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Scheduling of pumped-storage units at Taiwan Power Company (TPC) is investigated in this work. In addition to economic considerations, oscillatory stability of the system as affected by the operation of pumped-storage units is of major concern. To achieve a secure as well as economical dispatching schedule for the pumped-storage units, differential dynamic programming is first employed to reach a preliminary schedule in which total fuel cost of the thermal units over the study period is minimized. Oscillatory stability analysis of the system under the preliminary schedule is then performed by computing the eigenvalues and eigenvectors for all electromechanical modes. Sensitivities of the eigenvalues for the poorly-damped inter-area mode with respect to individual generator outputs are evaluated. Then a systematic approach based on linear programming is presented to refine the preliminary schedule in order to improve the damping for the inter-area mode. The effectiveness of the proposed approach is demonstrated by short term operational planning of Taiwan power system. keyword: power system operational planning, hydro scheduling, pumped-storage unit, oscillatory stability, low frequency oscillations, linear programming

Investigates whether the L-arginine/nitric oxide pathway is involved in the neurotransmission of paraventricular nucleus of hypothalamus activation-induced penile erection in the rat. Cannulation of the femoral artery; Measurement of systemic and mean arterial pressure; Measurement of intracavernous pressure.