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Robust Signals for the TCSC Oscillation Damping Controllers of the Brazilian North-South Interconnection Considering Multiple Power Flow Scenarios and External Disturbances

2007; Institute of Electrical and Electronics Engineers; Linguagem: Inglês

10.1109/pes.2007.385683

2693-7891

Diego C. Savelli, Paulo César Pellanda, N. Martins, N.J.P. Macedo, Adriano A. R. Barbosa, G. Luz,

Power Systems Fault Detection

The POD signals implemented in the existing thyristor controlled series compensators (TCSCs) of the Brazilian north-south (NS) interconnection are solely intended to damp the low-frequency NS oscillation mode. These signals are derived from the modulus of the active power flow in the NS line that is phase-lagged at the frequency of the NS mode and experience relatively large excursions following exogenous disturbances. This paper attempts deriving the POD signal from the same variable but with a different polarity and employing phase-lead compensation. A notch filter is also used to further reduce the adverse transients in the POD control loop, lowering the risk of TCSC saturation. The described results relate to a large-scale model for the year 1999, considering seventeen power flow scenarios and used by a multi-utility task force involved, at the time, in the planning studies of this interconnection.