| 引用本文: | 张保会,王 进,原 博,郝治国,黄仁谋,王小立.风电接入对继电保护的影响（四）—— 风电场送出线路保护性能分析[J].电力自动化设备,2014,34(4): |
| ZHANG Baohui,WANG Jin,YUAN Bo,HAO Zhiguo,HUANG Renmou,WANG Xiaoli.Impact of wind farm integration on relay protection（4）：performance analysisfor wind farm outgoing transmission line protection[J].Electric Power Automation Equipment,2014,34(4): |
|
| 摘要: |
| 分析了具备低电压穿越能力的双馈式风电场送出线路的故障特征，发现仅在三相金属性故障情况下风电场侧电压与电流同频率，其他故障情况下风电场侧短路电压、电流频率均不同；风电场的弱电源特性使得正负序阻抗远大于零序阻抗，接地故障时风电短路电流主要为零序分量，使得三相电流相近；风电场侧方向元件、距离元件、选相元件均无法保证正确动作。以某地区风电接入为例，对风电场送出线路保护进行动作性能测试，实验结果表明电流差动保护灵敏度降低，方向元件、距离元件、选相元件的动作性能受到严重影响。（详见2013年第33卷第4期） |
| 关键词: 低电压穿越 DFIG 风电场 送出线路 继电保护 |
| DOI： |
| 分类号: |
| 基金项目:国家高技术研究发展计划（863计划）资助项目（2012AA050201） |
|
| Impact of wind farm integration on relay protection（4）：performance analysisfor wind farm outgoing transmission line protection |
|
ZHANG Baohui1, WANG Jin1, YUAN Bo1, HAO Zhiguo1, HUANG Renmou2, WANG Xiaoli1,3
|
|
1.School of Electrical Engineering，Xi’an Jiaotong University，Xi’an 710049，China;2.Hainan Power Grid Corporation，Haikou 570100，China;3.Dispatch Center of Ningxia Electric Power，Yinchuan 750001，China
|
| Abstract: |
| The fault features of outgoing transmission line in DFIG-based wind farm with the capacity of low-voltage ride-through are analyzed，which shows that，the bus voltage at wind farm side and the short circuit current have same frequency only in the case of three-phase bolted fault while they are different in other fault cases；because the weak power characteristic of wind farm makes its positive- and negative-sequence impedance far greater than its zero-sequence impedance，the wind power short circuit current of grounding fault is mainly the zero-sequence component，resulting in three nearly same phase-currents；the direction element，distance element and phase-selection element at wind farm side operate incorrectly. The operating performance of the outgoing transmission line protection is tested for a regional grid-connected wind power and the experimental result shows that，the sensitivity of current differential protection reduces and the operating performances of direction element，distance element and phase-selection element are severely affected. |
| Key words: low-voltage ride-through doubly-fed induction generator wind farms outgoing transmission line relay protection |
