基于等效电感的高压线路高频融冰方法研究

Research on High-Frequency Ice Melting Method for High-Voltage LinesBased on Equivalent Inductance

现有高频融冰方法的高频电源必须安装在融冰线路的中点,而线路的中点大多位于偏远地区,设备安装难,运行维护不便,因此提出了基于等效电感的高压线路高频融冰方法。该方法将常规电抗器作为等效电感替代高频电源一侧的长距离输电线路,融冰电源输出高频电流,产生的焦耳热集中于导线表面,实现融冰。高频电源安装在变电站内,安装、使用方便,成本低,可及时响应电网指令。以220 kV及500 kV电压等级的100 km输电线路为参考对象,设计了高频电源的输出参数。参数计算结果表明,高频电源性能指标在合理范围内,可实现在线融冰。

The high-frequency power supply of the existing high-frequency ice melting method must be installed at the midpoint of the ice melting line.However,most of the midpoints of the line are located in remote areas,which is difficult to install equipment and inconvenient to operate and maintain,so a high-frequency ice melting method for high-voltage lines based on equivalent inductance is proposed.In this method,conventional reactors are used as equivalent inductors to replace long-distance transmission lines on the side of high-frequency power supply,and the ice-melting power supply outputs high-frequency current,and the Joule heat generated is concentrated on the surface of the wire to achieve ice melting.The high-frequency power supply is installed in the substation,which has the advantages of convenient installation and use,low cost,and timely response to power grid commands.Taking 100 km transmission lines with voltage levels of 220 kV and 500 kV as reference objects,the output parameters of high-frequency power sources are designed.The parameter calculation results indicate that the performance indicators of the high-frequency power supply are within a reasonable range,and online ice melting can be achieved.