基于LCL滤波器的中高压链式STATCOM参数设计

Parameter design of cascade multilevel STATCOM in medium voltage based on LCL filter

目前LCL滤波器的研究主要集中于整流器、有源滤波器APF和新能源并网发电方面,在中高压链式STATCOM方面研究较少。建立基于LCL滤波器的中高压链式STATCOM的数学模型,其次研究中高压链式STATCOM的各级直流侧电容和纹波之间的变化关系,设计出容量2.8 MVar电压6 kV链式STATCOM主电路的参数值,基于LCL滤波器各参数变化与电流纹波抑制和装置效率之间的限制条件,在此基础上提出在满足电流纹波抑制效果、电压损耗和装置效率3个要求的前提下,设计出滤波效果最优的LCL滤波器的参数值。最后通过计算机仿真与实验装置验证LCL滤波器参数设计方案的正确性。

Current research on LCL filter is largely concentrated on rectifier and new energy incorporated electricity generation, while few researches are conducted on medium voltage cascade multilevel STATCOM. This study has developed a mathematical model of medium voltage cascade multilevel STATCOM based on LCL filter. Also, the variable relationships among capacitors voltage on DC link and ripple wave have been investigated. The main circuit parameters of cascade STATCOM（6 kV,±2.8 MVar） were designed. Based on the restricted conditions among parametric variation of STATCOM, wave current suppression and plant efficiency, an optimal parameter design for improving filtering effect was obtained. By analyzing the results from the emulation experiment and the actual device experiment, the design scheme is proven to be valid and feasible.