多机电力系统无源化反步控制研究

Passivity-based backstepping control for multi-machine power system

随着国内外电力工业改革和互联电网的发展,电力系统的安全性、可靠性、稳定性、经济性就显得尤为重要。研究表明,发电机组的励磁控制对于提高电力系统的暂态稳定性起着至关重要的作用,本文针对多机电力系统励磁控制模型,考虑到系统的多变量、强耦合、非线性等特性,设计使系统渐近稳定的无源化控制器。无源性和稳定性是密切相关的,系统无源可以保持其内部稳定。该方案物理意义明确,能有效简化控制器的结构,提高系统鲁棒性。对三相可恢复故障和三相永久性故障的仿真结果表明了所设计的控制器的有效性。

With the development of interconnected power system and the reform of power industry in the worldwide, it is particularly important concerning the security, reliability stability and the economy of the power system. Investigations have shown that suitable excitation control method, as an effective and economic measure, can play an im- portant role to ensure the transient stability of the power system. Based on multi-machine excitation control models, considering the variables and strong coupling characteristics of the system, passivity control schemes aimed at en- hancing power system stability are proposed in this paper. Passivity and stability are closely related, the system can be passive so as to maintain its internal stability. The schemes which improve system robustness and simplify structure of the controller effectively have well-defined. The simulation result shows the validity of the controller.