大规模风电经柔直并网时的系统稳态控制策略

Control Strategy for Large-Scale Wind Power Generation Connnected with Grids by VSC-DC

围绕大规模风电经柔性直流输电(voltage sourced converter based DC transmission,VSC-DC)并网时的系统稳态控制策略展开研究,并将整个系统分成风场内双馈感应式发电机(doubly-fed induction generator,DFIG)系统和风场外VSC-DC系统2个独立部分分别进行控制,提出并分析了风场内DFIG系统的稳态控制策略,包括场站内DFIG的转子侧整流器(rotor side converter,RSC)、网侧逆变器(grid-side converter,GSC)稳态控制策略,以及风场外VSC-DC系统的网侧逆变器(grid side VSC,GSVSC)、风场侧整流器(wind farm VSC,WFVSC)稳态控制策略。最后,2种典型风速工况下的仿真结果证明了所提出的系统级稳态控制策略非常有效。

This paper mainly discusses the steady-state control strategy for the large-scale wind power generation system connected with public, grids by the voltage source converter based DC transmission （VSC-DC） system, which is divided into two parts- the doubly- fed induction generator （ DFIG ） system in the wind farm and the VSC-DC system outside the wind farm. First, the steady-state control strategy for the DFIG system, whieh contains the rotor side converter （RSC）control and the, grid side converter （（;SC）control, is described. Second, the steadv-state control strategy for the VSC-DC system, mainly in- eluding the grid-side VSC （GSVSC）control and the wind farm- side VSC （WFVSC）control, is proposed. Through the simulation of two typieal wind speed conditions, it is shown that this control strategy can deliver the wind energy of the wind farm steadily.