浅谈系统谐波与并联电容器装置间的相互影响

并联电容器装置由电容器组、串联电抗器及其他配套器件组成,其电路模型主结构为电容和电感的串联回路。由于电容元件和电感元件的阻抗均随频率变化而变化,所以当电力系统中接入并联电容器装置后就会对系统中谐波的潮流分布产生一定影响,同时,电容器装置本身也受到系统谐波的影响。通过电路的基本理论分析了不同参数的电容器装置与系统谐波之间的相互影响。通过分析可知系统或并联电容器装置参数的变化可能会对系统谐波起到放大、抑制或滤除等不同影响,所以,我们在设计并联电容器装置时应充分考虑系统参数以及接入点的电能质量,并在全面评估后合理选择参数。

Discussion on Mutual Influence between Harmonic and Shunt Capacitor Device

Shunt capacitor devices are composed by capacitor bank,series reactor and other supporting devices.The main structure of its circuit model is series loop of capacitance and inductance.The impedance of capacitor cell and inductance components varies with frequency,thus exists a definite influence on harmonic flow when the shunt capacitor device is connected in the electric system.Meanwhile,the capacitor device itself is also affected by the harmonic in the system.This article analyzes the mutual influence between system harmonic and capacitor device of difference parameter by way of basic theory of electric circuit.It is known through analysis that the change of parameter of system or shunt capacitor bank has different influence such as enlargement,suppression or filtering etc on system harmonic.So we should consider fully about the quality of electric energy of switch on point and system parameter when we design the shunt capacitor device,and choose the right parameter after a comprehensive assessment.