摘要
特高压直流输电系统受扰后,其直流动态特性及其与受端交流电网的相互作用,对电网安全稳定性将会产生较大的影响。为此,针对目前国内广泛应用的BPA电力系统仿真软件,分析了3种不同直流控制系统仿真模型结构特征。通过时域仿真,研究了安全稳定计算中采用不同模型及其关键控制器参数对受端交流电网故障恢复特性的影响,包括不同的换相失败模拟方法、直流定功率控制电压测量时间常数以及低电压限电流启动电压门槛值等。研究结果表明:对于故障后动态电压支撑能力较弱的受端电网,换相失败模拟方法会显著影响电压恢复特性;增大直流定功率控制电压测量时间常数以及提升低电压限电流启动电压门槛值,可降低故障恢复期间逆变器无功消耗,有利于改善受端电网的恢复特性。
After ultra-high voltage direct current（UHVDC） transmission system is suffered from disturbance,the complex dynamic characteristic of DC system and the interaction between AC and DC systems will affect the security and stability of power grid significantly.Therefore,aiming at the power system simulation software BPA widely used in China,we analyzed the structural features of three different simulation models of HVDC control system.By the time-domain simulation,we studied the influence of different models and key controller parameters adopted in hybrid power grid’s security and stability calculation,including commutation failure simulation method,voltage measurement time constant of power controller and the start voltage threshold of voltage dependent current order limit（VDCOL）,on the recovery characteristics.Simulation results show that the commutation failure simulation method impacts the recovery characteristic significantly for weak power grids;increasing the voltage measurement time constant and enhancing the start voltage threshold can decrease the reactive power consumption of inverter,and can help improve the recovery characteristic of receiving systems.
出处
《高电压技术》
EI
CAS
CSCD
北大核心
2013年第3期555-561,共7页
High Voltage Engineering
基金
国家电网公司大电网重大专项资助项目(SGCC-MPLG001-2012)~~
关键词
特高压直流
控制系统模型
受端电网
恢复特性
换相失败
电压测量时间常数
低电压限电流
UHVDC
control system model
received power grid
recovery characteristic
commutation failure
voltage measurement time constant
voltage dependent current order limit
