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采用定子串联阻抗的双馈风电机组低电压主动穿越技术研究

DOI: 10.13334/j.0258-8013.pcsee.2015.12.004, PP. 2943-2951

Keywords: 双馈风电机组,低电压穿越,定子串联阻抗,内模控制器,有源制动

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Abstract:

针对双馈风电机组低电压穿越问题,国内外研究成果主要分为两类:电网电压小值跌落时,通过优化控制策略提高机组低电压运行能力,保证机组不间断运行;电网电压大值跌落时,通过转子并联撬棒(Crowbar)旁路转子变流器,保证机组不脱网,同时,网侧变流器可注入一定无功电流。对于电网电压大值跌落问题,目前采取的穿越技术较为被动,Crowbar投入后,双馈发电机以感应电机/发电机方式运行,需要吸收一定无功,不利于电网电压恢复。针对此问题,提出一种基于定子串联阻抗的低电压主动穿越方案,不仅能保证故障期间双馈风电机组的不间断运行,而且能够通过转子变流器向电网注入接近额定的无功电流,支撑电网电压;通过优化定子串联阻抗值和控制器参数,机组故障运行能力得到大幅提升。

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