摘要
针对公共直流母线供电的变频调速系统存在恒功率负荷模型失效及不控整流器电流不可逆的情形,采用逆轨迹法,探讨此类系统在受限状态空间内的暂态稳定域边界结构及逼近方法。与现有研究成果构造简化模型的能量函数近似暂态稳定域的方法相比,避免了由逼近方法所引起稳定域边界近似的保守性,可以精确刻画所考虑模型的真实稳定域边界,对研究此类系统的临界故障切除时间以及参数设计提供了准确的暂态稳定域信息。
Considering the precondition of constant power load modeling and the direct current characteristic of uncontrolled rectifiers in frequency control systems supplied by a common dc bus,this paper studies the formation of the boundary of the region of stability in a restricted state space,and adopts the trajectory reversing method to approach it.Compared with the existing methods using energy functions based on simplified models to approximate the region of stability,the method proposed in this paper could exactly determine the real boundary of the region of stability,which precludes the conservativeness brought by the existing methods.This offers the precise information of the region of stability for critical clearing time determination and parameter design of this kind of system.
出处
《电机与控制学报》
EI
CSCD
北大核心
2011年第2期7-12,共6页
Electric Machines and Control
基金
国家自然科学基金(50977047
50907038
50707035)
关键词
变频调速系统
公共直流母线
恒功率负载
逆轨迹法
暂态稳定域
power electronics based system
common DC bus
constant power load
trajectory reversing method
region of stability
