YNd和Yd变压器接线组别对发电机非全相运行电流的影响

发布时间：2018-01-19 03:06

本文关键词： 非全相发电机定子电流变压器接线组别　出处：《电机与控制学报》2017年04期 　论文类型：期刊论文

【摘要】：发电机非全相运行时定子电流中会出现负序分量,如对负序电流影响判断不尽合理,可能导致重大的电网系统事故,为了准确分析YNd和Yd变压器接线组别对发电机非全相运行电流的影响,首先给出了YNd和Yd接线的各组别变压器高低压侧电压和电流的相量关系。然后采用解析法分别对YNd和Yd接线变压器高压侧一相和两相断开的物理过程进行研究,建立了故障后发电机定子三相电流的数学模型,给出了定子三相电流的相量图,揭示出变压器采用这两种连接情况下,其高压侧一相和两相断开后发电机定子电流的变化规律。最后以一台1 407 MVA汽轮发电机为例,仿真计算了YNd1接线变压器高压侧A相断开情况下发电机定子三相电流,计算结果与解析法分析结果相一致,验证了分析的正确性。
[Abstract]:When the generator is not in full phase operation, there will be negative sequence components in the stator current. If the influence of the negative sequence current is not reasonable, it may lead to serious power system accidents. In order to accurately analyze the influence of YNd and Yd transformer wiring groups on the generator non-phase operating current. Firstly, the phasor relation of voltage and current of high and low voltage side of YNd and Yd connection transformers is given. Then the physical overpass of one phase and two phase disconnection of high voltage side and two phase of YNd and Yd connection transformers are analyzed by analytical method, respectively. Cheng studied. The mathematical model of three-phase current of generator stator after fault is established, the phasor diagram of stator three-phase current is given, and it is revealed that the transformer adopts these two kinds of connection. The variation of stator current of the generator after one phase and two phase disconnection of the high voltage side is studied. Finally, a 1 407 MVA turbogenerator is taken as an example. The three-phase current of generator stator under the condition of A phase disconnection of high-voltage side of YNd1 connection transformer is simulated and calculated. The calculated results are in agreement with the analytical results, and the correctness of the analysis is verified.
【作者单位】：哈尔滨理工大学电气与电子工程学院;
【基金】：国家自然科学基金(51407050) 黑龙江省博士后基金(LBH-Z15033) 国家重大科技专项(2009ZX06004-013-04-01)
【分类号】：TM31;TM41
【正文快照】： 0引言发电机不对称运行时,根据对称分量法,发电机定子绕组中的电流可分成正序、负序和零序电流分量[1-2]。其中负序电流产生的负序旋转磁场会以2倍于基波的角速度切割转子[3-4],在转子绕组中产生感应电势和电流,引起转子表面的附加损耗增加,可导致转子各部件温度升高,转子部件

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