摘要
随着多端柔性直流输电系统中换流站数量的不断增多,为了分配多个换流站的直流电压控制权,提出了一种新型的灵活裕度控制策略。其通过采集直流电压差值实时计算权衡系数,确定直流电压控制与有功功率控制所占比例;该控制策略能够实现有功功率裕度控制模式和直流电压裕度控制模式,分析了2种模式下的功率电压特性曲线;最后在MATLAB/SIMULINK中搭建了4端柔性直流输电系统进行仿真。结果表明,该控制策略的2种控制模式实现了直流电压控制权的多级交接,能够较快地控制直流母线电压,适用于较复杂的多端柔性直流输电系统。
With the increase of convertor stations of multi-terminal VSC-HVDC transmission system,we propose a novel control strategy of flexible margin control method to distribute the DC voltage control hierarchy. The strategy regulates the proportion of DC voltage control and active power control using a coefficient calculated by DC voltage error. The active power margin mode and DC voltage margin mode are set according to the different system requirements. Then the power-voltage curve is analyzed. A typical four-terminal VSC-based high-voltage DC transmission system is built for simulation verification based on MATLAB/SIMULINK. The results show that the two modes of this control strategy can distribute the DC voltage control hierarchy well, and control the DC voltage quickly and effectively. The control strategy can be used in complicated VSC-MTDC system.
出处
《高电压技术》
EI
CAS
CSCD
北大核心
2016年第10期3126-3132,共7页
High Voltage Engineering
基金
国家电网公司科技项目:±500 kV柔性直流电网换流站级和系统级控制保护设备研制~~
关键词
多端柔性直流输电
电压裕度控制
下垂控制
灵活裕度控制
功率-电压特性曲线
multi-terminal VSC-HVDC transmission
voltage margin control
droop control
flexible margin control
curves of power-voltage characteristics
