可控换相换流器耗能模式工作原理及电气建模  

Study on Working Principle and Electrical Modeling of Energy Consumption Mode of Controllable Line-commutated Converter

作　　者：张静 高冲 杨俊 汤广福 王成昊 盛财旺 ZHANG Jing;GAO Chong;YANG Jun;TANG Guangfu;WANG Chenghao;SHENG Caiwang(State Key Laboratory of Advanced Power Transmission Technology,State Grid Smart Grid Research Institute Co.,Ltd.,Beijing 102218,China;Huairou Laboratory,Beijing 101400,China)

机构地区：[1]先进输电技术全国重点实验室(国网智能电网研究院有限公司),北京102218 [2]怀柔实验室,北京101400

出　　处：《高电压技术》2024年第7期2784-2793,I0002,共11页High Voltage Engineering

基　　金：国家重点研发计划(2021YFB2400900)。

摘　　要：可控换相换流器(controllableline-commutedconverter,CLCC)具备可控关断能力,能够消除交流系统单相接地引起的换相失败故障,但是故障期间,直流传输功率仍会下降;为此,提出了CLCC主避雷器和V13子阀避雷器充当耗能电阻的耗能模式工作原理,建立了阀避雷器非线性时变电压源模型,求解了耗能模式下CLCC工作电路电气方程,确定了V13子阀避雷器残压值和阀提前关断时间对耗能功率的影响规律,搭建了包含维持系统传输功率为恒定值的闭环控制策略直流系统仿真模型,证明了CLCC在发挥换流作用的同时充当直流耗能装置,逆变站交流系统无法消纳的功率可由CLCC消耗掉,系统的直流功率将不会发生波动,可以把逆变站交流系统单相接地故障对直流系统的冲击降至最小。Controllable line-commutated converter(CLCC)has the controllable switching-off capability and can eliminate commutation failure caused by the single-phase grounding fault of AC system;however,during the fault period,the DC transmission power will still drop.Therefore,this paper presents the working principle of energy consumption mode in which CLCC main arrester and V13 sub-valve arrester act as energy consumption resistors,the nonlinear time-varying voltage source model of valve arrester is established and the electric equation of CLCC working circuit under energy consumption mode is solved.Moreover,the influence law of residual voltage value of V13 sub-valve arrester and early closing time of valve on energy consumption power is determined,and the DC system simulation model with closed-loop control strategy that can maintain the transmission power of the system at a constant value is established.It is proved that CLCC acts as a DC energy consuming device while playing the role of converter,the power that can not be absorbed by the AC system of the inverter station can be consumed by CLCC,the DC power of the system will not fluctuate,and the impact of the single-phase grounding fault of the AC system of the inverter station on the DC system can be minimized.

关 键 词：直流输电 可控换相 换相失败 耗能模式 阀避雷器 时变电压源模型 

分 类 号：TM721.1[电气工程—电力系统及自动化]