102年 - 102 國立中山大學_碩士班招生考試_電機系(丁組)：電力工程#109115

試卷資訊

選擇題 (0)

申論題 (8)

(a)Calculate the parameters and draw the equivalent circuit of this transformer referred to the low- voltage side of the transformer. (15%)

(b)Calculate the voltage regulation at rated conditions with Power Factor (PF) 1.0. (5%)

(a)The total system loads are 260 MW at a frequency of 60 Hz. Calculate the no-load frequencies of each generator. (10%)

(b)Calculate the new system frequency if the system load rises to 290 MW. (10%)

3. The fuel cost function in $/h for four units of a plant are Assume that all four units operate economically to meet the total plant load of 700MW, find the incremental cost of the plant and the required output of each unit (20%).

4. The following equations are the real power and reactive power injected into a bus: Calculate the derivatives of for Newton-Raphson Load FIow.(25%)

(a) Give the per-unit swing equation for this unit. (5%)

(b) Calculate the power angle 4 cycles after a short circuit causes p_e = 0.(10%)