| 交直流互联系统对距离保护动作特性的影响分析及对策 |
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| 引用本文： | 申洪明,黄少锋,费彬.交直流互联系统对距离保护动作特性的影响分析及对策[J].电力系统自动化,2015,39(11):58-63. |
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| 作者姓名： | 申洪明 黄少锋 费彬 |
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| 作者单位： | 新能源电力系统国家重点实验室，华北电力大学，北京市 102206 |
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| 基金项目： | 国家重点基础研究发展计划(973计划)资助项目(2012CB215206) |
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| 摘 要： | 交直流互联系统换相失败时引起的电磁暂态过程与纯交流环境时不同,从而对交流工频量的距离保护的动作行为产生影响。通过引入象限的概念,分析了换相失败期间逆变器交流侧等值工频电流的暂态特性,然后详细研究了考虑零序补偿电流下换相失败对距离保护的具体影响,分析结果表明,换相失败对距离保护的影响主要与故障位置以及过渡电阻的大小有关;并提出了基于零序方向元件及基于测量电抗变化的"纵续"动作的解决措施。大量的PSCAD/EMTDC仿真结果验证了结论的正确性。
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| 关 键 词： | 换相失败 距离保护 过渡电阻 零序方向元件 “纵续”动作 |
| 收稿时间： | 2014/5/29 0:00:00 |
| 修稿时间： | 2014/10/11 0:00:00 |
Effect Analysis of AC/DC Interconnected Network on Distance Protection Performance and Countermeasures |
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| SHEN Hongming,HUANG Shaofeng and FEI Bin.Effect Analysis of AC/DC Interconnected Network on Distance Protection Performance and Countermeasures[J].Automation of Electric Power Systems,2015,39(11):58-63. |
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| Authors: | SHEN Hongming HUANG Shaofeng and FEI Bin |
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| Affiliation: | State Key Laboratory of Alternate Electrical Power System with Renewable Energy Sources, North China Electric Power University, Beijing 102206, China,State Key Laboratory of Alternate Electrical Power System with Renewable Energy Sources, North China Electric Power University, Beijing 102206, China and State Key Laboratory of Alternate Electrical Power System with Renewable Energy Sources, North China Electric Power University, Beijing 102206, China |
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| Abstract: | The transient process caused by commutation failure in an AC/DC interconnected system is not the same as that of the purely AC system, which affects the performance of distance protection that uses the fundamental frequency. The transient characteristic of equivalent power-frequency current on the inverter side is analyzed first by introducing the concept of quadrant. Then, the effect of commutation failure on distance protection is studied in detail by considering the connection mode of relay. The analysis results show that the fault position and fault resistance both significantly influence the performance of distance protection. Furthermore, novel countermeasures based on the zero-sequence directional component and the successive trip used for measuring the change of reactance are put forward. Simulation results based on PSCAD/EMTDC have proved the conclusion correct. This work is supported by National Basic Research Program of China (973 Program) (No. 2012CB215206). |
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| Keywords: | commutation failure distance protection transition resistance zero-sequence directional component successive trip |
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