10kV串联电抗器4次谐波放大分析

Analysis of Four Times Harmonic Amplification of 10 kV Series Reactor

大量非线性负荷的接入会造成系统半波不对称,此时系统可能会产生偶次谐波和直流分量,当偶次谐波含量过大时就会对电力系统的正常运行造成严重危害。在分析偶次谐波出现的条件以及谐波放大的原理基础上以某公司电容器组烧毁事件为例进行分析,在7%电抗率条件下算出各次谐波阻抗,发现4次谐波电流被放大,通过等值电路法分析了放大原因,并给出合理的解决方案,为以后电抗率的合理选择提供了参考。

The connection of a large number of nonlinear loads will result in the half-wave asymmetry of the system,and even harmonics and DC components may be generated in the system.When the even harmonic content is too large,it will cause serious harm to the normal operation of the power system.Based on the analysis of the conditions of even harmonics and the principle of harmonic amplification,the case of capacitor bank burning in a company is analyzed.Under the condition of 7%reactance,each harmonic impedance is calculated,and it is found that the fourth harmonic current is amplified,the reason of amplification is analyzed by equivalent circuit method,and a reasonable solution is given,which provides a reference for the reasonable selection of reactance in the future.