基于逆阻型IGCT的高压直流输电系统电压稳定性评估  

Voltage Stability Assessment for Reverse-blocking-IGCT-based HVDC Transmission System

作　　者：张楠[1] 张哲任[1] 徐政[1] ZHANG Nan;ZHANG Zheren;XU Zheng(College of Electrical Engineering,Zhejiang University,Hangzhou 310027,China)

机构地区：[1]浙江大学电气工程学院,杭州310027

出　　处：《高电压技术》2025年第3期1329-1338,共10页High Voltage Engineering

基　　金：国家自然科学基金(U23B6008)。

摘　　要：传统高压直流输电系统易发生换相失败,且在弱交流系统中难以维持稳定运行。随着逆阻型集成门极换流晶闸管(reverse blocking integrated gate-commutated thyristor,RB-IGCT)技术的发展,RB-IGCT型换流器为解决换相失败问题提供了一种有效方案。然而,现有研究尚未充分评估基于RB-IGCT高压直流输电系统的电压稳定性。因此,该文首先基于准稳态模型,分析了RB-IGCT型换流器的功率稳定性和其受端交流系统的电压支撑能力。然后通过计算临界短路比,论证了RB-IGCT换流器在低短路比条件下的稳定运行能力。其次,对比研究了受端交流故障下电网换相换流器(line commutated converter,LCC)逆变站和RB-IGCT逆变站的暂态故障恢复特性。最后,通过PSCAD仿真验证可知,基于RB-IGCT的高压直流输电系统在弱交流系统下的小干扰电压稳定性和暂态电压稳定性均优于传统高压直流输电系统,进一步证明了RB-IGCT换流器在未来高压直流输电工程中的应用潜力。The traditional HVDC transmission system is not only prone to commutation failure,but also difficult to maintain stable operation in weak AC systems.With the development of reverse blocking integrated gate commutated thyristors(RB-IGCT),the converter based on RB-IGCTs provides an effective solution to the commutation failure prob-lem.However,existing studies have not adequately assessed the voltage stability of RB-IGCT-based HVDC systems.Therefore,in this paper,based on the quasi-steady state model,the power stability and voltage support capability are ana-lyzed.Secondly,by calculating the critical short-circuit ratio,the ability of the RB-IGCT-based converters to maintain stable operation under the condition of low short-circuit ratios is proved.Then,the transient fault recovery characteristics of LCC and the RB-IGCT-based inverter station under receiving AC faults are studied,respectively.Finally,through PSCAD simulation,it is further verified that the RB-IGCT-based HVDC transmission system exhibits superior small-signal voltage stability and transient voltage stability compared to LCCs in weak AC systems,highlighting their potentials for future HVDC applications.

关 键 词：HVDC 临界短路比 暂态电压稳定 换相失败 逆阻型集成门极换流晶闸管 

分 类 号：TM721[电气工程—电力系统及自动化]