背靠背三电平VSC-HVDC非线性反演控制  

Back-to-back Three-level VSC-HVDC Non-linear Backstepping Control

作　　者：董素玲[1] 

机构地区：[1]江苏建筑职业技术学院机电工程学院,江苏徐州221116

出　　处：《电力电容器与无功补偿》2016年第4期105-110,共6页Power Capacitor & Reactive Power Compensation

摘　　要：研究了一种应用于背靠背三电平VSC-HVDC系统的非线性反演控制策略,解决了传统PI线性控制策略存在的动态响应缓慢、系统再稳定恢复时间长等问题。根据李雅普诺夫稳定性定理,构造了李雅普诺夫函数,分别设计了非线性母线电压和内环电流控制器。仿真实验结果表明,当电网功率扰动或潮流反转时,反演控制较传统PI控制具有更加优越的动、稳态性能,同时也大大减小了母线电压和电容电压的暂态纹波。A kind of non-linear backstepping control strategy for back-to-back three-level VSC-HVDC system is studied,and such problem existed in the PI linear control strategy as slow dynamic response and long more stable recovery time of system is solved. According to Lyapunov stability principle, the Lyapunov function is constructed and the non-linear bus voltage and inner ring current controller are designed respectively. It is shown by the simulation and experiment result that in case of power perturba- tion of power grid or flow reversal,the backstepping control has superior dynamic and stable performance to traditional PI control and,at the same time,reduces greatly transient ripple of bus voltage and capacitive voltage.

关 键 词：反演控制 李雅普诺夫函数 潮流反转 电容电压 

分 类 号：TM721.1[电气工程—电力系统及自动化]