电力系统运行与保护课程设计实验指导书
Right click on a bus and choose Fault? to perform a fault analysis at that bus Right click on a line and choose Fault? to perform a fault analysis at that point on the line
2．All four of these options will open the Fault Analysis dialog. If you opened the dialog by right-clicking on a bus or line, the fault information on that bus or line will already be filled in. If you selected the Fault Analysis? Option from the Options/Tools menu or the Fault button, the information about the location of the fault will need to be provided.
3．Now, we will set up the fault. In the Fault Analysis dialog, select In-Line Fault for Fault Location and Double Line-to-Ground for Fault Type. Select Bus 1 for the Near Bus and Bus 3 for the Far Bus, and enter 50 for the Location %. To see the results in amps select Amps for the Current Units. The Fault Analysis dialog should now look like the one below:
4．Enter the fault impedance. Go to the Fault Options tab in the Fault Analysis dialog, and enter the R and X values at the top. Since our fault has zero-impedance, we can leave these at their default of zero.
5．To enter mutual impedance values go to the Options tab in the Fault Analysis dialog. We will assume that our system uses the default values for mutual impedances. To enter mutual impedance values, right-click in the table. The Mutual Impedance Record will appear. Enter the appropriate data here. Alternatively, mutual impedance values can be loaded from PowerWorld auxiliary files or in PTI format by clicking the Load button. The data may be saved in PowerWorld auxiliary
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电力系统运行与保护课程设计实验指导书
format by clicking the save button.
6．Click the Calculate button in the lower right corner of the Fault Analysis dialog.
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电力系统运行与保护课程设计实验指导书
7．The results that we are interested in are the currents in lines 1-2 and 2-3. Click on the Lines tab to see this data. Since this is a lossless system, the From and To currents are equal for each line. These are the results:
Fault Data - Lines From Number 1 1 1 2 4 From Name ONE ONE ONE TWO FaultPt To To Circuit 1 Phase Cur A From 119.69 0 53.01 70.57 52.98 Phase Cur B From 266.18 0 717.42 233.02 800.3 Phase Cur C From 431.55 0 864.95 320.28 1088.38 Number Name 2 3 4 3 3 TWO THREE 1 FaultPt 1 THREE 1 THREE 1 Phase Cur A From A相电流 Phase Cur B From B相电流 Phase Cur C From C相电流
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电力系统运行与保护课程设计实验指导书
第六章 电力系统运行与设计
第一部分：
1.阅读说明书和软件的帮助，练习软件的使用。
2.按图1.1建立一个五母线系统，各母线的基准电压设为13.8kV.发电机母线1作为松弛节点，并且母线电压标幺值设为1.05pu。在母线4上加装无功补偿装置，
设置补偿电容数值为0.5Mvar。母线4上的发电机功率输出设为1MW，母线电压标
幺值设为1.05pu，其余母线连接负载，系统视在功率标么值1.0pu代表1.0MVA。接着完成下述任务：
a）用Power world绘制该系统的单线图。 b）生成该系统的电力潮流文件
c）观察各母线的电压和功角，发电机的输出功率，传输线的电力潮流等数据记录在表格里。
图 1.1 五母线系统图 表1.1：母线参数表
Bus Num 1 2 3 4 5 PU Volt Volt（kV） Ange（Deg） Load MW Load Mvar Gen MW Gen Mvar 28
电力系统运行与保护课程设计实验指导书
表1.2：线路状态参数
Num Line 1 2 3 4 5 1 - 2 1 - 5 2 - 3 4 - 2 5 - 4 Satuts closed closed closed closed closed Xfrmr MW from Mvar from MVA from Lim MVA ％of Lim 第二部分
第二部分中，在第一部分的系统图中，添加两条传输线：Line1-4参数为
0.2＋j0.4pu和Line3-4参数为0.2＋j0.4pu，并且对各传输线的负荷极限做出规定如表2.1所示，系统各种故障状态如表2.2所示。
表2.1 传输线负荷极限
Line 1－2 2－3 2－4 3－4 4－5 1－5 1－4 表 2.2故障状态
Number 1 2 3 4 29
Limit（MVA） 1 1 1 0.5 0.5 1 0.5 Contingency Base－case 1－2 open 1－4 open 1－5 open