Performance Analysis and Optimization of High-Voltage Dedicated Line Continuous Power Supply System Based on Hybrid Lines
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摘要:
针对高压专线贯通供电系统中电缆应用引发的工频过电压与高成本问题，提出基于混合线路的优化配置方案. 首先，利用二端口网络理论构建系统空载等效电路模型，结合混合线路分布参数特性，理论推导沿线电压与空载环流分布规律；其次，通过端口等效建立系统π型等值电路，并采用网络分裂算法构建多负荷统一潮流模型，提出系统等值阻抗与牵引网极限供电距离计算方法，定量评估混合线路的供电能力；进一步，以全寿命周期成本最优为目标，优化电缆与架空线安装比例. 仿真结果表明，“电缆 + 架空线”方案可有效抑制工频过电压，降低空载电流至纯电缆方案的1/3，同时保留电缆长距离供电优势（极限供电距离达95 km），较传统方案节省投资约510万元.
Abstract:To address the power frequency overvoltage and high costs caused by cable applications in high-voltage dedicated line continuous power supply systems, an optimized hybrid line configuration scheme was proposed. First, a no-load equivalent circuit model was established using two-port network theory, and the distribution laws of voltage and no-load circulating currents along the hybrid lines were theoretically derived by incorporating the distributed parameters of the lines. Second, a π-type equivalent circuit of the system was constructed through port equivalence, and a unified multi-load power flow model was developed using a network splitting algorithm. A calculation method for system equivalent impedance and the traction network’s maximum supply distance was proposed to quantitatively evaluate the power supply capability of hybrid lines. Furthermore, to minimize the total life cycle cost, the proportion of cable and overhead line installations was optimized. Simulation results demonstrate that the “cable + overhead line” scheme effectively suppresses power frequency overvoltage, reduces no-load current to one-third of that in pure cable configurations, and retains the long-distance supply advantage of cables (maximum supply distance of 95 km), saving approximately 5.1 million yuan in investment compared to conventional schemes.
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Key words:
- co-phase traction power supply /
- hybrid line /
- capacitance effect /
- flow calculation /
- optimization
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图 1 基于混合线路的高压专线贯通供电系统结构
Figure 1. High-voltage dedicated line continuous power supply system based on hybrid lines
图 3 贯通高压输电网分布参数电路模型
Figure 3. Distributed parameter circuit model of high-voltage continuous transmission network
图 5 空载的高压专线贯通供电系统等效电路
Figure 5. Equivalent circuit of no-load high-voltage dedicated line continuous power supply system
图 7 高压专线贯通供电系统 π 型等值电路
Figure 7. π-type equivalent circuit of high-voltage dedicated line continuous power supply system
图 9 空载工况下贯通高压输电网沿线分布电压
Figure 9. Voltage distribution along high-voltage continuous transmission network under no-load conditions
图 11 D1和D2区间的供电距离关系
Figure 11. Relationship between power supply distances for D1 and D2
表 1 仿真参数设置
Table 1. Setting of simulation parameters
设备 参数 值 电力电缆
YJLW02-127/220-400自阻抗/（Ω•km−1） 0.1106 + j0.7232 互阻抗/（Ω•km−1） 0.0493 + j0.4952 对地电容/（F•km−1） 1.2926 ×10−7架空线
LGJ-400/35自阻抗/（Ω•km−1） 0.1413 + j0.7157 互阻抗/（Ω•km−1） 0.0493 + j0.3222 对地电容/（F•km−1） 0.0698 ×10−7互电容/（F•km−1） 0.0118 ×10−7等效接触线 自阻抗/（Ω•km−1） 0.1170 + j0.5810 对地电容/（F•km−1） 1.1430 ×10−7等效钢轨 自阻抗/（Ω•km−1） 0.0910 + j0.465对地电容/（F•km−1） 1.1430 ×10−7等效接触线-等效
钢轨互阻抗/（Ω•km−1） 0.0493 + j0.3390 互电容/（nF•km−1） − 4.6600 
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表 2 空载状态下的电流大小
Table 2. Current magnitude under no-load conditions
A 空载电流 ITT1 ITT2 ITT3 电缆 + 架空线 8.02 5.94 2.09 架空线 + 电缆 29.77 17.34 12.44 纯电缆 24.62 12.81 11.83 纯架空线 2.91 1.52 1.39
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