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电网技术  2015 

双馈风电机组低电压穿越参考功率优化整定

DOI: 10.13335/j.1000-3673.pst.2015.10.014, PP. 2772-2779

Keywords: 双馈风电机组,低电压穿越,crowbar保护,超速,机电暂态

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Abstract:

在综合双馈风电机组已有低电压穿越方法的基础上,提出一种双馈风电机组低电压穿越参考功率优化整定方法。在详细分析电压跌落引发crowbar保护动作后的双馈风电机组机电暂态过程的基础上,根据转子运动方程,推导了电压跌落持续期间双馈感应发电机不发生超速脱网的条件,给出了双馈感应发电机参考功率的整定计算公式。基于PSCAD/EMTDCV4.2.0仿真软件,搭建了某型号1.5MW双馈风电机组的低电压穿越仿真模型。仿真结果表明,在电压跌落持续期间,所提出的参考功率整定方法既能减轻双馈感应发电机转速增加程度,又能使双馈感应发电机向电网发出一定无功功率,进而验证了所提方法的有效性。

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