考虑送受端电网连锁反应的多馈入直流输电系统换相失败控制方法  

Commutation failure control method for multi-infeed DC system considering chain reaction of sending and receiving end grids

作　　者：欧阳金鑫[1] 陶睿 庞茗予 潘馨钰 肖超 OUYANG Jinxin;TAO Rui;PANG Mingyu;PAN Xinyu;XIAO Chao(National Key Laboratory of Power Transmission Equipment Technology,Chongqing University,Chongqing 400044,China;Electric Power Research Institute of State Grid Henan Electric Power Company,Zhengzhou 450052,China)

机构地区：[1]重庆大学输变电装备技术全国重点实验室,重庆400044 [2]国网河南省电力公司电力科学研究院,河南郑州450052

出　　处：《电力自动化设备》2025年第5期153-160,共8页Electric Power Automation Equipment

基　　金：国家自然科学基金资助项目(51877018)。

摘　　要：多馈入直流输电系统之间耦合紧密,首次换相失败后若控制不当可能引发后续换相失败、送端过电压和相邻直流相继换相失败等连锁反应。为此,提出了基于多馈入直流输电系统换相失败安全域的送受端连锁反应抑制方法。分析了换相失败及控制系统作用下多馈入直流输电系统送受端连锁反应的过程;通过对避免后续换相失败和整流站过电压的直流电流的解析,建立了单回直流输电系统换相失败安全域;进一步推导了避免相继换相失败的直流电流范围,建立了多馈入直流输电系统换相失败安全域,进而提出了抑制送受端连锁反应的自适应电流控制方法。仿真结果表明所提方法能够有效抑制多馈入直流系统的相继换相失败和后续换相失败,并缓解送端过电压。Multi-infeed DC system is closely coupled with its adjacent systems,and improper initial commutation failure may lead to cascading failures such as subsequent commutation failures,overvoltage at the sending end,and sequential commutation failures in adjacent DC systems.To address this issue,a chain reaction suppression method for sending and receiving ends based on the commutation failure safety region of multi-infeed DC systems is proposed.The chain reaction process at both sending and receiving ends under commutation failure and control system actions is analyzed.A safety region for a single DC system is established by determining the critical DC current range to avoid subsequent commutation failure and rectifier station overvoltage.Further,the safety region for multi-infeed DC system is established by deriving the DC current constraints to avoid sequential commutation failures.An adaptive current control method is then proposed to suppress chain reactions at both sending and receiving ends.Simulative results demonstrate that the proposed method effectively mitigates sequential and subsequent commutation failures in multi-infeed DC systems while alleviating overvoltage at the sending end.

关 键 词：交直流混合输电系统 多馈入直流输电系统 换相失败 暂态过电压 连锁故障 

分 类 号：TM77[电气工程—电力系统及自动化] TM721.1