高压直流自适应变结构控制器设计  

Design of Self-adaptive Variable Structure Controller of HVDC System

作　　者：付伟[1] 刘天琪[1] 李兴源[1] 赵睿[1] 李保宏[1] 

机构地区：[1]四川大学电气信息学院,成都610065

出　　处：《电力系统及其自动化学报》2017年第5期28-34,共7页Proceedings of the CSU-EPSA

基　　金：国家自然科学基金资助项目(51037003);国家电网公司大电网重大专项资助项目课题(SGCC-MPLG001-027-2012)

摘　　要：当系统运行工作点没有发生变化或者变化较小时,基于总体最小二乘-旋转不变技术TLS-ESPRIT(totalleast squares-estimation on signal parameters via rotational invariance technique)辨识方法设计的新型高压直流(high voltage direct current,HVDC)附加变结构控制器相比现有变结构控制具有更好的控制效果,但是在系统发生较大扰动导致运行工作点发生变化时,基于实际系统设计原则的现有变结构控制器控制效果往往优于新型变结构控制器。为进一步优化控制器,以控制目标的峰值偏离理想值的程度作为切换判据,设计可以灵活在新型变结构控制和现有变结构控制之间切换的自适应变结构附加控制器,在系统运行工作点没有发生变化或者变化较小时使用新型附加变结构控制器,发生较大变化时自动切换为现有附加变结构控制器。以4机2区域系统为例,仿真结果表明,自适应变结构附加控制器结合了新型变结构和现有变结构控制的优点,具有更好的鲁棒性和控制效果。Based on total least squares-estimation on signal parameters via rotational invariance technique （TLS-ES- PRIT）, the new additional variable structure controller of high voltage direct current （HV DV） system has better control performance than the traditional variable structure controller when there is small or no change at the system working point. However, when a large disturbance is added, which results in the change of system working point, the traditional variable structure controller designed based on real system outperforms the new type controller. In order to optimize the controller further, by taking the extent of the peak value of the control target deviating from the ideal value as a switch- ing criterion, a self-adaptive additional variable structure controller is designed, which can switch between the new and traditional variable structure controllers flexibly. When there is small or no change at the system working point, the new type controller is used ; else, it is automatically switched to the traditional one. With a two-area four-machine system as an example, the simulation result indicates that by combining the advantages of the new and traditional controllers, the self-adaptive variable structure controller has better robustness and control performance.

关 键 词：高压直流 新型变结构控制 切换 自适应 

分 类 号：TM712[电气工程—电力系统及自动化]