柔性直流输电技术发展及其应用

Development of Flexible HVDC and Its Application

相控换流器高压直流输电(LCC-HVDC)技术的固有缺陷催生了电压源控制高压直流输电(VSC-HVDC),国内称之为柔性直流输电(HVDC Flexible)。具备了快速独立地控制与交流系统交换有功功率和无功功率功能,能有效控制公共连接点的电压、潮流反转方便灵活、事故后快速恢复、提高交流系统电压稳定性、功角稳定性,加之设计施工方便灵活,施工周期短,电磁场污染和噪声污染小,没有油污染的特点,使得柔性直流适合用于海上钻井平台或孤岛供电、弱交流节点处的交流电网非同步互联、新能源电源的分散连接、提高配电网电能质量等方面,发展前景好。

The inherent disadvantages of LCC-HVDC improved the development of VSC-HVDC,which is also called flexible HVDC in China.With lots of advantages,such as fast and independent control on the active and reactive power exchange with AC system,effective control of the voltage on the bust,flexible and convenient flow reversal,fast recovery after breakdown,stability improving of the AC system,stable power angle,convenient and flexible design and construction,short construction period,low level of electromagnetic and noise pollution,no oil pollution,flexibility HVDC has been particularly suitable for power supply of island or drilling platform on the sea,the non-synchronous interconnection at the weak exchange node of AC power grid,dispersed connection of new energy power sources and power quality improving of distribution network.