摘要
提出了利用多路广域测量信号作为反馈量的新型电力系统广域阻尼控制(WADC)方法。首先,推导了基于改进Prony算法的动态降阶等值系统参数的辨识方法;利用该辨识方法对受控系统进行辨识,在辨识结果的基础上运用线性二次型方法设计WADC的参数。广域闭环控制必须考虑通信延迟的影响,文中利用线性矩阵不等式方法讨论了控制参数在时滞下的稳定性问题。MATLAB数值仿真验证了辨识方法的准确性。WADC的控制效果在36节点的多机系统中得到了仿真验证。结果证明,应用广域信号作为反馈的WADC可以更有效地阻尼区间低频振荡,同时提高了联络线的传送容量极限。
A new wide-area damping control (WADC) scheme based on wide-area measurements and online system identification is proposed. The identification method applied to single-input-multi-output system is presented. By using an improved Prony algorithm, it can obtain the reduced-order state equation model of the concerned system from the output responses. Parameters of the WADC are designed with linear quadratic (LQ) method in the identified model. The communication delay is then considered in the resulted close-loop control system, and the local maximum guarded-delay is derived by solving a linear matrix inequality (LMI). Finally, MATLAB simulation validates the accuracy of the system identification method and simulation results with a 36-node power system demonstrate the effectiveness of the proposed wide-area damping control scheme.
出处
《电力系统自动化》
EI
CSCD
北大核心
2004年第23期22-27,共6页
Automation of Electric Power Systems
基金
国家自然科学基金资助项目(50323002
50407001)
关键词
广域测量系统
在线辨识
广域阻尼控制
线性矩阵不等式
通信延时
wide-area measurement system
online identification
wide-area damping control (WADC)
linear matrix inequality (LMI)
communication delay
