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谐振引起的牵引变电所无功动补投切故障分析
曹建设
作者单位
曹建设 中铁第一勘察设计院集团有限公司 电气化处陕西 西安 710043 
摘要:
某牵引变电所TCR型动态无功补偿装置在进行设备投运时,发生2次谐波放大现象,导致牵引变电所继电保护装置频繁跳闸。结合SVC投切试验现象,对投切故障进行了分析。在工频频率下,SVC滤波支路的容抗远大于系统感抗,不会产生并联谐振。但对谐波频率而言,系统感抗大幅增加而滤波支路容抗大幅减小。当电力系统短路容量过小时,系统阻抗和滤波支路参数构成并联谐振,导致TCR产生的2次谐波被放大,从而引起SVC投切时牵引变电所断路器跳闸。
关键词:  动态无功补偿  滤波支路  谐波  并联谐振  短路容量
DOI:
分类号:
基金项目:
Analysis of dynamic reactive compensator switching fault induced by resonance
CAO Jianshe
Abstract:
When the TCR-type dynamic reactive compensator of a traction substation is put into operation,the second harmonic is magnified,which causes the frequent tripping of its protections. Combined with the SVC tests,the switching fault is analyzed. At power frequency,since the capacitive reactance of SVC’s filter circuit is much larger than system inductance,the parallel resonant could not happen. But at the harmonic frequency,the system inductance increases greatly and the reactance of the filter circuit reduces greatly. When the short-circuit capacity of power system is too small,the system impedance and the filter circuit parameter may form a parallel resonance,resulting in the magnified second harmonic and then the breaker tripping.
Key words:  dynamic reactive compensation  filter branch  harmonics  parallel resonant  short circuit capacity

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