Abstract
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.
Original language | English (US) |
---|---|
Article number | 6740090 |
Pages (from-to) | 2281-2291 |
Number of pages | 11 |
Journal | IEEE Transactions on Power Systems |
Volume | 29 |
Issue number | 5 |
DOIs | |
State | Published - Sep 2014 |
Externally published | Yes |
Keywords
- Alternating direction method of multipliers
- inter-area modes
- sparsity-promoting control
- wide-area control
ASJC Scopus subject areas
- Energy Engineering and Power Technology
- Electrical and Electronic Engineering