Calculation of Urban Rail AC/DC Power Supply with Intermittent Duty of Inverter Feedback Devices
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摘要:
逆变回馈装置在实际运行中采用间歇工作制，当采用供电计算确定逆变回馈装置的选址和容量设计时，必须考虑逆变回馈装置的工作特性模型. 为此，提出了一种考虑逆变回馈装置间歇工作制的城市轨道交直流供电计算算法. 该算法基于逆变回馈装置的功率提出了逆变回馈装置负荷过程的动态调整策略，并实现其状态切换；从主变电所统计整条线路的全日能耗，分析不同逆变回馈装置启动电压、整流机组空载电压和列车发车对数对城市轨道供电系统能耗的影响. 本文算法与实际工程中的逆变回馈装置负荷过程更加吻合. 以实际地铁工程为例对线路进行了仿真，仿真结果表明：逆变回馈装置的启动电压会影响系统的节能效果；投入逆变回馈装置并选取合适的启动电压对供电系统具有明显的节能效果，相比不安装逆变回馈装置的系统可节省12.23%的能耗；当整流机组空载电压较高，或当发车对数稀少时，适当降低逆变回馈装置的启动电压可以获得更佳的节能效果.
Abstract:In practical applications, inverter feedback devices work in intermittent duty, and its working characteristic model must be considered when determining its location and capacity design in the power supply calculation. Thus, an AC/DC alternating iterative power flow calculation algorithm with intermittent duty of inverter feedback devices is proposed for urban rail transit. A power-based dynamic adjustment strategy is proposed to realize state transition in the operation of inverter feedback devices. The full-day energy consumption is calculated for the entire line starting from the main substation, and the influences of the starting voltage of different inverter feedback devices, the no-load voltage of the rectifier unit and the number of train departures affect are analyzed. The whole line of an actual metro project is simulated and the simulation results prove that the proposed algorithm is more consistent with the load process of the inverter feedback devices in actual project. The statistical results show that the starting voltage of the inverter feedback devices will affect the system energy saving, and a proper starting voltage have a significantly favorable effect on the energy saving of the power supply system equipped with inverter feedback devices, which can save 12.23% of the energy consumption compared with the system without inverter feedback devices; when the no-load voltage of the rectifier is high, or when there are few trains, the starting voltage of the inverter feedback device should be reduced accordingly to obtain a better energy saving effect.
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图 2 改进的城市轨道交直流供电计算算法流程
Figure 2. Improved algorithm flow of urban rail AC/DC power supply calculation
图 3 广州地铁某实际线路供电系统简图
Figure 3. Outline of power supply system of an actual Guangzhou metro line
图 4 算法改进前后及实测的逆变回馈装置直流电流
Figure 4. Measured and calculated DC currents of inverter feedback devices by original algorithm and improved one
图 5 算法改进前后及实测的逆变回馈装置占空比
Figure 5. Measured and calculated duty cycles of inverter feedback device by original algorithm and improved one
图 7 Cs = 6.86时，不同Ud0、β情况下的W
Figure 7. W varying under different Ud0 and β at Cs = 6.86
图 8 Cs = 20.00时，不同Ud0、β情况下的W
Figure 8. W varying under different Ud0 and β at Cs = 20.00
图 9 不同Ud0时，情况1下β为βW-min时的W与情况2下的W
Figure 9. With different Ud0, W change in case 1 when β= βW-min and in case 2
表 1 逆变回馈装置工作制
Table 1. Working strategy of inverter feedback devices
工作制 工作制示意图 时间/s In σn Ⅰ型 
ton=30,
T=120Ir/2 1/4 Ⅱ型 
ton=30,
T=90Ir/3 1/9 Ⅲ型 
ton=10 + 30,
T=180Ir/3 1/9 
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表 2 不同Cs下的βW-min及W
Table 2. βW-min and W under different Cs
Ud0/V Cs = 6.86 Cs = 20.00 βW-min W/(MW•h) βW-min W/(MW•h) 1600 0.316 132.058 0.421 246.874 1620 0.294 132.145 0.412 246.837 1640 0.267 132.329 0.400 246.849 1660 0.231 132.590 0.385 247.083 1680 0.18 132.944 0.364 247.695 1700 0.111 133.641 0.333 249.013 1720 0.143 134.573 0.286 251.226 1740 0.100 135.607 0.200 254.402
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表 3 不同Cs下的系统节能率
Table 3. Energy saving rate of system under different Cs
% Ud0/V Cs=6.86 Cs=20.00 Ud0/V Cs=6.86 Cs=20.00 1600 8.02 10.64 1680 9.73 12.99 1620 8.46 11.21 1700 10.24 13.62 1640 8.80 11.83 1720 10.75 14.11 1660 9.41 12.46 1740 11.36 15.06
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