【作者】 易东；

【导师】 李群湛；

【作者基本信息】 西南交通大学 ， 电力系统及其自动化， 2003， 硕士

【摘要】 青藏铁路地处青藏高原，电源稀缺，使铁路35kV贯通线不得不采取超长距离输电，使得本来较为简单的供电问题变得相当复杂，论文就是基于此问题进行研究，对高原铁路超长距离贯通线供电进行理论分析，提出解决问题的理论措施，供设计单位参考，以保证高原铁路贯通线的安全可靠供电。 论文共包括五部分。 绪论中提出了35kV超长距离供电线路可能出现的问题：空载或轻载时由于分布电容作用，线路末端电压升高；带负荷运行时，线路电压损失较大，线路首末端电压相角差变大，首端导线发热，线路电阻中消耗的功率大，供电不经济。 第2章根据文献列出长线路的理论计算公式。 第3章对长线空载时的运行情况进行了仿真研究，35kV超长线路空载时线路电压按余弦规律分布，末端电压最高；线路具有较大的充电电流；电源电抗使线路末端电压进一步升高。同时对并联电抗器的作用进行了分析，电抗器能够有效的限制空载电压升高。 第4章分析了在不同负荷条件下线路的运行情况，提出解决电压下降问题的措施，包括并联电容，串联电容，动态无功补偿装置，以及采用太阳能发电，风能发电等备用措施，并对这些措施进行了仿真研究和论述。特别是对串联电容补偿进行了研究，指出由于铁路负荷的特殊性，串联电容的效果并不明显。 第5章提出超长线供电可能出现的内部过电压：空载时末端电压升高，不对称短路引起的过电压，间歇电弧过电压，空载线路分闸，合闸过电压等。更多还原

【Abstract】 The QingHai-Tibet railway lies in the QingHai-Tibet altiplano and the all-line 35kV power line must be very long because of there only a little or no power source, so the power supply became very difficult and complexity. The paper’s studying is based on this question. The paper analyzes the power supply and puts forward some useful ways in theories to the designer for reference in order to guarantee the reliability and security of the power supply.The paper has five parts.In the introduction, brings forward the questions that would appear in the very long 35kV power transmission lines. The questions are : a) the voltage of the tail end of the line would be higher than that of the first end of the line because of the distributing capacitor of the line when no load or only a little load on the line; b)when there has some loading on the line, the voltage would drop too much, the voltage phase difference between the first and the tail end of the line is very large, the first end of the line would be very heat and it would be diseconomy because power loss in the resistance of the line is very large.In the second part, lines out the calculating formulas for the very long power line.In the 3rd part, simulates the non-loading line and draws out the conclusions that when there is no load on the long line, the voltage of the tail end is the highest and the voltage in the line distributes in line with the cosine order; there has a very large charging current in the line and the voltage of the tail end would be higher after taking into account the power source reactance. Also the part studies the effect of the parallel inductor and points out the parallel inductor would limit the overvoltage of the non-loading line.In the 4th part, analyzes the running of the line when it has different loadings and puts forward the measures to compensate the voltage drop. These measures are: the parallel capacitor, the series capacitor, the dynamic reactive compensation and solar or wind generator and so on. Especially the paper points out that because of the particularity of railway power loads , the effect of seies capacitor is very little.In the 5th part , lines out the inner overvoltage would appear on the very long power line. These voltage are: the overvoltage of non-loading line; the asymmetry fault overvoltage; the intermission arc grounding overvoltage; energization overvoltage and break off overvoltage on the non-loading line.更多还原