并联电容器装置串联电抗器的电抗率及容量选择

在电力系统中,安装并联电容器组是为了补偿无功功率,提高电压水平.但加装并联电容器组会改变系统谐波阻抗的频率特性,对于工频,系统的感抗Xs一般比并联电容器组容抗Xc小得多,因而不会发生谐振,但当系统中含有谐波分量时,就可能发生有害的串、并联谐振和谐波放大,所以应对并联电容器装置串联电抗器的电抗率及容量进行合理选择.

null

In electric systems, shunt capacitors are used in reactive power compensation and voltage increasing. However, these shunt capacitors will alter the frequency characteristics of system harmonic impedance. Since system inductance Xs under working frequency is much smaller than the capacitive reactance of the shunt capacitors, resonance will not occur. However, when the system contains harmonic components, under certain circumstances, harmful series or parallel resonance may occur and the harmonics may be amplified. Thus, reasonable reactance and capacity values should be chosen.