双馈风机与电网机电扭振互作用可能性分析

为了研究大规模双馈式感应发电机风电场并网是否能引发双馈风电机组与交流电网间的机电扭振互作用问题,分析了双馈风电机组与交流电网间机电扭振互作用的机理,并基于双馈风电机组轴系特性对其与交流电网之间发生机电扭振互作用的可能性进行了探讨.分析得出由于交流输电系统串补度的限制,双馈风电机组与交流电网之间发生机电扭振互作用的条件较难满足,由此引发次同步谐振的可能性很小.通过时域仿真算例验证了结论的合理性.

Analysis on possibility of electromachenic torsional interaction between DFIG and power grid

In order to study whether large scale wind farm of doubly fed induction generators （DFIG） can cause the electromachenic torsional interaction between the DFIG and AC power grid, the mechanism of electromachenic torsional interaction between DFIG and AC power grid was analyzed. Based on the shaft characteristics of DFIG, the possibility of electromachenic torsional interaction between DFIG and AC power grid was investigated. The results reveal that due to the limitation of series compensation degree of AC transmission system, the generation condition for the electromachenic torsional interaction between DFIG and AC power grid can hardly be satisfied, and thus, the generation possibility of sub synchronous resonance is small. Finally, the rationality of conclusions is verified by the time domain simulation case analysis