| 引用本文: | 费 彬,黄少锋,申洪明.交直流互联系统对距离保护的影响分析及对策[J].电力自动化设备,2015,35(8): |
| FEI Bin,HUANG Shaofeng,SHEN Hongming.Impact of AC-DC interconnected system on distance protection and countermeasure[J].Electric Power Automation Equipment,2015,35(8): |
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| 摘要: |
| 交直流互联系统的故障暂态过程与纯交流系统有所不同，从而会对距离保护的动作特性产生影响。对传统交直流互联系统模型进行了分析，同时基于零序电流的分布情况对模型进行了改进。基于叠加原理，结合接地阻抗继电器的接线方式，详细分析了直流馈入对距离保护的影响，并提出了增加零序方向元件辅助判别的解决措施。基于PSCAD／EMTDC的仿真结果验证了改进模型的有效性和理论分析的正确性。 |
| 关键词: 交直流互联系统 高压直流输电 继电保护 距离保护 模型 叠加原理 过渡电阻 零序方向元件 仿真 |
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| 基金项目:国家重点基础研究发展计划（973计划）项目（2012 -CB215206）；中央高校基本科研业务费专项基金资助项目（2015-XS016）；北京市国内外联合培养研究生共建项目 |
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| Impact of AC-DC interconnected system on distance protection and countermeasure |
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FEI Bin, HUANG Shaofeng, SHEN Hongming
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State Key Laboratory of Alternate Electrical Power System with Renewable Energy Source， North China Electric Power University，Beijing 102206，China
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| Abstract: |
| The fault transient process of AC-DC interconnected system is different from that of AC power system，which influences the operating characteristics of distance protection. The traditional model of AC-DC interconnected system is analyzed and improved based on the distribution of zero-sequence currents. Combined with the wiring mode of grounding impedance relay and based on the superposition theory，the impact of DC feed-in on the distance protection is analyzed in detail and an additional zero-sequence directional element is proposed as a countermeasure. The results of PSCAD／EMTDC-based simulation verify the validity of the improved model and the correctness of theoretical analysis. |
| Key words: AC-DC interconnected system HVDC power transmission relay protection distance protection models superposition principle transition resistance zero-sequence directional element computer simulation |
