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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。
In the HVDC system, the interference of the power line carrier and the radio communication is mainly caused by the interference noise caused by the abrupt change of the valve voltage during the triggering of the converter valve. The interference generated is propagated in two ways: firstly, it is transmitted to the switch through the converter transformer Field and transmission lines; the second is dipole radiation. In the Sanhu DC Project, the suppression measures taken according to the calculation results of the interference level of the converter station are as follows: The DC polar line PLC / RI filter adopts a set of double tuned filters and is mainly responsible for radio filtering; the DC neutral bus adopts 1 set The 2 mH series reactor and a 7 nF shunt capacitor cancel the tuning device; the AC side is conventionally configured to handle the interference filtering of radio and carrier communications. This configuration not only meets the index requirements, but also saves the equipment.