基于柔性直流低频振荡阻尼控制器的优化设计  

Optimal Design of VSC-HVDC Low-frequency Oscillation Damping Controller

作　　者：朱显亮[1] 张英敏[1] 李兴源[1] 刘天琪[1] 郭磊[1] 张立奎[1] 刘凯[1] 

机构地区：[1]四川大学电气信息学院,四川成都610065

出　　处：《水电能源科学》2016年第11期196-199,共4页Water Resources and Power

基　　金：国家自然科学基金重点项目(51037003);国家电网公司大电网重大专项课题(SGCC-MPLG001-027-2012)

摘　　要：针对柔性直流(VSC-HVDC)低频振荡的问题,首先通过最小二乘—旋转不变的方法(TLS-ESPRIT)分析了系统的特性,辨识出系统的传递函数;接着运用LQR优化算法引入状态观测器,得到带观测器的控制器传递函数即所求控制器;然后利用遗传算法对LQR函数的参数Q、R进行优化,得出效果更加明显的控制器,从而实现对柔性直流低频振荡的有效控制;最后为比较最优控制器与其他控制器的效果,利用经典极点配置法设计了控制器。PSCAD/EMTDC仿真表明,最优控制器可较好地抑制各种扰动下的低频振荡,具有较好的鲁棒性;利用输出反馈,有利于工程实践。In view of the low frequency oscillation problems of the VSC-HVDC,the method of TLS-ESPRIT was used to analyze the characteristics of the system and identify the transfer function of the system.Then the LQR algorithm was applied to optimize the transfer function of the state observer and the controller was obtained.The parameters Qand Rof the LQR function were optimized by using genetic algorithm and the controller that has good effect was got,which realizes the effective control of the VSC-HVDC low-frequency oscillation.To compare the effect of the optimal controller with other controllers,the classical pole allocation method was adopted to design the controller.The PSCAD/EMTDC simulation shows that the optimal controller can better suppress the low frequency oscillation under various disturbances,and has good robustness;using output feedback is helpful for engineering practice.

关 键 词：柔性直流 低频振荡 优化 控制器 

分 类 号：TM721.1[电气工程—电力系统及自动化] TM571