542 research outputs found
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Simulation and Evaluation of Zonal Electricity Market Designs
Zonal pricing with countertrading (a market-based redispatch) gives arbitrage opportunities to the power producers located in the export-constrained nodes. They can increase their profit by increasing the output in the day-ahead market and decrease it in the real-time market (the inc-dec game). We show that this leads to large inefficiencies in a standard zonal market. We also show how the inefficiencies can be significantly mitigated by changing the design of the real-time market. We consider a two-stage game with oligopoly producers, wind-power shocks and real-time shocks. The game is formulated as a two-stage stochastic equilibrium problem with equilibrium constraints (EPEC), which we recast into a two-stage stochastic Mixed-Integer Bilinear Program (MIBLP). We present numerical results for a six-node and the IEEE 24-node system
Microscopic theory for nonequilibrium correlation functions in dense active fluids
One of the key hallmarks of dense active matter in the liquid, supercooled,
and solid phases is so-called equal-time velocity correlations. Crucially,
these correlations can emerge spontaneously, i.e., they require no explicit
alignment interactions, and therefore represent a generic feature of dense
active matter. This indicates that for a meaningful comparison or possible
mapping between active and passive liquids one not only needs to understand
their structural properties, but also the impact of these velocity
correlations. This has already prompted several simulation and theoretical
studies, though they are mostly focused on athermal systems and thus overlook
the effect of translational diffusion. Here we present a fully microscopic
method to calculate nonequilibrium correlations in systems of thermal active
Brownian particles (ABPs). We use the integration through transients (ITT)
formalism together with (active) mode-coupling theory (MCT) and analytically
calculate qualitatively consistent static structure factors and active velocity
correlations. We complement our theoretical results with simulations of both
thermal and athermal ABPs which exemplify the disruptive role that thermal
noise has on velocity correlations
Décontamination des Effluents par les Zeolithes. EUR 3452. = Decontamination of Effluents by Zeolites. EUR 3452.
Dynamical control of quantum state transfer within hybrid open systems
We analyze quantum state-transfer optimization within hybrid open systems,
from a "noisy" (write-in) qubit to its "quiet" counterpart (storage qubit).
Intriguing interplay is revealed between our ability to avoid bath-induced
errors that profoundly depend on the bath-memory time and the limitations
imposed by leakage out of the operational subspace. Counterintuitively, under
no circumstances is the fastest transfer optimal (for a given transfer energy)
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Production efficiency of nodal and zonal pricing in imperfectly competitive electricity markets
Electricity markets employ different congestion management methods to handle the limited transmission capacity of the power system. This paper compares production efficiency and other aspects of nodal and zonal pricing. We consider two types of zonal pricing: zonal pricing with Available Transmission Capacity (ATC) and zonal pricing with Flow-Based Market Coupling (FBMC).We develop a mathematical model to study the imperfect competition under zonal pricing with FBMC. Zonal pricing with FBMC is employed in two stages, a day-ahead market stage and a re-dispatch stage. We show that the optimality conditions and market clearing conditions can be reformulated as a mixed integer linear program (MILP), which is straightforward to implement. Zonal pricing with ATC and nodal pricing is used as our benchmarks. The imperfect competition under zonal pricing with ATC and nodal pricing are also formulated as MILP models. All MILP models are demonstrated on 6-node and the modified IEEE 24-node systems. Our numerical results show that the zonal pricing with ATC results in large production inefficiencies due to the incdec-game. Improving the representation of the transmission network as in the zonal pricing with FBMC mitigates the inc-dec game
clinical impact of whey protein and nutritional counseling in gastrointestinal cancer patients
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