三沪直流工程PLC/RI滤波器型式研究

在高压直流系统中, 对电力载波和无线电通讯的干扰主要是换流器阀在触发期间阀电压的突变造成的干扰噪音, 产生的干扰通过2 种方式传播: 一是通过换流变压器传至开关场和输电线路; 二是偶极辐射。在三沪直流工程中, 根据换流站干扰水平计算结果采取的抑制措施为: 直流极线PLC/RI 滤波器采用1 组双调谐滤波器, 主要负责无线电的滤波; 直流中性母线采取1 台2 mH 串联电抗器和1 台7 nF 并联电容器, 取消了调谐装置; 交流侧按传统设计配置, 负责无线电和载波通讯的干扰滤波。此配置既满足了指标要求, 又节省了设备。

Study on Three Gorge-Shanghai DC Project PLC/RI Filter Types

In HVDC systems,the major sources of power line communication(PLC) and radio communication interferences are noises caused by converter valve voltage break.The interferences propagate in 2 ways: one goes from converter transformer to switchyard and transmission line,the other is through dipole radiation.In Three Gorge-Shanghai project,based on converter station interference level calculation,following suppression measures are taken: a double-tuned filter,which is responsible for radio frequency filtering,is used in DC line PLC/RI filter;DC neutral bus uses a 2 mH series reactor and a 7 nF parallel capacitor,eliminating the tuning device;AC side is configured based on conventional design and is responsible for filtering radio and carrier communications interferences.Such configuration not only meets design requirements,but also requires fewer devices.