YNd和Yd变压器接线组别对发电机非全相运行电流的影响  

Influences of the YNd and Yd transformer wiring group on the generator open-phase operation current

作　　者：戈宝军[1] 殷继伟[1] 陶大军[1] 辛鹏[1] 赵洪森[1] 

机构地区：[1]哈尔滨理工大学电气与电子工程学院,黑龙江哈尔滨150080

出　　处：《电机与控制学报》2017年第4期95-104,共10页Electric Machines and Control

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)

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。Open-phase operation condition can bring about negative sequence current in stator winding. If the judgment on the stator negative sequence current is not reasonable, then the serious power system accidents may happen. To accurately analyze the influence of YNd wiring group and Yd wiring group on sta-tor current in the generator under open-phase operation condition, firstly the phasor relationship between voltage and current of different YNd wiring group and Yd wiring group of high voltage side and low voltage side was given. Afterwards the physical processes of YNd connection transformer and Yd connection transformer of high voltage with one phase open and two phase open were studied by the analytical method. Mathematical models of three phase stator current of generator after faults above were established. Based on that, phasor diagrams of stator current were given. The variation laws of the stator current of YNd connection transformer and Yd connection transformer of high voltage with one phase open and two phase open were revealed. Finally taking a 1 407 MVA turbo-generator as an example, the stator three phase current were calculated when A phase current of generator of high voltage side of YNdl connection was open. The simulated result agrees with analytical analysis, which verifies the correctness of analytical analysis.

关 键 词：非全相 发电机 定子电流 变压器 接线组别 

分 类 号：TM314[电气工程—电机]