直流电网潮流控制与短路控制复合装置

Unified Device of Power Flow Control and Short Circuit Control for DC Power Grid

随着高压直流输电的发展和直流电网结构的日益复杂,直流系统的潮流调节和短路故障问题日益突出。基于多端柔性直流输电系统的潮流控制和短路故障抑制技术,文中提出了一种用于直流电网的兼具直流潮流控制和短路故障切除的多功能复用装置。该装置不仅能实现潮流在线路之间的灵活控制,而且能够实现对故障电流上升速率的限制和对短路故障的切除。对一个加装了该复合装置的三端直流环网进行研究,分析该复合装置的工作原理、控制策略及运行特性。最后,在PLECS软件中搭建了仿真模型,验证了该装置及其控制策略的可行性和有效性。

With the rapid development of high voltage direct current (HVDC)transmission and the increasing complex structure of DC power grid,DC power-flow regulation and short circuit fault interruption have become more and more prominent.Based on the technology of interline direct current power flow controller and fault suppression,this paper proposes a novel unified device of power flow controlling circuit breaker (PFCCB)for DC power grid,which combines power flow controller and DC circuit breaker.The PFCCB can not only adjust the power flow flexibly between two lines,but also curb the short current and cut off the fault line in time.Its operating principles,control strategy and performance are analyzed in a three-terminal meshed grid with PFCCB.Simulation is also made with PLECS software and the results validate the feasibility and effectiveness of PFCCB.