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The Influence Research of Large-scale Wind Power on Out-of-step Oscillation of The Northwest China Power Grid

机译:大规模风电对西北地区电网远程振荡的影响研究

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Based on theoretical research of the influence of Doubly Fed Induction Generator (DFIG) on equivalent system, it is offered that the oscillation is affected by the characteristic of wind turbine. The qualitative analysis shows that the influence of reactive power voltage control mode and protection mode of wind turbine to oscillation mode are unignorable. It is studied that the influence of DFIG active power output to oscillation splitting strategies. Grid simulation result shows that the wind turbine is likely to drop out from the grid if the wind turbines without Low Voltage Ride Through (LVRT) feature. As a result, oscillation will become more obvious, or even new out-of-step oscillation will emerge after wind turbines generator tripping. Reactive power and voltage control has little effect on the oscillation. It is found that the splitting strategies will be affected by the variation of DFIG active power output during a relative long time period compared to the transient oscillation process. The reason behind is that the power flow distribution and voltage level of the system will change due to the variation of DFIG active power output which will finally influence the splitting strategies in some extent.
机译:基于双馈诱导发电机(DFIG)对等效系统影响的理论研究,提供了振荡受风力涡轮机特性的影响。定性分析表明,风力涡轮机与振荡模式的无功电压控制模式和保护模式的影响是不可抗触的。研究了DFIG有源电力输出对振动分裂策略的影响。网格仿真结果表明,如果风力涡轮机通过(LVRT)特征没有低电压乘坐的风力涡轮机,风力涡轮机可能会从网格中掉出。结果,在风力涡轮机发生器跳闸后,振荡将变得更加明显,甚至新的静步振荡将出现。无功电压和电压控制对振荡几乎没有影响。发现分裂策略将受到与瞬态振荡过程相比相对长的时间段期间DFIG有源电力输出的变化的影响。背后的原因是,由于DFIG有源电力输出的变化,系统的电流分布和电压电平将在一定程度上最终影响分裂策略。

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