基于修正开关函数的LCC-HVDC整流站直流侧阻抗建模  

DC Side Impedance Modeling of LCC-HVDC Rectifier Station Based on Modified Switching Function

作　　者：张海川 杨武 李家银 廖伟 ZHANG Haichuan;YANG Wu;LI Jiayin;LIAO Wei(Yalong River Hydropower Development Company Ltd.,Chengdu Sichuan 610051)

机构地区：[1]雅砻江流域水电开发有限公司,四川成都610051

出　　处：《四川水力发电》2024年第S01期154-159,共6页Sichuan Hydropower

摘　　要：电网换相换流器高压直流输电凭借输送容量大、距离远等优势在国内得到广泛应用。换流站作为交直流系统连接枢纽,其精确建模具有十分重要的意义。该文提出一种将换流变压器等值漏感折算至直流侧后的开关函数修正模型,该模型从根本上计及换流站的换相过程,能够准确计算出稳态直流电压;同时基于该修正模型,建立了LCC-HVDC整流站的小信号直流侧低频阻抗模型。最后,在PSCAD/EMTDC中利用Cigre Benchmark模型,对提出的开关函数修正模型及建立的LCC整流站阻抗模型进行仿真验证,证明模型的正确性。Domestically,LCC-HVDC has been widely used due to its advantages of large transmission capacity and long distance.The converter is the junction of AC and DC system,whose precise model is of great significance.A modified switching function model is proposed by equalizing the leakage inductance of transformer in converter station to DC side.In this model,the commutation process of converter station is considered,so that the steady state DC voltage can be calculated accurately.Then,based on aforementioned modified switching function model,the low frequency impedance model of rectifier station in LCC-HVDC is established.Finally,using the Cigre Benchmark model built in PSCAD/EMTDC,the proposed models are verified,and the results prove the correctness of the models.

关 键 词：电网换相换流器高压直流输电 开关函数 低频阻抗建模 小信号模型 

分 类 号：TM[电气工程]