电气化铁路接入电力系统220kV和110kV供电电压等级的研究

Research on power supply with 220 kV and 110 kV in traction substations of electric railways

讨论了电气化铁路牵引变电所采用220 kV和110 kV两种不同供电方案下的优缺点。先从理论上分析比较两种供电电压等级下电气化铁路注入系统的谐波和负序引起的电能质量,其中主要计算比较注入公共连接点母线谐波电流、电压总畸变率、三相电压不平衡度和电压波动等几个重要的电能质量指标。再结合工程实例,通过技术经济的综合分析和比较,选择性价比高的方案。为今后电气化铁路的建设提供借鉴经验的同时推动相关工程的工程化发展。

Advantage and disadvantage of power supply scheme with 220kV and 110kV for traction substations of electric railways are discussed in the paper. At first, electrical energy quality is calculated and analyzed theoretically from two aspects of harmonic and negative-sequence, including harmonic current injected to point of common coupling（PCC）,total harmonic distortion of voltage （THDu） of PCC , three-phase voltage unbalance factor of PCC and voltage fluctuation of PCC, etc. And then, combined with the project case, superior scheme with low cost and high reliability is suggested by technical analysis and economic comparison. This may offer useful experience and promote the development of relevant projects.