考虑不同合闸方式下的多组背靠背电容器合闸波形特征分析

Analysis of the Waveform Characteristics of Multiple Groups of Back-to-back Capacitors Considering Different Switched Modes

多组背靠背电容器的安装形式是电力系统中一种常见的电容器结构,当一组电容器合闸时,与其背靠背安装的电容器之间,存在电荷的充放电过程,其暂态响应与单台电容器合闸有着显著的差异。文章建立电容器合闸的等效简化电路,分别对中性点接地和不接地系统,三相多组背靠背电容器合闸引起的暂态波形数据进行研究,建立典型暂态特征,进而呈现多组背靠背电容器与单台电容器在不同合闸方式(同步合闸和间隔合闸)下暂态特征存在的差异。理论分析、仿真和模拟实验结果均验证了暂态特征的准确性,为三相多组背靠背电容器合闸暂态波形的检测和进一步研究提供理论基础。

The installation of multiple groups of back-to-back capacitors is a common capacitor structure in the power system.When a group of capacitors is switched,there is a charging process,and their transient is significantly different from a single capacitor.In this paper,the equivalent simplified circuit of switching capacitor is established.Based on the study of transient waveform data caused by three-phase multiple groups of back-to-back capacitors switching in neutral grounded and ungrounded systems respectively,typical transient characteristics are established.Then,the differences between the transient characteristics of multiple groups of back-to-back capacitors and single capacitor under different switching modes(synchronously and asynchronously)are presented.The results of theoretical analysis,simulation and simulation experiments confirm the accuracy of transient characteristics.The study results provide the theory foundation for the detection and further study of the transient waveform of three-phase multiple groups of back-to-back capacitors switching.