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针对大规模风电场接入电网带来的电压无功问题,给出了双馈风电机组的功率关系,总结了双馈风电机组固有无功调节容量研究成果。分析了双馈风电机组的功角特性及静态稳定约束对双馈风电机组无功调节容量的影响,简述了电网导则可能对双馈风电机组无功调节容量的约束。在此基础之上,分析了综合考虑机组自身运行约束、静态稳定裕度和电网导则约束的双馈风电机组无功调节容量。利用实际机组参数进行仿真,结果表明,综合考虑多种约束条件能够使双馈风电机组的无功调节容量分析更接近实际情况,为双馈风电机组参与风电接入地区电网电压的调节提供理论依据。
In view of voltage reactive power brought by large-scale wind farms connected to the power grid, the power relations of doubly fed wind turbines are given, and the research results of inherent reactive power regulation of doubly-fed wind turbines are summarized. The influence of power angle characteristic and static stability constraint of doubly-fed wind turbine generator on the reactive power regulation capacity of doubly-fed wind turbines is analyzed. The constraints that the power grid guidance may have on the reactive power regulation of doubly-fed wind turbine generators are briefly discussed. On this basis, the reactive power regulation capacity of doubly-fed wind turbines considering the operation constraint of unit, static stability margin and grid guidance is analyzed. The actual unit parameters are used to simulate. The results show that the comprehensive consideration of various constraints can make the analysis of reactive power capacity of doubly-fed wind turbine closer to the actual situation and provide the theoretical basis for the doubly-fed wind turbine to participate in regulating the grid voltage of wind power access area .