| 引用本文: | 赵晓斌,谢小荣,李岩,邹常跃,辛清明.高压直流与含串补交流系统次/超同步铁磁谐振机理与解决措施[J].电力自动化设备,2021,41(7): |
| ZHAO Xiaobin,XIE Xiaorong,LI Yan,ZOU Changyue,XIN Qingming.Mechanism and counter-measure of sub-/super-synchronous ferromagnetic resonance between HVDC and AC system with series compensation[J].Electric Power Automation Equipment,2021,41(7): |
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| 摘要: |
| 结合2017年5月29日富宁站换相失败恢复过程中发生的次/超同步铁磁谐振现象，通过理论分析和仿真验证明确了高压直流与含串补交流系统发生次/超同步铁磁谐振的原因。含串补交流系统在次同步谐波下阻抗幅值大幅增加，次同步频率谐波与其互补频率谐波之间的耦合作用增强；利用奈奎斯特稳定判据对交直流系统的阻抗进行分析，考虑串补后交直流系统的稳定性下降但仍然是稳定的。次同步频率谐波的存在易使变压器铁芯饱和，使系统稳定性进一步下降。理论分析和仿真结果表明，发生大扰动后，在换流器调制和变压器铁芯饱和2种非线性因素的作用下，交直流系统出现次/超同步的铁磁谐振现象，串补和交流滤波器相配合可以有效抑制这一类型的谐振。 |
| 关键词: 高压直流输电 串补 次/超同步频率谐波 铁磁谐振 变压器饱和 |
| DOI：10.16081/j.epae.202105006 |
| 分类号:TM721.1 |
| 基金项目:国家自然科学基金资助项目(51537007)；中国南方电网公司科技项目(ZBKJXM20180617) |
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| Mechanism and counter-measure of sub-/super-synchronous ferromagnetic resonance between HVDC and AC system with series compensation |
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ZHAO Xiaobin1,2, XIE Xiaorong2, LI Yan1, ZOU Changyue1, XIN Qingming1
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1.State Key Laboratory of HVDC, Electric Power Research Institute, China Southern Power Grid, Guangzhou 510663, China;2.State Key Laboratory of Control and Simulation of Power System and Generation Equipment, Department of Electrical Engineering, Tsinghua University, Beijing 100084, China
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| Abstract: |
| The sub-/super-synchronous ferromagnetic resonance that occurred during the recovery process after a commutation failure at Funing Station on May 29,2017 is analyzed. The reason of sub-/super-synchronous ferromagnetic resonance between HVDC and AC system with SC(Series Compensation) is verified by theoretical analysis and simulation. The impedance magnitude is greatly increased in the AC system with SC at sub-synchronous frequency harmonics, so that the coupling between the sub-synchronous frequency harmonics and its complementary frequency harmonics is enhanced. The Nyquist stability criterion is used to analyze the impedance of the AC and DC system. Considering SC, the stability of the AC and DC system decreases but the system is still stable. The existence of sub-synchronous frequency harmonics easily makes the transformer saturated, lead to decrease the system stability. Theoretical analysis and simulative results show that, under the action of two non-linear factors of converter modulation and transformer core saturation, sub-/super-synchronous ferromagnetic resonance occurs in AC and DC system after large disturbance. The combination of SC and AC filters can effectively suppress this type of resonance. |
| Key words: HVDC power transmission series compensation sub-/super-synchronous frequency harmonics ferromagnetic resonance transformer saturation |
