考虑时滞的广域电力系统阻尼控制

发布时间：2018-05-12 13:32

本文选题：低频振荡 + 阻尼控制　；参考：《华北电力大学》2017年硕士论文

【摘要】：随着电力工业与信息工业的深度融合与“互联网+”概念的提出,开发网络化、数字化、智能化等技术,利用广域测量系统反馈信号中的广域信息实现对电力系统的控制,能有效抑制低频振荡,提高互联电网系统的动态性能,已成为未来电网的发展趋势。然而,广域信号采集传输过程中存在不可忽略的多路传输延迟,且具有时变性的本质,深入考虑电力系统控制中的时滞环节对优化控制器性能与提高电力系统的安全稳定运行具有促进作用。本文首先建立考虑多路信号传输时滞的电力系统模型,利用Pade近似时滞推导出计及多路信号时滞以及多个控制器时的闭环电力系统状态空间方程。在此基础上,通过特征值分析和时域仿真对比分析多路信号时滞以及时变时滞对电力系统稳定性的影响。其次,针对考虑多路信号延迟的电力系统阻尼控制的研究不足以及鲁棒控制方法无法直接求取控制参数的缺陷,提出一种可直接求解控制参数的多时滞广域电力系统阻尼控制器的设计方法,利用Lyapunov-Krasovskii泛函理论推导出的多时滞系统镇定判据,将控制镇定问题转化为线性矩阵不等式的可行性问题,直接求解控制参数,避免了传统方法中利用智能算法迭代求解参数的不便。最后,利用网络化控制系统的思想,对电力系统的时变时滞和丢包采用实时估测和统一化处理,并设计一种利用自适应史密斯预估器以克服广域传输信号时变和丢包的影响。本文所提的两种控制方案均结合相关案例进行仿真验证。本文研究内容有利于理解多路传输延迟以及时变传输延迟对电力系统的影响,并在计及多时滞以及时变时滞的电力系统阻尼控制器设计领域做出有益尝试,具有一定的理论意义和实用价值。
[Abstract]:With the deep integration of power industry and information industry and the concept of "Internet", the development of networking, digitization, intelligence and other technologies, using the wide area information in the feedback signal of the wide area measurement system to realize the control of the power system. It has become the development trend of power grid in the future to restrain the low frequency oscillation effectively and improve the dynamic performance of interconnected power system. However, in the process of wide-area signal acquisition and transmission, there is a delay in multichannel transmission, which is time-varying in nature. Considering the time delay in power system control, it is helpful to optimize the performance of controller and improve the safe and stable operation of power system. In this paper, a power system model with multiple signal transmission delays is established, and the state space equation of the closed loop power system is derived by using the Pade approximate delay. On this basis, the effects of multi-channel delay and time-varying delay on the stability of power system are analyzed by eigenvalue analysis and time-domain simulation. Secondly, aiming at the lack of research on damping control of power system considering multi-channel signal delay, and the defect that robust control method can not directly obtain control parameters, In this paper, a design method of damping controller for wide area power system with multiple delays is presented, which can directly solve the control parameters. The stabilization criterion for multi time delay systems is derived by using Lyapunov-Krasovskii functional theory. The control stabilization problem is transformed into the feasibility problem of linear matrix inequality (LMI), and the control parameters are solved directly, which avoids the inconvenience of using the intelligent algorithm to solve the parameters iteratively in the traditional methods. Finally, using the idea of networked control system, real-time estimation and unified processing of time-varying delay and packet loss in power system are adopted, and an adaptive Smith predictor is designed to overcome the influence of time-varying and packet loss of wide-area transmission signals. The two control schemes proposed in this paper are verified by simulation combined with relevant cases. The research in this paper is helpful to understand the influence of multiple transmission delay and time-varying transmission delay on power system, and a useful attempt is made in the field of design of damping controller for power system with multi-delay and time-varying delay. It has certain theoretical significance and practical value.
【学位授予单位】：华北电力大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TM712

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