U=1 G Ti T2 Stoere 1004 As shown in the figure above, the parameters of a single machine infinite bus system are: the ge

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U 1 G Ti T2 Stoere 1004 As Shown In The Figure Above The Parameters Of A Single Machine Infinite Bus System Are The Ge 1 (87.32 KiB) Viewed 42 times

U=1 G Ti T2 Stoere 1004 As shown in the figure above, the parameters of a single machine infinite bus system are: the generator Tj = 8.18, x'd = 0.295, X2 = 0.432; the transformers Xt1 = 0.138, Xr2 = 0.122, the zero sequence reactance is equal to the positive sequence reactance; the single line xui = 0.486. Xlo = 0.972. In the normal state Po = 1, cosy = 0.98. Calculate the critical clearing time in the case of different fault with Modified Euler method: (1) three phase short circuit, (2) single phase-to-earth short circuit, (3) phase-phase short circuit, (4) double phase-to-earth short circuit. Method: 1. The basic idea With the interval of 0.001s test the clearing time and judge the stability through observing the power angle trend until the critical clearing time is found. The algorithm is improved Euler method with the step of 0.001s. Note that acceleration and deceleration process need to be calculated respectively. 2. Calculation process Step 1. Calculate the parameters in the normal state (prefault), such as EP 80 Step 2. Set different fault type and calculate the data during the fault, such as Xil Pul- Step 3. Calculate the data after the fault (postfault), such as Xill, Por Step 4. Set the clearing time. Step 5. Calculate the value of w and 8 during the fault. Step 6. Calculate the value of w and 8 after the fault. Step 7. Judge the stability through observing the power angle trend. If the system is stable increase the clearing time. On the contrary decrease the clearing time. Repeat Step 5 and Step 6 in order to find the critical clearing time.