特高压直流输电直流侧高频干扰及滤波器型式

Researchs on High Order Harmonics Interference and Filters at DC Side of UHVDC Transmission System

为解决特高压直流输电系统在直流线路和接地极线路上产生大量的高频谐波,以特高压直流输电系统每极2组12脉动换流器串联的换流器为例,深入分析了特高压直流输电换流站产生电力线载波干扰和无线电干扰的机理;探讨了换流站直流侧高频谐波的规范要求,针对直流极线和接地极线上PLC/RI滤波器的多种组合方式,采用谐波分析软件HAP计算了直流极线端部和接地极线端部的总PLC及总RI干扰水平;提出了抑制特高压直流输电直流侧高频干扰的滤波器配置方案。

The communication of power line carrier （PLC） in the frequency of 20～500kHz in the ultra-high voltage direct current （UHVDC） transmission line with ±800V rated voltage and the radio communication range from 500kHz～20MHz near the converter substation and along the ultra-high voltage direct current transmission line are interfered strongly by high order harmonics from converters and direct current transmission line and neutral line of ultra-high voltage direct current transmission system. It＇s a virtual way to reduce power line carrier interference （PLCI） and radio interference （RI） to install PLC/RI filters at the terminals of the polar line and neutral line at the direct current side of converter substation. The power line carrier interference and radio interference from the ultrahigh voltage direct current transmission system with two series of 12 pulse converters in a pole line are produced by the chopping of valve voltage of converters and the discharging of electric corona and insulators. The limitation values for power line carrier interference and radio interference from the converter substation of ultra-high voltage direct current transmission system are analyzed in the paper. After calculating the total power line carrier interference and radio interference at the terminal of the direct current pole line and neutral line in the circumstance of PLC/RI filter schemes with a harmonic analysis program, a economical and practical PLC/RI filter scheme for limiting power line carrier interference and radio interference at the direct current side of ultra-high voltage direct current converter substation is produced.