引用本文: | 张保会,王 进,原 博,郝治国,黄仁谋,王小立.(四)风电场送出线路保护性能分析[J].电力自动化设备,2015,35(8): |
| 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,2015,35(8): |
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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 |
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基金项目:国家高技术研究发展计划(863计划)资助项目(2012AA050201) |
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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
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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
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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 |