西北电网主变充电引起青藏直流闭锁的原因分析及对策

种芝艺; 粟小华; 刘宝宏

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电力建设 ›› 2013, Vol. 34 ›› Issue (3) : 88-91.

运行与管理

西北电网主变充电引起青藏直流闭锁的原因分析及对策

种芝艺1，粟小华2，刘宝宏1

作者信息 +

Analysis and Countermeasures of Qinghai-Tibet DC Blocking Caused by Main Transformer Charging in Northwest Power Grid

CHONG Zhiyi1，SU Xiaohua2，LIU Baohong1

Author information +

文章历史 +

摘要

根据系统谐波阻抗扫描和EMTDC仿真验证，分析了西北电网主变充电产生的2次谐波电压在柴达木换流站放大的原因，提出了抑制变压器合闸励磁涌流的措施。为了降低西北电网主变充电产生的2次谐波对直流系统运行的影响，利用直流系统设备耐受谐波的能力，在交流系统安全稳定的条件下对直流谐波保护进行了优化，并应用到青藏工程中。优化后的谐波保护提高了青藏直流联网工程适应弱交流系统的能力，降低了直流系统强迫停运的概率。

Abstract

Through harmonic impedance scanning and EMTDC simulation of AC system, the reason why the second-harmonic voltage, generated by the main transformers charging in the northwest power grid, was amplified in Chaidamu converter station is analyzed in this paper. Then some countermeasures are put forward to inhibit the inrush current during transformer switching-in. In order to reduce the impact of secondharmonic on the operation of DC system, based on the equipments’ harmonic tolerance capacity in DC system, the DC harmonic protection under the security and stability condition of AC system is optimized, which has been applied to the Qinghai-Tibet Project. The optimized harmonic protection can improve the adaptability of Qinghai-Tibet DC Project to the weak AC system, and reduce the forced outage rate of DC system.

导出引用

种芝艺，粟小华，刘宝宏. 西北电网主变充电引起青藏直流闭锁的原因分析及对策[J]. 电力建设. 2013, 34(3): 88-91

CHONG Zhiyi，SU Xiaohua，LIU Baohong. Analysis and Countermeasures of Qinghai-Tibet DC Blocking Caused by Main Transformer Charging in Northwest Power Grid[J]. Electric Power Construction. 2013, 34(3): 88-91

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