无功功率补偿容量的计算.docx

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1、3.7.2无功功率补偿容量的计算     字体 [大]   [中]   [小]电容器组额定容量的确定：单相接线的电容器，其容量按下式计算：(3-1)三相三角形接线的电容器组，其容量按下式计算：(3-2)三相星形接线的电容器组，其容量按下式计算：(3-3)以上各式中CX——单相等效电容(μF);　　　　　UX——相电压(kV);　　　　　UX-X——线电压(kV);　　　　　ω——角频率(Hz)。若已知最大负荷月的平均负荷P(kW)以及补偿前后的功率因数cosᵠ1、cosᵠ2，则需补偿的无功功率可按下式计算：(3-4)补偿后的功率因数cosᵠ2的确定应适当。当cosᵠ2大于

2、0.95到cosᵠ2=1时电容量的增长很快。将功率因数由0.95提高到1和由0.7提高到0.9所需补偿的容量应近似相等。从经济上看，将功率因数提高到1是不合适的。为计算方便，可直接从表3-18查得每千瓦有功功率，由补偿前的功率因数cosᵠ1达到补偿后的功率因数cosᵠ2所需补偿的无功功率，然后乘以有功功率的千瓦数，即可得到所需补偿的无功功率。表3-18每1千瓦有功功率所需无功功率补偿量/(kvar/kW)补偿前cos1补偿后cos20.800.820.840.860.880.900.920.940.960.981.00.400.410.421.5421.4731.41

3、21.5961.5271.4661.6471.5781.5171.6991.6301.5691.7531.6841.6231.8071.7381.6771.8661.7971.7361.9291.8601.7992.0031.9341.8732.0902.0211.9602.2932.2242.1630.430.440.450.460.470.480.490.501.3521.2881.2341.1801.1251.0761.0360.9811.4061.3421.2881.2341.1791.1301.0901.0351.4571.3931.3391.2851.2301

4、.1811.1411.0861.5091.4451.3911.3771.2821.2331.1931.1381.5631.4991.4451.3911.3361.2871.2471.1921.6171.5531.4991.4451.3901.3411.3011.2461.6761.6121.5581.5041.4591.4001.3601.3051.7391.6751.6211.5671.5221.4631.4231.3681.8131.7491.6951.6411.5961.5371.4971.4421.9001.8361.7821.7281.6831.6241.584

5、1.5292.1032.0391.9851.9311.8761.8271.7871.732续表补偿前cos1补偿后cos20.800.820.840.860.880.900.920.940.960.981.00.510.520.530.540.550.560.570.580.590.600.610.620.630.640.650.660.670.680.690.700.710.720.730.740.750.760.770.780.790.9390.8900.8490.8080.7660.7280.6910.6550.6180.5830.5490.5150.4810.

6、4500.4370.3880.3570.3270.2970.2700.2410.2120.1850.1570.1310.1030.0780.0520.0240.9930.9440.9030.8620.8000.7820.7450.7090.6720.6370.6030.5690.5350.5040.4770.4420.4110.3810.3510.3240.2950.2660.2390.2110.1850.1570.1320.1060.0781.0440.9950.9510.9130.8710.8330.7960.7600.7230.6880.6540.6200.5860

7、.5550.5220.4930.4620.4320.4020.3750.3460.3170.2900.2620.2360.2080.1830.1570.1291.1061.0471.0060.9650.9230.8850.8480.8120.7750.7400.7060.6720.6380.6070.5740.5450.5140.4840.4540.4270.3980.3690.3420.3140.2880.2600.2350.2090.1811.1601.1011.0601.0190.9770.9390.9020.8660.