论文标题

对配备有相量测量单元的电力系统的州观察:第四阶通量 - 末期模型的情况

State Observation of Power Systems Equipped with Phasor Measurement Units: The Case of Fourth Order Flux-Decay Model

论文作者

Bobtsov, Alexey, Ortega, Romeo, Nikolaev, Nikolay, Schiffer, Johannes, Lorenz-Meyer, M. Nicolai L.

论文摘要

有效利用相量测量单元(PMU)来增强电力系统意识和安全性的问题是一个关键兴趣的话题。要解决的主要问题是如何使用这种新测量结果来重建系统状态。在本文中,我们提供了第一个解决方案,以解决配备PMU并用第四阶通量 - 纽扣模型描述的多支台电力系统(全球收敛性)状态估计的问题。这项工作是我们先前结果的显着扩展,其中解决了更简单的三阶模型,为此,可以为此恢复未知状态的代数部分。不幸的是,该属性在更准确的第四阶模型中丢失,这使状态观察任务显着复杂化。观察者的设计依赖于作者提出的两个最新发展,这是针对状态估计问题的基于参数估计的方法以及动态回归器扩展和混合(DREM)技术的使用来估计这些参数。 DREM的使用使我们能够克服缺乏持续激发的问题,这阻碍了标准参数估计设计的应用。仿真结果说明了后一种事实,并显示了相对于局部稳定的基于梯度的观察者,提出的观察者的性能提高了。

The problem of effective use of Phasor Measurement Units (PMUs) to enhance power systems awareness and security is a topic of key interest. The central question to solve is how to use this new measurements to reconstruct the state of the system. In this paper we provide the first solution to the problem of (globally convergent) state estimation of multimachine power systems equipped with PMUs and described by the fourth order flux-decay model. This work is a significant extension of our previous result, where this problem was solved for the simpler third order model, for which it is possible to recover algebraically part of the unknown state. Unfortunately, this property is lost in the more accurate fourth order model, significantly complicating the state observation task. The design of the observer relies on two recent developments proposed by the authors, a parameter estimation based approach to the problem of state estimation and the use of the Dynamic Regressor Extension and Mixing (DREM) technique to estimate these parameters. The use of DREM allows us to overcome the problem of lack of persistent excitation that stymies the application of standard parameter estimation designs. Simulation results illustrate the latter fact and show the improved performance of the proposed observer with respect to a locally stable gradient-descent based observer.

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