低电压穿越控制下双馈风电机组短路电流特性与计算方法
发布时间：2018-07-13 15:53
【摘要】：双馈风电机组(DFIG)的规模化应用使得电力系统的故障特性发生了变化,极大制约了电力系统继电保护的实施。针对现有研究未计及低电压穿越(LVRT)措施对DFIG故障特性的影响问题,对低电压穿越控制下DFIG的短路电流进行研究,重点考虑DFIG无功功率输出通过改变机端电压对机组故障输出特性的影响。着眼于DFIG定转子绕组反应、变换器LVRT控制的相互耦合,通过构建LVRT控制下的DFIG矢量模型,导出了LVRT控制启动前和启动后的DFIG短路电流表达式,从无功功率输出和LVRT控制启动延时两个方面分析LVRT控制对DFIG短路电流的影响,建立LVRT控制启动前和启动后的DFIG故障等效模型,提出考虑LVRT控制影响的DFIG并网系统短路电流的计算方法。
[Abstract]:The large-scale application of doubly-fed wind turbine (DFIG) makes the fault characteristics of power system change greatly, which greatly restricts the implementation of power system relay protection. Considering the influence of low voltage traversing (LVRT) measures on the fault characteristics of DFIG, the short circuit current of DFIG under low voltage traversing control is studied. The influence of DFIG reactive power output on the fault output characteristics of the unit by changing the terminal voltage is considered. Focusing on the windings reaction of DFIG stator and rotor, and the mutual coupling of LVRT control, the DFIG vector model under LVRT control is constructed, and the short circuit current expressions of DFIG before and after the start of LVRT control are derived. The influence of LVRT control on DFIG short circuit current is analyzed from two aspects of reactive power output and LVRT control startup delay. The equivalent model of DFIG fault before and after LVRT control is established. A method for calculating short circuit current of DFIG grid-connected system considering LVRT control is presented.
【作者单位】： 输配电装备及系统安全与新技术国家重点实验室(重庆大学);国网重庆市电力公司电力科学研究院;
【基金】：国家自然科学基金(51407017) 重庆市基础与前沿研究计划(cstc2015jcyj A90016) 中央高校基本科研业务费专项资金(106112015CDJXY150001)资助项目
【分类号】：TM315
[Abstract]:The large-scale application of doubly-fed wind turbine (DFIG) makes the fault characteristics of power system change greatly, which greatly restricts the implementation of power system relay protection. Considering the influence of low voltage traversing (LVRT) measures on the fault characteristics of DFIG, the short circuit current of DFIG under low voltage traversing control is studied. The influence of DFIG reactive power output on the fault output characteristics of the unit by changing the terminal voltage is considered. Focusing on the windings reaction of DFIG stator and rotor, and the mutual coupling of LVRT control, the DFIG vector model under LVRT control is constructed, and the short circuit current expressions of DFIG before and after the start of LVRT control are derived. The influence of LVRT control on DFIG short circuit current is analyzed from two aspects of reactive power output and LVRT control startup delay. The equivalent model of DFIG fault before and after LVRT control is established. A method for calculating short circuit current of DFIG grid-connected system considering LVRT control is presented.
【作者单位】： 输配电装备及系统安全与新技术国家重点实验室(重庆大学);国网重庆市电力公司电力科学研究院;
【基金】：国家自然科学基金(51407017) 重庆市基础与前沿研究计划(cstc2015jcyj A90016) 中央高校基本科研业务费专项资金(106112015CDJXY150001)资助项目
【分类号】：TM315
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