VSC-HVDC系统输电线路参数对传输功率的影响分析  

Analysis the Influence of Transmission Line Parameters on Transmission Power in VSC-HVDC System

作　　者：刘回 艾松波 朱晓晖 

机构地区：[1]长沙理工大学电气与信息工程工程学院,长沙410114

出　　处：《电力学报》2017年第6期460-465,489,共7页Journal of Electric Power

摘　　要：建立柔性直流输电系统(VSC-HVDC)的直流网络等效电路。逆变站采用定有功功率控制,整流站采用定直流电压控制,来保持系统有功功率的平衡。同时由于逆变站采用定有功功率控制,系统将会出现恒功率特性从而影响系统的稳定性和传输功率大小。研究将逆变站等效为一个小信号阻抗模型,通过劳斯稳态判据来判定系统的稳定性,然后分析阻抗模型中的系统直流输电线路参数对系统传输容量的影响。最后,利用PSCAD/EMTDC软件进行仿真验证,通过分析得出在构建直流输电系统时,直流输电线路的电阻、电感、电容与系统的传输容量大小关系。Through the establishment of VSC-HVDC DC network equivalent circuit,The inverter station adopts active power control and rectifier station uses AC voltage control,to maintain the system balance of active power.At the same time,as the inverter station using active power control,the system appear the characteristic of constant power to affect the stability of the system and the size of transmission power.In this paper,it take the equivalent inverter station as a small signal impedance model,and make a judge of the stability of the system by the rouse steady-state criterion.Then analyze the influence of transmission line parameter of the system on the transmission capacity of the system.Finally,simulation is conducted by using PSCAD/EMTDC software.The simulation results demonstrate that the DC transmission capacity is quite affected by the transmission line parameter in the VSC-HVDC system.

关 键 词：柔性直流输电 小信号建模 逆变器阻抗模型 劳斯稳态 输电线路参数 传输容量 

分 类 号：TM721.1[电气工程—电力系统及自动化]