a GDTA approach in the jerk space for ULFO. A multi-informationvariable is constructed to transform the system into a new state space, whereit is found that the jerk dynamics of the turbine-generator cascaded system isa second-order differential equation. Benefiting from this characteristic, wepropose a new form for GDTA using jerk dynamics, which is established in thefrequency-frequency acceleration phase space. Then, analytical expressions ofall damping torque are provided. Finally, test results verified the proposedtheoretical results. The negative damping mechanism is revealed, and parameteradjustment measures are concluded.

Generalized Damping Torque Analysis of Ultra-Low Frequency Oscillation in the Jerk Space