基于WAMS的交直流并联输电系统模型辨识算法  

Model Identification in AC/DC Parallel Transmission System Based on WAMS

作　　者：陈树恒[1] 李兴源[1] 

机构地区：[1]四川大学电气信息学院,四川省成都市610065

出　　处：《中国电机工程学报》2008年第4期48-53,共6页Proceedings of the CSEE

基　　金：国家自然科学基金项目(50595412;50577044)~~

摘　　要：在线辨识交直流并联输电系统模型是进行HVDC广域阻尼控制的前提。该文提出一种利用有限长广域测量数据在线辨识交直流并联输电系统模型的方法。假设系统为单输入、多输出模型,推导了交直流并联输电系统模型辨识理论,并以此为基础,用AR过程理论推导了Prony信号模型参数辨识的算法及计算过程时间消耗的计算公式;采用同步相量测量单元(phasor measurement unit,PMU)的GPS时钟准确计算了数据传输延时;在基于广域测量系统(wide area measurement system,WAMS)的调度自动化系统中,将计算事务分布实现,进一步提高了系统模型辨识速度。以南方电网中的贵广交直流并联输电系统为算例,证明了该算法的有效性与可靠性。Identifying the model of AC/DC parallel transmission system on line is the precondition for realizing HVDC wide-area damp control. A method of identifying AC/DC parallel transmission system＇s model on line by WAMS data with limited length is put forward. Supposed that it＇s a SIMO system, the theory of identifying AC/DC parallel transmission system model is analyzed. Based on the theory, the arithmetic of identifying the Prony model＇s parameters and the formula of calculating the time spent on the process are deduced with the theory of AR model. The time relayed on transmission in communication net is calculated by using the GPS clock of PMU. The process of identifying the HVDC model is speeded up more due to the distributed realization of all the arithmetic＇s steps in WAMS center. The research about Gui-Guang HVDC line in South Power has proved that the method is valid and reliable.

关 键 词：低频振荡 状态空间表达式 Prony模型 交直流并联输电系统 广域测量系统 

分 类 号：TM74[电气工程—电力系统及自动化]