10 kV并联电容器谐振分析与对策研究

Resonance Analysis and Countermeasure Research of 10 kV Shunt Capacitor

针对近期发生在云南电网某供电局的一起谐波放大事件,首先对电容器投切前后的实测谐波数据进行对比分析,验证了这是一次由于并联电容器接入后,与系统发生谐波谐振造成谐波电流放大的现象,然后通过仿真建模揭示了并联电容器对谐波电流放大的机理,最后基于谐波谐振理论提出了针对10 kV并联电容器谐波谐振的抑制措施。

Aiming at a recent harmonic amplification event in a power supply bureau of Yunnan Power Grid,the measured harmonic data before and after capacitor switching were compared and analyzed to verify that this is a phenomenon of harmonic current amplification caused by harmonic resonance with the system after the shunt capacitor is connected,and then the mechanism of harmonic current amplification by shunt capacitor was revealed through simulation modeling.Finally,based on the theory of harmonic resonance,the suppression measures for harmonic resonance of 10 kV shunt capacitors were proposed.