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1、三、编写程序并运行各个节点电压标幺值分别为节点12345678910电压1.051.051.03380.96941.00940.91291.01660.94321.02710.9922由此观察到节点4、6、8、10的电压都较正常范围偏低,因此调节变压器分接头和发电厂电压,最终得到合理结果,调整和结果如下:调节方法:调节方法电厂1电压电厂2电压分接头1分接头2分接头3分接头4未调整1.051.050.9090.9090.9090.909调整后1.051.0750.8860.8640.8860.909调节结果:节点电压12345678910未调整1.051.051.03380.96941.0094
2、0.91291.01660.94321.02710.9922调整后1.051.0751.03571.02191.01631.00921.03101.00751.04831.0142此时,节点4、6、8、10的电压均在题目允许的范围内,对线路损耗进行分析,统计调整后各个支路的有功损耗的标幺值,记录于下表:功率损耗未调整调整后(1,3)支路0.003530.00314(1,5)支路0.008970.00638(1,7)支路0.019490.01277(2,9)支路0.050830.04423(5,7)支路0.009220.00855(7,9)支路0.032610.03067(3,4)支路0.001
3、740.00174(5,6)支路0.003740.00441(7,8)支路0.003350.00334(9,10)支路0.000790.00076总损耗0.134270.11599由此可以看出,随着变压器分接头的调低以及发电厂电压的升高,有功损耗逐渐增大,符合实际情况,而最终调节使得电压在规定范围内时,有功损耗减少了1.828MW,相对于实际损耗小很多,可以认为是合理的。具体的潮流分布如下:各条支路的首端功率Si各条支路的末端功率SjS(1,3)=40.488+j14.853S(3,1)=-40.174-j30.25S(1,5)=7.552+j45.292S(5,1)=-6.914-j50.9
4、03S(1,7)=-46.441+j43.49S(7,1)=47.718-j48.501S(2,9)=200+j9.057S(9,2)=-195.58-j11.941S(5,7)=-53.527+j0.566S(7,5)=54.382-j3.704S(7,9)=-162.43+j6.176S(9,7)=165.5-j9.102S(3,4)=40.174+j30.25S(4,3)=-40-j25S(5,6)=60.441+j50.337S(6,5)=-60-j37S(7,8)=60.334+j46.029S(8,7)=-60-j37S(9,10)=30.076+j21.043S(10,9)=-3
5、0-j19各节点的功率S为(节点号从小到大排列):Columns1through50.01599+j1.036352+j0.090570+j0-0.40000-j0.250000+j0Columns6through10-0.60000-j0.370000+j0-0.60000-j0.370000+j0-0.30000-j0.19000四、4个变电所负荷同时以2%的比例增大由于变电所负荷变大,所以各个变电所负荷标幺值变为:变电所1S=0.408+j0.253变电所2S=0.612+j0.379变电所3S=0.612+j0.379变电所4S=0.306+j0.190调节方法:调节方法电厂1电压电厂
6、2电压分接头1分接头2分接头3分接头4未调整1.051.050.9090.9090.9090.909调整后1.051.0750.8860.8640.8660.909调节结果:节点电压12345678910未调整1.051.051.03350.96811.00860.90991.0160.94091.02680.9917调整后1.051.0751.03531.02051.01521.00431.03031.00441.04791.0136功率损耗未调整调整后(1,3)支路0.003680.00328(1,5)支路0.009210.00673(1,7)支路0.019250.01247(2,9)支路
7、0.050820.04429(5,7)支路0.009110.00848(7,9)支路0.032330.03046(3,4)支路0.001810.00180(5,6)支路0.003880.00464(7,8)支路0.003470.00351(9,10)支路0.000810.00078总损耗0.134370.11644由电压和功率损耗的标幺值可以观察到,电压和有功损耗均符合题目要求,可认为是合理的。具