三广直流工程融冰运行方式仿真试验

三广直流工程的直流线路必须考虑合适的防冰对策。文章借助于实时数字仿真器与直流控制保护仿真系统模拟了三广直流工程的各种运行方式，提出了采用一极功率正送、另一极功率反送的融冰运行方式。该融冰运行方式不需要改动主接线方式，也无需修改直流控制保护系统的软硬件系统。仿真结果表明，该运行方式可在与交流系统交换有功功率较小的情况下达到融冰的效果，符合冬季调度方式的要求。

Simulation Test of Ice-Melting Operation Mode for HVDC Power Transmission Project from the Three Gorges Hydropower Station to Guangdong

For the HVDC power transmission project from the Three Gorges Hydropower Station to Guangdong an appropriate ice-melting countermeasure should be considered. By means of real-time digital simulator and DC control and protection simulation system, various operating modes of this HVDC project are simulated, and it is proposed for ice-melting operating mode, i.e., one pole runs at normal power transmission direction mode and the other pole runs at reverse power transmission direction mode. In such an ice-melting operating mode it is neither necessary to alter the connection way of main circuit, and nor to change the software and hard ware of control and protection system for DC power transmission. Simulation results show that with this ice-melting operating mode the ice-melting effect can be achieved under the lower active power exchanged with AC system, so it conforms to the requirement of dispatching mode in winter.