A Measurement-Based Framework for Dynamic Equivalencing of Large Power Systems Using Wide-Area Phasor Measurements

Chakrabortty, Aranya; Chow, Joe H.; Salazar, Armando

doi:10.1109/tsg.2010.2093586

Cited by 135 publications

(82 citation statements)

References 14 publications

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“…In this letter, we derive all these reductions to a two-bus equivalent in common framework so that their assumptions and objectives can be explained and compared. In addition, we show a new reduction that preserves the complex powers entering the corridor, which has some similarities to the reduction proposed by [5].…”

Section: Introductionmentioning

confidence: 54%

On Two-Bus Equivalents of Transmission Corridors

Vournas

Ramirez

Dobson

2016

IEEE Trans. Power Syst.

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Section: Introductionmentioning

confidence: 54%

On Two-Bus Equivalents of Transmission Corridors

Vournas

Ramirez

Dobson

2016

IEEE Trans. Power Syst.

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“…Thus, the precise model (2) of a bulk power system may not be known system-wide, or it may be known only with a limited accuracy. We discuss related robustness issues in Subsection II-F. As discussed in Section I, the model (2) can also be estimated online using subspace identification methods [21]- [23], identification of aggregated models [20], or adaptive Kalman filtering methods [16].…”

Section: Problem Setup and Theoretical Frameworkmentioning

confidence: 99%

“…Known time delays can be incorporated into the control design, for example, via linear matrix inequalities [6], [17] or predictor-based design [19]. Unknown time constants can be treated using linear parameter-varying systems [13] or online identification of parameters [16], aggregated models [20], or non-parameterized models [21]- [23]. Unknown delays, communication uncertainties, and uncertain time constants can be incorporated into a robust control synthesis using (un)structured uncertainties and robustness margins [24].…”

Section: Introductionmentioning

confidence: 99%

Sparsity-Promoting Optimal Wide-Area Control of Power Networks

Dörfler

Jovanović

Chertkov

et al. 2014

IEEE Trans. Power Syst.

198

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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 widearea 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 sparsitypromoting 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 1-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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“…• In smart power grid, researchers have i) developed models based on measurement from phaser measurement units to solve the wide area control problem of large-scale power systems [6], [7], [8], ii) investigated the integration of renewable energy into power grid [9,14,16,17,27], and iii) optimized the packing size of large scale batteries to improve battery utilization in microgrids [11]. Our work builds on previous works, but concentrates on minimizing on minimizing energy sharing loss over DC line at the small community level.…”

Section: Related Workmentioning

confidence: 99%

Sharing renewable energy in smart microgrids

Zhu

Huang

Sharma

et al. 2013

Proceedings of the ACM/IEEE 4th International Conference on Cyber-Physical Systems

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Renewable energy harvested from the environment is an attractive option for providing green energy to homes. Unfortunately, the intermittent nature of renewable energy results in a mismatch between when these sources generate energy and when homes demand it. This mismatch reduces the efficiency of using harvested energy by either i) requiring batteries to store surplus energy, which typically incurs ∼20% energy conversion losses; or ii) using net metering to transmit surplus energy via the electric grid's AC lines, which severely limits the maximum percentage of possible renewable penetration. In this paper, we propose an alternative structure wherein nearby homes explicitly share energy with each other to balance local energy harvesting and demand in microgrids. We develop a novel energy sharing approach to determine which homes should share energy, and when, to minimize system-wide efficiency losses. We evaluate our approach in simulation using real traces of solar energy harvesting and home consumption data from a deployment in Amherst, MA. We show that our system i) reduces the energy loss on the AC line by 60% without requiring large batteries, ii) scales up performance with larger battery capacities, and iii) is robust to changes in microgrid topology.

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A Measurement-Based Framework for Dynamic Equivalencing of Large Power Systems Using Wide-Area Phasor Measurements

Cited by 135 publications

References 14 publications

On Two-Bus Equivalents of Transmission Corridors

On Two-Bus Equivalents of Transmission Corridors

Sparsity-Promoting Optimal Wide-Area Control of Power Networks

Sharing renewable energy in smart microgrids

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