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摘要现如今大容量电动机广泛用于电力行业，电动机的启动是一切工作的基础。电动机的启动势必会造成配电系统的电压波动，特别是大容量电动机启动，启动时刻引起的母线电压的降落会影响到整个电网的运行。因此，在工程设计中对电动机启动时供电系统的压降应认真核算，以便正确的选择最可靠、最经济的启动方式。本论文运用MATLAB和PSCAD两种仿真软件，建立电动机的全压启动方式、自耦变压器降压启动、软启动三种方式时的电力网络，来模拟电动机启动的瞬间，将三种起动方式所得到的转速、转矩、电流、母线电压的波形、数据进行分析对比，来观察此时电网考察点的电压变化情况，从而总结出全压启动时启动电流过大，会对电网造成极大冲击，因此可以应用降压启动和软启动两种方法来改善启动性能的结论。19263
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关键字 大容量电动机 全压启动 自耦变压器降压启动 软启动 电网
毕业论文设计说明书（论文）外文摘要
Title Research on Large-capacity Motor Start-up Mode and the Impact on the Grid
Abstract
Today，large.capacity motors are widely used in the power industry，the motor starting is the foundation of all our work，and is bound to cause voltage fluctuations distribution systems，especially large capacity motor starting，s the bus voltage drop cause main impact on the performance of the grid by the start time.Therefore，the pressure drop in the engineering design of the power supply system when the motor starts should be carefully accounted for，so that we can choose the most reliable and most economical way to start and the power supply system correctly.In this paper，i use two kinds of simulation software，MATLAB and PSCAD，to establish the the electricity network of three starting ways，full pressure start-up mode，autotransformer reduced voltage start-up mode，start-up mode. to simulate the instant the motor starts.I analysis and compare the waveform and data of speed, torque, current, bus voltage,to observe the grid voltage changes at this grid investigation point.Thus summed up that,the start-up current is too large and the grid will be impacted greatly when full pressure start mode .the grid will have a great impact.So we can conclude that full pressure and soft-start two start mode can improve the startup performance.
Keywords large capacity motor full voltage starting autotransformer starting soft starting grid
目 次
1 绪论 1
1.1 研究的目的和意义 1
1.2 研究现状 1
1.3 本文的主要工作内容 2
2 理论分析启动方式对相关地点电压的影响 3
2.1 全压启动 3
2.2 自耦变压器降压启动 4
2.3 软启动 5
2.4 启动方式的选择 6
2.5 本章小结 7
3 建立电动机仿真模型，分析动态过程及其影响 8
3.1 全压启动 8
3.2 自耦变压器降压启动 14
3.3 软启动 18
3.4 对以上三种启动方式的相关量进行比较分析 23
3.5 本章小结 24
4 对大容量电动机启动系统进行压降理论计算 25
4.1 大容量电动机系统启动理论分析 25
4.2 电动机启动系统电压降落的理论计算 26