南澳多端柔性直流输电示范工程仿真和测试

Simulation and Test of Nan'ao VSC-MTDC Demonstration Project

南澳多端柔性直流输电示范工程(简称南澳柔直工程)是世界上第一个VSC-MTDC工程。对该工程柔直换流器满载运行时谐波和损耗水平进行测试,结果表明柔直换流器产生谐波电流小,对交流电网电压畸变率基本无影响,换流器损耗在额定功率的1%左右。对换流器的有功和无功阶跃、风电场通过纯直流系统并网、系统功率反转和三端功率升降进行了仿真研究,结果表明南澳柔直工程构成了灵活可控的三端直流输电网络,能将南澳岛风电场的风电接入电网并保持自身和相关电网稳定运行。

Nan＇ao VSC-MTDC Demonstration Project is the first VSC-MTDC project in the world. The harmonic and loss have been tested when the converters were of full load, the results show that the harmonic current generated by the VSC converters is so small that it is almost of no distortion in AC voltage, and the converter loss is about 1% of rated capacity. Simulations of the active and reactive power step, grid integration of wind farm by a pure DC system, power inversion of the system, and power up and down of the three terminals are carried out. The results show that Nan＇ao VSC-MTDC project results in a HVDC system with three terminals, which can integrate the wind power of the wind farms at Nan＇ao island into the power grid and keep itself and the related grid in stable operation.