Power flow control in DC transmission grids using mechanical and semiconductor based DC/DC devices
Power flow control in DC transmission grids using mechanical and semiconductor based DC/DC devices
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DOI：
10.1049/cp.2012.1972
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发表时间：
2012
期刊：
影响因子：
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通讯作者：
D. Jovcic;M. Hajian;H. Zhang;G. Asplund
中科院分区：
文献类型：
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作者：
D. Jovcic;M. Hajian;H. Zhang;G. Asplund
可以通过具有N个单独的AC/DC转换器的DC电网中的N-1条不同的DC线路/电缆来控制DC功率流。大型网状直流电网可以有更多的直流线路，并且由于我们无法控制所有线路/电缆的功率，因此可能会导致过载。本文提出了两种通过直流线路/电缆进行直流潮流控制的方法。第一种方法涉及使用与直流线路/电缆串联嵌入的额外电阻器，并通过基于机械或半导体的直流断路器进行切换。另一种方法包括在直流线路/电缆的一端安装DC/DC转换器，以达到直流潮流控制的目的。结果表明，第一种方法更适合短传输线/电缆，而第二种方法则适用于具有高额定电流和较高压降的长传输线/电缆。 PSCAD 仿真结果展示了用于两个大型 370kV 直流电网之间直流潮流控制的半桥双向直流斩波器。 （6页）
DC power flow can be controlled though N-1 different DC lines/cables in a DC grid having N individual AC/DC converters. A large meshed DC grid can have more DC lines, and since we can not control power in all lines/cables, an overload may result. In this paper, two methods are proposed for DC power flow control through DC lines/cables. The first method involves using extra resistors embedded in series with DC lines/cables and switched by mechanical or semiconductor based DC circuit breakers. The other method includes installing DC/DC converter at one of the DC line/cable ends with the purpose of DC power flow control. It is shown that the first approach suits better for a short transmission line/cable, while the second one is proposed for a long transmission line/cable with high rated current and higher voltage drop. PSCAD simulation results are presented for a half bridge bidirectional DC chopper employed for DC power flow control between two large 370kV DC grids. (6 pages)