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arXiv 1307.4342math.OC
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提高稀疏度的电力网络广域最优控制

Sparsity-Promoting Optimal Wide-Area Control of Power Networks

Florian Dörfler, Mihailo R. Jovanovic, Michael Chertkov, Francesco Bullo

摘要:

大容量电力系统中的区域间振荡通常难以通过局部分散控制来控制。最近的研究努力已经旨在开发涉及远程信号通信的广域控制策略。在传统的广域控制中,控制结构通常基于模态准则先验地固定。相比之下,在这里,我们采用最近引入的稀疏促进最优控制的范例,同时确定的最优控制结构和优化的闭环性能。为了诱导一个稀疏的控制架构,我们正则化的标准二次性能指标的反馈矩阵上的l1-惩罚。二次型目标函数受经典慢相干理论的启发,旨在模拟无区域间振荡的同类网络。我们使用新英格兰电网模型来证明,所提出的稀疏性促进控制设计与慢相干性目标的组合执行几乎以及最佳集中控制,同时只利用一个单一的广域通信链路。除了这个标称性能,我们还证明了我们的控制策略产生有利的鲁棒性利润,它可以用来确定一个稀疏的控制结构,通过替代手段的控制设计。

英文摘要:

Inter-area oscillations in bulk power systems are typically poorly controllable by means of local decentralized control. Recent research efforts have been aimed at developing wide- area control strategies that involve communication of remote signals. In conventional wide-area control, the control structure is fixed a priori typically based on modal criteria. In contrast, here we employ the recently-introduced paradigm of sparsity- promoting optimal control to simultaneously identify the optimal control structure and optimize the closed-loop performance. To induce a sparse control architecture, we regularize the standard quadratic performance index with an l1-penalty on the feedback matrix. The quadratic objective functions are inspired by the classic slow coherency theory and are aimed at imitating homogeneous networks without inter-area oscillations. We use the New England power grid model to demonstrate that the proposed combination of the sparsity-promoting control design with the slow coherency objectives performs almost as well as the optimal centralized control while only making use of a single wide-area communication link. In addition to this nominal performance, we also demonstrate that our control strategy yields favorable robustness margins and that it can be used to identify a sparse control architecture for control design via alternative means.

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