论文总字数：23607字

摘 要

为了研究小风速信号接入电网的稳定性，在电厂仿真软件中采用了三九节点标准系统作为测试系统。主要研究内容如下：通过逐步增加与发送节点和接收节点相连的风能的有功产量，研究了阻尼比的变化趋势；采用相同的风电机组容量替代电网中的常规电站后，研究风电场有功发电量与阻尼比的变化趋势；由于双功率感应风力机具有无功控制的能力，未来风电场的无功控制是必要的，本文还研究了阻尼比随无功功率产生的变化趋势。同时，随着风电装机容量的不断增长，风电场被迫取代部分传统发电厂，本表计算了风力涡轮机对双燃料感应的无功功率限制，并在定子侧变流器和发电机的控制系统中添加了电压控制环电网侧变流器。电压降到网点时产生的电压差作为输入信号，控制双功率风电机组的无功输出，为电压恢复提供无功能量支持，PSCAD/EMTDC仿真软件验证了DFIG的无功功率控制能力能够提高暂态电压的稳定性。

关键词：电力系统稳定性输电系统；风电场；小干扰稳定。

Abstract

To study wind farms connect the electrical system small signal stability problems. Based on the DIgSILENT/Power Factory simulation analysis software using the standard system of three machines of nine nodes as a test system, Studied gradually increasing the active power of the wind connected to the sending node and the trend of the ratio of dampening of the receiving node. Replace conventional power plants in the system with the same capacity as wind farms, seek the mitigation ratio with the trend towards active change in wind energy production.As wind turbine induction with dual power supply with reactive power control capability, and future development must be applied to its reactive power control capability, The relationship of damping with the trend of production of reactive energy is studied. With the continuous increase of installed capacity of wind energy, the wind company will inevitably replace the current conventional coal power plants, wind energy should also be considered responsible for the task of regulating the system.At the same time，Dual-powered wind turbines reactivate the energy output limit, and in the control system of the lateral stator and network converter to join the voltage ring to control the reactivation of the dual-powered wind turbines, Providing support for voltage recovery. Using the PSCAD/EMTDC simulation verified with the use of double-powered wind turbines, the reactive control capability can improve the stability of the transitory voltage.

Keywords：Power system stability；wind farm；small signal stability.

目录

摘要 I

Abstract II

第1章绪论…………………………………………………………………………………………………………………………7

1.1 论文选题背景及意义…………………………………………………………………………………………….7

1.2 风电场发电的发展………………………………………………………………………………………………..8

1.3 国内外研究现状…………………………………………………………………………………………………….8

1.3.1风电机组类型介绍…………………………………………………………………………………………………9

1.3.2含风电场的电力系统稳定性研究…………………………………………………………………………11

1.4 论文的主要工作………………………………………………………………………………………………………12

第2章风电场接入电力系统小干扰稳定分析方法及风力发电机组模型的建立……………13

2.1 小干扰稳定性分析方法………………………………………………………………………………………..13

2.1.1 小干扰稳定性的定义……………………………………………………………………………………………13

2.1.2稳定性的判断………………………………………………………………………………………………………..13

2.2 状态矩阵的特征值分析…………………………………………………………………………………………13

2.2.1特征值与特征向量…………………………………………………………………………………………………13

2.2.2 振荡频率与阻尼比………………………………………………………………………………………………..14

2.3 电力系统低频振荡分析………………………………………………………………………………………….15

2.4 风电场和电力系统模型………………………………………………………………………………………….15

2.4.1 风电场模型…………………………………………………………………………………………………………….15

2.4.2 电力系统模型…………………………………………………………………………………………………………16

第3章算例分析…………………………………………………………………………………………………………………..18

3.1 原电网的振荡模态………………………………………………………………………………………………….18

3.2 风电场接入送端节点………………………………………………………………………………………………18

3.2.1风电场接入受端节点………………………………………………………………………………………………20

3.2.2风电场代替传统发电厂………………………………………………………………………………………….22

3.2.3改变风电场无功出力情况……………………………………………………………………………………..24

第4章结论………….………………………………………………………………………………………………………………24

4.1 结论…………………………………………………………………………………………………………………………28

参考文献……………………………………………………………………………………………………………………………..25

致谢………………………………………………………………………………………………………………………………………28

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