摘要
系统分析了直流系统的基本输电控制方式和极控制方式、低电压下的模式转换控制以及依赖于电压的电流指令限制单元(VDCOL)控制对受端系统电压稳定性的影响。考虑到固定参数的VDCOL难以适应受端系统运行方式的多变性和故障的复杂性,提出了一种基于逆变站交流母线电压水平的动态自适应VDCOL控制策略。该控制策略中,VDCOL的高电压门槛值随逆变站交流母线电压变化而动态变化,能够在不同情况下合理控制直流电流。仿真表明,新型VDCOL有助于提高受端交流系统电压稳定性。
The influences of DC system＇s basic transmission mode,pole control mode,mode shift control and VDCOL（Voltage Dependent Current Order Limiter） on the voltage stability of receiving-end power grid are analyzed.As the VDCOL with fixed parameters could not easily adapt to the operating mode variability and fault complexity of receiving-end power grid,a dynamic adaptive VDCOL control strategy is proposed based on the AC bus voltage level of inverter substation.The high-voltage threshold changes with the variation of AC bus voltage to well control the DC current in different conditions.Simulation shows that the proposed strategy improves the voltage stability of receiving-end power grid.
出处
《电力自动化设备》
EI
CSCD
北大核心
2011年第4期69-73,77,共6页
Electric Power Automation Equipment
基金
国家电网公司重大科技项目(SGKJ[2009]12)~~
