VSC-HVDC附加频率极点配置控制器设计  

An Additional Frequency Pole Assignment Controller for VSC-HVDC

作　　者：朱显亮[1] 张英敏[1] 李兴源[1] 褚正超[1] 郭磊[1] 王渝红[1] 

机构地区：[1]四川大学电气信息学院,成都市610065

出　　处：《电力建设》2016年第10期86-92,共7页Electric Power Construction

基　　金：国家电网公司大电网重大专项资助项目课题(SGCCM PLG001-027-2012)

摘　　要：为抑制柔性直流输电(voltage source converter-high voltage direct current,VSC-HVDC)低频振荡,提高柔性直流输电的输电能力,提出一种极点配置控制策略。利用改进的最小二乘旋转不变辨识算法,辨识出系统的开环传递函数。根据开环传递函数的根轨迹图,得到使其稳定的开环增益区间,进而得到较好增益下的闭环根轨迹极点,也就是期望极点。然后把得到的期望极点与配置的观测器极点结合起来,得到极点配置控制器。观测器减少工作量的同时,可以保证控制器较好的鲁棒性。为了显示控制器效果的优越性,利用经典根轨迹超前补偿设计法,设计出控制器与其进行对比。在PSCAD/EMTDC中的仿真结果表明,经典根轨迹法设计出的控制器效果不太明显,极点配置控制器可以较好地抑制VSC-HVDC在不同故障下的低频振荡,有较好的鲁棒性。In order to suppress the voltage source converter-high voltage direct current（ VSC-HVDC） low frequency oscillation and improve its transmission capacity,this paper proposes a control strategy for pole assignment. We use the improved TLS-ESPRIT recognition algorithm to identify the open-loop transfer function of the system. According to the root locus diagram of the open-loop transfer function,we get the open-loop gain interval which makes it stable,and then get the closed-loop root locus poles under a better gain which are desired poles. And then we combine the desired poles with the configured observer poles to obtain a pole assignment controller. The application of the observer controller can not only reduce the w ork load but also have better robustness. To show the superior effect of the proposed controller,we adopted the classical root locus advance compensation method to design the controller and compared it with the proposed controller. The simulation results in PSCAD / EM TDC show that the effect of the controller designed by the classical root locus method is not obvious,while the proposed pole assignment controller can better restrain low frequency oscillation of VSC-HVDC under the different malfunctions,and therefore has better robustness.

关 键 词：柔性直流输电 极点配置 根轨迹图 低频振荡 鲁棒性 

分 类 号：TM72[电气工程—电力系统及自动化]