考虑电压无功耦合特性的多馈入系统换相失败预防控制方法  

Prevention and control method of commutation failure in MIDC considering voltage and reactive power coupling characteristics

作　　者：韩伟 叶俊君 肖超 刘超 王默 欧阳金鑫[2] HAN Wei;YE Jun-jun;XIAO Chao;LIU Chao;WANG Mo;OUYANG Jin-xin(Electric Power Research Institute of State Grid Henan Electric Power Company,Zhengzhou 450052,China;State Key Laboratory of Power Transmission Equipment&System Security and Technology(Chongqing University),Chongqing 400044,China)

机构地区：[1]国网河南省电力公司电力科学研究院,河南郑州450052 [2]输配电装备及系统安全与新技术国家重点实验室(重庆大学),重庆400044

出　　处：《电工电能新技术》2022年第3期63-71,共9页Advanced Technology of Electrical Engineering and Energy

摘　　要：基于晶闸管的高压直流输电(LCC-HVDC)以其在大容量远距离输电的优势得到了广泛应用,直流密集接入交流电网形成了复杂的多馈入直流输电系统。在多馈入直流输电系统中,不同LCC-HVDC间的无功电压耦合关系密切,单回LCC-HVDC换相失败后控制器响应会对相邻LCC-HVDC产生交互影响,可能造成继发性的换相失败。目前,LCC-HVDC换相失败的抑制难以计及相邻LCC-HVDC的影响,可能引发严重后果。为此,本文通过分析不同触发角下LCC-HVDC对交流电压和无功特性的影响,分析了多回LCC-HVDC的无功电压耦合特性,提出了计及对相邻LCC-HVDC影响的预防控制启动电压值和触发角调节量计算方法,进而提出了一种考虑无功电压耦合特性的换相失败预防控制方法,最后通过CIGRE标准测试模型验证所提出方法的有效性。该方法能够在有效降低单回LCC-HVDC无功需求的同时,防止其过量触发而增加其他LCC-HVDC发生换相失败的概率。The thyristor-based HVDC has been widely used for its advantages of large capacity and long distance transmission,which leads to complicated multi-infeed HVDC systems(MIDC).In MIDC,the reactive voltage coupling relationship between different LCC-HVDC is close.The controller response will have an interactive effect on the adjacent LCC-HVDC after commutation failure,which causes secondary commutation failures.At present,the suppression of LCC-HVDC commutation failure is difficult to consider the influence of adjacent LCC-HVDC,which may cause serious consequences.In view of this situation,this paper analyzes the influence on AC voltage and reactive power characteristics under different firing angles.The coupling characteristics of multiple LCC-HVDC are analyzed.A calculation method of starting voltage value and firing angle adjustment considering the influence on adjacent LCC-HVDC is proposed.Then,a commutation failure prevention control method considering the coupling characteristics of reactive power and voltage is proposed.Finally,the correctness of the theoretical analysis and predictive method is verified through the CIGRE HVDC standard system.This method can effectively reduce LCC-HVDC reactive power demand,and decrease the probability of commutation failure of the adjacent LCC-HVDC.

关 键 词：多馈入直流输电系统 换相失败 无功耦合 换相失败预防控制 

分 类 号：TM743[电气工程—电力系统及自动化]