适用于电气化铁道供电系统的新型振荡闭锁装置原理的研究

本文针对电气化铁道牵引负荷的特点,总结了牵引负荷影响电力系统距离保护振荡闭锁装置产生误动的几个主要因素。分析了牵引负荷中谐波对振荡闭锁装置的影响,提出了一种新型闭锁原理及其实现的模拟系统方法和数字系统方法,同时在TRS—80微机上对后者进行了仿真试验。结果表明:新型闭锁装置具有较好的滤波特性和抑制涌流能力,能够满足电力系统对距离保护振荡闭锁装置的要求。

Research on the New Principle of Power Swing Blocking Devices Adapted for Electrified Railway Supply Systems

Considering the characteristics of electrified railway supply systems,several important factors which cause the maloperation of power swing blocking devices used in distance protection systems are summarized.One of these factors,which is produced by unbalanced harmonic sources,espccially by traction loads,has been analyzed in details.A new blocking principle is proposed,with which analog and digital blocking systems are carefully designed.The simulation investigation carried out in TRS-80 microcomputers has proved that with the new blocking principle the maloperation of power swing blocking devices can be avoided,and that the new digital blocking system is more acceptable.