| 引用本文: | 郑涛,卢婷,杨国生,等.GIC引发直流偏磁对距离保护Ⅲ段动作性能影响的分析[J].电力系统保护与控制,2015,43(2):1-5. |
| ZHENG Tao,LU Ting,YANG Guosheng,et al.Analysis of the effects on distance protection zone Ⅲ relays caused by DC bias induced from geomagnetic induced current[J].Power System Protection and Control,2015,43(2):1-5 |
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| 摘要: |
| 详细论述了直流系统单极运行及磁暴引发的变压器直流偏磁的异同点，进而探讨了地磁感应电流(GIC)的等效源建模问题。通过PSCAD/EMTDC平台搭建了计及变压器偏磁效应的双机系统仿真模型，对线路事故过负荷进行了仿真研究，分析评估线路距离保护耐受GIC的能力。仿真结果表明GIC通过中性点接地变压器侵入电力系统后，可能造成变压器铁心不对称饱和，从而使测量阻抗发生周期性波动。距离保护Ⅲ段作为下级变压器的远后备保护，在线路事故过负荷造成负荷转移的情况下，其动作可靠性降低，可能受GIC扰动而发生误动。 |
| 关键词: 地磁感应电流 直流偏磁 距离保护 事故过负荷 测量阻抗 |
| DOI：10.7667/j.issn.1674-3415.2015.02.001 |
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| Analysis of the effects on distance protection zone Ⅲ relays caused by DC bias induced from geomagnetic induced current |
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ZHENG Tao1, LU Ting1, YANG Guosheng2, LIU Lianguang1
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1.State Key Laboratory for Alternate Electrical Power System with Renewable Energy Sources, North China Electric Power University, Beijing 102206, China;2.China Electric Power Research Institute, Beijing 100192, China
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| Abstract: |
| This paper describes the similarities and differences between the DC bias’ influences on transformers made by geomagnetic induced current (GIC) and HVDC in detail. Then the simulation of GIC is discussed and a simulation system is built based on PSCAD / EMTDC platform. Then the case of post-fault over load is simulated and the performance of distance protection is analyzed. The result demonstrates that when GIC invades power systems through transformers with neutral grounded the transformer core may become asymmetric saturated, which may cause the measured impedance in the state of cyclical fluctuations and distance protection zone Ⅲ which backs up for adjacent transformer is possible to mal-operate under the case of post-fault over load. |
| Key words: geomagnetic induced current (GIC) DC bias distance protection post-fault over load measured impedance |
