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中文摘要：
风电场的电气特性必须符合新的大型风电场并网标准和要求。按照这些要求，风电场受到的约束仅仅是当时的风力条件，应该能在传统发电厂的水平上完成控制任务。例如，在电网降低输电容量时（如主干电网器件替换或检修），风电场的所有风力机可以运行，但功率水平降低。风电场也必须能参与局部平衡控制（二次调频）。主要基于具有低电压穿越能力的双馈风机，在联络线的风电场侧和网侧都采用距离保护，增加保护的可靠性，并建立保护模型，并将其与风机模型相结合进行研究。
英文摘要：
The electrical characteristics of wind farms must comply with the new integration standards and requirements of large-scale wind farm.According to these requirements , the wind farm is constrained by the wind conditions just at that moment , and it should be able to complete the control tasks on the level of the conventional power plants .For example , when the grid reduces the transmission capacity （ such as the device replacement or repair of main power grid ） , all the wind turbines of wind farms can still be in the operation , but the power level is low .And wind farms also must be able to participate in local balance control （secondary FM）.Based on doubly-fed induction generator with low voltage ride through （LVRT） capability, the dis-tance protection is adopted in the wind farm side and the grid side of the link line in order to increase the reliability of protec -tion.Then the protection model is established and studied combining with the induction generator model .
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