电力系统运行与控制作业Word文件下载.docx
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3)、PV节点母线电压水平控制调节对无功电源设备输出功率的影响。
解:
IEEE-30BUSSYSTEM结构如下:
选取的计算软件为MATLAB;
通过matpower3.0.0工具包进行计算;
在MATLAB的控制命令界面下输入runpf(case_ieee30)回车得到的潮流计算结果如下:
Newtonsmethodpowerflowconvergedin2iterations.Convergedin0.00seconds=SystemSummary=Howmany?
Howmuch?
P(MW)Q(MVAr)-Buses30TotalGenCapacity900.2-102.0to188.0Generators6On-lineCapacity900.2-102.0to188.0CommittedGens6Generation(actual)301.0133.9Loads21Load283.4126.2Fixed21Fixed283.4126.2Dispatchable0Dispatchable-0.0of-0.0-0.0Shunts2Shunt(inj)-0.025.3Branches41Losses(I2*Z)17.5667.69Transformers4BranchCharging(inj)-34.7Inter-ties0TotalInter-tieFlow0.00.0Areas1MinimumMaximum-VoltageMagnitude0.992p.u.bus301.082p.u.bus11VoltageAngle-17.64degbus300.00degbus1PLosses(I2*R)-5.21MWline1-2QLosses(I2*X)-15.61MVArline1-2=BusData=BusVoltageGenerationLoad#Mag(pu)Ang(deg)P(MW)Q(MVAr)P(MW)Q(MVAr)-11.0600.000260.96-20.42-21.045-5.37840.0056.0721.7012.7031.021-7.529-2.401.2041.012-9.279-7.601.6051.010-14.1490.0035.6694.2019.0061.011-11.055-71.003-12.852-22.8010.9081.010-11.7970.0036.1130.0030.0091.051-14.098-101.045-15.688-5.802.00111.082-14.0980.0016.06-121.057-14.933-11.207.50131.071-14.9330.0010.45-141.043-15.825-6.201.60151.038-15.916-8.202.50161.045-15.515-3.501.80171.040-15.850-9.005.80181.028-16.530-3.200.90191.026-16.704-9.503.40201.030-16.507-2.200.70211.033-16.131-17.5011.20221.034-16.116-231.027-16.307-3.201.60241.022-16.483-8.706.70251.018-16.055-261.000-16.474-3.502.30271.024-15.530-281.007-11.677-291.004-16.759-2.400.90300.992-17.642-10.601.90-Total:
300.96133.93283.40126.20=BranchData=BrnchFromToFromBusInjectionToBusInjectionLoss(I2*Z)#BusBusP(MW)Q(MVAr)P(MW)Q(MVAr)P(MW)Q(MVAr)-112173.31-24.70-168.0934.475.21315.6121387.654.28-84.542.653.10811.3632443.654.75-42.63-5.541.0183.1043482.14-3.85-81.295.440.8562.4652582.362.78-79.425.172.94312.3662660.381.37-58.430.581.9465.9074672.13-15.91-71.5017.190.6322.20857-14.7811.4914.95-13.130.1690.4396738.13-2.78-37.752.230.3811.17106829.56-7.20-29.466.660.1080.38116927.72-8.09-27.729.720.0001.621261015.840.19-15.841.100.0001.2813911-0.00-15.600.0016.060.0000.461491027.725.88-27.72-5.080.0000.801541244.1914.41-44.19-9.720.0004.691612130.00-10.32-0.0010.450.0000.131712147.862.40-7.78-2.250.0740.1518121517.896.79-17.67-6.360.2170.431912167.243.35-7.19-3.240.0540.112014151.580.65-1.58-0.640.0060.012116173.691.44-3.68-1.410.0080.032215186.021.60-5.98-1.520.0390.082318192.780.62-2.77-0.610.0050.01241920-6.73-2.796.742.830.0170.032510209.033.71-8.94-3.530.0820.182610175.334.43-5.32-4.390.0140.0427102115.7910.01-15.67-9.770.1110.242810227.624.60-7.57-4.490.0530.11292122-1.83-1.431.831.430.0010.003015235.042.91-5.00-2.840.0310.063122245.743.06-5.69-2.990.0460.073223241.801.24-1.80-1.230.0060.01332425-1.212.011.22-2.000.0100.023425263.542.37-3.50-2.300.0450.07352527-4.76-0.374.790.420.0240.0536282718.075.04-18.07-3.750.0001.293727296.191.67-6.10-1.510.0860.163827307.091.66-6.93-1.360.1620.313929303.700.61-3.67-0.540.0340.0640828-0.54-0.540.55-3.800.0020.014162818.670.11-18.62-1.230.0580.20-Total:
17.55767.691.负荷功率的变化对负荷节点电压水平的影响:
负荷功率的变化对负荷节点电压水平的影响:
有功功率变化对节点电压的影响:
由图知7#为负荷节点(PQ节点),以7号节点为例:
当7号节点的有功功率为22.8MVA,无功功率为10.9MVA,7#节点的潮流计算结果如下:
BusVoltageGenerationLoad#Mag(pu)Ang(deg)P(MW)Q(MVAr)P(MW)Q(MVAr)-71.003-12.852-22.8010.90有功功率增加:
当7号节点的有功功率为24.8MVA,无功功率为10.9MVA,7#节点的潮流计算结果如下:
BusVoltageGenerationLoad#Mag(pu)Ang(deg)P(MW)Q(MVAr)P(MW)Q(MVAr)-71.002-13.019-24.8010.90结论:
负荷有功功率增大,节点电压降低;
节点电压相角减小。
有功功率减少:
当7号节点的有功功率为24.8MVA,无功功率为18MVA,7#节点的潮流计算结果如下:
BusVoltageGenerationLoad#Mag(pu)Ang(deg)P(MW)Q(MVAr)P(MW)Q(MVAr)-71.004-12.453-18.0010.90结论:
负荷有功功率减少,节点电压升高;
节点电压相角增大。
无功功率增加:
当7号节点的有功功率为22.8MVA,无功功率为12MVA,7#节点的潮流计算结果如下:
BusVoltageGenerationLoad#Mag(pu)Ang(deg)P(MW)Q(MVAr)P(MW)Q(MVAr)-71.002-12.842-22.8012.00结论:
负荷无功功率增大,节点电压降低;
无功功率减少:
当7号节点的有功功率为22.8MVA,无功功率为18MVA,7#节点的潮流计算结果如下:
BusVoltageGenerationLoad#Mag(pu)Ang(deg)P(MW)Q(MVAr)P(MW)Q(MVAr)-71.004-12.879-22.808.00结论:
负荷无功功率减少,节点电压升高;
2.变压器变比的调节对两端电压水平的影响:
变压器变比的调节对两端电压水平的影响:
查找case_ieee30.m文件,6与9节点之间存在变压器,当6与9之间的变压器变比为:
0.978时,6号节点和9号节点潮流计算结果如下:
BusVoltageGenerationLoad#Mag(pu)Ang(deg)P(MW)Q(MVAr)P(MW)Q(MVAr)-61.011-11.055-91.051-14.098-增大变压器变比:
当6与9之间的变压器变比为1时:
BusVoltageGenerationLoad#Ma